SoFast

OK, but they also spoke about the K27HF-2? How is this different from the K27HF2 mentioned here? The dash between the numbers? Is this a new item, or an old item being re-hashed?

PorschePhD

No the HF2 and HF-2 are the same thing. The dash is nothing more than a way to not get the 2 lost.

Geoffrey

k27HF2 = k27HF-2 No difference. It is a new design in the HF series turbos from Kevin.

SoFast

So this is the same turbo from before? So it isnt new? Or is it? I am just trying to figure out the latest and greatest. Knowing which is which, and what does what helps. I am new to this, so I appologize. I just want too know what works for the application. I.E. - A stock 3.3l transformation to EFI? "S" or "2"? Which is more appropriate? What in addition is required? What size intercooler? What needs to be custom made for this application? Spring is here and the itch is as well.......

Geoffrey

The K27HF (or HF1 as it may be known) is the original High Flow turbo Kevin designed. It can support approximately 500hp without falling off the efficiency island. It is designed for the CIS injected engines, 3.3-3.6l

The K27HF 'S' is a slight modification of the original HF that has a slightly different compressor housing (NOT WHEEL) that allows for more airflow and slightly different A/R.

The K27HF2 is an entirely new turbo. It has a larger compressor wheel than the HF1 and can support 600ish HP. It is designed for engines with EFI, in both 3.3l and 3.6l. It should be very similar to the TSO4-66 Garrett turbo (which I run), but has the bearing system designed to work in the oil cooled environment.

SGOGT4

Are there markings on the turbo housings that would allow one to identify which is in their car? And are these visable once the turbo is installed?

Kevin

930LDR, On the ID tag you would be able to read HF2. You could read the tag once on the car.

rs911t

These threads are great! All this talk of various turbos is confusing for noobs like myself. The race car I bought last year has a K27 that is at least 5 years old, but is missing the ID tag. Is there anyway to identify it beyond K27?

Kevin

If you took a picture of the compressor wheel and turbine wheel I would be able to help you. Really the 2 choices 5 years ago will be a K27-7006 and K27-7200

BrianKeithSmith

question: I always thought/heard that once you got up into the 600ish HP range that you should consider changing from the 930 rods to some better rods??? (from the looks of my 930 rods, I can't imagine other rods being any stronger).

What's the concensus here on that. Obviously you'd want better Rod Bolts (ARP, or Raceware) but would you change your rods as well to use other, non-930, rods???

Brian

Sameer

Rods as in Conrods, I'd go Pauter or Carillo. However Ruf does sell titanium conrods and puts a 100,000 km warranty on it.

Head studs and conrod bolts would be a good upgrade even if you were in the 400bhp range when doing a rebuilt. Most would stick with ARP or Raceware.

SoFast

OK, so I understand the Turbo differences. Thanks for the info. Now, all I can say this turbo isnt that new. It has been in other threads that I have read about. The k27HF-2......What price point for resale are we talking about? As well, if you have an oil cooler on your car, what is most important? I have read about engine and Turbo oil coolers as seperates or in a single unit? Could someone help me on this topic?

Kevin

SoFast, what are you engine specs. Are you running EFI now?

SoFast

Kevin, I have a 3.3l that is pretty much stock with 35,000 original miles. I want to do a full make over, and have been reading and looking up information on the transformation. Yes, I want to switch over to EFI using the blocks, as I am not interested in doing a full makeover on the engine yet. I want a reliable car that is fun. As well, since we are on the subject, I also want to replace the clutch and flywheel. So many differing opnions...What is your best suggestion?

Kevin

Doing the EFI conversion is a good start. You really need to set a budget and get the hardware to fit your goals. In the end, one usually alway spends more.