Firebird update
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From: Sacramento Ca
Car: 91 Pontiac Firebird
Engine: Killer SBC, w/ RV cam
Transmission: AutoMatic, w/ shift kit
Axle/Gears: Posi-Traction
Firebird update
Well we finally found out what was causing the heavy misfire/stumble on the Firebird.
We're running a MSD 7al2 or something like that, anyway that box has "pills" that need to be plugged in even if you're not using the retard features of the box, so we plugged in "zero" pills & re-checked the timing and it was at 63 degrees.
Now the timing is set to 36, the box is "zero'd" out and we have an chassis dyno appt this Friday.
Theres a points race at Sac Raceway on Sunday so I'm hoping that with our "old tune" (11.40 @ 130 mph)the time gets into the 10's and the MPH doesnt change.
We're running a MSD 7al2 or something like that, anyway that box has "pills" that need to be plugged in even if you're not using the retard features of the box, so we plugged in "zero" pills & re-checked the timing and it was at 63 degrees.
Now the timing is set to 36, the box is "zero'd" out and we have an chassis dyno appt this Friday.
Theres a points race at Sac Raceway on Sunday so I'm hoping that with our "old tune" (11.40 @ 130 mph)the time gets into the 10's and the MPH doesnt change.
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From: stockton, CA
Car: Camaro RS/SS
Engine: 5.7 LS1
Transmission: 4L60E Transgo shift kit, 3500 stall
Axle/Gears: 4th Gen Rear 3:42
Re: Firebird update
thats great new Marc!! Cant wait to see this beast in action!! Its always the little things that make a big problem! Get her DONE!!
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From: stockton, CA
Car: Camaro RS/SS
Engine: 5.7 LS1
Transmission: 4L60E Transgo shift kit, 3500 stall
Axle/Gears: 4th Gen Rear 3:42
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From: Sacramento Ca
Car: 91 Pontiac Firebird
Engine: Killer SBC, w/ RV cam
Transmission: AutoMatic, w/ shift kit
Axle/Gears: Posi-Traction
Joined: May 2001
Posts: 5,244
Likes: 14
From: Sac, CA
Car: '89 GTA
Axle/Gears: 3.27/9-bolt
Re: Firebird update
Joey- Inventor and abuser of the exclamation mark
Well we finally found out what was causing the heavy misfire/stumble on the Firebird.
We're running a MSD 7al2 or something like that, anyway that box has "pills" that need to be plugged in even if you're not using the retard features of the box, so we plugged in "zero" pills & re-checked the timing and it was at 63 degrees.
Now the timing is set to 36, the box is "zero'd" out and we have an chassis dyno appt this Friday.
We're running a MSD 7al2 or something like that, anyway that box has "pills" that need to be plugged in even if you're not using the retard features of the box, so we plugged in "zero" pills & re-checked the timing and it was at 63 degrees.
Now the timing is set to 36, the box is "zero'd" out and we have an chassis dyno appt this Friday.
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From: Sacramento Ca
Car: 91 Pontiac Firebird
Engine: Killer SBC, w/ RV cam
Transmission: AutoMatic, w/ shift kit
Axle/Gears: Posi-Traction
Re: Firebird update
As far as dyno results go, we only produced a best of 422hp, but the results showed we either have a slipping trans, or a way too sloppy converter.
Since the trans comes apart to install the transbrake, we should be able to see if there's a problem with the friction plates, or if the converter might have too much slippage.
The results weren't near what I expected, but if you think your ThirdGen is all that....dyno it. You'll be surprised too.
Last edited by 3rdBird; Mar 12, 2010 at 09:18 PM. Reason: mispel
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From: Sacramento Ca
Car: 91 Pontiac Firebird
Engine: Killer SBC, w/ RV cam
Transmission: AutoMatic, w/ shift kit
Axle/Gears: Posi-Traction
Re: Firebird update
Heres some pics, I have some video and will utube it this weekend.
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From: Sacramento Ca
Car: 91 Pontiac Firebird
Engine: Killer SBC, w/ RV cam
Transmission: AutoMatic, w/ shift kit
Axle/Gears: Posi-Traction
Re: Firebird update
Driving Ambition, Chassis Dyno.
Joined: May 2001
Posts: 5,244
Likes: 14
From: Sac, CA
Car: '89 GTA
Axle/Gears: 3.27/9-bolt
Re: Firebird update
Cool, one mystery at a time.
Dyno #'s are almost always less than expected when it's your first time. It's best used as a tool IMO.
Dyno #'s are almost always less than expected when it's your first time. It's best used as a tool IMO.
Joined: May 2001
Posts: 5,244
Likes: 14
From: Sac, CA
Car: '89 GTA
Axle/Gears: 3.27/9-bolt
Re: Firebird update
Well I'd say there are a lot of hobbyists that dyno just to "know" the #'s (bragging rights maybe?) and are not interested in tuning, or racing at all. That's fine, but for me I'd like to see improvements made from mods and to get ideas on possible issues.
Joined: May 2001
Posts: 5,244
Likes: 14
From: Sac, CA
Car: '89 GTA
Axle/Gears: 3.27/9-bolt
Re: Firebird update
"lowered expectations" http://www.youtube.com/watch?v=VRcj9WbHLjk 
Did you ever dyno the Formula Terrell? . ..or you mean the IROC back in the day?

Did you ever dyno the Formula Terrell? . ..or you mean the IROC back in the day?
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From: Sacramento Ca
Car: 91 Pontiac Firebird
Engine: Killer SBC, w/ RV cam
Transmission: AutoMatic, w/ shift kit
Axle/Gears: Posi-Traction
Re: Firebird update
Probs w/ Youtube, but the video is coming soon. Theres some video of my car reving to about 8100. Not to many cars I know that can say that.
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From: Sacramento Ca
Car: 91 Pontiac Firebird
Engine: Killer SBC, w/ RV cam
Transmission: AutoMatic, w/ shift kit
Axle/Gears: Posi-Traction
Thread Starter
Supreme Member
iTrader: (1)
Joined: Jan 2008
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From: Sacramento Ca
Car: 91 Pontiac Firebird
Engine: Killer SBC, w/ RV cam
Transmission: AutoMatic, w/ shift kit
Axle/Gears: Posi-Traction
Re: Firebird update
Well I ran it today and went thru tech and tech is more strict today than any other time I've been here.
An NHRA official was here today, so that may had something to do with it, but when I went to get tech'd, I had to explain how my Fuel Injection worked & had to show them I didnt have Thottle by Wire, data logging was questionable but he couldnt tell me how my system worked, so he let me go thru in the Pro Lane, (which is no electronics, No2, or delay box). Anyway I red-lit my 1st round so it wanst a big deal.
An NHRA official was here today, so that may had something to do with it, but when I went to get tech'd, I had to explain how my Fuel Injection worked & had to show them I didnt have Thottle by Wire, data logging was questionable but he couldnt tell me how my system worked, so he let me go thru in the Pro Lane, (which is no electronics, No2, or delay box). Anyway I red-lit my 1st round so it wanst a big deal.
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