3" Downpipe limitations on 6.0
3" Downpipe limitations on 6.0 Curious if anyone has really pushed a 3" dp and a 76/75 turbo on a 364 ci engine. It seems like they'll go Lil further on a smaller engine. Guesstimating that I'm around 800 rw running 141 @ 3750 lbs. I really like my full exhaust to the axle and don't wanna do a fender exit. Seen some people run a bigger dp through stock k as well but I prolly would need a large frame turbo to really benefit.
TECH Junkie
Joined: Jul 2015
Posts: 3,012
Likes: 48
Curious if anyone has really pushed a 3" dp and a 76/75 turbo on a 364 ci engine. It seems like they'll go Lil further on a smaller engine. Guesstimating that I'm around 800 rw running 141 @ 3750 lbs. I really like my full exhaust to the axle and don't wanna do a fender exit. Seen some people run a bigger dp through stock k as well but I prolly would need a large frame turbo to really benefit.
I believe it's close to 800, 780 no doubt. Made 700 on prior setup and ran 131. Just doing lil math and using some calculators and seems to be close to 800. She's pretty heavy so that don't help. But none the less, if losing weight was easy I'd just do that. But I'm gonna add a roll bar so gonna have to add some power since the weight is so hi.
Staging Lane
Joined: Jun 2015
Posts: 96
Likes: 3
From: Melbourne, Australia
I saw an interesting thread on an Evo forum about a guy who had reached the limit of what he could flow through his dump pipe, so he added a wastegate to it, which he could run in a more convenient location, and plumbed it up so it would only open under boost anyway.
The end result was more total exhaust flow, but he didn't have to cut up the car or put up with any more noise when driving normally.
The end result was more total exhaust flow, but he didn't have to cut up the car or put up with any more noise when driving normally.
Staging Lane
Joined: Oct 2016
Posts: 62
Likes: 7
From: Connecticut
I saw an interesting thread on an Evo forum about a guy who had reached the limit of what he could flow through his dump pipe, so he added a wastegate to it, which he could run in a more convenient location, and plumbed it up so it would only open under boost anyway.
The end result was more total exhaust flow, but he didn't have to cut up the car or put up with any more noise when driving normally.
The end result was more total exhaust flow, but he didn't have to cut up the car or put up with any more noise when driving normally.
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Why not just run a loud valve and set it for x boost vs another wastegate? Isn't it basically doing the same thing? It would certainly flow better. The loud valve would be cheaper than a decent wastegate, but I guess not a Chinese copy. To me, at that point, it's splitting hairs.
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I'm currently running a 3" down pipe into a full 3" crimp bent exhaust with the biggest Magnaflow I can fit in the stock location.
Its very quiet which is great for cruising but is definitely choked up.
I added a 3" QTP Electric Cutout right under the driver floor board under my feet and it made a huge of difference.
I don't have any dyno figures yet but when its open its like having a higher boost setting lol.
I feel like if you run the cutout down stream from the turbine a bit your not hitting it with that super hot exhaust and it may extend its life. $.02
Its very quiet which is great for cruising but is definitely choked up.
I added a 3" QTP Electric Cutout right under the driver floor board under my feet and it made a huge of difference.
I don't have any dyno figures yet but when its open its like having a higher boost setting lol.
I feel like if you run the cutout down stream from the turbine a bit your not hitting it with that super hot exhaust and it may extend its life. $.02
Staging Lane
Joined: Oct 2016
Posts: 62
Likes: 7
From: Connecticut
Why not just run a loud valve and set it for x boost vs another wastegate? Isn't it basically doing the same thing? It would certainly flow better. The loud valve would be cheaper than a decent wastegate, but I guess not a Chinese copy. To me, at that point, it's splitting hairs.
That said, I bought 2 roudvarves on Aliexpress and put one in each downpipe in the LS :/