Uncorked Horsepower?

[kreymis]

i have a 331 tf tw heads w/ strim at 6psi. currently has a trick flow street heat intake a full exhaust with high flow cats. how much hp am i holding back with the intake and the cats. i kmnow its a problem just curious how much hp im killing right now. also what is good fuel pressure for my setup? it has 42lb injs

 

[revhead347]

With the blower forcing air down the throat, I don't think that intake is really hurting you at all. Maybe 10-15 hp to be squeezed out by pulling the cats. Maybe.

Kurt

 

[kreymis]

it feels like it wants to breathe better. plus i want more boost so i want to get a smaller pulley. currently has a 3.00 on it.

 

[xr8d302]

I notice you didn't mention a cam. Are you still using the stock unit? Something to look at

 

[kreymis]

its an afm i think b41 i forgot. its setup up for supercharger. the car just doesnt have a quick response when i mash the throttle while rolling in second gear. i feel it should just take off.

 

[HankyGT]

Sounds like an issue with the tune or a mechanical problem.

Is it tuned? Do you run an FMU or do actually have a good 1:1 rising rate regulator on the car? Although I am sure it is different with each tuner; mine requested 39# fuel pressure; and I only run 10degrees advance as the rest is ECM managed.

With a more restrictive intake, the car should actually feel MORE snappy in theory. Although I'm really not sure how much HP is lost between intake design once boost is added; I currenly run a Performer 5.0( not even the RPMII) with 165cc heads on my strim. It is the 8-10psi setup making 11psi with a powerpipe. The response in 2nd gear is instant and violent. It will just flash the tach as it spins the tires as hard as possible hooked up from a 45 roll.

I believe this is a combination of forced induction and smaller valves/runners creating tremendous intake velocity. The added cubes alone of a 331 should be getting things done in a hurry. I believe something is amis and not just a 'mismatch' on the combo.

 

[kreymis]

i still run the fmu setup for the 42lb injectors. i have to check the fuel pressure. im not sure what it is.i had the car tuned because it would barely run after the install. they burned a custom chip sct and dyno tuned. it feels like the exhaust is restricted probably from the cats cause when i go wide open the exhaust tone sounds weird. from a dead stop the car is great. from a roll it feels sluggish.

 

[Venom351R]

you shouldnt need an FMU with 42# injectors.

 

[GTA_V6_Mustang]

you may have restricted cats. Does it feel fine at lower rpms and then sluggish at upper?

 

[kreymis]

i have to really mash the throttle to get power out of it. i feel its the cats and the intake causing my problem.

 

[kreymis]

one thing i have noticed is i have a hard restart. i have to pump gas pedal to get fired up. maybe im losing pressure or one of my pumps is bad. i have a walbro 255 in tankand a trex inline.