Kooks vs SLPs dyno results
05-24-2003, 10:09 AM
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Kooks vs SLPs dyno results I have stainless steel Kooks stepped headers on now. I got them to replace the SLPs a few weeks ago, upon recommendation. I can't post the graph right now, but a 3 pull average with 3.89 gears in a Moser 9 inch, yielded 427rwhp. Not bad. Switched to 4.30 gears which I currently run, and tossed the Kooks in. 3 pull average yielded 439rwhp. Now I'm not sure what kind of power loss I had going to the 4.30s over the 3.89s, but my guess is around 5 to 10rwhp. Correct me if this is too much. But the results were clear. The curves were practically the same until around 4000 rpm, where the Kooks pulled away hard. Torque was carried much higher than using the SLPs, and horsepower was up significantly at 6000rpm and above. Unfortunately, I don't have any track times yet. The BG event will be my testing grounds. I am VERY happy I decided to replace the SLPs. I fully expect to pick up 2 mph and 1 to 2 tenths. Thanks Kooks 
05-24-2003, 12:05 PM
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Re: Kooks vs SLPs dyno results Wow!! What diameter were the SLP's and what are they for the Kooks? That is a pretty big improvement. Up top, I am guessing the Kooks run away because of the stepping....
05-24-2003, 12:44 PM
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Re: Kooks vs SLPs dyno results man i wish you had not swapped the gears
as i also plan on swapping out the SLP headers for a set of stepped KOOKs headers for testing and i also plan to test KOOKs merge collectors
what did you use for a y pipe with the KOOKs????
as i also plan on swapping out the SLP headers for a set of stepped KOOKs headers for testing and i also plan to test KOOKs merge collectors
what did you use for a y pipe with the KOOKs????
05-25-2003, 01:31 PM
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Re: Kooks vs SLPs dyno results Chef, yeah I wish I had a chance to test them before I swapped out the gears, maybe you can do a back to back test with your setup. I'd like to see the difference.
No pics right now, but you can find some on here somewhere.
I will post up the graph on Tuesday, but I need someone to host it for me.
No pics right now, but you can find some on here somewhere.
I will post up the graph on Tuesday, but I need someone to host it for me.
05-25-2003, 01:36 PM
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Re: Kooks vs SLPs dyno results Nice gains, I'd like to see a comparison over some flp's or hooker longtubes, it's pretty well known the slp longtubes don't keep up w/ flp's, hooker, grotts etc. up top.
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05-25-2003, 01:44 PM
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Re: Kooks vs SLPs dyno results im happy with my SLPs... they have very well done their job and im not really convinced that Dynos can prove everything... Id like to try a different header but until I see significant proof that one is actually better than the other im gonna keep the SLPs...
05-25-2003, 01:55 PM
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Re: Kooks vs SLPs dyno results Dang Ryan still can't wait for a ride in that car!!! I would be interested in buying the SLP's if you still have them. Let me know. 
05-25-2003, 05:37 PM
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Re: Kooks vs SLPs dyno results
You need to bring your ride to the track. This goes for you, too Mike!
Haven't even had time to install the junk that's sitting on the shelf much less the cam swap 
Hoping to make it to SDR in the coming weeks. I'll give you a shout.....maybe we can line 'em up soon 
05-25-2003, 06:00 PM
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Re: Kooks vs SLPs dyno results
Ken, I sold the SLPs awhile back. You need to bring your ride to the track. This goes for you, too Mike!
05-25-2003, 08:19 PM
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Re: Kooks vs SLPs dyno results I'm not telling anyone "I told you so" but I did, Iv'e tested SLP's back to back against Hookers/Macs/QTP's and have seen the same if not better improvement every time. Yes, the SAME dyno being used back as this gentelman did for his comparison IS the only way to go. So figure even in poor atmospheric condiions with a lower SAE correction factor than his last visit would only be off + or - 1-2% worst case but is still above and beyond what LOnSlo's improvement was even with a numerically higher gear ratio, gotta luv that! The dyno difference between 3.89-4.30 should be about 6-9 RWH I think. Good show! and you should gain nicely at the track! Post graph plz 
.
Joe.
.Joe.
05-25-2003, 10:51 PM
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Re: Kooks vs SLPs dyno results Thanks Joe. As stated above, I should hopefully be a high 10 second car now, trapping around 125. Top end pull is amazing. One thing to note here. Peak torque was down 2 ft-lbs. That's PEAK torque. I now have up to 12 more ft-lbs in the upper rpm range over the SLP graph. These are the stepped version also. I'm sure the straight 1 3/4" tubes would have a much higher torque peak, but who's interested in peaks; not me.
05-26-2003, 01:10 AM
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Re: Kooks vs SLPs dyno results I used the Kooks y-pipe. Definitely not the best looking. In the future, I want to get the QTP y-pipe, as it has a 4" merge collector into the I pipe. Nice!
05-26-2003, 01:27 AM
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Re: Kooks vs SLPs dyno results
im happy with my SLPs... they have very well done their job and im not really convinced that Dynos can prove everything... Id like to try a different header but until I see significant proof that one is actually better than the other im gonna keep the SLPs...