I need to know how much TQ can a stock TPI produce, airflow wise. what will it limit torque to? Im planing a MAP TPI setup for my torquey 408 afr head sbc. deskstop dyno calls for 500/550. the tq comes in b4 4000 rpm. so I figure the TPI maybe useful.

Im switch from my single plane high rise, bbc tbi, 90# injector setup. to give TPI a try, for the added midrange it will offer. I know its TQ is great as well down bottom.

specs for the engine is as follows:
10.1 compression
AFR 190
JE forged pistons
6"rods
hydrallic roller cam
~.57/.57 219/227 112
1.6 roller rockers
retro fit hydrallic roller lifters
double roller short block


its going to be my daily driver, everything is in the machine shop. I need more info on what the TPI would do on my engine. I do not want to go to shorter runners, or anything radical, as I will effect my bottom end. which I do not want to do! I drive a heavy truck, so I really only want TPI for bottom and midrange.. my cam complements that as well.. granted it is know to pull way past it specified range. 1800-5800. so Im realisctially planing to spin my 408sbc to 6000-6200 rpm but more importantly I need low to mid. I figure the entire combo, make tq kick in @ 900 - 1000 rpm. I know that its your combo that limits rpm and performance. my combo is far from stock TPI heads, cam, displacement.

this is a full roller engine. so i know it will have more power with other setups, but what im asking is if the TPI in anyhow can limit for TQ goals? granted I know the hp will be lower.

again im asking tq limit here...

ill be using a walbaro 255 fuel pump, stock 350 corvette injectors, and the psi I maybe running in the range of approx 55-75... who know, but to say, fuel is not a object.

as well tuning will not be a object as well.. ill be using a wb02 and a emulator. in a couple days it will be very streetable.

so again with perfect tune, and fuel... airflow wise, what can the TPI limit as far a tq production? or how much hp/tq can it cut from my combo. granted everything else.

 

This shootout should answer MANY of your questions. The engine used was a healthy 383.

http://www.compcams.com/Community/Ar...?ID=1737510521

 

great link... that is EXACTLY what i was searching for.. anymore useful links on TPI you may want to share??

is your 406 going to be TPI as well?

 

Now that link is a sweeeet!!! That is one of the best I have seen.