K27hf ? - Page 2

YermanCars · 03-23-2005, 05:50 AM

I just got this from percision gt37/40

briankeithsmith · 03-23-2005, 08:52 AM

Try the new K27HF2.
It is suppose to support up to 640RWHP.

My K27HF comes on around 26-2700, and is still pulling strong all the way to redline.

Brian

hobieboy · 03-23-2005, 12:18 PM

Brian,

Comes on around 26-2700... is that full boost or start of noticeable boost as in ~.5 bar?

thanks...

350HP930 · 03-23-2005, 02:44 PM

I realize that a big turbo won't spool up fast enough which is another reason why I am keeping my power limit low. I rather have a turbo that is strapped to make max boost at red line instead of one that leaves half of the RPM range virtually unusable.

Thats the reason why I was interested in the modified K27, but due to the cost and availability I am leaning beeps way of looking for the best turbo I can buy that has the right specs. The only downside will be having to modify the exhaust flange.

I spent some time today measuring all of my K27 dimensions so I can see what turbo best matches the K27 hot side since the HF shows thats its a big enough turbine. If it also has an efficient compressor that can move between 550 and 600 HP worth of air I will have found the turbo I am looking for.

350HP930 · 03-23-2005, 05:20 PM

Hmm, the cheap favorite of the supra guys, the T4 60-1, looks to be a rather well matched turbo to boot.

Decisions, decisions . . .

juan ruiz · juan ruiz's Garage

60-1 HI FI I been tell everyone for ever but of course, what do I know.

350HP930 · 03-23-2005, 05:41 PM

Is that what you are running Juan? Your input would be greatly appreciated.

juan ruiz · juan ruiz's Garage

Not anymore that was 7 Turbos ago, but even today I feel that was the best turbo I have run, she produced 545rwhp on it but that was it, after 150mph or so she will die.

Turbos are like shoes, everyone can study, read the maps etc but theres only one test, to fit it and test it with your specific application, out of 11 turbos that I have run NOT one has supported or performed like the maps had suggested and thats why it took 11 turbos to get to this level.

KKK may be good but in my eyes is old technology unless they have a new series I am not aware of.

It seems that Everyones "Lag" concerns are border line anal, is the entire combination that will give you all the juice, install the wrong headers and that can be the difference between having or losing 100hp.

What ever you do My best wishes to you and the rest of the gang in the quest for more power

350HP930 · 03-23-2005, 07:50 PM

Thank you for the input Juan. Since I am a cheap bastard it looks like 60-1 is in the lead as far as selections go.

350HP930 · 03-24-2005, 04:30 PM

Hey Juan, with the 60-1 do you remember at what RPMs it started to build boost?

Have you, or anyone else here, tried the GT35R?

YermanCars · 03-24-2005, 05:52 PM

350hp930

Gt35r wont be a good choice, like I said 37/40 w/ special trim is what I got and should be the bomb but as
juan says we wont really know until shes on the car, so we will wait and see

There is a big difference in price between the 60-1 and gt series turbos

So thats one thing you have to chose

TurboKraft · 03-28-2005, 11:20 AM

Quote:

Originally posted by 350HP930
Is anyone here using the GT-35? I am curious as to where one will start generating boost on a 3.3.

The last thing I want is a motor that doesn't start making boost till 4K RPM.

==========================================

We are using GT35R ball bearing turbos on 3.3L 930s and the response time is great. As responsive to throttle inputs as a tiny K27-7200? No, but you can't expect any significantly larger turbo to be that snappy. It does outperform every variant of the K27 hybrid I've tried, though: K27HF, K27/29, K27/60-1... The last car we installed one onto (C2T with EFI) had 1.0bar boost <3,000rpm, and that engine had stock cams and a stock rear muffler (http://turbokraft.com/gallery/Bruce). That turbo is sized to deliver up to 620hp of airflow.

There is no reliability issue running the GT turbos "dry," without coolant through the side passages of the CHRA.

The *GT35R* does have a different exhaust flange and oil drain flange, so you have to change those on the exhaust kit you have. We can supply it with a bolt-in compressor cover.

Contact me for more information on using Garrett GT turbochargers on your Porsche 911 Turbo -