Has anyone attempted this?
Thread Starter
TECH Senior Member
Joined: Nov 2001
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Has anyone attempted this? Has anyone attempted dual log manifolds into a single or a twin turbo setup? (say 1 3/4 primaries into 3 inch log into each turbo)
Then going from going from dual 3 inch into single 3 or 3.5 inch pipe into a front mount intercooler.
It would be cheaper than full tubular manifolds, and still flow very well.
If you wanted to do single turbo you could do two log manifolds with the piping coming forward and merging into a single 3 inch pipe right at the turbo. You wouldn't have the backpressure issues like with the QTP and other crossover style kits and it would be cheap to make the logs plus you could route them exactly how you wanted.
You could also do dual 3 inch log with 1 3/4 primaries smoothly transition each pipe down to 2.5 inches, merge into a single 3 inch pipe into the turbo.
Thoughts?
It would knock a lot of time off fabrication that is for sure.
Cheers,
Chris
Then going from going from dual 3 inch into single 3 or 3.5 inch pipe into a front mount intercooler.
It would be cheaper than full tubular manifolds, and still flow very well.
If you wanted to do single turbo you could do two log manifolds with the piping coming forward and merging into a single 3 inch pipe right at the turbo. You wouldn't have the backpressure issues like with the QTP and other crossover style kits and it would be cheap to make the logs plus you could route them exactly how you wanted.
You could also do dual 3 inch log with 1 3/4 primaries smoothly transition each pipe down to 2.5 inches, merge into a single 3 inch pipe into the turbo.
Thoughts?
It would knock a lot of time off fabrication that is for sure.
Cheers,
Chris
Originally Posted by CHRISPY
Then going from going from dual 3 inch into single 3 or 3.5 inch pipe into a front mount intercooler.
http://harlan-engineering.com/tt_lt1/
the white TT car is kinda similar, if you can call stock cast manifolds logs.
Same idea anyway
the white TT car is kinda similar, if you can call stock cast manifolds logs.
Same idea anyway
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On The Tree
Joined: Jul 2005
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From: Houston TEXAS
I'm guessing no ones builds exhauste manifolds/headers like this on Natural Aspirated cars is because there's no scavenging effect, (that turbo cars don't care to much about).
What would happen if I used a set of log type headers on a NA car.
http://harlan-engineering.com/tt_lt1/
What would happen if I used a set of log type headers on a NA car.
http://harlan-engineering.com/tt_lt1/
Originally Posted by CHRISPY
BTW That picture of Kramer is CLASSIC!!! 
BTW check your PMs
BTW check your PMs
Thats what happens when a guy buys "Art" without consulting the old lady, one look and its hanging out in the garage behind the tool box
Kind of like that commercial with the guy who hangs the 70's big fro black karate master picture on the wall and his wife makes him **** can it!!
IMO you're gonna need to fab up some sort of bracket to support the turbos weight so the manifolds dont crack. You're also gonna have to lay down some really nice fat welds.
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Joined: Nov 2001
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From: Austin, TX
You should see the thickness of the stainless used though. It will support those turbo's no problem. All these log manifold builders make the mistake of thinking they can use THIN 304 stainless and it will take the abuse. That's dumb. Bottom line, you are not going to add that much more weight by using a big *** schedule 10 or 40 or whatever weld-el.
Thread Starter
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Originally Posted by GMC SKI
So how much power did the setup make ?
Do you think you lost huge amounts of power going with the logs ?
Do you think you lost huge amounts of power going with the logs ?
I believe they ran 8s@155mph plus on the log setup but I am not positive
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From: Austin, TX
Originally Posted by CHRISPY
I believe they ran 8s@155mph plus on the log setup but I am not positive
I heard about a guy running low 9's on some logs on a BBC in a second gen camaro. I dont have any pics, though.
The 6.0 manifold setup ran 8.84@155
The log manifold car has been over 700 rwhp at 15psi, mild 355 LT1 build, 230ish hydraulic cam, AFR headed, LT4 intake. it's been in the 10's with the 6 speed, but the owner isn't a huge drag racer. Thus the reason the exhaust has been toned down some, and it rarely sees a sticky tire.
Those logs are schedule 10 304 if memory serves. The runners were .125"+ thick and the log itself is over .25" wall. Heavy **** Strong though. Been on the car over 3 years now (i think it's close to that long) no cracking.
The log manifold car has been over 700 rwhp at 15psi, mild 355 LT1 build, 230ish hydraulic cam, AFR headed, LT4 intake. it's been in the 10's with the 6 speed, but the owner isn't a huge drag racer. Thus the reason the exhaust has been toned down some, and it rarely sees a sticky tire.
Those logs are schedule 10 304 if memory serves. The runners were .125"+ thick and the log itself is over .25" wall. Heavy ****
Strong though. Been on the car over 3 years now (i think it's close to that long) no cracking.