2002_TAWS6

In here it says that those headers could give a 01-02 LS1s 41 HP increase

http://www.slponline.com/view_produc...RTNUMBER=30053

anyone dynoed that? How much RWHP increase?

hope they didnt mean 41 at the flywheel or something ...

Also how much horsepower increase on motor?

Dave

41 HP from just headers?
I smell <img border="0" alt="[bullshit]" title="" src="graemlins/gr_bs.gif" />

WILWAXU

iTrader: (6)

I'm sure that means flywheel horsepower. General rule is to divide that by 15% for a rear wheel figure.

American Muscle

They gained 41 rwhp on a car that already had heads and cam on it. Most people with stock heads and cam get 25 rwhp from them.

2002_TAWS6

since 41/15% is about 6... then are they trying to argue that $800+ is worth getting headers which allow 6 RWHP increase?

damn... i thought headers give LS1s at least 20 RWHP but i was wrong.. way too wrong... i guess my dreams are over <img border="0" alt="[kaboom]" title="" src="graemlins/gr_bomb.gif" />

niphilli

I am not sure about that division but those were RWHP # on an engine that previously had manifilds, Cam, heads..... Expect 17-25 RWHP after installation on bolt on Car when A/F is in tune. I think what Wilwaxu was trying to say was multiply that number by .85 if it is indeed a FW #

<small>[ September 16, 2002, 07:02 PM: Message edited by: niphilli ]</small>

SS125

iTrader: (1)

Let me guide you to my experience with SLP and it's headers!!!

http://www.hoodscoop.com/ubb/ultimat...;f=10;t=006637

This should help you.

I personally don't think the headers do a thing. All the horsepower, as far as I'm concerned comes from the SLP Y-Pipe. You'll notice I got the gain in horsepower when I changed the y-pipe. THen you go buy the headers (which by the way come with a y-pipe) and really no change. I would like to know of people who did the same as me, wasted the money for the y-pipe to hook up to the stock manifolds, got the hp increase, then bought the SLP headers (with y-pipe) and didn't get a whole lot.

<small>[ September 16, 2002, 09:39 PM: Message edited by: SS125 ]</small>

WILWAXU

iTrader: (6)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by niphilli:
<strong>I am not sure about that division but those were RWHP # on an engine that previously had manifilds, Cam, heads..... Expect 17-25 RWHP after installation on bolt on Car when A/F is in tune. I think what Wilwaxu was trying to say was multiply that number by .85 if it is indeed a FW #</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Hehe.. yeah,, that's more like it <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Dave

so on an otherwise pretty much stock car, the Y-pipe is worth more than the headers? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

niphilli

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by SS125:
<strong>Let me guide you to my experience with SLP and it's headers!!!

http://www.hoodscoop.com/ubb/ultimat...;f=10;t=006637

This should help you.

I personally don't think the headers do a thing. All the horsepower, as far as I'm concerned comes from the SLP Y-Pipe. You'll notice I got the gain in horsepower when I changed the y-pipe. THen you go buy the headers (which by the way come with a y-pipe) and really no change. I would like to know of people who did the same as me, wasted the money for the y-pipe to hook up to the stock manifolds, got the hp increase, then bought the SLP headers (with y-pipe) and didn't get a whole lot.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">How does your A/F Look? THis does not sound right. I dont think the SLP header is the best out there but it is not the worst, and I would think that you would gain AT LEAST 15 RWHP. Especially on a '99. Sounds like there may be some HP in tuning your car. PS; I have SLP's Y and did not gain much from it. Maybe 5RWHP.

BAD APPLE

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by SS125:
<strong>

This should help you.

I personally don't think the headers do a thing. All the horsepower, as far as I'm concerned comes from the SLP Y-Pipe. You'll notice I got the gain in horsepower when I changed the y-pipe. THen you go buy the headers (which by the way come with a y-pipe) and really no change. I would like to know of people who did the same as me, wasted the money for the y-pipe to hook up to the stock manifolds, got the hp increase, then bought the SLP headers (with y-pipe) and didn't get a whole lot.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I think your experience is quite unique. Most people see the opposite. A Y-pipe will give you a slight bump in flow, maybe some horsepower, and a little better sound. The headers absolutely provide a larger flow gain than a Y-pipe. If you didn't see any gain from them, I would agree with some of the above posters: it's in your calibration.

SS125

iTrader: (1)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by BAD APPLE:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by SS125:
<strong>

This should help you.

