G-37S Coupe vs. 335IS Coupe
08-21-2012, 01:05 PM
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G-37S Coupe vs. 335IS Coupe
Interesting morning. Was going home after dropping my granddaughter at the movies when a black G37S Coupe with blacked out windows & custom wheels started to cut through traffic to get next to me. He then gave a few punches on his gas to rock his car a bit. I shifted into manual full sport with traction off. Dropped gears till I was at 5K RPM this is just before the horsepower & torque curves cross on my dyno sheets so the car is generating about 335whp and climbing with a flat 360lb-wtq at this point.
I let him make the start. Was fully clear of him & pulling hard before the tach reached 6K & my first shift at 6250rpm. Three more goes of the same type & he decided it was not even close to being his day & turned off into a side street. I think his car was a 6MT because it reacted quickly to his throttle inputs when he was bouncing around issuing a challenge
Thought I would post a picture the sum total of my $1100 in mods, a JB4 & a larger FMIC. The thing I really like about the JB4 is the constant free updates coming from Terry especially those specifically designed for the N54IS engines.
I let him make the start. Was fully clear of him & pulling hard before the tach reached 6K & my first shift at 6250rpm. Three more goes of the same type & he decided it was not even close to being his day & turned off into a side street. I think his car was a 6MT because it reacted quickly to his throttle inputs when he was bouncing around issuing a challenge
Thought I would post a picture the sum total of my $1100 in mods, a JB4 & a larger FMIC. The thing I really like about the JB4 is the constant free updates coming from Terry especially those specifically designed for the N54IS engines.
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08-21-2012, 01:59 PM
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Thanks for the kind words,
Going back as far as chassis dynos were available to the general public I always tried to get some pulls with any car that was performance oriented after major changes to measure against a pure stock baseline run. Without the charts shifting & RPM management is just guess work. With the 335’s lots of guys want to ride it out to the 7K red line, but all the curves from stock to FBO with stock turbos show a steep WHP dive over 6500rpm.
Attached both my baseline & an old Map2 run that I have on this computer, you can see the curves are pretty much the same & just the output numbers change.
I now run a custom 335IS Map 6 with a mix of 93 octane + either 100 octane race gas or a 30% mix of E85. Hope to dyno it when it cools down.
I have my shift lights set for 6250 so that with my & the cars reaction times the shift is done around 6500rpm & the engine falls back into the meat of the WHP range.
Learned the lesson in 1966 when my GTO Tri-Power Ram Air got thumped by a 350HP 327ci Chevelle on the NJTP. I had just re-cammed with a few other things & was in the wrong gear & wrong rpm when the end carbs opened. Car went into terminal bog & the Chevy was gone.
Going back as far as chassis dynos were available to the general public I always tried to get some pulls with any car that was performance oriented after major changes to measure against a pure stock baseline run. Without the charts shifting & RPM management is just guess work. With the 335’s lots of guys want to ride it out to the 7K red line, but all the curves from stock to FBO with stock turbos show a steep WHP dive over 6500rpm.
Attached both my baseline & an old Map2 run that I have on this computer, you can see the curves are pretty much the same & just the output numbers change.
I now run a custom 335IS Map 6 with a mix of 93 octane + either 100 octane race gas or a 30% mix of E85. Hope to dyno it when it cools down.
I have my shift lights set for 6250 so that with my & the cars reaction times the shift is done around 6500rpm & the engine falls back into the meat of the WHP range.
Learned the lesson in 1966 when my GTO Tri-Power Ram Air got thumped by a 350HP 327ci Chevelle on the NJTP. I had just re-cammed with a few other things & was in the wrong gear & wrong rpm when the end carbs opened. Car went into terminal bog & the Chevy was gone.
08-22-2012, 05:23 PM
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The way he was jumping up & back I think he really just wanted to see if the old guy would go. The small Burger Motor Sports decals in the rear quarter windows should have tipped him it had a bit extra. 
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08-23-2012, 09:36 PM
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No plans for catless downpipes since they will not pass the NC state emissions test. At my current boost levels, 17psi max, I am giving up about 20whp by not using them but still have around 380whp with the new “IS” Maps & either a 35% race gas or 30% E85 mix in 93 octane premium. E-85 is a lot less expensive then 100 octane which is $7.75 at the pump. There does not seem to be any real performance difference between race gas & E-85 mix but am concerned about fuel system corrosion with the ethanol. .
