Hey i was wondering if there is anything i can do to my stock tpi to add power while still keeping it stock?

 

well to keep it stock, and make power you can do a few things

play with timing...see what the motor likes best

chip tuning...even stock vehicles can benefit from chip tuning

Port the stock base/plenum. Gain some flow and possibly pick up some power.

TB bypass keeps the TB cooler and thus intake air charge that comes in is cooler. mostly beneficial while the motor is running and has reached full operational temperature. The TB is not at coolant temperature, so air is not gettin heated as much.

add hotter ignition could help some

gut the stock TPI air intake box. free up flow in there. drop in a high flow filter. that is a big restriction to the TPI cars. cutting the bottoms out of the box will greatly increase air flow.

Lower temp thermostat will keep motor cooler and could make more power.

thats all i can think of for now

 

An adjustable fuel pressure regulator would help your performance too.

 

I'm sure this is not the norm. But I added a Holley AFPR and went from the stock 45psi to 49psi and seen no increase at all in MPH at the track.

 

my car is already running abit rich...increasing the pressure probly wouldnt help any..but could help if you port the stock manifold and such.

some cars tho might be out of tune and are lean, where fuel pressure would help

 

Since it's a simple turn of a ****, this year at the track I'm going to drop the pressure and see if that helps at all. My car also seems to run a bit rich when just driving around town according to my laptop.

 

It seems to be the norm for most cars. I have done searches, as I wanted to get a fuel regulator, and every search gave me post after post of guys seeing hardly any results. Some guys have actually turn the fuel back down close to stock and ran better times. Lean is mean.

 

would porting the heads still be considered stock?

 

Changing the fuel pressure on a speed density car will richen it up and yes probably won't help. But on a MAF car the ECM can better compensate for the higher fuel pressure and keep a good AFR.

The higher pressure gets better atomization of the fuel so it gets a more complete burn. More power less emissions.
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Stock is a relative term. The heads are still the stock heads but they have been modified. Once installed no one will know you did anything to them unless they do a tear down.

 

i agree that higher pressure means better atomization of the fuel but higher pressure also means abit more fuel. Since my car is already running abit rich, but not that rich, i'm curious to see if more fuel pressure would help. I generally heard TPI bolt ons combined with more fuel pressure does help power. but by itself i'm curious to see some hard evidence to support this.

 

TPIS proved this on a dyno years and years ago, it's a proven upgrade. Higher pressure means more fuel but the ECM should see the decrease in AFR from the oxygen sensor and cut back on the pulse to get back to the programmed AFR. A MAF car makes these adjustments better than a speed density car. Also you can get the granatelli adjustable MAF, which I have, and use this as a tuning tool as well to adjust AFR.