Is my boost busted?
11-19-2004, 12:41 PM
#1
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Is my boost busted?
I was driving home last night and feeling a little friskier than usual. Traffic was very light so I was slowing down and gunning it, slowing down and gunning it. Tried it in 2nd and 3rd and 4th gears just to watch my gauges blip. I noticed something quite odd at that time. 2nd gear boost maxed at about 5.5psi, as expected from the HBP. However, 3rd gear would climb all the way to about 8.5-9 psi. 4th only 5.5. Is this normal or is there something wrong with my gauge/setup? I've never noticed this at the track because I'm usually watching the RPM's, not the boost gauge. Ideas? BTW, no pinging heard running straight 92. IMRC disconnected.
11-19-2004, 01:07 PM
#2
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Try to see if the belt tension is correct. Proper belt tension is really critical with the roots type systems. Also you might want to see if the by-pass valve is working properly.
11-19-2004, 01:31 PM
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Originally Posted by 808CLS
Try to see if the belt tension is correct. Proper belt tension is really critical with the roots type systems. Also you might want to see if the by-pass valve is working properly.
I would think I'd be seeing LESS THAN normal boost if the belt was slipping. 2nd and 4th gears see normal 5.5psi boost, but my 3rd gear is jumping UP to 8.5psi.
11-19-2004, 02:04 PM
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Originally Posted by mrsteve
Check the belt tension like others have mentioned.
I'll do that, but why would I only see it in 3rd gear and at NO other time?
11-19-2004, 02:08 PM
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I see different levels of boost in different gears as well. I never see 7psi in 1st, rarely in 2nd. I usually see about 5.5 - 6psi in those gears. Then 3rd and 4th I always see 7 psi.
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11-19-2004, 03:00 PM
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I guess I never paid close attention since it is pretty hard to read while driving...
I set my Peak boost light to go off at 6.0 psi and it lights up in every gear when going through the gears
11-20-2004, 12:48 AM
#9
'03 CL-S 6spd. 3.5psi only
This is one slow puppy! CT supercharger, full CT exhaust, B pipe and full suspension mods and only 3.5 pounds of boost. A lot of money spent for so little extra go. The belt is tight. Motor uses no oil. Brakes don't drag. Can someone with experience pressurizing this mill help me pull this thing off the pot? Thanx, squarecircle]
11-20-2004, 12:58 AM
#10
Blown is Best
Originally Posted by squarecircle
This is one slow puppy! CT supercharger, full CT exhaust, B pipe and full suspension mods and only 3.5 pounds of boost. A lot of money spent for so little extra go. The belt is tight. Motor uses no oil. Brakes don't drag. Can someone with experience pressurizing this mill help me pull this thing off the pot? Thanx, squarecircle]
Was your kit new?
11-20-2004, 01:13 AM
#13
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Originally Posted by squarecircle
This is one slow puppy! CT supercharger, full CT exhaust, B pipe and full suspension mods and only 3.5 pounds of boost. A lot of money spent for so little extra go. The belt is tight. Motor uses no oil. Brakes don't drag. Can someone with experience pressurizing this mill help me pull this thing off the pot? Thanx, squarecircle]
Slow compared to what?
11-20-2004, 01:15 AM
#14
Originally Posted by Allout
I've got similar mods and mine is pulling 4 pounds and runs very strong. Put it on a dyno and find out what it's putting out. Also check the air/fuel ratio. Possible that your Fuel Pressure regulator may need to be checked.
Was your kit new?
Was your kit new?
11-20-2004, 01:34 AM
#15
Originally Posted by Seattle Cl-S
Slow compared to what?
11-20-2004, 07:43 AM
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Originally Posted by Seattle Cl-S
I was driving home last night and feeling a little friskier than usual. Traffic was very light so I was slowing down and gunning it, slowing down and gunning it. Tried it in 2nd and 3rd and 4th gears just to watch my gauges blip. I noticed something quite odd at that time. 2nd gear boost maxed at about 5.5psi, as expected from the HBP. However, 3rd gear would climb all the way to about 8.5-9 psi. 4th only 5.5. Is this normal or is there something wrong with my gauge/setup? I've never noticed this at the track because I'm usually watching the RPM's, not the boost gauge. Ideas? BTW, no pinging heard running straight 92. IMRC disconnected.
11-20-2004, 07:44 AM
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Originally Posted by squarecircle
I met another cl-s with exhaust mods -- we compared both cars and both agreed something was amiss with my rig. My car ran stronger in first and second gear than his did but his had more pull in the top gears. squarecircle
11-20-2004, 01:07 PM
#18
Thank you for the comback, scalbert, Yes on the HBP---where do I buy it and what kind of boost gain will it achive? Will it work with inferior Calif. 91 octane fuel? Presently, there is no knock detectable above idle speed. Motor will ping once or twice off idle if I miss manage the clutch while starting out in first gear. Yes on the HBP---where and how much is my question. More info is much appreciated. squarecircle
11-20-2004, 03:46 PM
#19
GEEZER
Squarecircle
11-20-2004, 05:24 PM
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Originally Posted by squarecircle
Thank you for the comback, scalbert, Yes on the HBP---where do I buy it and what kind of boost gain will it achive? Will it work with inferior Calif. 91 octane fuel? Presently, there is no knock detectable above idle speed. Motor will ping once or twice off idle if I miss manage the clutch while starting out in first gear. Yes on the HBP---where and how much is my question. More info is much appreciated. squarecircle
11-21-2004, 04:22 AM
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Originally Posted by squarecircle
Yes on the HBP---where and how much is my question. More info is much appreciated. squarecircle
$75 Shipped
11-21-2004, 09:44 AM
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I haven't seen as much boost as I usually do in the past few days. I've been max'ed out at 6.5 psi. And the boost actually falls back about .5-1 psi before redline. I haven't checked the belt for slipping but it doesn't feel like it is. It has been very humid lately. I think that might be affecting the boost?
