Parking lot slow crawl surge
Thread Starter
Supreme Member
Joined: Dec 2001
Posts: 1,997
Likes: 12
From: Bartlett, IL
Car: 92 ZR-1
Engine: LT-5
Transmission: ZF-6
Axle/Gears: SuperDana 44 4.10
Parking lot slow crawl surge
At very low or even closed throttle TPS%, its that bucking surge you get at very slow speeds typically going thru a parking lot. It does have cams, altho they’re not radical given that its an DOHC motor, but just wondering if I can tame it a bit more. SA is flattened.
Trans is a ZF-6 w single mass AL Fidanza FW and 4.10 gears turning 19” wheels.
Trans is a ZF-6 w single mass AL Fidanza FW and 4.10 gears turning 19” wheels.
Supreme Member
Joined: Jan 2003
Posts: 4,643
Likes: 317
Re: Parking lot slow crawl surge
Dom,
I also get a little of bucking with my Miniramed SBC, if I crawl forward with the brakes partially applied. I've never been able to fully get rid of it, so I just live with it. I've tired richening, leaning, more timing, less timing... nothing ever seemed to help. It idles very smoothly otherwise and if I crawl forward with no brakes applied I don't get any bucking.
The only way I could get rid of it would be to raise the idle speed by ~150 rpm, but with the tight stock converter, it starts pushing against the brakes a little too much while at a stop light.
I idle very nicely at 600 rpm, so in the end I don't really mind the minor bucking that much.
I remember reading some earlier threads on the subject...
https://www.thirdgen.org/forums/diy-...-timing-q.html
https://www.thirdgen.org/forums/diy-...llower-8d.html
I know the ECM's are different, but there could be some nuggets in here that could help...
I also get a little of bucking with my Miniramed SBC, if I crawl forward with the brakes partially applied. I've never been able to fully get rid of it, so I just live with it. I've tired richening, leaning, more timing, less timing... nothing ever seemed to help. It idles very smoothly otherwise and if I crawl forward with no brakes applied I don't get any bucking.
The only way I could get rid of it would be to raise the idle speed by ~150 rpm, but with the tight stock converter, it starts pushing against the brakes a little too much while at a stop light.
I idle very nicely at 600 rpm, so in the end I don't really mind the minor bucking that much.
I remember reading some earlier threads on the subject...
https://www.thirdgen.org/forums/diy-...-timing-q.html
https://www.thirdgen.org/forums/diy-...llower-8d.html
I know the ECM's are different, but there could be some nuggets in here that could help...
Thread Starter
Supreme Member
Joined: Dec 2001
Posts: 1,997
Likes: 12
From: Bartlett, IL
Car: 92 ZR-1
Engine: LT-5
Transmission: ZF-6
Axle/Gears: SuperDana 44 4.10
Re: Parking lot slow crawl surge
The LT-5 is an SD motor. What I learned tuning my Xfire is quite applicable and has been a big help.
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