I go ot the track every single weekend all summer long . Even in the dead of summer , I have never seen An LS1 car trap 100 . Slowest was 101 . And as for a variable in Performance , the LT1 has more variblase then any car I have ever seen in my life . I had a LT1 auto that ran smooth and quite . Good compression . Well maintained and was sluggish . TheI got the 6 speed camaro that destroyed it wth 2 times the milage .
And there are LT1's at the track with headers and cai that run 13.7-14.4 . Lighly modded .
I could see a geared/header/cai LT1 hanging for some time , but eventually the LS1 would conquer it . Im just basing this on my exp. with both cars . My car is faster then all lightly moded LT1's that I have driven " most where autos though " .

 

k... i'm moving back to sf at the end of the month. it may take a couple of more months for me to get my car back there, but i will roll your lt1. my car doesn't "loose steam" after 110. it will pull all the way to about 170 with no prob at the bay area's elevation.

 

Man , tell that to some ignoramace who knows no better . You car would not compare to my LS1 on top end . No chance . Im telling you from exp . My LT1 , red one in sig , hangs real well 1-2 , after that , its adious . I have another friend who has one with cutout . He tryed to do a fly bye and he couldnt do It . I saw him coming , there was 5 of us flying down the free way and I was in front . I heard him coming , downshifted , and gunned it . I caught his pace real fast . Obviosly you are not speaking from experience or you wouldnt be speaking such BS . tell someone who has not driven 15 of them and rode in nearly 30 . I know the differences between them . ANd I got mine up to 130 easily it just wanted to keep climbing with no end in sight .

 

Are you 100% sure all he had was LT's and CAI? I'm just asking because I heard most LT1's when bone stock dyno 235-250 RWHP. Isn't 60-70 RWHP gains a bit high for just headers and CAI? I've never had or modded a LT1 so I have no first hand knowledge on this but a LS1 would only gain about 35 RWHP from just LT headers and a Lid.

Correct me if I'm wrong but wouldn't an "average" LT1 not gain that much and trap that high on only those two bolt-ons?

 

Yes, I'm 100% sure of his mods. He had a CAI and Hooker LTs with a bullet and a dump off each header. His dyno numbers are a little high when compared to other 6 speed LT1s with similar mods, but a LT1 with LTs should dyno in the 300 rwhp range (it's been done many times).

If you choked LS1s up with sh1tty exhaust manifolds like LT1s are, you would gain 50 or so rwhp with LTs and intake as well.

You say stock LT1s dyno 235 - 250 rwhp stock? Automatic cars might dyno as low as 235, but if I had a 6 speed LT1 that dynoed 235 rwhp I'd drive it off a cliff. I'd say the norm for a GOOD running, 6 speed LT1 is 250-260 rwhp.

 

LT's will not yeild you 50 hp on a stock LT1 ...Thats rediculous . And the stock manifold flows plenty for a stock LT1 and upgrading the intake wouldnt get you any more HP on a stock LT1 .
I do agree that the stock manifoldsd suck badly on the LT1 and choke it out on top end . But it is not worth 50 HP .

 

Read my post again - I said LTs and intake. If you don't know that LTs/CAI will give you ~ 50 hp or so on a LT1, you haven't spent much time around/racing the cars...and if you have, you didn't pay much attention.

 

Man if that was the cas ethen the LT1 with LT's would have 325 HP..........w/e , thats all I can say . Im not going to argue . 50 hp is far fetched .

 

Man...are you really this ignorant?

There have been numerous LT1s trap 107+ with LTs/CAI which equates to much more than 325 flywheel (I assume your 325 hp number was flywheel..?) HP. If you can't grasp this, I'm done debating this with you.

 

LOL dude i was talkin about my mustang LOL. i did mention about how they dont run any better on the top end compared to any other car with a SIMILAR trap. My LT1 does NOT trap like an LS1, but my mustang DOES. did you guys not see the mustang on the sig???

 

I just spent an hour (yes I have too much time on my hands) researching CAI and LT header gains on LT1's. Now basically all I did is use the search feature here using key words "cai gains" and "header gains". I only searched the LT1 section because I figure they would know best (obviously). From all that searching and reading I found they basically said the gains from LT headers on a stock car is 20-25 RWHP. This is what LS1's gain as well so it sounded logical from that point of view.

Now when I searched for CAI gains they talked about FIPK, SLP and a few others whose names I forgot they said gains were only in the 7-10 RWHP range. They basically said the vendors say 20 hp but 7-10 is what to actually expect to the wheels. But when I add the numbers I only get about 35 RWHP gains.

Now you said a strong LT1 M6 dynos between 250-260 RWHP. If we go the high end of 260 and add 35 that's still only 295 RWHP. 310 is one hell of a great dyno. While there I read sigs that listed mods and dyno numbers and found the few with just headers, catback and CAI were generally claiming 285-300 rwhp which does sound right using the above math not to mention your own statement quoted above. And believe me it was hard finding sigs that didn't have at least a cam to go along with a huge list of bolt-ons.

My point to all this is simply that while your friend may have experienced some exceptionally good RWHP, TQ, and trap speed that he was definately at the high end of the spectrum. So by those same numbers if we went the low end we would have 250 RWHP + 27 for LT's and CAI. That means someone out there could have a M6 LT1 with LT's and CAI and only dyno 277 RWHP. I'm sure a dyno that low would be rare as well. I would guess the average would be inbetween the two numbers and probably around 295 RWHP. That would put the average right at or slightly above stock A4 numbers and just under stock M6 numbers (if we are talking 01-02 models with LS6 intake manifold).

I'm not calling BS on your friends numbers but to me that's like the LS1 M6 guys who claim 315-320 RWHP bone stock. While it can happen it's very rare and the average Joe shouldn't expect to get them but rather be pleasantly surprised if they are part of the lucky few. But hopefully they will not be too disappointed if they end up with closer to "average" numbers.

 

There is obviously going to be some variation, as there will always be. The 20-25 rwhp gain from LTs you quoted is definitely on the low side. My whole point was/is - if you take a bone stock LT1 that dynos in the 250 rwhp range, throw any CAI on it and a good set of LTs, the car will dyno right around 300 rwhp. It's been done over and over again. I never said you will gain 50 rwhp with just long tubes...but the addition of a CAI and long tubes should give you gains of about 45-50 rwhp and an increase of 4-6 mph in the 1/4.

A quick example - my '97 trapped 98.5 mph bone stock. I added a CAI, catback, and SLP (****ty) shorty headers and trapped 104. That's a 5.5 mph increase with shorty headers - not LTs. This is all bench racing, but 5.5 mph does not equal 25-30 rwhp no matter how u slice it. I have no doubt the car would have trapped 106 or so with LTs as have MANY others.

 

yes the stock manifolds on the LT1 are straight horrible,flow wise. From what i hear the LS1's exhaust "manifolds" flow close to what shortys do,which is why such a drastic gain isnt seen on the LS1 with the same mods,it already has a decent exhaust from the factory.

 

Im sure any member on almost any member on here that has been around for a while would agree with me . I seriously dont think you now what you are talking about . This is a outragous claim . Not one LT1 person I have ever talked to has ever claimed a 50 HP gain from headers . Not 1 ! And I know dozens . Because they all know better then to make such a stupid claim . Im sure there wil be varibles but the most you would see is 20 HP ....maybe with enough bolt ons , 25 tops .

 

well, as that we were talking about lt1's and ls1's... none-the-less, i'll roll your mustang, too.