can someone help me to find out why all these mods have not made my car any faster. Im thinking custom prom but i sould be somewhat faster now.here are my mods. homemade ram air,air foil,24lb injectors,jacobs ignition,afpr,hypertech chip,comp 270 hr cam, comp double springs,fresh 30 over block with forged slugs,all new senors,the car runs fine but cant leave my friends stock iroc both are l98 tpi 350s would someone please tell me where im going wrong? thanks for any help
ps both are 91 speed density systems

 

I think your right.



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87 Z28 305 TPI, Auto, LT-1 cam (@.50 418/430, 194/199, LSA 111), roller timing set, 2.73, Gutted air boxes, K & N fillters, Dyno Max 3" cat back, 8.8 mm spirals, air foil, BFG Drag radials, and 170* Stat.
Old Best 15.414 @ 87.47.
new best 15.006 @ 89.55.
w/ drag radails 14.72 @ 92.1

“Fallen But Not Forgotten”

 

U are!! SD needs PROM adjustments for mods like that so its not going to run like it should, its still set to the stock performance.

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89 RS

Looking For:
87 IROC-Z28 350 TPI