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4" down pipe?
https://cimg2.ibsrv.net/gimg/www.for...ff548def58.jpg https://cimg4.ibsrv.net/gimg/www.for...508681dd81.jpg just in stalled a 4" down pipe. It is louder for sure. Also I seem to have some vibration some where. The bend behind the turbo is up against the fire wall. I don't think I can do anything about that? Just wanted to see if anyone had some advice or ideas about the vibration or anything else. Also there is a tranny pipe that runs right next to the down pipe. Do I need to try and move? Thanks |
This won't really help you but might help others. The general consensus is to get a 3.5" downpipe for these trucks because of the issues you're having. Then a 4" exhaust from the downpipe back fits ok. But due to the issues you're having, a 4" downpipe isn't great. You'll have to decide if you want to change to a 3.5 or fix your issues.
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Loosen the clamp on the turbo and rotate the down pipe until you find the sweet spot then tighten the clamp. I have a 4” turbo back and haven’t had any clearance issues. It’s close to the uppipes but it will fit. What brand did you purchase? That could also be an issue. |
Originally Posted by FiznUKa
(Post 17992715)
Loosen the clamp on the turbo and rotate the down pipe until you find the sweet spot then tighten the clamp. I have a 4” turbo back and haven’t had any clearance issues. It’s close to the uppipes but it will fit. What brand did you purchase? That could also be an issue. |
On the down side....:D the 4 inch offers no benefit, the 3.5 helps with back pressure on the turbo which is necessary and performs better. Stock is 3 inch with a resonator for my 2003. If you want the 4 inch down to fit, you may have to hammer back the pinch welds on the cab to keep it from rubbing.
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Originally Posted by Maxium4x4
(Post 17992868)
On the down side....:D the 4 inch offers no benefit, the 3.5 helps with back pressure on the turbo which is necessary and performs better. Stock is 3 inch with a resonator for my 2003. If you want the 4 inch down to fit, you may have to hammer back the pinch welds on the cab to keep it from rubbing.
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Originally Posted by Maxium4x4
(Post 17992868)
On the down side....:D the 4 inch offers no benefit, the 3.5 helps with back pressure on the turbo which is necessary and performs better. Stock is 3 inch with a resonator for my 2003. If you want the 4 inch down to fit, you may have to hammer back the pinch welds on the cab to keep it from rubbing.
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Originally Posted by tfunk88
(Post 17992875)
So should we go with a 2” downpipe to get more of that turbo performance enhancing back pressure? |
Originally Posted by npccpartsman
(Post 17992884)
Seriously, you're going there?
Do you ha e a link to the Magnaflow testing? I’d be interested in reading it. |
Originally Posted by tfunk88
(Post 17992875)
So should we go with a 2” downpipe to get more of that turbo performance enhancing back pressure? I wouldn't but it is your engine. As an owner you can choose what to do. Introduced in the year of 2003 and the DYNO time I an others have spent since then, my advice is pretty solid but ultimately it is up to you to decide what is right. To clear a 4 inch down you will have to adjust, make room, and live with rubbing if not done correctly. if you are planning on compound turbo's and aiming at 1000+ HP then the 3.5 down may not apply. I and other members only offer advice, the final out come is in your hands. |
Originally Posted by Maxium4x4
(Post 17992897)
I wouldn't but it is your engine.
As an owner you can choose what to do. Introduced in the year of 2003 and the DYNO time I an others have spent since then, my advice is pretty solid but ultimately it is up to you to decide what is right. To clear a 4 inch down you will have to adjust, make room, and live with rubbing if not done correctly. if you are planning on compound turbo's and aiming at 1000+ HP then the 3.5 down may not apply. I and other members only offer advice, the final out come is in your hands. |
Back to the subject on hand another option would be to mark the pipe with it installed and pull it back out and flatten it with a hammer wherever needed. |
Originally Posted by tfunk88
(Post 17992899)
On the dyno the 3.5” pipe outperformed the 4”? That’s definitely interesting. And no, I’m not being sarcastic. |
Originally Posted by FiznUKa
(Post 17992912)
Back to the subject on hand another option would be to mark the pipe with it installed and pull it back out and flatten it with a hammer wherever needed. |
Im not sure how back pressure would have any bearing on the VGT operation? I have had 4" AFE turbo back exhaust for many years now. My truck runs great. I pull a heavy Toyhauler without issue. I think the larger down-pipe is an excellent mod.
As stated earlier, just loosen the clamp and re-position. Also, keep the tranny lines from touching it. |
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