Help me choose turbo setup!
11-07-2009, 12:07 PM
#1
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Help me choose turbo setup! I want you guys opinion on what setup i should use.
I have bought a LSX 427 with TFS 235 CNC heads. I already have a PT91 G-trim turbo, but itīs going to be too small.
1: Upgrade to a 98mm G-trim
2: Twin PT67 or PT71 billet turbos
I want to make 1600-1700 hp with as fast spool as possible.
Twin would be better so i can fit my water intercooler and tanks in the front of the car.
I have bought a LSX 427 with TFS 235 CNC heads. I already have a PT91 G-trim turbo, but itīs going to be too small.
1: Upgrade to a 98mm G-trim
2: Twin PT67 or PT71 billet turbos
I want to make 1600-1700 hp with as fast spool as possible.
Twin would be better so i can fit my water intercooler and tanks in the front of the car.
11-07-2009, 12:15 PM
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FormerVendor
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i would def go with the twins-the 67's would be a little on the small side.The 71's would be a much better match.your camshaft will determine the spool up speed more than anything else.
11-07-2009, 12:58 PM
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PT67 billet works perfect on euro engines and have made 750 whp. With the T4 0.96 housing i think they would work nice on my new engine.
My cam is a 248/252 with 0.650" lift and 115 lobe.
My cam is a 248/252 with 0.650" lift and 115 lobe.
11-07-2009, 01:35 PM
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just because it made 750rwhp on one engine,doen't mean it will on every engine.You really need to calculate your lbs per min vs pressure ratio and look at the turbo map-the large engine will run at a much lower PR and require a larger turbo.you also need to consider exhaust backpressure into this equation.
11-07-2009, 01:46 PM
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I know. I work with this all day
But not with V8:s ...
A 67 billet on a supra 3 lit makes 750 whp easy without backpressure. And a 427 cui is 7 lit. So i think it would make 1600 flywheel hp with T4 0.96 housing at 22-28 psi because i know they flow so much at that boost level.
But it would be easier with larger turbos, but i really want the spool.
But not with V8:s ...A 67 billet on a supra 3 lit makes 750 whp easy without backpressure. And a 427 cui is 7 lit. So i think it would make 1600 flywheel hp with T4 0.96 housing at 22-28 psi because i know they flow so much at that boost level.
But it would be easier with larger turbos, but i really want the spool.
11-07-2009, 02:39 PM
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No i havenīt. Thatīs why i wanted to listen to you pro:s that already have tested this kind of setups..
Iīm afraid that it will be difficult to have a converter made for twin 71mm.
I donīt live in US so itīs hard for me to get it re-stalled.
Iīm afraid that it will be difficult to have a converter made for twin 71mm.
I donīt live in US so itīs hard for me to get it re-stalled.
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11-07-2009, 04:39 PM
#10
just because it made 750rwhp on one engine,doen't mean it will on every engine.You really need to calculate your lbs per min vs pressure ratio and look at the turbo map-the large engine will run at a much lower PR and require a larger turbo.you also need to consider exhaust backpressure into this equation.
I sure would like to see one for a PT88.
11-07-2009, 05:09 PM
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Iīm a world distributor for Precision turbo here in sweden. So i have been able to test a lot of cars in my dyno. But iīm quit new in V8:s so thatīs why iīm asking here.
11-07-2009, 05:17 PM
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IMO the 71's will work much better with your setup-like i stated before the camshaft will dictate the spool more than turbo size-i can tell you that the camshaft specs you posted will not give you the results you want.
you really can't compare a 3.0 inline 6 to a 7.0 v8,the long stroke of the v8 will make a ton more tq which greatly helps with spool.
you really can't compare a 3.0 inline 6 to a 7.0 v8,the long stroke of the v8 will make a ton more tq which greatly helps with spool.
11-07-2009, 05:34 PM
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I had this camshaft in my old 6.0 lit LQ9 with stock heads. I dynoed 1360 hp and ran 8.03 as best. I had power peak at 7200 rpm with that setup and it spooled very nice with my 91mm G-trim. But maybe i should listen to you and order a new camshaft from you. I will send you a pm about that with my new engine spec.
11-08-2009, 10:17 AM
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It was a stock crank and 4" bore and 28 psi.
Here are some vids:
http://www.youtube.com/watch?v=qkxtDLQIsEA
http://www.youtube.com/watch?v=y2jeViRTC3E
Here are some vids:
http://www.youtube.com/watch?v=qkxtDLQIsEA
http://www.youtube.com/watch?v=y2jeViRTC3E
11-08-2009, 07:27 PM
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Like I said, for that much power the 71mm will work better. The 6765 is great on Supras, I know a couple guys making 850whp, but those are very efficient motors and with very high boost you increase the efficiency greatly. A 427 wont be as efficient and you wont squeeze as much power from it. You may be able to make 1500 with the 67's, but you will be running them near the limit all the time.