Traction with the rear 265/30/19 street tires is the cars limiting factor & I occasionally use a 2nd gear start or cut boost in 1st gear to 11psi if I think I need a hard launch at the track. Otherwise on the street I just feather the throttle in 1st to where the tires will hold. I don’t really like to use the launch control system so I have never practiced with it.
I am about 60/70whp short of the faster cars, all the way back on page 7 at Drag Times, but its my DD so its as far as I want to take it.
Last edited by BEAR-AvHistory; 08-23-2012 at 09:40 PM.
08-27-2012, 06:52 PM
#9
Burning Brakes
You really need to calculate the ideal shift points using rwhp and the torque multiplication of each gear. For many cars, the ideal shift point isn't the same for each successive gear and sometimes the ideal shift point in the lower gears occurs well after peak power. Seeing that your motor making basically the same power from 5700rpms to 6700rpms, I'd certainly not shift ANY sooner than an 6700rpms so that the shift hits right before the power starts tailing off. You want to make damn sure you're riding the meat of the power. Shifting at 6500rpms is selling your car's performance short especially in the upper gears. I'd shift the 1-2 at close 6900rpms and all the others at 6700rpms.
08-27-2012, 07:03 PM
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Thing is all the record holding stock turbo 335's shift between 6000 & 6250. The RB turbos will shift slightly higher & the big 600whp singles will run to redline. Beside the torque multiplication math you need to also consider the elapsed time for the revs to go from 6000 to 7000rpm. That some what slow progression in gaining revs more then offsets any loss in torque multiplication by not running to redline. The stock turbos are pretty much done in by 6K
Last edited by BEAR-AvHistory; 08-27-2012 at 07:15 PM.
08-27-2012, 07:53 PM
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http://www.dragtimes.com/2007-BMW-33...phs-22767.html
This is Terry Burgers (owner of JB4 manufacturing company) development car driven by one of the guys on a record run for stock turbos no-N2O. Car is auto & all shifts are made on 6K shift lights. Terry has dialed in my setup & 6/6.2K.
One of the nice things about the JB4 is its ability to generate logs, pic attached, in excel CSV files during runs that enable them to dial in specific cars to the local conditions & available fuel. Mine is setup for either at 33% 100 octane race fuel & 67% 93 octane premium or 30% E-85 & 70% 93 octane premium.
BTW The factory default JB4 shift light setting is 6K
This is Terry Burgers (owner of JB4 manufacturing company) development car driven by one of the guys on a record run for stock turbos no-N2O. Car is auto & all shifts are made on 6K shift lights. Terry has dialed in my setup & 6/6.2K.
One of the nice things about the JB4 is its ability to generate logs, pic attached, in excel CSV files during runs that enable them to dial in specific cars to the local conditions & available fuel. Mine is setup for either at 33% 100 octane race fuel & 67% 93 octane premium or 30% E-85 & 70% 93 octane premium.
BTW The factory default JB4 shift light setting is 6K
Last edited by BEAR-AvHistory; 08-27-2012 at 07:56 PM.
08-27-2012, 08:11 PM
#12
Yes the "IS" has a bi-turbo N-54. The Z4IS & 1M all have this motor. The rest of the 3.0 turbos in the BMW line are N55’s.
No plans for catless downpipes since they will not pass the NC state emissions test. At my current boost levels, 17psi max, I am giving up about 20whp by not using them but still have around 380whp with the new “IS” Maps & either a 35% race gas or 30% E85 mix in 93 octane premium. E-85 is a lot less expensive then 100 octane which is $7.75 at the pump. There does not seem to be any real performance difference between race gas & E-85 mix but am concerned about fuel system corrosion with the ethanol. .
Traction with the rear 265/30/19 street tires is the cars limiting factor & I occasionally use a 2nd gear start or cut boost in 1st gear to 11psi if I think I need a hard launch at the track. Otherwise on the street I just feather the throttle in 1st to where the tires will hold. I don’t really like to use the launch control system so I have never practiced with it.
I am about 60/70whp short of the faster cars, all the way back on page 7 at Drag Times, but its my DD so its as far as I want to take it.
No plans for catless downpipes since they will not pass the NC state emissions test. At my current boost levels, 17psi max, I am giving up about 20whp by not using them but still have around 380whp with the new “IS” Maps & either a 35% race gas or 30% E85 mix in 93 octane premium. E-85 is a lot less expensive then 100 octane which is $7.75 at the pump. There does not seem to be any real performance difference between race gas & E-85 mix but am concerned about fuel system corrosion with the ethanol. .
