Seeing 7lbsof boost from a 5lb sts kit
Seeing 7lbsof boost from a 5lb sts kit Why would I be see 7lbs?? My a/f is ok..its at .92 on the a/f gauge. I dont want to hurt anything by running it like this. the car is crazy. broke the tires lose in third gear went the boost hit. the weather here is only about 60 degrees could this be why I am seeing 7lbs??? I just dont want my iat's to get to high....
Originally Posted by blue-ss-camaro
Why would I be see 7lbs?? My a/f is ok..its at .92 on the a/f gauge. I dont want to hurt anything by running it like this. the car is crazy. broke the tires lose in third gear went the boost hit. the weather here is only about 60 degrees could this be why I am seeing 7lbs??? I just dont want my iat's to get to high....
Actually, if you have a boost controller hooked up, take it off and just run the one vacuum line.
Last edited by SSnakekiller; Oct 6, 2004 at 04:13 PM.
Originally Posted by blue-ss-camaro
It is tuned... I have a tune by nelson performance... I am super rich. did you not see the a/f numbers. I really think its cause it is so cold out.
If you are reading 920mv, that is not running rich. You actually want it in the mid 900's, around 950 for a conservative tune.
I was using a wideband to read them and the a/f gauge and when I was reading 9.9 on the wideband the a/f gauge read .93 mv that was with a innovative wideband gauge. I also have midlenth headers if that makes a difference. I also do not have a boost controller on the car. I call my dealer and he thinks that its cause its so sool out also. he is calling someone to make sure though. maybe I had the wideband in the wrong part on the y pipe. could this be possible??
TECH Addict
Joined: Nov 2001
Posts: 2,659
Likes: 1
From: Bellevue, Wa
As far as I know a wastegate will hold the boost at a certain level no matter if it's cold or hot.
either it's not seeing good signal, the spring is wrong, wastegate is broken somehow, etc....
I could be wrong on this but I am 99% sure weather will NOT effect boost levels on a turbo car.
either it's not seeing good signal, the spring is wrong, wastegate is broken somehow, etc....
I could be wrong on this but I am 99% sure weather will NOT effect boost levels on a turbo car.
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I def say wastegate too... maybe a bad wastegate or doesn the spring inside of it have something to do with it too? I thought you could tune the wastegate to sit at whatever initial pressure you wanted.. well whatever the issue im pretty sure its the wastegate
Originally Posted by Chris ARE 385
weather will not affect max boost in a turbo car provided the wastegate is correct. I wouldn't hammer on the car till you figure it out
.92 on my EFI live ='s 12.8-1 on my wideband,way too lean for a FI car.
Don't discount the possibility that your boost gauge is wrong. Best way to verify is to do a dyno session at a shop that has a calibrated psi gauge and compare yours.
That said, cold air does make a difference.
That said, cold air does make a difference.
Originally Posted by MIGHTYMOUSE
if you have injectors/tune and are conservative on the timing i would leave it.. 7 is not dangerous.. on a stock motor.. 10 would be
Ooooh OK, 9's AFR, yes ur running FAT!!! If you have checked all the stuff around the wastegate and are sure it is good, then you may want to check that your maf is functioning properly. I cant see how you are boosting 7psi with 9's AFR with a tune on stock injectors right? Could be something MAF related.
Also take apart the wastegate and check that the diaphragm is not pinched and make sure the spring and everything lines up correctly.
If all this fails, you may want to just get a 3psi spring for now, which will probably put you in the 5psi range considering what the 5psi spring is doing.
Now how nice am I to help out when we didn't even sell you the kit
Also take apart the wastegate and check that the diaphragm is not pinched and make sure the spring and everything lines up correctly.
If all this fails, you may want to just get a 3psi spring for now, which will probably put you in the 5psi range considering what the 5psi spring is doing.
Now how nice am I to help out when we didn't even sell you the kit
He hasnt had the wastegate apart or off. It was doing fine, then started to show more boost. Rick only suggested the boost reference line could be pinched or the brass elbow could be screwed in far enough to possible interfere with the air flow. Really havent seen any issues with the Tial wastegates. Everyonce in a while I will
see 6psi, but it usually is right on.
Chad, you might also put another vacume/boost gauge on to check and see if the gauge is reading properly.
see 6psi, but it usually is right on.
Chad, you might also put another vacume/boost gauge on to check and see if the gauge is reading properly.
12 Second Truck Club
Joined: Feb 2002
Posts: 5,574
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From: Sacramento, CA
On my kit without the FMIC I would see 6psi everytime I went WOT. Didn't matter what the outside temp was. Now with the FMIC I am seeing about 4-5psi with the original spring. Sometimes I'll spike to almost 7psi but it is usually near a shift point.
I am going to check out the wastegate today to make sure all is in order. I will try to get ahold of another boost gauge to see if it is the gauge. is there anyway that it could be the intake pipeing cause I blew One off by the MAF and after I put it back together I got 7lbs. also I could be rich cause I descreened the MAF. thanks for all the help guys......
TECH Senior Member
Joined: Nov 2001
Posts: 10,341
Likes: 1
Originally Posted by F8L Z71
On my kit without the FMIC I would see 6psi everytime I went WOT. Didn't matter what the outside temp was. Now with the FMIC I am seeing about 4-5psi with the original spring. Sometimes I'll spike to almost 7psi but it is usually near a shift point.
Talked to a few guy's up here that have turbo cars and they all have seen a gain of 2lbs when it is cold out. So I am guessing that the cold air makes a difference. What are the lowest temps you guys see??? It has been in the 50's to 60's here for a high....I would think the densor air would change things......