Who makes J-pipes and what's the power/price?
02-08-2011, 12:01 PM
#82
Suzuka Master
iTrader: (2)
Desmond or Des (see sig). Thank you for the kind words. I don't have this set-up yet but from reading th stats each vendor was nice enough to post, I've made my decision easier.
This is going to get touchy when I state this or maybe not but pick the intake (SRI/CAI) on where you want to gain most the power.
Here is what I mean. I bought the TL for its smooth powerband. Not to go out street racing at Wednesday nights local rice fest like my cars previous.
Where the TL is lacking (3.2) is low-end/off the line power which the J-pipe helps. A CAI helps here too where most power is made low rpm to mid-range the starts to taper off thereafter where as SRI doesn't make much off the line due to heatsoak mostly and builds from mid-range to top-end. This is why the Takeda CAI only makes 7hp peak vs. 14hp for SRI but both yield the same 14ft/lbs tq. More than that is the dyno curves prove this hypothesis to be correct.
The J32/35 has no problem making top-end power after the motor begins "spraying" VTEC in that whale of glory sound honda engines are known for.
But i digress...
For the money if you're on a budget, you're better off buying one of these vender's j-pipes vs. an exhaust.
This is going to get touchy when I state this or maybe not but pick the intake (SRI/CAI) on where you want to gain most the power.
Here is what I mean. I bought the TL for its smooth powerband. Not to go out street racing at Wednesday nights local rice fest like my cars previous.
Where the TL is lacking (3.2) is low-end/off the line power which the J-pipe helps. A CAI helps here too where most power is made low rpm to mid-range the starts to taper off thereafter where as SRI doesn't make much off the line due to heatsoak mostly and builds from mid-range to top-end. This is why the Takeda CAI only makes 7hp peak vs. 14hp for SRI but both yield the same 14ft/lbs tq. More than that is the dyno curves prove this hypothesis to be correct.
The J32/35 has no problem making top-end power after the motor begins "spraying" VTEC in that whale of glory sound honda engines are known for.
But i digress...
For the money if you're on a budget, you're better off buying one of these vender's j-pipes vs. an exhaust.
02-09-2011, 12:24 PM
#84
2007 TL Type-S NBP
Join Date: Jan 2011
Location: Rexburg, Idaho
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What impact will PCD's and J-pipe installation have on gas mileage/mpg? I would think that under normal, not floored, driving conditions the fuel economy would improve. Has anyone noticed a before and after difference?
02-10-2011, 07:05 PM
#88
2007 TL Type-S NBP
Join Date: Jan 2011
Location: Rexburg, Idaho
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I'm aware of the theoretical efficiency increase producing a mpg improvement but I want to know if anyone has actually seen it in real life. Ideally I'd like to hear from the person who commutes thirty miles each way to work and used to see 24mpg, swapped in PCD and j-pipe and now sees 25mpg. Anyone out there actually see a real world difference in mpg?
02-10-2011, 08:46 PM
#89
Suzuka Master
iTrader: (2)
Take it with a grain of salt, but my mileage indicator remained the same after adding exhaust, pulley and catback, then increased by one mpg after installing the J pipe and third cat delete.
02-10-2011, 09:25 PM
#90
Banned
Thread Starter
I would as well... It'll be hard to be scientific about it though.
02-11-2011, 12:48 AM
#91
2007 TL Type-S NBP
Join Date: Jan 2011
Location: Rexburg, Idaho
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Thanks, anx1300c, that's the kind of real life experience I'm looking for. Of course none of us has the time to do extensive scientific tests before and after to verify but many of us track our mileage on every fill up and know what we usually see. I'd be happy enough with no mpg increase as long as I get another 20hp and no loss of fuel economy! 
02-11-2011, 01:00 AM
#92
Banned
Thread Starter
Thanks, anx1300c, that's the kind of real life experience I'm looking for. Of course none of us has the time to do extensive scientific tests before and after to verify but many of us track our mileage on every fill up and know what we usually see. I'd be happy enough with no mpg increase as long as I get another 20hp and no loss of fuel economy!
02-16-2011, 02:39 AM
#95
Banned
Thread Starter
02-16-2011, 02:44 AM
#96
Banned
Thread Starter
Yes. how? The hp/tq lines cross at 5250rpm as they should. What do you find bogus? I was just saying i could not follow R-V6's dyno. is all. Just wanted clarity. Never claimed they were "bogus". That would be calling him a liar. Very rude of me or anyone else to do. Sorry for the late response. I just saw it.