Traction with the rear 265/30/19 street tires is the cars limiting factor & I occasionally use a 2nd gear start or cut boost in 1st gear to 11psi if I think I need a hard launch at the track. Otherwise on the street I just feather the throttle in 1st to where the tires will hold. I don’t really like to use the launch control system so I have never practiced with it.
I am about 60/70whp short of the faster cars, all the way back on page 7 at Drag Times, but its my DD so its as far as I want to take it.
08-31-2012, 04:05 PM
#13
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Finally got the FMIC that has been sitting on the garage floor all summer (DUH) installed. Will run some dynos as soon as the weather settles into the 70's to compare with my pure stock 319whp baseline from last year.
08-31-2012, 04:22 PM
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Am doing some logs this weekend but they only apply to cars running the JB4.
09-01-2012, 12:05 PM
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At first when he was chasing me down through traffic I thought he figured just another 328 to thump. Then when he tried to go even after seeing the IS markings & Burger JB4 sticker I thought he just wanted to see it go. When he came back for another go it left me clueless as to what he was thinking.
Was definitely a car that would make a run, all black with very dark tint, lowered & custom wheels. I know there are a lot of DD’s faster then mine, met some at the track, but its pretty quick on the street because the full 17psi boost that comes in under 2K.
That being said the car is pretty much a sleeper if you don't know BMW's very well. No flaps, scoops or wings, just a plain coupe. The three openings in the front valance are functional. Center FMIC, ends Oil Cooler in one & a secondary coolant radiator in the other but they are not easy to see with a casual look.
Was definitely a car that would make a run, all black with very dark tint, lowered & custom wheels. I know there are a lot of DD’s faster then mine, met some at the track, but its pretty quick on the street because the full 17psi boost that comes in under 2K.
That being said the car is pretty much a sleeper if you don't know BMW's very well. No flaps, scoops or wings, just a plain coupe. The three openings in the front valance are functional. Center FMIC, ends Oil Cooler in one & a secondary coolant radiator in the other but they are not easy to see with a casual look.
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Yonkersracing (11-24-2012)
11-25-2012, 10:18 AM
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11-29-2012, 04:30 PM
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I meant a stock 335i. A stock 335is will dyno at 319whp & 360wtq running in the range of 13.1/13.3 @ 108/109mph which is a bit too much for the G-37.
I would have liked to seen the 348BHP G-37 IPL Coupe come it a good bit lighter. I test drove it when I was looking at the cars liked it very much & would have bought it had a bit more power or a turbo.
My final 3 was a weird collection, the 335IS, G37IPL & the Corvette Grand Sport.
I would have liked to seen the 348BHP G-37 IPL Coupe come it a good bit lighter. I test drove it when I was looking at the cars liked it very much & would have bought it had a bit more power or a turbo.
My final 3 was a weird collection, the 335IS, G37IPL & the Corvette Grand Sport.
11-30-2012, 04:48 PM
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I meant a stock 335i. A stock 335is will dyno at 319whp & 360wtq running in the range of 13.1/13.3 @ 108/109mph which is a bit too much for the G-37.
I would have liked to seen the 348BHP G-37 IPL Coupe come it a good bit lighter. I test drove it when I was looking at the cars liked it very much & would have bought it had a bit more power or a turbo.
My final 3 was a weird collection, the 335IS, G37IPL & the Corvette Grand Sport.
I would have liked to seen the 348BHP G-37 IPL Coupe come it a good bit lighter. I test drove it when I was looking at the cars liked it very much & would have bought it had a bit more power or a turbo.
My final 3 was a weird collection, the 335IS, G37IPL & the Corvette Grand Sport.
Did you happen to check out the M3?
11-30-2012, 05:37 PM
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Yes I drove one for a weekend. Did not think with the revs needed to get it into its comfort zone it would be a good DD. That being said all things being equal I will most likely get a turbo M3 coupe when they are released.
12-01-2012, 12:08 PM
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The fuel pump thing was solved back in 2010 & was a very big issue. BMW stepped up & extended the warranty on the pump out past the 50K mile standard & the turbos are also covered out to 83K miles.
14K miles so far - 12K on the JB4 & 1 free oil change with another due now. Unlike some reports here I have had good luck with BMW.
My oldest a 2004 330Ci ZPH 6 MT has over 100K miles & has outside of tires cost me about $1500 out of pocket. 4 O2 sensors, some smog parts, valve cover gasket & a few sets of pads & rotors.
The X3 is still on the free plan & has had nothing outside of oil changes etc, no warranty work has been required.
14K miles so far - 12K on the JB4 & 1 free oil change with another due now. Unlike some reports here I have had good luck with BMW.
