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Discussion Starter #1
Hey Folks,

I am looking to upgrade the output of my 4.6L and have a few questions. Right now, I am still debating on the supercharger vs. PI head swap. I am not very interested in going into the shortblock, but I would like to see mid 13's (possibly with the stock 3.27s to maintain highway driveablility). Plans are the T-Mod ;), torque converter, driveshaft, throttle body, 80mm MAF, and dual exhaust. These are all compatible with either engine buildup. So...

1) How effective is a roots type blower with the stock heads? Is 300 rwhp possible without pusing it too hard? (Note: Not too interested in centrifugal unless there is a MASSIVE difference)

2) Which MAF meter is better, Mustang or Lightning? Do I replace the whole assembly or just the electronics?

3) What is your opinion on PI vs. supercharger? Not to start another debate, but I am still totally unclear on this. Mid 13's with about 300 at the rear is my goal. This is a daily driver, so reliability, gas mileage, and maintenance are concerns.

I know these issues have all been addressed before, but I am still a little confused. :confused: Thanks.

Brian
 

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bbickers said:
Hey Folks,

1) How effective is a roots type blower with the stock heads? Is 300 rwhp possible without pusing it too hard? (Note: Not too interested in centrifugal unless there is a MASSIVE difference)
as effective as it can be consider the flow restriction :p 300 rwhp is possible, off the top of my head i know A-Train gets 325 with the stock heads and manifolds. EECDOC i think has more and Mager is flirting with 300(i think, again)

2) Which MAF meter is better, Mustang or Lightning? Do I replace the whole assembly or just the electronics?
best person to ask about that is Dennis. hes been pushing the Mustang MAF for the stock guys but the lightning will probably have better flow points for the increased flow that the blower or heads will give you.

http://www.reinhartautomotive.com

3) What is your opinion on PI vs. supercharger? Not to start another debate, but I am still totally unclear on this. Mid 13's with about 300 at the rear is my goal. This is a daily driver, so reliability, gas mileage, and maintenance are concerns.
with 300 at the rear wheels you should be able to run down the quarter quicker than mid 13s depending on what else youve got in the car, but thats beside the point. the question is really how much you want to spend. the head swap will be cheaper but the AED will probably give you more power in the end. a stock car with PI heads is around 220rwhp while a stock car with an AED is closer to 260. thats just bone stock otherwise though, i realize you want a little more. the key with the blower is not getting your right foot into it too much until its tuned. bad air/fuel = things go boom.

if i had to choose, id go with the blower, just because ive seen the good numbers it can put out with a good tune. but the heads can also put out great numbers and for the price are probably a better bargain.

just my $.02
 

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They both have alot of the same problems, octane of gas, needing a tune, etc.

To me it boils down to cost and maintainance. The PI headswap would be cheaper at first and in the longrun (no SC belt , SC fluid, or bearings to go bad).

Mike V ran 13.7 with:
PI heads
Bullitt Intake
Mark 8 TC
J-modded trans
3.73 gears
Inject-tech chip.

The bullitt intake shows very little gain over the GT unless the application is supercharged. The only reason to get a bullitt intake over a GT intake in a Nat. Asp. application is if you are uncomfotable with a plastic intake.
 

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Discussion Starter #4
Thanks for the advice, ya'll. Sounds like PI is the way to go for me. It will be interesting to see the results. :D
 
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