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Doug Siegel
 
Join Date: Oct 2007
Location: Bloomington, IN
Posts: 314
quick spool turbo

For those of you who have chosen a turbo, cams, and countless other tricks to gain low end boost, I'm curious as to what RPM your boost is "all in"?

Anyone with a GT35R all in by 3000 rpm and pushing 500hp?

I hear rave reviews about the K27HFS, but that it maxes at 400 hp.

Has anyone compared these 2 turbos?

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88' blk/blk 930: Haltech EFI, Twin Plug, Pauter Rods, Nascar Bearings, custom crank work, dowel pinned case, ported manifold and heads, Kokeln I/C, SC Cams, Turbonetics ball bearing 62-1, BB headers, RARLYL8 Zork, additional 993 oil filter, plx/inyourface gage, RS style coilover, Fikse FM10-17 wheels, TIAL 46mm 1 bar. (where the heck did all my money go?)
Old 07-24-2009, 09:58 PM
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Well, I dont know what RPM mine will be at when its at full boost, but I will have Rarly8 equal length headers, Tial's GT-35r, and Zork tube for an exhaust. GT-2 EVO cams, stroked and jugged to a 3.6L, 8/1 CR, with a full bay I/C and 3.2L intake, EFI....... I should be well under 3 grand when it reaches full boost. I hope to be in the 600HP range...we will see...

FWIW, when I was still CIS, I had the Kokeln I/C, Euro fuel system, 1.0 bar spring, crank fire ignition, headers, Zork tube, and the turbo was from TPC. It was their answer to the KKK turbos... it was called a T-36s2..... full boost was 2400 to 2500 RPM.... That thing kicked ass, until I spun two rod bearings....
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Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-3584RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk
Old 07-24-2009, 10:16 PM
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Crotchety Old Bastard
 
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Doug, the K27HFS supports 400whp on a CIS engine. The reason for that is CIS cannot support more fuel/HP without above-average modification, which has nothing to do with the turbo. On an EFI engine like yours the HFS will support 500+HP at the wheels. Sorry for that confusion.
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Old 07-25-2009, 07:06 AM
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Quote:
Originally Posted by dsiegel360 View Post
For those of you who have chosen a turbo, cams, and countless other tricks to gain low end boost, I'm curious as to what RPM your boost is "all in"?

Anyone with a GT35R all in by 3000 rpm and pushing 500hp?
GT35r on an EFI car hitting 500hp is realistic.

You also need to ask full boost in what gear. Guys selling turbos to new buyers say they get full boost at 2100 rpm. Until you find out that is 3rd or 4th gear and you're disappointed on your first pull in first gear and you're only getting 2800 (and that's optimistic in a nearly stock motor). I get 1 bar around 2600 - 2800 rpm in first and full bar at 2100 in 3rd and 4th (EFI car).
Old 07-25-2009, 08:22 AM
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Doug Siegel
 
Join Date: Oct 2007
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Well, that answers that!
Thanks.
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88' blk/blk 930: Haltech EFI, Twin Plug, Pauter Rods, Nascar Bearings, custom crank work, dowel pinned case, ported manifold and heads, Kokeln I/C, SC Cams, Turbonetics ball bearing 62-1, BB headers, RARLYL8 Zork, additional 993 oil filter, plx/inyourface gage, RS style coilover, Fikse FM10-17 wheels, TIAL 46mm 1 bar. (where the heck did all my money go?)
Old 07-25-2009, 01:04 PM
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Doug Siegel
 
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Is there only one type of GT35R or are there different sizing options?

I was told that the turbo cooling requirements are different than stock. How so? What do I need to know?
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88' blk/blk 930: Haltech EFI, Twin Plug, Pauter Rods, Nascar Bearings, custom crank work, dowel pinned case, ported manifold and heads, Kokeln I/C, SC Cams, Turbonetics ball bearing 62-1, BB headers, RARLYL8 Zork, additional 993 oil filter, plx/inyourface gage, RS style coilover, Fikse FM10-17 wheels, TIAL 46mm 1 bar. (where the heck did all my money go?)
Old 07-25-2009, 01:08 PM
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Well, as far as the GT-35r... I think that there are two different types...and then there are different exhaust housings ( to get different A/R ratios)

If I am correct, the "r" in Gt-35r...stand for the ball bearing model. You can get a GT-35...without the "r" and it will be a regular style bearing...or bushing.

Then there are the two types of compressor housings... one with the "anti-surge" and one without.

As far as different types of construction.... I have found only 2. Tial makes a GT-35r model with a cast Stainless Steel housing, with V-band connections, instead of a t-3 or t-4 exhaust connection. It weighs like 33% less that a regular cast iron turbo. And then there are the cast iron (exhaust side) turbos that everyone else sells.

You can also get different ratios on the exhaust side ( .63 .86 and 1.06)

The GT-35r is made to be lubricated by oil....and also cooled by radiator coolant. BUT, I have seen these turbos run with only oil for lubricant and cooling...and they have done fine.
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Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-3584RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk
Old 07-25-2009, 01:19 PM
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Doug Siegel
 
Join Date: Oct 2007
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Thanks for the clarity Brad.

So, which GT35R do you guys have?

