guadofreak

iTrader: (1)

Well i dynoed my new grotts! I have hp gains from ~2K all the way to 6200!!! my previous dyno w/ the Borla Y-pipe and GMMG exhaust was 322.3 i am now making 342.3hp and i am still running rich. <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />

Now for torque...EVERYONE was saying they are way to big and i would lose torque. <img border="0" alt="[bullshit]" title="" src="graemlins/gr_bs.gif" /> Well i am very glad to prove everyone one who doubted WRONG. <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" /> I gained torque clear accross the graph from ~2K-6200rpm AGAIN. I looks like someone took a pen and made a new tq line directly above the old one. NO LOSS whatsoever! my prevois max tq was 334.2 i am now at 350rwtq. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

All in all i think these headers are great! and they will only shine more w/ big cubes/SC's.

I will try to find a scanner or try to get mine to work so i can post the dyno graph. if anyone can host it for me lemme know. thanx ~Eddie

And for those of you who didn't say they were too big. I thank you and you were right! <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

1madss

iTrader: (10)

Eddie,
Was that with cats? Hopefully I can check them out on Saturday at the track.

Mark

ONYXSS

guadofreak - glad to see the #'s. Mine are on the way. Was that through the Borla y-pipe? Or did you go with the Grot y-pipe? EVERYONE says the quality of the Grot y-pipe leaves a lot to be desired, but I'm still waiting to see if it is at least funtional.

Patrick G

iTrader: (14)

I concur. I've got 1 7/8" Whisper headers and I make monster torque down low...even better than when I had 1 3/4" G-Hanns.

John B

iTrader: (10)

guadofreak, congrat's and thanks for posting your results! People keep asking this BB and I keep telling them that the "trick" exhaust set-up for this motor is 1-3/4" to 1-7/8" stepped headers w/merge collectors and an "X" pipe w/true duals but not many people are interested in hearing this. I guess when I have mine set-up this way shortly I'll let the results speak for themselves. Nice to hear that 1-7/8" just by themselves work great!

y2khawk

iTrader: (5)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Bluestreak:
<strong>Besides, I'm thinking of going forced induction soon enough... single turbo... the 1-7/8ths will complement that very well.
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That's gonna be a tough one, headers and a turbo <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

CHRISPY

Yep you wont be running Grotts with a Turbo LOL <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
You are limited to a Supercharger if you want to keep those headers
Cheers,
Chris

TrahnZam WS6

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by John B:
<strong>guadofreak, congrat's and thanks for posting your results! People keep asking this BB and I keep telling them that the "trick" exhaust set-up for this motor is 1-3/4" to 1-7/8" stepped headers w/merge collectors and an "X" pipe w/true duals but not many people are interested in hearing this. I guess when I have mine set-up this way shortly I'll let the results speak for themselves. Nice to hear that 1-7/8" just by themselves work great!</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I've already got that exact setup <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Check sig. Old dyno numbers were with grots and a Y-pipe.

WILWAXU

iTrader: (6)

Now Eddie.. you already knew the answer to this question <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Linear Velocity

iTrader: (1)

Guado congrats! Those are awesome numbers, definitely very reassuring to my ears, I'm picking my car this Saturday and I will dyno the car without custom tuning, we'll see how these 1 7/8's do on a h/c car!

guadofreak

iTrader: (1)

Those #'s were through the "great <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> " G-hann ORY-pipe. All of my numbers are SAE corrected. It was stil a hot nasty day but oh well! I am EXTREMELY pleased w/ my stock motor output.

Mark, I think i will put the cats in it because the car is a bit too loud and a tad raspy. I will see what everyone thinks at the track saturday, You going? I am still debating whether or not my GMMG is too loud. The best part is i still get ALOT less drone than when i had manifolds and cats through the loudmouth. It is great! Who knows maybe w/ Joey's 3" Random techs i will lik ethe sound a bit better.

Linear Velocity

iTrader: (1)

Guado, how has the Y-Pipe been holding up for you? Are you going to keep it or swap it out, mine looked ugly and maybe a little hard to install but I think the functionality of it shouldn't be comprimised.

guadofreak

iTrader: (1)

It looks like crap <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> but from what i have gathered unless you are on a quest to get that LAST remaining hp out of your car i wouldn't bother messin' with it. it will however be about 4-6" to short. Just fair warning. Actually installing the Y-pipe was cake.(This is coming from someone who is mechanically inept <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> )

BTW-you can call me Eddie <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" /> <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />

JS

iTrader: (4)

Are the results over 1 3/4 grots?
Or going from manifolds to 1 7/8?

JS

Bluestreak

I have to agree with Eddie as well. My car is definitely taking full advantage of the cam now. The RPM's climb so fast it's scary.

I have not done any testing with these yet... but I will be getting a before/after dyno done very soon. The headers will be dynoed on stock program, with a new Dynomax Ultra-Flo muffler, and the stock LS1 intake. Then I'll be going back with the LS6 intake in place and a new program. I had 337hp/331tq on my last dyno... I'm hoping for 360/350 after headers... and then I'm really hoping to be knocking on 400's door with the program and intake... we shall see.

Besides, I'm thinking of going forced induction soon enough... single turbo... the 1-7/8ths will complement that very well.

I think Eddie has the ORP, but don't quote me on that...

Ian

Awesome! Thanks for posting your results!

<img src="http://www.salacious.de/Smiliez/sonstiges/Autos/auto555.gif" alt="" />

Trans Am WS6 420

iTrader: (14)

Has anyone dyno'd the difference between the 1 3/4 (FLP, SLP, Grotts, Etc.) and the 1 7/8 on a bolt on car? I'm kinda curious now... <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

- Matt

BadMonkey

iTrader: (1)

I haven't tried the Grotts (thats alot of work just to find out a difference IMO)but my numbers are this with the SLP's LT's 338.0HP/358TQ That is corrected of course otherwise it would have been 345HP/360TQ, in that ballpark is what they told me anyway (it was nice and cold out when I ran on the dyno that day <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> )It seems most headers get in the same general area when used on stock interenals. Not exact but usually within +/-5 on the TQ and HP.

<small>[ March 28, 2002, 12:31 PM: Message edited by: bd mnky ]</small>

verbs

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by John B:
<strong> I keep telling them that the "trick" exhaust set-up for this motor is 1-3/4" to 1-7/8" stepped headers w/merge collectors and an "X" pipe w/true duals but not many people are interested in hearing this</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I was very interested!!! I have them and love them. I do think I lost some low end torque over my o/r pipe, because it all merged into a 3" single exhaust before, and now I have a dual 3" exhaust, so my flow capacity has doubled.

Being that my car is just a bolt-on, I can't really take advantage of all that extra flow capability. But once heads/cam/FI/cubes come into play, I'm sure I'll see the added benefit....at least I hope I do!! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

The sound at WOT is godly, except for that damn rasp when you let off the throttle after you've been going WOT above 3000rpm or so!!

<small>[ March 29, 2002, 11:58 AM: Message edited by: verbs ]</small>

Black Sunshine/ 00SS

iTrader: (1)

Good info. I second the oppinion of the perfect exhaust being the LT, true duals, through X pipe. Been there, doing that. With bolt ons, the car just screams. I'm waiting on the heads to arrive & the reals gains to shine. I would venture to bet that even the turbo guys would gain a good amount going to a dual/X setup off the stock manifolds. Harlan, time to make a trip to Owosso. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />