GTRPWR Forums  

Go Back   GTRPWR Forums > General > Tech Discussion


Reply
 
Thread Tools Display Modes
Old 12-03-2012   #1
BNR32 Nismo
RB20E
 
Join Date: Feb 2010
Location: Chch, NZ
Posts: 13
My Ride: R32 Nismo Edition
iTrader: (0)
Default Ideal length for wastegate pipe in split dumps?

Hi folks, am currently getting custom split dump pipes made for R32 GTR and wondering what the optimal length for divided split dumps would be? I won't be re-using my Trust front pipe so there is no need to have wastegate pipes joined back in before the first flanges. Planning to merge with a taper so that the two flows don't intersect at 90deg. I was thinking of going around 12-18" from turbine flange before merging them back in? I have plenty of pipe and bends to play with and a talented welder/fabricator at my disposal... Could potentially go right to the diff, or further, with all four pipes if I was convinced it was going to provide more power... (Turbos are custom hybrid t25/T28's and are sized to flow around 550-600hp and other mods should safely support this figure).

Anyone have any experience with various lengths? (or even better some dyno comparisons etc?)

Thanks in advance,
Darcy
BNR32 Nismo is offline   Reply With Quote
Old 01-06-2013   #2
christ.deyoung
RB25DE
 
christ.deyoung's Avatar
 
Join Date: Aug 2009
Location: Nova Scotia, Canada
Posts: 240
My Ride: BNR32
iTrader: (0)
Default Re: Ideal length for wastegate pipe in split dumps?

Down to the ground, equal length, atmospheric dump
christ.deyoung is offline   Reply With Quote
Old 01-06-2013   #3
BNR32 Nismo
RB20E
 
Join Date: Feb 2010
Location: Chch, NZ
Posts: 13
My Ride: R32 Nismo Edition
iTrader: (0)
Default Re: Ideal length for wastegate pipe in split dumps?

Sounds good! So four pipes exiting just below the passengers feet? Wouldn't hurt power either I'd say! The local authorities may take a dimmer view of it though....
BNR32 Nismo is offline   Reply With Quote
Old 01-06-2013   #4
christ.deyoung
RB25DE
 
christ.deyoung's Avatar
 
Join Date: Aug 2009
Location: Nova Scotia, Canada
Posts: 240
My Ride: BNR32
iTrader: (0)
Default Re: Ideal length for wastegate pipe in split dumps?

Why 4 pipes?

And I don't find it to be overly loud just be careful where you get into it.
christ.deyoung is offline   Reply With Quote
Old 01-06-2013   #5
BNR32 Nismo
RB20E
 
Join Date: Feb 2010
Location: Chch, NZ
Posts: 13
My Ride: R32 Nismo Edition
iTrader: (0)
Default Re: Ideal length for wastegate pipe in split dumps?

...sorry thought you meant dump pipes & wastegate pipes all terminating just above ground level (hence the four pipes). Was first thing in the morning here - makes more sense now that I've re-read it with caffeine onboard

I'll definately put a flange where the wastegate pipe joins back in to the exhaust so that I can run the wastegates to atmosphere (illegal here but cars only have to be tested every 6-months so I'll just make them easy to plumb back in when needed)
BNR32 Nismo is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT -7. The time now is 07:04 PM.


Design By: Miner Skinz.com
Powered by vBulletin®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.