I was going to put some SLP runners on my TPI ZZ4 w/ a 58mm TB. I want to run mid to low 12's at the track. How much of an improvement can I expect on the dyno and or track if I simese the runners and intake base?

Right now I run a 13.54 @102.8X. Dynoed at 257 hp and 356 tq.

I got the low end but it stops pulling at about 4500rpms.

PS- I'm trying to keep the same cam and heads.

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Mods: ZZ4 engine w/stock TPI, adj, fuel pres. reg., MSD 8.5, HI6S ign. w/ PS-91 coil, K&N filter, TPI air foil, Hooker comp. shorties, American Thunder flows. 160* stat., TB bypass, 3"cowl, bat. relocate, AC delete, smog delet, cats gutted, stock T-5 w/ 3.42 rear, ported plenum, 24# inj., dual friction centerforce.

 

you'll notice a nice gain with the runners, now i'm no expert but i doubt u'll hit low 12's with those L98 heads and ZZ4 cam, i'm sure somone can chime in here with more info

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*89 Trans Am GTA
*Moderator at www.transamgta.com

To hell with the GM vs Ford war. We must unite, as brothers to fight the plague that is overtaking the world...RICE

Tony

 

I'd say a 58mm TB is too big, buy a 52mm TB. Try some 1.6 ratio roller rockers and a high flow base manifold too. Low 12's will be almost impossible w/o a power adder. What do your 60 ft. times look like? Pull a wickedly fast 60 ft. time and you may get close to your goals. Good luck.

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1986 IROC, fully loaded, Mini Ram'd 383, Art Carr 700R4, Accel DFI, 12 bolt rear, etc, etc......

 

My 60' is a best of 1.93. I was thinking more of a mid 12 and spray into the 11's. Right now I got stock suspension and street tires. I don't have just L98 heads and ZZ4 cam, I got the complete long block w/ a stock TPI setup on it.

More importantly I just want to run a 12. I don't care what kind of 12, high or low. I'm still running they stock 305 chip in my car so I think that I could use a lot of tuning.

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Mods: ZZ4 engine w/stock TPI, adj, fuel pres. reg., MSD 8.5, HI6S ign. w/ PS-91 coil, K&N filter, TPI air foil, Hooker comp. shorties, American Thunder flows. 160* stat., TB bypass, 3"cowl, bat. relocate, AC delete, smog delet, cats gutted, stock T-5 w/ 3.42 rear, ported plenum, 24# inj., dual friction centerforce.