HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Long tube headers and FAST 102 intake

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Long tube headers and FAST 102 intake

Post  docwyte on Mon Dec 06, 2010 11:47 am

Anyone get a set of long tube headers to fit on our car? How about a FAST 102 intake manifold/ t body without having to do hood clearance mods?

I'm trying to find another 30-40rwhp on my car. I'm under powered for the time trial class that I compete in. With the power I currently have I can remove almost 200 lbs from the car, problem is, I don't really have that to take out easily...

Having talked to a bunch of the F body tuners, they just don't think it's going to happen until I get a set of long tube headers and go with a larger intake manifold.

Apparently those are the choke points and swapping cams or heads is pretty much worthless until I address the intake/exhaust path...


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Re: Long tube headers and FAST 102 intake

Post  Admin on Mon Dec 06, 2010 11:56 am

No one makes a production header for our cars, You'll have to have them custom made.
As far as the Fast2 intake, it will not fit without hood modification done, Tom can comment on this Cool

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Re: Long tube headers and FAST 102 intake

Post  docwyte on Mon Dec 06, 2010 12:42 pm

That's what I was afraid of. I've seen a picture of a 944 swapped LS car with long tube headers, but I can't remember where and if he custom made them, or bought a set and then tweaked them to fit...

Edit: Do you think S&P can use the same jig they used for the short tube headers to make a set bigger primary long tube headers?

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Re: Long tube headers and FAST 102 intake

Post  Arthropraxis on Mon Dec 06, 2010 1:00 pm

That picture is in your thread on Rennlist. It was DVC's car. Thread response #215
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Re: Long tube headers and FAST 102 intake

Post  docwyte on Mon Dec 06, 2010 1:05 pm

Well, this does explain why most everyone I've talked to have dynoed around 340rwhp no matter what mods they have done to their cars.

TonyG has the Renegade headers, but I think his car is an aberration, as no one else has come close to his results...

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Re: Long tube headers and FAST 102 intake

Post  Admin on Mon Dec 06, 2010 1:28 pm

Renegade's headers are really close to the same length as the S&P headers. I don't think there would be much of a gain there.

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Re: Long tube headers and FAST 102 intake

Post  docwyte on Mon Dec 06, 2010 1:43 pm

Yeah, I know. Maybe the primary's are bigger on theirs? I dunno, but no other swapped 944 has come close to Tony's results.

Everyone I've talked to has about the same as me, ~340rwhp. It seems the shorty headers are the main restriction, followed by the inability to run a larger intake manifold...

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Re: Long tube headers and FAST 102 intake

Post  xschop on Mon Dec 06, 2010 1:47 pm

The RH headers are smaller primaries than S&P.
I have held a set of Camaro LS1 long-tube headers in my hands and they would be the ticket to a lower cost header, you just need to find someone to mod them.
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Re: Long tube headers and FAST 102 intake

Post  Arthropraxis on Mon Dec 06, 2010 1:59 pm

Contact DVC, since he has some maybe he can help you out.
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Re: Long tube headers and FAST 102 intake

Post  docwyte on Mon Dec 06, 2010 2:53 pm

I dropped him a pm on rennlist earlier this morning....

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Re: Long tube headers and FAST 102 intake

Post  944v8inDFW on Mon Dec 06, 2010 4:54 pm

After reading your threads on here and RL i honestly think your HP "problem" is your cam selection. Your cam could have very well been mis ground at the factory. I have put down well north of 400 HP with midlength headers, but then again I was not running a smog cam either. If i were hunting for power in your car, cam would be first, heads second followed by intake. I would alo fit test tubes to get rid of the cats for track use. If you have to pass smog i would have 2 computers, one for the track sans cats and one for smog.

I will prolly get flamed for this, but for a track only tune I would shut off the knock sensors once you get dialed in.

To me the cam is the easiest, quickest and most likely cheapest to find 30 or so HP.
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Re: Long tube headers and FAST 102 intake

Post  docwyte on Mon Dec 06, 2010 5:00 pm

I talked to Texas Speed and Performance about buying one of their cams and they doubted I'd get a 20-30 hp gain from just the cam because the headers and intake I currently have.

Their point was stock F bodies with my setup are making 20 more rwhp with the only difference being the headers.

I'm willing to do the cam, but it would really suck to spend the $600-700 on the new cam, valve springs and push rods, plus the install and tune and not get what I hope out of it.

I doubt the cats are really an issue power wise. I would've liked to have them flanged or V banded for easy removal, but they're welded in. My tune right now has the rear O2's disabled, so I can pull the cats without an issue.

No way would I disable the knock sensors! That's just insanity! Why would I want to remove something that will keep the motor from self destructing? They don't cause any power loss...

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Re: Long tube headers and FAST 102 intake

Post  xschop on Mon Dec 06, 2010 5:12 pm

Sounds like your weakest link is the primaries. 1 5/8"?
Also remember that High flow cats really don't do a good job of catalyzing the unspent HC's. You may wind up blowing High HC #'s. Have you ran it by the HC-Nox sniffer yet?
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Re: Long tube headers and FAST 102 intake

Post  docwyte on Mon Dec 06, 2010 5:23 pm

I thought the S&P headers had 1 7/8" primary's?

