My car is a 1989 Firebird Formula with a 355TPI, these are the specs:

Stock 305 heads, recently machined
Mellings 424in 444ex lift cam
All stock TPI manifold, with SLP #25 injectors off slp.com
full edelbrock exhaust with edelbrock street legal headers, and 3" cat back.

basically, im thinking of upgrading the base to the edelbrock base b/c i've heard the stock base on the TPI is very restrictive... how much hp do you guys think im pushing right now? and if i change the base, which is like 380 bucks how much more hp do you guys think i will see with my setup?? thanks a lot!

 

Just for sh*ts and giggles using Desktop Dyno 2000, heres what i used and came up with.

355ci
L98 heads 58cc 1.94/1.50
TPI
Large Tube headers with mufflers
Edlbrock .442 Single pattern(close as i could find-didnt feel like making one)

RPM HP TQ At the Flywheel

2000- 156 409
2500- 193 404
3000- 226 395
3500- 257 385
4000- 278 365
4500- 284 331
5000- 273 287
5500- 249 238
6000- 212 185

Take away the ideal tune, timing, VE, etc. I would say fairly close. With an aftermaket base i would safely say add 5-10hp and 10-15tq to them numbers.

Just my $.02

 

what do you guys think would be worth it, just upgrading the base right now, or waiting a little, saving the extra cash and switching over to a TPI/LT1 from the LT1.com site... im still not sure how much it would be but it should be well over 500 for the whole project, lemme know, thanks

 

your not going to get out of it less than 1K including all gaskets and etc. Stick with the TLR setup.

 

lol alright, thats kinda what i was waiting to hear... thanks

 

No problem. Good luck.