I personally don't think the headers do a thing. All the horsepower, as far as I'm concerned comes from the SLP Y-Pipe. You'll notice I got the gain in horsepower when I changed the y-pipe. THen you go buy the headers (which by the way come with a y-pipe) and really no change. I would like to know of people who did the same as me, wasted the money for the y-pipe to hook up to the stock manifolds, got the hp increase, then bought the SLP headers (with y-pipe) and didn't get a whole lot.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I think your experience is quite unique. Most people see the opposite. A Y-pipe will give you a slight bump in flow, maybe some horsepower, and a little better sound. The headers absolutely provide a larger flow gain than a Y-pipe. If you didn't see any gain from them, I would agree with some of the above posters: it's in your calibration.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I've been autotaping and autotaping and autotaping and I've finally got this to where it's running just a little lean(average LTFT's = .97, as close to 0 as I can get it). So the A/F should be right on. But right after all of this, i took the car over to SLP who in turn tested everything and found nothing. They even said it was running a little lean, but not bad. They were stumped also and provided nothing further. They scoped the car and said everything was fine. So, I could only conclude after everyone tells me that it's in the a/f and the dyno was wrong and forget the dyno numbers and go to the track and get the results (which by the way I didn't get) that to go from 318 stock, to 333 with lid, filter and y-pipe, and then 335 with headers, the y-pipe gave it's umph the first time around and the headers may work better with heads and cam, but stock, it's not adding a lot. jmo

<small>[ September 17, 2002, 10:47 AM: Message edited by: SS125 ]</small>

SHARKSS

I have a 2002 SS with the automatic. I took out the MAF screen and the dividers, put in a K&n filter, 160 Thermostat, Ram Air kit from SLP and my own smooth bellows ( 4" rubber plumbing connector from home depot, only $4.00)I installed Slp long tube headers, random tech high flow convertors and slp y-pipe. I dynoed the car before and after and picked up 14 hp and 14 lbs/ft. i also only gained a tenth in the 1/4. After looking at the stock parts i truly feel the gains were from the y-pipe as the stock y-pipe tube from the drivers side is smashed down for clearance. also these gains (14&14) were not realized until RPM's were above 3600. Down low the gains were only 3-6 on both. My car is mostly stock so the gains were small, but would probably be more significant with heads and cam. Will probably pull them off over the winter and sell them. The stock exhaust manifolds looked pretty good for flow (once you see the inside of them)

TA_2001

Hotcam+lid+catback everything else stock
330/330
added SLP long tube kit..

351/364

They are very high quality.. no problems in
10K miles..

http://ls1info.com

2000LS1

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Dave:
<strong>41 HP from just headers?
I smell <img border="0" alt="[bullshit]" title="" src="graemlins/gr_bs.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">https://ls1tech.com/ubb/ultimatebb.p...;f=24;t=003576

2002_TAWS6

WOOOOOOOOOOOOOOOOOOW... now thats what I call headers!

daaaaaaaaaaaaamnnnnnn... 40+ RWHP

Now I know that SLP Headers suck <img border="0" alt="[barf]" title="" src="graemlins/gr_barf.gif" />

2001 LS1 SS

SLP headers are just fine. I knocked about .3 secs off my 1/4, granted my car had broken in more, but the butt-o-meter doesn't lie. I didn't before and after dyno, so I don't know the numbers. It did "limp" the first 50 miles or so (pretty much the drive home after installing them) but opened up nicely after that. I don't know that ANY header, even Grotts, or this guys custom ones, will give you any more than 20 to 25 RWHP without head work, big hole lined up with small hole is limited by small hole!

And where did you get 6 rwhp? Deduct ~15 percent from FlyWHP to get RWHP, not take 15 percent of it. BTW SLP claims up to 41 RWHP, but that was gained on their H/C/Stroker/Beefy intake car. Headers are designed to flow as much air as possible, hopefully as much as you can push at them within reason, BUT they aren't going to make your engine magically overcome its other restrictions, they are just going to restrict your air output as little as possible. The stock manifolds are restrictive, the headers are less restrictive (much) thus the increase in power. If you were do do heads/cam then add the headers, you'd probably see the 41RWHP easily (in addition to what the H/C gave you).

The moral is, (whether or not we want to believe it), on a stock head car, almost ALL of the popular headers out there, even the MAC midlengths, show gains very close to each other. Some are going to prove themselves better when you start using their full potential however.... if you're gonna stay stock heads, get whichever header suits your needs best.

-Dave

SHARKSS

Dave
Not tying to disagree with SLP's ad or your experiences, but i was just relaying my results. I still feel that on a basically stock motor that the headers are a waste of money. Yea i'll agree they are nice and will probably outlast the car. By the way, 6 hp was at the rear wheels as i said i ran it on the dyno before and after, also ran it at the track twice before ( for a total of 14 passes) and have run it three times since (for about 18 passes)all under very similar temp, humidity and barometric pressure conditions so that i could honestly quantify my results. This was done just to confirm my testing for myself. Other than that it is a great car for the money and very consistant. I made 4 time trials and went 6 rounds in eliminations, and the car only varied .068 andthat is in the 1/4 not the 1/8.

WILWAXU

iTrader: (6)

Hmm.. my motor is basically stock... I gain 2 mph at the track with headers.

I will agree that the stock setup is much better than most give it credit for.. but headers do make a difference where it counts... the track <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

2002_TAWS6

so it should give 6 RWHP on an stock LS1 F-body?

What about if I have an airlid, a corsa performance exhaust, and an SLP y-pipe. How much should I be pushing now on motor and RWHP.

And by how much should those headers increase my motor HP and RWHP?

ofcourse i know that the answer ill get are estimated. I just want to know if that mod is really worth doing right now.