02-16-2011, 02:46 AM
#97
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Thread Starter
02-16-2011, 12:51 PM
#98
Suzuka Master
iTrader: (2)
Yes. how? The hp/tq lines cross at 5250rpm as they should. What do you find bogus? I was just saying i could not follow R-V6's dyno. is all. Just wanted clarity. Never claimed they were "bogus". That would be calling him a liar. Very rude of me or anyone else to do. Sorry for the late response. I just saw it.
First off, nowhere on that "dyno" does anything cross at 5250. You've got a mess of blurry numbers on the bottom with no rhyme or reason. It's supposed to be a linear chart, yet at each graph the "RPM's" increase anywhere from 300-500, which is bogus as hell.
The "before" numbers which we'll logically assume to be represented by the solid line, cross under 5k and show peak horsepower of about 187, which a 3G TL could probably put down on five cylinders. Then, if you zoom in on the chart and really squint, you'll see the "after" numbers cross dead center between 5100 and 5650, which works out to be 5375, not 5250.
So, after the install of this magic intake, we're now making a whopping 200 whp, which is still well under what a stock 3G should be making.
The chart is not keyed, it doesn't show any a/f numbers, it shows no indication of the brand of dyno used, etc etc.
You would probably benefit from studying some real dyno charts for this car!
Here's a legit Dynojet dyno, done by Temple of Vtec on an '04 TL manual.
http://www.vtec.net/forums/one-messa...sage_id=193390
02-22-2011, 11:47 PM
#100
Banned
Thread Starter
No but the manufacturers posted their gains with one posting a dyno R-V6 of their J-pipe as I asked from the start. XLR8 posted their gains as well. So This thread is more than just claims they are real.
02-23-2011, 12:56 AM
#101
Suzuka Master
iTrader: (2)
LOL, I don't know where to begin.
First off, nowhere on that "dyno" does anything cross at 5250. You've got a mess of blurry numbers on the bottom with no rhyme or reason. It's supposed to be a linear chart, yet at each graph the "RPM's" increase anywhere from 300-500, which is bogus as hell.
The "before" numbers which we'll logically assume to be represented by the solid line, cross under 5k and show peak horsepower of about 187, which a 3G TL could probably put down on five cylinders. Then, if you zoom in on the chart and really squint, you'll see the "after" numbers cross dead center between 5100 and 5650, which works out to be 5375, not 5250.
So, after the install of this magic intake, we're now making a whopping 200 whp, which is still well under what a stock 3G should be making.
The chart is not keyed, it doesn't show any a/f numbers, it shows no indication of the brand of dyno used, etc etc.
You would probably benefit from studying some real dyno charts for this car!
Here's a legit Dynojet dyno, done by Temple of Vtec on an '04 TL manual.
http://www.vtec.net/forums/one-messa...sage_id=193390
First off, nowhere on that "dyno" does anything cross at 5250. You've got a mess of blurry numbers on the bottom with no rhyme or reason. It's supposed to be a linear chart, yet at each graph the "RPM's" increase anywhere from 300-500, which is bogus as hell.
The "before" numbers which we'll logically assume to be represented by the solid line, cross under 5k and show peak horsepower of about 187, which a 3G TL could probably put down on five cylinders. Then, if you zoom in on the chart and really squint, you'll see the "after" numbers cross dead center between 5100 and 5650, which works out to be 5375, not 5250.
So, after the install of this magic intake, we're now making a whopping 200 whp, which is still well under what a stock 3G should be making.
The chart is not keyed, it doesn't show any a/f numbers, it shows no indication of the brand of dyno used, etc etc.
You would probably benefit from studying some real dyno charts for this car!
Here's a legit Dynojet dyno, done by Temple of Vtec on an '04 TL manual.
http://www.vtec.net/forums/one-messa...sage_id=193390
02-23-2011, 01:31 AM
#102
Banned
Thread Starter
I did why? I read it the day you posted. I had no comment so i didn't well...comment. but i will now. How do you follow RV6's dyno?
Thats all I was telling him in the beginning. Because im not used to one that doesnt have TQ on left grid, HP on the right, and RPM on the bottom.
