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AircooledB4itwascool
Join Date: Jan 2006
Location: Barrington Hills, IL
Posts: 401
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Another thing I forgot to mention, I saw a few people recommending re-grinding your cams. I would steer clear of this. I believe you will see great results with the stock cams.
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Registered User
Join Date: May 2007
Location: Collegeville, PA
Posts: 1,367
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What size turbine and compressor housings would you recommend for my setup? Do you have a specific model number? Is that something I could purchase from AMS? Quote:
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Thanks for the plug on the Carrera Cams!
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Andy - 1987 911 Carrera Coupe |
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AircooledB4itwascool
Join Date: Jan 2006
Location: Barrington Hills, IL
Posts: 401
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I'd recommend a turbo we call the 850R. It has a 62mm compressor wheel and 62mm turbine wheel with a .68 T4 exhaust housing. This is just a minuscule amount larger than a 35R and has no difference in spool. It also has a billet compressor wheel and the oil cooled center section. This turbo I'm mentioning is built completely built by Precision turbo in house. We have run these on hundreds of turbo kits and can honestly say that they reliably make consistent power.
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Registered User
Join Date: May 2007
Location: Collegeville, PA
Posts: 1,367
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Quote:
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Andy - 1987 911 Carrera Coupe |
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AircooledB4itwascool
Join Date: Jan 2006
Location: Barrington Hills, IL
Posts: 401
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The 850R is a ceramic ball bearing unit. The .68 T4 housing will be more than enough to achieve the power you're looking for. I dont think you will have any trouble making 500WHP at 1.0-1.2BAR. |
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Crotchety Old Bastard
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T3 vs T4 Flange
We just finished a custom T4 setup and I set it next to a standard T3 to emphasize the difference. Both of these flanges shown are split plenum. You can see how much larger the T4 is and how sizing will affect velocity and flow. You need a pretty high output engine to properly utilize the T4 flange.
![]() This is the T4 system. Fully split system with a waste gate for each bank and 1.625" primaries will support big power. ![]()
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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Registered User
Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
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That is a nice one Brian!
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Registered User
Join Date: May 2007
Location: Collegeville, PA
Posts: 1,367
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I'm curious to hear your thoughts. I'll ask Tony when he reached full boost.
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Andy - 1987 911 Carrera Coupe |
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AircooledB4itwascool
Join Date: Jan 2006
Location: Barrington Hills, IL
Posts: 401
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The T3 vs. T4 debate has been going on for a long time. You have to understand that you're working with 6 cylinders that produce a lot of exhaust flow. Utilizing the .68 T4 hot side, you would see almost no difference from a T3 housing in spool time. You would however see considerable gains in the upper RPM range. Also, with the new technology being incorporated, you are able to see improved spool time a bigger HP numbers. Billet compressor wheels are not only lighter, which helps quicken spool time, but they also have superior aerodynamic profiles that compress more air efficiently: less heat = more power. Ceramic ball-bearing center sections are more durable, have less friction, and don’t require coolant unlike the original traditional ball-bearing units.
Last edited by Frank@AMS; 11-02-2010 at 05:00 AM.. |
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Registered User
Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
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What he said!
Also, I suspect that with a T3 the tubing area cross section leading the turbine on the aftermarket headers can be quite a bit larger than the T3 inlet's cross section area. Thus, the tubing has to taper down significantly before the turbo and very quickly. On a T4 the taper and acceleration of exhaust gasses happens more in the turbine housing and in a more orderly manner. This is a guess. |
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Crotchety Old Bastard
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It is not complicated but rather a simple matter of economy of scale. A high output engine blows a lot more air than a lower output engine therefore needs more room to do it while maintaining similar characteristics of flow and velocity.
Your 500+WHP engine can well utilize the T4 flange and larger piping in order to flow well on the top end.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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Registered User
Join Date: May 2007
Location: Collegeville, PA
Posts: 1,367
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I was just over on the Honda Tech forums, and they were saying that these new ceramic ball bearing turbos (such as the AMS 850, aka Precision HP6262) are actually considered air cooled, since the water inlet and outlet have been removed. Here's a quote from Precision:
Quote:
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Andy - 1987 911 Carrera Coupe |
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Registered User
Join Date: May 2007
Location: Collegeville, PA
Posts: 1,367
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What turbo was installed on Tony's car when he was running the single turbo setup? In talking to Precision it sounds like there is a whopping $600 difference between the journal and ball bearing version of the 850R. Is there $600 worth of difference? When do you think full boost would be achieved on carrera cams with ball bearings versus journal bearings?
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Andy - 1987 911 Carrera Coupe |
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