Supercharger Issue (advice welcome)
05-01-2008, 06:24 PM
#1
1st Gear Member
Thread Starter
Join Date: Jul 2006
Location: Louisiana
Posts: 143
Supercharger Issue (advice welcome)
I just got Brenspeed's Stage 3 Saleen Kit installed and the car is acting funny. Brenspeed is working onthe issueto see if it is in the tune, but I was wondering if anyone with any Twin screw charger who is running colder plugs can tell me if their acts like this. When I first start the car and drive away after it has been sitting like all night or the car cools down all the way it almost feels like it hesitates and kind of drowns in 1st and 2nd. But as soon as the car gets to temperature it goes away and the car seems to run fine. I have 20 degrees of vacuum, I have tried swapping out to the stock plugs and the car acted the same. Any help or advice anyone could give is appreciated?
05-02-2008, 09:09 PM
#2
3rd Gear Member
Join Date: Oct 2006
Location: Ohio
Posts: 889
RE: Supercharger Issue (advice welcome)
ORIGINAL: silver05gt1
I just got Brenspeed's Stage 3 Saleen Kit installed and the car is acting funny. Brenspeed is working onthe issueto see if it is in the tune, but I was wondering if anyone with any Twin screw charger who is running colder plugs can tell me if their acts like this. When I first start the car and drive away after it has been sitting like all night or the car cools down all the way it almost feels like it hesitates and kind of drowns in 1st and 2nd. But as soon as the car gets to temperature it goes away and the car seems to run fine. I have 20 degrees of vacuum, I have tried swapping out to the stock plugs and the car acted the same. Any help or advice anyone could give is appreciated?
I just got Brenspeed's Stage 3 Saleen Kit installed and the car is acting funny. Brenspeed is working onthe issueto see if it is in the tune, but I was wondering if anyone with any Twin screw charger who is running colder plugs can tell me if their acts like this. When I first start the car and drive away after it has been sitting like all night or the car cools down all the way it almost feels like it hesitates and kind of drowns in 1st and 2nd. But as soon as the car gets to temperature it goes away and the car seems to run fine. I have 20 degrees of vacuum, I have tried swapping out to the stock plugs and the car acted the same. Any help or advice anyone could give is appreciated?
I'm thinking the mixture is a bit rich (the 'safety factor'), and the engine a bit cold which makes the mixture even richer so you get the 'stumble'.
I just live with it as I don't believe nailing the throttle on a cold days with a cold engine would be the wisest course of action vis-a-vis engine longevity. I'm sure it could be fixed by leaning the A/F in the tune but then....
Be interested to know how you come out. You might mention to Daveand Brentwhat I wrote above.
How'd your numbers come out on the dyno?
05-02-2008, 10:02 PM
#3
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Join Date: Jul 2006
Location: Louisiana
Posts: 143
RE: Supercharger Issue (advice welcome)
Thanks 2007GT. That actually does make me feel better. I was kind of freaking out you know. New system, no problems like this before install, then installed and it started. So I thought for sure that the shop left something disconnected or something.... Brent and Dave told me they are going to look and see if they can safely change anything, but like I told them I would rather let the car warm up 3 minutes thencause damage to the motor. As far as dyno numbers go, I wish I could tell you. The closest dyno to me is 3 1/2 hours away. So until I can get a day off to get to Dallas I don't know what the car does. I am ready to find out though. My numbers should be pretty close to yours we have a pretty similar setup. But I know every car is different.
05-05-2008, 01:33 PM
#4
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Join Date: Jun 2007
Location: Orlando, FL
Posts: 2,276
RE: Supercharger Issue (advice welcome)
Read up on Spark Blow out. I just read about it today, that could be your problem. You could try a set of aftermarket COPS. Also you should really let the car get up to temp before getting into the boost at all.
Good luck I hope you get it sorted.
Good luck I hope you get it sorted.
05-05-2008, 01:53 PM
#5
3rd Gear Member
Join Date: Jul 2007
Location: South Carolina
Posts: 921
RE: Supercharger Issue (advice welcome)
I had this exact same issue using brent's tune. ( you should be able to search the several threads on this issue) They never did solve it I put up with it for several months. I would feel it in the pedal. I replaced COPS, FUEL system lines plugs twice. I put tons of money at the problem. Lucky for brent my input shaft snapped. Got the car tuned byS.T motorsportsand I have 0 issues none nothing. No hesitation the car gets up and goes. I sent several datalogs they never found anything. According to brenspeed they put this exact tune on tons of car's so there is something wrong with your car not the tune.