Can I use my .68 hot housing from my turbonetics on the gt35-r?
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88' blk/blk 930: Haltech EFI, Twin Plug, Pauter Rods, Nascar Bearings, custom crank work, dowel pinned case, ported manifold and heads, Kokeln I/C, SC Cams, Turbonetics ball bearing 62-1, BB headers, RARLYL8 Zork, additional 993 oil filter, plx/inyourface gage, RS style coilover, Fikse FM10-17 wheels, TIAL 46mm 1 bar. (where the heck did all my money go?)
Old 07-25-2009, 01:49 PM
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I have the Tial GT-35r with the cast SS exhaust housing. The exhaust is the .86 ratio..... The compressor housing is also the anti-surge housing. Here are a few pics....





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Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-3584RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk
Old 07-25-2009, 01:55 PM
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Doug Siegel
 
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Location: Bloomington, IN
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Brad,
Is anti surge a v band clamp to the j/pipe- or headers?

Any idea why the G35R boost comes on sooner than my Turbonetics 62-1 ball bearing 65mm, .68?

I don't want to change turbos to then find out that the fix was a matter of cam adjustment, timing, and fuel map...
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88' blk/blk 930: Haltech EFI, Twin Plug, Pauter Rods, Nascar Bearings, custom crank work, dowel pinned case, ported manifold and heads, Kokeln I/C, SC Cams, Turbonetics ball bearing 62-1, BB headers, RARLYL8 Zork, additional 993 oil filter, plx/inyourface gage, RS style coilover, Fikse FM10-17 wheels, TIAL 46mm 1 bar. (where the heck did all my money go?)
Old 07-25-2009, 02:55 PM
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Full spool is totally going to depend on how much power you are looking to make, and how much boost. There is always a trade off. Displacement, compression etc have a large impact as well. The new billet compressor wheel turbos from Precision Turbo are the cats meow. That is what I have. Nothing compares to them on the market.
Old 07-25-2009, 05:16 PM
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Quote:
Originally Posted by strokher racing View Post
Full spool is totally going to depend on how much power you are looking to make, and how much boost. There is always a trade off. Displacement, compression etc have a large impact as well. The new billet compressor wheel turbos from Precision Turbo are the cats meow. That is what I have. Nothing compares to them on the market.
Yes, Those turbos are also very nice!!!!
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Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-3584RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk
Old 07-25-2009, 06:19 PM
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My last turbo was one of their bad boys from a few years ago. This new one is supposed to be light years ahead of that one. Harry the owner of Precision personally specd this new billet unit out so I am hoping for the best
Old 07-25-2009, 06:21 PM
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Quote:
Originally Posted by dsiegel360 View Post
Brad,
Is anti surge a v band clamp to the j/pipe- or headers?
.
The anti surge portion of the compressor housing in on the air intake side of the housing... you can see it in the first picture. It is the machined groove that helps the turbo from comprssor stall/ surging issues. Th V-band stuff is one of the things that Tial does. We shall see how it flows ( Instead of the turbo having a more traditional t-3 or t-4 flange).
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Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-3584RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk
Old 07-25-2009, 06:23 PM
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Doug Siegel
 
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How much do them Precision Turbos setcha back?

Brad,
Since you are running a .86 exhaust side, will this produce later boost than what Don is suggesting of his GT35-R?
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88' blk/blk 930: Haltech EFI, Twin Plug, Pauter Rods, Nascar Bearings, custom crank work, dowel pinned case, ported manifold and heads, Kokeln I/C, SC Cams, Turbonetics ball bearing 62-1, BB headers, RARLYL8 Zork, additional 993 oil filter, plx/inyourface gage, RS style coilover, Fikse FM10-17 wheels, TIAL 46mm 1 bar. (where the heck did all my money go?)
Old 07-25-2009, 08:27 PM
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Doug, I think Don is running the same ratio hot side....
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Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-3584RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk
Old 07-25-2009, 08:36 PM
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Precision turbos are not that expensive. I laugh at how the Porsche shops charge so much for inferior turbos.
Old 07-25-2009, 09:27 PM
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sh#t the bed Brad, that's sweet, the standard castings of GTs are pretty ordinary I think, the TiAL housings takes care of that...
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Old 07-25-2009, 09:32 PM
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Doug Siegel
 
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Quote:
Originally Posted by strokher racing View Post
Precision turbos are not that expensive. I laugh at how the Porsche shops charge so much for inferior turbos.
Are the precision turbos designed to be cooled with oil? Does it need a heavy duty scavenge pump or will the stock 930 pump be ok?

Which turbo will do the trick for a 3.4, 500-550 hp?

In comparison with the same general spec Garrett and HFS, will the precision come in earlier, stronger, and push longer? ....making this turbo sounds like porn.
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88' blk/blk 930: Haltech EFI, Twin Plug, Pauter Rods, Nascar Bearings, custom crank work, dowel pinned case, ported manifold and heads, Kokeln I/C, SC Cams, Turbonetics ball bearing 62-1, BB headers, RARLYL8 Zork, additional 993 oil filter, plx/inyourface gage, RS style coilover, Fikse FM10-17 wheels, TIAL 46mm 1 bar. (where the heck did all my money go?)
Old 07-25-2009, 10:20 PM
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Best thing to do is call Precision. They will set you up. You cant compare their stuff to KKK turbos lol

Old 07-25-2009, 10:56 PM
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