Is it really possible to get 400 rwhp out of the SLP performance pac?

Includes:
Headers, Cats, Cat-back, lid, MAF, CAI, filter, programmer, 1:8 rocker arms, and smooth bellows.

 

I don't see how. Do they really rate it at 400 rwhp or 400 fwhp?

BTW, SLP headers are some of the worst headers to install. Keep that in mind if you're thinking about installing them yourself.

 

I ment at the fly wheel...sorry.

I know SLP lt's are the hardest to install, but i have hear they are really good quality and performance though.

 

I think they also come with an Underdrive Pulley.

 

Sure, I could see 400 fwhp. The 1.8s essentially increase the lift of the stock cam making it seem bigger. Couple that with the headers, intake mods, and a good tune, it should make 400 at the motor since most LS1s seem to be around 360 at the motor stock.

 

headers and catback = 25hp
lid = 10
rockers = 10

all the other mods probably don't add up to much. the CAI doesn't do much, the maf could actually hurt you, as could the programmer (specially with this many mods), filter, bellows and pulley don't do much.

with a dyno tune you MIGHT see 350hp at the wheels...which comes out to 390-400 crank hp.

honestly...i think there are cheaper ways to make the money. considering alot of those parts are worthless for hp.

$50 for a bellow?
$200 for a maf?
$300 for a programmer?
$100 for a CAI

money better spent elsewhere

 

how could the MAF or programmer hurt?

 

many guys on here have shown slower times after using the "performance tune" on handheld programmers. they just aren't optimized for modded cars. they work goood for shift points/firmness on autos, gear changes, etc...

but the A/F tuning...is ..well...****ty

for $250 you can get a MUCH MUCH better tune from www.madz28.com or www.pcmforless.com
or for $350-400 a dyno tune

and many guys have also shown loss of power from MAF upgrades. but it's kindda 50/50..some do some don't. has to do with leaning out (or is it richening up) your A/F...if it does it in your favor you gain, if it goes the wrong way it will hurt you. most dyno tuners don't like using them, what does that tell you?

not sure how much the "package" you were looking at costs...but here is my breakdown of a better choice:

flowtech or pacesetter headers, off road ypipe = $600
LM exhaust or Hooker = $300
SSRA and lid = $300
LS6 intake (if needed) = $350 (used plus cost of coolant tubes)
madz28 tune = $250

should be about 340rwhp, maybe a bit more depending on the car...which is 380-390 at the crank. and that is without the $700 or so cost of rockers. go buy a cam kit for that much and make 2x as much as the rockers.

 

Amen to that. If you shop well, for the price of JUST rockers you could get a cam etc and make 370+ RWHP. The slight gain in lift from 1.8 rockers = slight gain in HP usually. But the longer duration and lift of a cam is where the power lies.

I've also read a thread where people actually lost some power with the longer SLP rockers.

Do a search. SLP is not the best solution. The power pack is for people too lazy to research or too new to know better and too much $ on their hands.

 

I wasnt going to get the power pack. i was just curious.

however, i do have the programmer and larger MAF already, and i have shown an increase at the track.

 

It can easily hit 400 flywheel...remember ls1's are really around 350 hp stock...and slp's using that to its advantage as a sales pitch...There's cheaper options out there that will give you just as much if not more power

 

IM not trying to steal this thread but i have a quick question about 1.8:1 rockers. I was looking through my new summit magazine and saw Harland Sharp rockers for $389.95. Would it be worth it? And if i were to buy them, would i have to get or tune or could i run it on the stock ECM? Thanks For the help.

 

tune = optimized

Gains will be minimal for the price. Buy a cam. Better yet, buy a cam that has the lift and duration that you want instead of having to fork up an extra $400 to get it.

 

Just a quick note -- "fwhp" is not flywheel horsepower. It's front wheel horsepower. If SLP has anything to give you 400 fwhp on an F-body, then I want it.

If you're talking about measured flywheel horsepower, the proper term is brake horsepower (bhp).

This article has a good description of bhp in the fifth paragraph.

Sorry to nitpick!

-Jake

 

Screw that, the only thing I want my front wheels doing is to steer