Thats all I was telling him in the beginning. Because im not used to one that doesnt have TQ on left grid, HP on the right, and RPM on the bottom.
04-10-2012, 09:47 AM
#105
Intermediate
04-10-2012, 09:54 PM
#106
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04-12-2012, 10:22 AM
#111
Race Director
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04-12-2012, 02:55 PM
#113
Race Director
iTrader: (1)
04-13-2012, 01:47 AM
#114
i am currently running atlp v2 w/ custom test pipe and Frankenstein catback
I can actually shift at 2k easily around city for all gears
power felt throughout all rpm ranges. I notice idle - 2k is quite good, and especially the 4k+ zone is very godly (I have immense throttle sensitivity even though I wear "nike SB" shoes which are pretty thick soled) I'd preferably like to drive barefoot but ever since i've gotten ton of dirt and oil on my pedals that is not an option now =\ Also anyone have an idea for very very cheap driving shoes?
I think i've honestly gained about a mpg or 2 due to losing 100~ pounds not sure if exhaust set up has anything to do with it
I can actually shift at 2k easily around city for all gears
power felt throughout all rpm ranges. I notice idle - 2k is quite good, and especially the 4k+ zone is very godly (I have immense throttle sensitivity even though I wear "nike SB" shoes which are pretty thick soled) I'd preferably like to drive barefoot but ever since i've gotten ton of dirt and oil on my pedals that is not an option now =\ Also anyone have an idea for very very cheap driving shoes?
I think i've honestly gained about a mpg or 2 due to losing 100~ pounds not sure if exhaust set up has anything to do with it
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maharajamd (04-13-2012)
04-13-2012, 07:41 AM
#116
Race Director
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09-12-2012, 10:57 AM
#117
Intermediate
Mr. Heeltoe, thank you for the video post. I've read through this and several other J-pipe threads. That is the single most informative post I've seen yet. It provides quantitative data along with audio and video material. It actually did what this post set out to do, too bad it wasn't the first response.
1. Can you, or anyone with similar helpful knowledge, comment on the clearance if the ATLP vs. the RV6 V3? Both websites proclaim their product has "maximum road clearance".
2. The video compared the RV6 V3 to the ATLP V2 + ATLP Rpipe test pipe, which is the most fair comparison of the two. So aren't we really comparing a $450 (RV6 J-pipe) mod to a $504 (ATLP J-pipe + Test Pipe) mod? I read earlier posts talking about how the ATLP was a better price point, when in reality it's not.
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MrHeeltoe (09-13-2012)
09-13-2012, 12:51 PM
#118
1. They both do a pretty good job. The pipes are pretty safe from hitting the ground although we do see there can be issues dragging the flex on both pipes. You need to be REALLY low for it to be a problem though, like 2.5" plus.
2. The ATLP has more features to go along with the higher cost...the removable cat section, the heat shields on the cat section, the better material. However comparing J-pipe to J-pipe only, yes you can "get an aftermarket j-pipe on your car" the cheapest with ATLP. Also note that when you get and ATLP J-pipe and Race pipe together the cost is now $479:
http://www.heeltoeauto.com/atlp-j-pi...-es0004v2.html
2. The ATLP has more features to go along with the higher cost...the removable cat section, the heat shields on the cat section, the better material. However comparing J-pipe to J-pipe only, yes you can "get an aftermarket j-pipe on your car" the cheapest with ATLP. Also note that when you get and ATLP J-pipe and Race pipe together the cost is now $479:
http://www.heeltoeauto.com/atlp-j-pi...-es0004v2.html
09-13-2012, 08:54 PM
#119
I'm a noob here. I see plenty of post saying "use the search" but every time I try to search something I get every thread on the site. i.e. search "j-pipe" and I get every thread where someone has a j-pipe mod listed in their signature. The only way I can find anything is to google it and click on the links to acurazine.com. Any tips on making the on site search function in a meaningful way?
09-13-2012, 09:03 PM
#120
I'm beginning to think that the idea that freeing the flow is a misconception in real world application for MPG gains. At the speeds and way you need accelerate to be fuel effecient, you aren't pushing out much more than the OEM system can handle.
Last edited by Bruce Banner; 09-13-2012 at 09:05 PM.
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