Headers vs Truck manifold vs Log?
Headers vs Truck manifold vs Log? Manifolds and logs are cast which is strong but heavy and they don't flow well. Headers flow well but when wrapped I heard they can fail, but stainless has a better chance of survival.Given an option on a twin turbo setup which would you choose? I have all stainless running to my turbos and planned on wrapping them with DEI Titanium wrap. I am running e-85 with an air to air intercooler and water cooled twin turbos. Just making every effort to keep temps down and flow at its highest.
This is good advice. Their are stock truck manifolds making 1100+ hp. I am running 5th gen manifolds and have hopes of 1000hp. Tube headers are nice, expensive, but not necessary. They look better and might flow better, but really haven't been proven side by side to be worth the expense. If the build is a budget then manifolds are in order, if no budget, then by all means, turbo headers.
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From: Norn Iron
I would disagree that header choice is irrelevant. I'm sure it very much can make a difference. Whether it is enough difference and a difference in the area you want is another matter. And again at what cost.
The smaller port sizes and short design of typical cast manifolds will give more chance of fast spool.
I guess depending on turbo choice and cam choice there will be a point when tubular headers will make more power more easily.
Where that line is, and when you will reach it is again another matter.
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I am! Hahahaha. My friend with an 06 Ford GT, just dyno'd at 1500rwhp. I know he is more aerodynamic, but in a quarter I want to beat him. If I have to end up getting an aftermarket block and add even more displacement to do so, so be it.
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From: Norn Iron
That's going to be one very difficult car to beat. The only real advantage you'll have over a 1/4 is if you can find lots of traction and an auto trans as well as huge amounts of power.
If you already have the install done, clearly you have plenty of room for those tubular versions. So what is the real reason behind the question ?
I would disagree that header choice is irrelevant. I'm sure it very much can make a difference. Whether it is enough difference and a difference in the area you want is another matter. And again at what cost.
The smaller port sizes and short design of typical cast manifolds will give more chance of fast spool.
I guess depending on turbo choice and cam choice there will be a point when tubular headers will make more power more easily.
Where that line is, and when you will reach it is again another matter.
I would disagree that header choice is irrelevant. I'm sure it very much can make a difference. Whether it is enough difference and a difference in the area you want is another matter. And again at what cost.
The smaller port sizes and short design of typical cast manifolds will give more chance of fast spool.
I guess depending on turbo choice and cam choice there will be a point when tubular headers will make more power more easily.
Where that line is, and when you will reach it is again another matter.
He weighs a little more then I do, which I was surprised, and running a street tire but it is super wide. Claims it is not setup for drag racing.
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From: Norn Iron
I would say that if cost etc was not an issue, low rpm spool not an issue, then yes you would be better with a good set of equal length tubular headers into a nice merge collector.
They will make more power with less boost. The next question will be tube diameter and length. That's probably an even bigger question than the first one.
They will make more power with less boost. The next question will be tube diameter and length. That's probably an even bigger question than the first one.
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From: Norn Iron
Well, I feel that I will have weight transfer as an advantage. I am running a 4l80e and will be running drag radials, still have to tub for max width. and as far as huge power I was hoping to hit four digits with a 408, twin billet turbos, comp custom cam, and heads that flow in the 340-350 range.
He weighs a little more then I do, which I was surprised, and running a street tire but it is super wide. Claims it is not setup for drag racing.
He weighs a little more then I do, which I was surprised, and running a street tire but it is super wide. Claims it is not setup for drag racing.
That's seriously fast. It may not be set up for drag racing, but it's still going to be bloody fast.
Your's will very much need to be set up for drag racing. The auto trans will make a huge difference I'd think though. But either way, you'll still need a similalr power level to him I'd imagine.
You have some weight transfer. But the GT already has most of the weight where it matters. And if it has that sort of power...it must be trapping 170-180mph over a 1/4 ?
That's seriously fast. It may not be set up for drag racing, but it's still going to be bloody fast.
Your's will very much need to be set up for drag racing. The auto trans will make a huge difference I'd think though. But either way, you'll still need a similalr power level to him I'd imagine.
That's seriously fast. It may not be set up for drag racing, but it's still going to be bloody fast.
Your's will very much need to be set up for drag racing. The auto trans will make a huge difference I'd think though. But either way, you'll still need a similalr power level to him I'd imagine.
Found this...
http://www.turbobygarrett.com/turbob...ngth_manifolds
Basically states that cast manifolds will spool faster but headers will make a lot more power. With .68 a/r's not really worried about turbo lag, as my car at idle I put my hand over my bell mouths and can just feel the air sucking! Also this is with a 3" mid pipe. Doesn't help with spool but should help with EGT's even though I am running e-85.
http://www.turbobygarrett.com/turbob...ngth_manifolds
Basically states that cast manifolds will spool faster but headers will make a lot more power. With .68 a/r's not really worried about turbo lag, as my car at idle I put my hand over my bell mouths and can just feel the air sucking! Also this is with a 3" mid pipe. Doesn't help with spool but should help with EGT's even though I am running e-85.