Which wastegate to choose? - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

WOW MAN · 1st August 2006, 04:18 AM

Hello, I have a single big T88 turbo, now I have been told my wastegate is too small for my turbo.
Could someone help me out and let me know on how to choose a wastegate and which wastegate would suit a high boosting GTR with a single T88 turbo.
Thks for any help

R.I.P.S NZ · 8th August 2006, 02:30 AM

Pro-gate 48mm externals are good, we use them all the time, they have been tested to over 1000hp and are very well priced. e-mail me if you want some more info...Rob

Warpspeed · 8th August 2006, 08:50 AM

The answer is, at what Rpm does the engine reach full boost, and what is the engine redline ?

That should tell you very roughly how much exhaust flows through the turbine, and how much exhaust flows through the wastegate flat out at redline Rpm.

You should then be able to figure out the effective flow area through the turbine housing, and estimate (very roughly) the minimum flow area required through the wastegate required to do the job.

For instance if your engine only just reaches full boost at redline, no wastegate is required.

If your engine reaches full boost at exactly half redline Rpm, flat out turbine and wastegate will need to share the total flow 50/50. That is not strictly true, but it will come mighty close.

An even rougher way to do it is just look down the throat of the snail and look at the wastegate hole and judge the relative flow areas of both by eye.

Not very scientific, but it will either look about right, or be miles out, you decide...

toddrb30gtr · 8th August 2006, 09:28 AM

Quote:

Originally Posted by R.I.P.S NZ

Pro-gate 48mm externals are good, we use them all the time, they have been tested to over 1000hp and are very well priced. e-mail me if you want some more info...Rob

yep the TURBOSMART PRO-GATE is the way to go,,,,,,never had a problem with them

1st August 2006, 04:18 AM	#1 (permalink)
WOW MAN GTR Register Member Join Date: Oct 2004 Location: DUBAI Posts: 39	Which wastegate to choose? Hello, I have a single big T88 turbo, now I have been told my wastegate is too small for my turbo. Could someone help me out and let me know on how to choose a wastegate and which wastegate would suit a high boosting GTR with a single T88 turbo. Thks for any help

8th August 2006, 02:30 AM	#2 (permalink)
R.I.P.S NZ GTR Register Member Join Date: May 2004 Location: Rotorua NZ Posts: 2,323	Pro-gate 48mm externals are good, we use them all the time, they have been tested to over 1000hp and are very well priced. e-mail me if you want some more info...Rob __________________ R34 GTR: Quickest full street trim skyline in NZ, 9.7 @ 137 on 1st test pass, first meeting in the UK, 10.4 @ 144. RIPS 240z, WRH8.36 / 163 @ 1.9 bar, stock crank, stock block, petrol RIPS 240z, RIPS RB30, quickest/fastest Jap street car in NZ 8.36/163mph 1.9 bar. NZs quickest Pro Import on petrol. RB engine building, alloy and stainless fabrication, affordable skyline tuning and high capacity repowers, worldwide shipping arranged. e-mail rips@inspire.net.nz www.ripsracing.com

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8th August 2006, 08:50 AM	#3 (permalink)
Warpspeed GTR Register Member Join Date: Apr 2003 Location: Melbourne Australia Posts: 169	The answer is, at what Rpm does the engine reach full boost, and what is the engine redline ? That should tell you very roughly how much exhaust flows through the turbine, and how much exhaust flows through the wastegate flat out at redline Rpm. You should then be able to figure out the effective flow area through the turbine housing, and estimate (very roughly) the minimum flow area required through the wastegate required to do the job. For instance if your engine only just reaches full boost at redline, no wastegate is required. If your engine reaches full boost at exactly half redline Rpm, flat out turbine and wastegate will need to share the total flow 50/50. That is not strictly true, but it will come mighty close. An even rougher way to do it is just look down the throat of the snail and look at the wastegate hole and judge the relative flow areas of both by eye. Not very scientific, but it will either look about right, or be miles out, you decide...