My oldest a 2004 330Ci ZPH 6 MT has over 100K miles & has outside of tires cost me about $1500 out of pocket. 4 O2 sensors, some smog parts, valve cover gasket & a few sets of pads & rotors.
The X3 is still on the free plan & has had nothing outside of oil changes etc, no warranty work has been required.
12-17-2012, 01:30 PM
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12-22-2012, 03:01 PM
#31
Yes the "IS" has a bi-turbo N-54. The Z4IS & 1M all have this motor. The rest of the 3.0 turbos in the BMW line are N55’s.
No plans for catless downpipes since they will not pass the NC state emissions test. At my current boost levels, 17psi max, I am giving up about 20whp by not using them but still have around 380whp with the new “IS” Maps & either a 35% race gas or 30% E85 mix in 93 octane premium. E-85 is a lot less expensive then 100 octane which is $7.75 at the pump. There does not seem to be any real performance difference between race gas & E-85 mix but am concerned about fuel system corrosion with the ethanol. .
Traction with the rear 265/30/19 street tires is the cars limiting factor & I occasionally use a 2nd gear start or cut boost in 1st gear to 11psi if I think I need a hard launch at the track. Otherwise on the street I just feather the throttle in 1st to where the tires will hold. I don’t really like to use the launch control system so I have never practiced with it.
I am about 60/70whp short of the faster cars, all the way back on page 7 at Drag Times, but its my DD so its as far as I want to take it.
No plans for catless downpipes since they will not pass the NC state emissions test. At my current boost levels, 17psi max, I am giving up about 20whp by not using them but still have around 380whp with the new “IS” Maps & either a 35% race gas or 30% E85 mix in 93 octane premium. E-85 is a lot less expensive then 100 octane which is $7.75 at the pump. There does not seem to be any real performance difference between race gas & E-85 mix but am concerned about fuel system corrosion with the ethanol. .
Traction with the rear 265/30/19 street tires is the cars limiting factor & I occasionally use a 2nd gear start or cut boost in 1st gear to 11psi if I think I need a hard launch at the track. Otherwise on the street I just feather the throttle in 1st to where the tires will hold. I don’t really like to use the launch control system so I have never practiced with it.
I am about 60/70whp short of the faster cars, all the way back on page 7 at Drag Times, but its my DD so its as far as I want to take it.
12-22-2012, 04:44 PM
#32
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E85 station is about as far away as the 100 station, but the 100 is all highway while the E85 is all downtown city streets.
Its an easier drive to gedt 100 + I prefer running a custom fixed map as opposed to an auto learning map on the JB4.
Its an easier drive to gedt 100 + I prefer running a custom fixed map as opposed to an auto learning map on the JB4.
12-27-2012, 03:08 PM
#33
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New G37S Convertible non race story
I am pulling up to a traffic light at an intersection that has 3 lanes in each direction + turn lanes. A G37S convert is in the middle lane the fast lane is empty & I pull into the curb lane because I will be making a right just up the road onto the expressway. Guy is in mid 30's or so & looking over so figured he might jump & I shifted to 2nd while waiting for the light.
This is at a mall so the cross street always has heavy traffic turning right onto the street we are on & typically they run over into our green light.
Light turns green, there are 3 cars in various stages of turning right blocking my lane & his lane plus most of the fast lane, the guy punches it turns hard left into the oncoming turn lane whips back past all the turning cars then slows down to under the speed limit with no one in front of him. I come up at the limit & he drops back behind me till I turn off. He kept going & did not turn onto the expressway.
Still trying to figure out what was going on, why risk a head-on in a turn lane only to pull back in, go slow & pull in behind of me?
I am pulling up to a traffic light at an intersection that has 3 lanes in each direction + turn lanes. A G37S convert is in the middle lane the fast lane is empty & I pull into the curb lane because I will be making a right just up the road onto the expressway. Guy is in mid 30's or so & looking over so figured he might jump & I shifted to 2nd while waiting for the light.
This is at a mall so the cross street always has heavy traffic turning right onto the street we are on & typically they run over into our green light.
Light turns green, there are 3 cars in various stages of turning right blocking my lane & his lane plus most of the fast lane, the guy punches it turns hard left into the oncoming turn lane whips back past all the turning cars then slows down to under the speed limit with no one in front of him. I come up at the limit & he drops back behind me till I turn off. He kept going & did not turn onto the expressway.
Still trying to figure out what was going on, why risk a head-on in a turn lane only to pull back in, go slow & pull in behind of me?
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