home grown turbo build
home grown turbo build Stock radiator and fans. Still fighting the down pipe..not sure what to do and running about 18-24 inches of pipe and dumping it as of right now.
As much power as i can w what i have. just trying to make whats there as efficient as possible. How do you come up w 3" is good to 850? My original plan was all the back through my magnafow exhaust. What i have to go by is the math i found doing my research, down pipe should be 120-130% of the exducer and that puts me 3.5"@120% or 4"@130%
Trending Topics
Numerous people have made big power through a 3" downpipe. I put down 606/570 with an on3 turbo on 14 lbs. I now have a Turbonetics 7875 on 16-17 lbs. and it runs pretty well. I would dare to venture I am close to 700 rwhp now through a 3" downpipe.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
TECH Enthusiast
Joined: Mar 2012
Posts: 728
Likes: 3
You can make tons of power on a 3" setup. Around 750 at the flywheel it'll start causing some issues with back pressure.
This doesn't mean that you won't make more power with a larger exhaust, because you will. It just means that power can still be made. With a 3" turbine outlet, I picked up 50 whp going from 3" to 4" (cone coming directly off of the v-band flange) in a relatively low power setup.
The longer and more bendy the exhaust, the more power that will be lost with a smaller diameter pipe. If you have a straight dump coming off of the turbine, the gains wouldn't be nearly as big going up to a 4" as they would be if it was a full length exhaust with mufflers.
This doesn't mean that you won't make more power with a larger exhaust, because you will. It just means that power can still be made. With a 3" turbine outlet, I picked up 50 whp going from 3" to 4" (cone coming directly off of the v-band flange) in a relatively low power setup.
The longer and more bendy the exhaust, the more power that will be lost with a smaller diameter pipe. If you have a straight dump coming off of the turbine, the gains wouldn't be nearly as big going up to a 4" as they would be if it was a full length exhaust with mufflers.
I trust in real world testing and i like the idea of solid mounts for extra clearance. As of now im working on a 3.5" two 90s w a offset through the k member past the starter and straight pipe back to the axle wwhere i will pick up the 3" and have a cut out for the track etc.
On The Tree
Joined: Apr 2005
Posts: 187
Likes: 0
From: Sylvester, ga
Since your alternator is moved up, if you went with some spohn tubular solid motor mounts how much room would you have routing it there? Wondering if you could get a 3 inch between the motor mounts and the block?
Right now i have a 3.5" in there but its really tight. Im worried about getting knock retard from it rattling so. Ive heard that the solid mounts make it pretty loud inside on a street car. Anyone have any input on this that have them installed?
On The Tree
Joined: Apr 2005
Posts: 187
Likes: 0
From: Sylvester, ga
I was talking about on the drivers side. Looking to route a charge pipe from a rear mount up to the front. just wondering if I could get a 2.5" pipe somewhere amongst the steering shaft, tubular mount, or block if the alternator is moved out of the way.
