Help me achieve 250whp.

[Shin]

I am more into cone dodging so I don't need alot of power, I also plan to stick to the nPI heads.

Parts I am looking @ getting;

PI intake mani
XE262AH Camshafts
2.5 X pipe
2.5 Catback
JLT CAI
Accufab plenum/TB
Alum DS (less hp to operate, more hp to the ground).
Lightweight Flywheel (less hp to operate, more hp to the ground).
_____________________________________________

I need some sort of tuning device, recommend one that I can tune myself.
For the TB should I get a 70 or 75 mm unit?
Do you recommend pullies? I've seen mixed feelings on them.
Any suggestions for other mods?

Thanks,

Chris

 

[mustangmike98gt]

the sct tuner is the best

 

[badass98svt]

Go with a march damper. very nice piece. I'll be picking one up before my motor is done.

 

[built454]

Go with the 70mm TB, the exhausts size you chose should be ideal. I used under size pulleys and so some gains, but everything helps with the 4.6. Go with the SCT programmmer. You should get a pro tune though to get the best fuel to air ratio through the torque curve. The most bang for your buck is a rear gear change. Good luck!

 

[Lee12609]

i personally like the sniper special forces, and depending on who you get it from (i can make a recommendation) you get free tunes for life and usually within hours. woke up my BONE STOCK npi, its easy to use, and support is second to none.

as for power, i dont the cams will actually hurt you on a tight auto-x coarse where you need a broad powerband. i'd concentrate on broadening the powerband that way you are able to maintain the same gear throughout most of the coarse. peak power wont mean nothing if you lose all your bottom end and cant get into the powerband before the next turn.

 

[Mustang Mark]

if you just went with the pi H/C/I you would be at or above 250rw with just a tune...

 

[Shin]

The more i look over that mod list the move a Cobra swap looks tempting...

@ Mustang Mark, the npi has a better torque curve.

@lee12609 those cams enhance the stock powerband and won't shift it right.

 

[Mustang Mark]

The more i look over that mod list the move a Cobra swap looks tempting...

@ Mustang Mark, the npi has a better torque curve.

@lee12609 those cams enhance the stock powerband and won't shift it right.

hmmm something i didnt know. how about a 5.4 swap? more torque than you will ever need and it has a good powerband up to 5-6k
that is if you feel like swapping

 

[Lee12609]

The more i look over that mod list the move a Cobra swap looks tempting...

@ Mustang Mark, the npi has a better torque curve.

@lee12609 those cams enhance the stock powerband and won't shift it right.

ah, i didnt even see what cam you listed, i just seen aftermarket cams and figured you had way too much cam as most people tend to do when choosing. the 262s are a good choice as would be hitech stage 1's. i believe the hitech's are capable of more RPM with upgraded springs so they'd be my choice, but i'd seriously think about getting some work done to them npi heads unless headwork isnt an option, not sure how much flow you'll get out of them even with good cams in stock form, even though there are some people (johnny langston) putting down good times npi...........

i think you've got a well thought out plan, go with it and save where you can on the engine because you know suspension and tires makes an auto-x car........

 

[Willis_98GT]

You can get fully assembled pi heads for the cost of those comp cams you want to get and you will get way more power.

 

[Lee12609]

Auto-x cars don't need much peak power, the PI swap moves the power higher with a slight loss down low (not a noticeable amount) and doesn't extend the powerband any which is what makes the most difference. The longer he is in his powerband in one gear the quicker his laps will be, not to mention the more time he can spend hitting his marks instead of shifting.

Auto-x cars require a different build than any other type of racing.

Also depending on his class he may not even be able to do a headswap, but if he is going with aftermarket cams I doubt that's the case, could be just beyond his mechanical ability.

I'd personally just do a kenne bell, suspension and tires and be way faster, but to each their own.

 

[Shin]

Auto-x cars don't need much peak power, the PI swap moves the power higher with a slight loss down low (not a noticeable amount) and doesn't extend the powerband any which is what makes the most difference. The longer he is in his powerband in one gear the quicker his laps will be, not to mention the more time he can spend hitting his marks instead of shifting.

Auto-x cars require a different build than any other type of racing.

Also depending on his class he may not even be able to do a headswap, but if he is going with aftermarket cams I doubt that's the case, could be just beyond his mechanical ability.

I'd personally just do a kenne bell, suspension and tires and be way faster, but to each their own.

Exactly on the PI swap, I can handle the swap but laying over dyno plots of npi vs pi I don't like the torque curve.

We can do any mods we want lol, the courses are tight enough that a KB upgrade would be too much power for me (due to my skill level)

That's why now I'm considering a 96-98 4v... 250~whp more rpm to play with and I can focus on driving instead of shifting.

 

[Lee12609]

Yeah but the 4v makes horrible power down low, expensive, and is a pain to work on.

The KB will require more refined throttle inputs and better tires but it will allow you to improve your times as your driving skill increases. if a positive displacement blower is out of the question I think your original posted plan would be the next to ideal route, broad powerband and a nice curve, can't ask for much more in auto-x unless you build the motor to spin real high.

 

[Shin]

Yea that's what I am thinking about the 4V's low end...

I have the 4V motor already gonna use the Teksid block to lose ~75lbs off the front.
I am glad I posted this up, I think the 2v will be ideal for me and if I see that I require more power I'll get the KB (if they're still making them LOL)

 

[Forsaken]

Its Autocross, so I'd highly suggest a gear change and a nice set of tires. That should allow you to come quick off the corners and use the power you have.