For a long time I didn't think the tune had anything to do with it.
For a long time I didn't think the tune had anything to do with it.
05-06-2008, 02:31 AM
#6
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Join Date: Mar 2006
Location: Las Vegas, NV
Posts: 326
RE: Supercharger Issue (advice welcome)
Mine does the same thing when its cold but I never even considered it a problem. After it warms up, runs great.
If it does something after it warmed up then you might have issues.
Have fun.....
If it does something after it warmed up then you might have issues.
Have fun.....
05-06-2008, 11:15 AM
#7
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Join Date: Jul 2006
Location: Louisiana
Posts: 143
RE: Supercharger Issue (advice welcome)
MustangGT0405, that is why I am confused. I already have MSD coils on the car. And as far as getting in it when it is cold. The problem I have happens at like 2000 rpms driving 20 mph, so it is not because I am getting in it. I will just try to pull away from a stop sign and have the problem. Pretty much when it is cold anything more then 1/4 throttle and it spits and sputters. And sevenleaf, that is pretty much what Brent and the guys are asking me to do now. Is send them datalogs and see if they can find anything. But based off of what I am seeing here it doesn't look good. Of course as helpful as Brent and Dave have been they also told me I was the only person, aside from one other guy, who has this problem.Like I said the only place close for me to take my car to is Dallas Mustang. And I am not sure how good their tunes are in comparison. If anybody has experience with their tunes please chime in.
05-06-2008, 11:39 AM
#8
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Join Date: Jul 2006
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Posts: 3,834
RE: Supercharger Issue (advice welcome)
I never had the issue when I had mine. i did not have the brenspeed tune, plus I do live in Florida so cold starts are few and far between....well of course there are cold starts...but I mean where outside air temps drop below 50,.....I never had the issue though..sorry...
05-06-2008, 05:15 PM
#9
Join Date: Jan 2008
Posts: 46
RE: Supercharger Issue (advice welcome)
welcome to the world of ECU tunning. had the same problem on my sentra ( lol i know) basically the ECU uses different fuel/timing maps depending on Engine temp and can even in some cases cross ref fuel/timing maps and make educated guess on how much fuel/timing to run. the tunes you have most likely don't fully address this. this is very common when u get a reprogrammed ECU. its extremely hard unless you know the coding inside and out to get the car to 100% driveablity all the time.
05-06-2008, 07:46 PM
#10
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Join Date: Sep 2006
Location: Gainesville, FL
Posts: 11,278
RE: Supercharger Issue (advice welcome)
ORIGINAL: silver05gt1
MustangGT0405, that is why I am confused. I already have MSD coils on the car. And as far as getting in it when it is cold. The problem I have happens at like 2000 rpms driving 20 mph, so it is not because I am getting in it. I will just try to pull away from a stop sign and have the problem. Pretty much when it is cold anything more then 1/4 throttle and it spits and sputters. And sevenleaf, that is pretty much what Brent and the guys are asking me to do now. Is send them datalogs and see if they can find anything. But based off of what I am seeing here it doesn't look good. Of course as helpful as Brent and Dave have been they also told me I was the only person, aside from one other guy, who has this problem.Like I said the only place close for me to take my car to is Dallas Mustang. And I am not sure how good their tunes are in comparison. If anybody has experience with their tunes please chime in.
MustangGT0405, that is why I am confused. I already have MSD coils on the car. And as far as getting in it when it is cold. The problem I have happens at like 2000 rpms driving 20 mph, so it is not because I am getting in it. I will just try to pull away from a stop sign and have the problem. Pretty much when it is cold anything more then 1/4 throttle and it spits and sputters. And sevenleaf, that is pretty much what Brent and the guys are asking me to do now. Is send them datalogs and see if they can find anything. But based off of what I am seeing here it doesn't look good. Of course as helpful as Brent and Dave have been they also told me I was the only person, aside from one other guy, who has this problem.Like I said the only place close for me to take my car to is Dallas Mustang. And I am not sure how good their tunes are in comparison. If anybody has experience with their tunes please chime in.