Nope, haven't run through emissions yet, car isn't due for another 1.3 years. They have mobile test vans here on the freeway on ramps and if I pass driving by those I don't need to bring it in to the "real" station to get it tested.

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Re: Long tube headers and FAST 102 intake

Post  Arthropraxis on Mon Dec 06, 2010 5:32 pm

Yours might be 1 7/8" they make both sizes. The original buy that Greg organized were 1 5/8" primaries.
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Re: Long tube headers and FAST 102 intake

Post  Porch on Mon Dec 06, 2010 5:33 pm

The intake shouldn't be an issue on your car. The '01+ cars come with the LS6 intake which is known to support just north of 500hp n/a. Also, the FAST 102mm is WAY too big for an n/a 346 cid engine. A FAST 90mm would be somewhat appropriate, but i doubt you would see more than a few horsepower from it.

As for headers, i'm not really sure what setup the S&P's have, but they looked fine from the pictures i've seen.

I'm guessing your latest dyno didn't turn up any extra power and you also didn't identify any weak cylinders or anything (cylinder balance test results?)? You're certain the throttle is opening 100%?

You might try posting on ls1tech.com. I have to say though: people there are going to say "it's the headers" because you don't have long tubes--but there is no header in the world that will add the 40hp that you're looking for at your current power level. Something else is wrong, or that's just what it's going to make.


Last edited by Porch on Mon Dec 06, 2010 5:43 pm; edited 1 time in total
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Re: Long tube headers and FAST 102 intake

Post  docwyte on Mon Dec 06, 2010 5:37 pm

Seriously? On his website they're listed as 1 7/8"'s. That would really suck if they're 1 5/8"...

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Re: Long tube headers and FAST 102 intake

Post  xschop on Mon Dec 06, 2010 5:39 pm

Got a mic?
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Re: Long tube headers and FAST 102 intake

Post  Porch on Mon Dec 06, 2010 5:46 pm

P.S.--you should check out some of the "free" mods for LS1s. I ported my throttlebody....gave a nice seat-of-the-pants difference Smile
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Re: Long tube headers and FAST 102 intake

Post  docwyte on Mon Dec 06, 2010 5:48 pm

Nope, but I can borrow one. I can measure the OD, but won't know the ID.

Where are the "free" LS1 mod stuff listed?

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Re: Long tube headers and FAST 102 intake

Post  Porch on Mon Dec 06, 2010 5:53 pm

There's a pretty extensive "free" mod list over on ls1tech.com. 95% of them don't apply to us, but it's worth a look. The ported throttle body is probably the most applicable.

Post your dyno sheet!
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Re: Long tube headers and FAST 102 intake

Post  944convert on Mon Dec 06, 2010 6:27 pm

Exhaust tubing is measured with the OD.

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Re: Long tube headers and FAST 102 intake

Post  Arthropraxis on Mon Dec 06, 2010 6:40 pm

His website list both sizes. My set has an ID of 1 9/16ths (as best I can measure). I don't know what that makes the OD. Yours may be different since they were not part of the original order.
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Re: Long tube headers and FAST 102 intake

Post  Marky522 on Mon Dec 06, 2010 8:07 pm

Hey Doc, I have built a set of Long Tube headers for my car. I used 1 3/4 primaries as I plan to go with better heads in the future and will be looking to make 450-500. With my current setup if i fall short of 400 I will be disappointed. The collectors on my headers end almost even with the adapter plate for the TT, I am in the process of finishing them up then i will get some updated pics. It had been asked before if i would be willing to let someone build jigs from them, I would honestly take that as a huge compliment if someone did, and would do anything to assist that goal, but with one stipulation, I NEED to confirm fitment with a stock crossmember, as mine is heavily modified. So baisically, if you could find someone to jig them up and copy them, your more than welcome too!!! Oh BTW that clearance issue i was having in pic 1 has been remidied by cutting the tube in the center and tucking it in tighter to the rest.

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I hope this helps.

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Re: Long tube headers and FAST 102 intake

Post  docwyte on Tue Dec 07, 2010 10:34 am

Porch: Cylinder balance was fine. Didn't turn up any additional power, but made more torque and the same power with 12-14 degrees less advance. Old tune was running 40 degrees of advance.

I've posted on LS1tech and you're right, they're blaming the headers. Although one member with a LS6 is pointing me in the right direction. He has stock exhaust manifolds, high flow cats and stock exhaust and is making just north of 380rwhp.

I figure with the same cam as him, one made to work with a more restrictive exhaust I should make mid 360's with my 241 heads.

Headers are 1 5/8" primary's. I'd love to go with long tubes, let me check into jigging them...

It looks like this is the cam to go with, what do you all think?

Thunder Racing Custom Camshaft
" CheaTR v.3" - 219/230 .607/.604 117 LSA. Off Idle-6800 RPM Power Band. Broad power range. Works well with stock exhaust manifolds and catalytic converters. Stock like idle in 5.7L or Larger. Minor tuning required on automatic transmission cars. Responds very well to nitrous. This cam works well with "Roots style" SuperChargers. Due to the fast ramp rate of this camshaft the use of 1.8 rockers is not recommended. Comp 925/926 Valve Springs are highly recommended.

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