11-21-2004, 10:02 AM
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Originally Posted by mrsteve
It has been very humid lately. I think that might be affecting the boost?
11-22-2004, 09:18 AM
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Originally Posted by SCTL-SS
Hopefully that's all it is. When I noticed boost loss it was definately the belt.
I still see 6.5 psi peak boost. I guess the blower just runs a little more boost when it is below 50 degrees or so.
On a side note. I went to the track yesterday for a quick run with the new tires. 2.08 60'
Ran a 13.52 @ 106.4 at 65 degrees. I tried gate shifting and nailed the limiter on the 1 -> 2 shift. I plan on making more runs this upcoming weekend.
11-22-2004, 10:52 AM
#28
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Originally Posted by SCTL-SS
Hopefully that's all it is. When I noticed boost loss it was definately the belt.
This was my point earlier. With a slipping belt you'd expect loss of boost, not a gain. Why then am I seeing so much of an increase?
11-22-2004, 11:07 AM
#29
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Originally Posted by Seattle Cl-S
This was my point earlier. With a slipping belt you'd expect loss of boost, not a gain. Why then am I seeing so much of an increase?
Originally Posted by scalbert
Is your IMRC hooked up. If it is then maybe it didn't open all of the time...
11-22-2004, 07:19 PM
#30
Subie Dubie
Originally Posted by Smitty
I guess I never paid close attention since it is pretty hard to read while driving...
I set my Peak boost light to go off at 6.0 psi and it lights up in every gear when going through the gears
My kinda Guy
11-22-2004, 07:23 PM
#31
Subie Dubie
Originally Posted by squarecircle
Bless you SCTL-SS. Will do this coming week! All my mods were purchased from Velocity via Jason who was very helpful. squarecircle
11-22-2004, 09:01 PM
#32
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Originally Posted by scalbert
:cough:
If it is hooked up but didn't open you would see an increase in boost.
If it is hooked up but didn't open you would see an increase in boost.
Sorry Scalbert. You're a good guy and I'd hate to call you out, but in post #1 I said I have the IMRC disconnected...
11-22-2004, 11:04 PM
#33
Thanx for the come back Red Rider---Does the HBP change 1 or 2 pulleys and which 1/(s)? Will there be a belt problem? What is IMRC and what is it's function? Info is much appreciated! I need to wake this ride up. --- squarecircle ---
11-22-2004, 11:35 PM
#34
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HBP is just 1 pulley. I used the same belt. The IMRC, I believe, is 'intake manifold runner control'. It serves to maximize engine power above and below 4500rpm?? by altering the properties of the air rushing into the intake manifold. It is a little actuator that flips between intake settings. I have been told it is useful mainly in NA applications and can actually cause your car to ping a bit w/ the supercharger running the HBP or greater.
Most of us running the HBP just unplug it and never have pinging.
Most of us running the HBP just unplug it and never have pinging.
11-23-2004, 12:32 AM
#35
Thanx Seattle CL-S---Am I correct believing IMRC is an original factory system on my car? This may be a simple elect connector---If so, tell me where it is and how to identify it. ---squarecircle ---
11-23-2004, 06:31 AM
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Originally Posted by Seattle Cl-S
Sorry Scalbert. You're a good guy and I'd hate to call you out, but in post #1 I said I have the IMRC disconnected...
11-23-2004, 06:37 AM
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Now, why would you see more boost. Cooler weather can certainly do this as the efficiency of the blower increases as temperatures drop. But not on the level of which you are seeing and not for only a single gear.
Has this continued?? And increase in boost in all gears wcould point to a catalytic converter blocking up and causing boost stacking. But only occuring in a single gear is perplexing.
Just on a random thought, is there any way a vacuum line, etc. is being pinched when 3rd is being selected?
Has this continued?? And increase in boost in all gears wcould point to a catalytic converter blocking up and causing boost stacking. But only occuring in a single gear is perplexing.
Just on a random thought, is there any way a vacuum line, etc. is being pinched when 3rd is being selected?
11-23-2004, 12:08 PM
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Originally Posted by scalbert
Now, why would you see more boost. Cooler weather can certainly do this as the efficiency of the blower increases as temperatures drop. But not on the level of which you are seeing and not for only a single gear.
Has this continued?? And increase in boost in all gears wcould point to a catalytic converter blocking up and causing boost stacking. But only occuring in a single gear is perplexing.
Just on a random thought, is there any way a vacuum line, etc. is being pinched when 3rd is being selected?
Has this continued?? And increase in boost in all gears wcould point to a catalytic converter blocking up and causing boost stacking. But only occuring in a single gear is perplexing.
Just on a random thought, is there any way a vacuum line, etc. is being pinched when 3rd is being selected?
It actually has continued and I'm starting to see the boost creep up in all gears now. What would cause the Cat to back up? Does the Comptech B-pipe come w/ a new Cat or is the pipe only Cat-back?