02'Z71ONDUBZ'

iTrader: (8)

I realize this, the reasoning behind my turbine housing having a 3.5" v-band going into a 4" exhaust on the little old 5.3. Key word in my post was relative. I want to know which would increase BP more, a smaller turbine or 3" down pipe going into a 3" catback. A hell of alot of turbo guys on here are very content with their 3" exhaust.

TrickTurbo

iTrader: (12)

To many combos.
What is good for one might not be for another.
Is the engine stock, mild modied, heavy modied, race.
Budgets come into play.
To run a 4" DP or 5" DP is just not cost effective for most
people. And complicates the fit.
Customers have made 700 to the ground with a 3" DP.
( no exhaust just dumping)
Would they have made more with a 3.5 or 4.0
Hard to say, but the turbine outlet flange was 3". So it's ID was around 2.5.
2-1 or under is not bad.
The only way to really tell if it helps The customer.
Dyno make an a/r or DP swap. Dyno again.
Compare the results, did it help?
Does spending money to lower BP help the final Horsepower to warrant that expence.

Swapping to a larger frame turbo, and DP for a comparison is not good testing.
It should lower the BP it's a bigger frame/ar.

Flex joints popping. Use a interlocking liner.
Not a flex liner, thats asking for trouble.
A interlocking liner is set up for turbo.
You have three main choices in couplers liner.
Flex liner= junk. Waiting for a problem.
Inside looks like the outside.
No liner = most budget kits use this one. Inside looks like convoluted tubing.
Interlocking liner= made for turbos. It looks like flex exhaust pipe stuff on the inside. Doesn't flex as much as no liner. We use this one on all stage 4 and higher kits.