speed force racing GT35

[jbrown]

I had the K27HF on my car and wanted to see how the speedforce racing direct bolt on GT35 would work. I think for my application the K27HF is better so after using the GT35 for 150 miles I am going to take it off and put the K series back on.
I would like to recoup some of my money so I am going to put the GT35 up for sale.
I also made custom brackets to mount the turbo and I will give it all with it. Direct bolt on with all brackets.
I paid $1800 for it . I will take $1300. Here is a pic. It is 1 week old and still has its 1 yr warrant and I have the receipt.
Anyone interested PM me.
Thanks John

[Tippy]

If I may ask, what made you want to switch back?

[jbrown]

Originally Posted by Tippy

If I may ask, what made you want to switch back?

I think the K27 spools up quicker on my car. I don't see any major improvement up top. I run 15-16lbs of boost with CIS and meth injection and thought the Garret would spool quicker and it really doesn't. I think it would work better on EFI motor

[Tippy]

Hmm. Is the Garrett divided?

[JFairman]

I have a very low mileage K27HFS that I had rebuilt by Durabilt turbo that has had very little use since I installed it. It works real good and doesn't smoke or do anything wrong.
Durabilt-Turbo.com - www.durabilt-turbo.com

I have the reciept from Durabilt from when they rebuilt it. I also have a K27 7006 and plan on installing it after I get my motor put back together.
If you would like a good working low mileage spare K27 HFS I'll trade you mine for your GT35R.

Let me know...

thanks,
Jim

[Ronnie's.930]

Threadjack, but Jim, I'm curious about your decision to go back to the 7006?

[JFairman]

Originally Posted by Ronnie's.930

Threadjack, but Jim, I'm curious about your decision to go back to the 7006?

The HFS has less turbo lag than the 7006 below 3000 rpm because of it's smaller K27 7200 hot side but the 7006 makes more top end power because it has a bigger hot side housing and bigger diameter turbine wheel than the K27 HFS.

I really like the top end power rush of the 7006 and with the top end rebuild I'm doing on my motor with larger 40mm intake ports etc I think it will work very nice.
I also like the turbo whistle sound that comes out the left side exhaust on my car with the 7006 as it bounces off houses and bushes to the left of me while I drive.
The HFS has very little turbo whistle from the exhaust.

That's the reason.

[Ronnie's.930]

Thanks . . . you probably remember that I also have a HF - bought around the same time as yours and also had the same, initial problems with it - it's been problem free for a while, but in the back of my mind, I'm always thinking it will be short lived. I bet I would like the boost characteristics of the 7006, too . . . never driven a 930 with one of those in it, but raced a Ducati 748R for years - it made all of its power at the top of the RPM range, and the feeling of that really is something!

[JFairman]

Yeah you probably would like the 7006 out on Texas country roads and highways. The HFS is a good all around turbo for street use that bolts on with few modifications and it has much more top end power than a standard K27 7200 because it has the bigger cold side Holset compressor wheel and bigger housing to fit over it.

The K27 7006 has more midrange turbo lag than the 7200 or HFS and comes on boost around 300 - 400 rpm higher than the HFS but it makes more top end horsepower than the HFS because of the bigger hot side housing and exhaust turbine wheel that reduces exhaust backpressure in the headers before the turbo letting the engine breathe or pump out exhaust gasses easier and better.

Some people would like the 7200 more for all around street use and others might like the 7006 more for highway, open country roads, or track use.
I'd like to try a Garrett GT35R and see how I like it.

[jbrown]

Originally Posted by Tippy

Hmm. Is the Garrett divided?

I dont know what you mean by divided...


Jim , I have a K27HF already and It was rebuild less than 10,000 miles ago and is in great shape.. Thanks though

[xbmwguy]

is a gt 35 a good option for a cis car? even with all the cis fueling toys? also is that a journal or bb turbo?

[Tippy]

JB, divided means divided scroll. The 2 banks of the engine are separated all the way until the exhaust hits the turbine wheel.

By reading that website, it seems it's an "open" housing; meaning exhaust "collision" occurs reducing potential exhaust energy slowing boost onset.

With that said, a friends 965 using a GT35R with a divided 1.06AR T4 (huge!) housing with a NON-divided header spooled unbelievably quick.

I suspect your K27 has very tiny AR turbine housing since GT35R's are really untouchable in boost onset.

[TurboKraft]

That's ball bearing turbocharger. In our experience, it's an excellent choice even for 3.3L CIS injected engines, and we've never had one not spool up faster than a K27 or K27 hybrid.
I wonder what A/R turbine housing you were sent?

If someone's in the market for a GT35R, that's an excellent price!

[Nuen Werke]

I don't know you Chris but I know you have an excellent reputation and knowledge base on these things and I am glad you chimed in here as I was tempted to but held back. It is the craziest thing to say that the gt35r is coming off and any 3K going back in it's place after the person has tried it out. I'm stunned

[jbrown]

Just talked to Tim at speed force racing and he said that the GT35 has a 1.06 AR and for my application I would be better with a .82AR . That should do the trick. So I might send it back to have the smaller .82AR put in....

[TurboKraft]

Yeah, that'll do it... This isn't some 4V high rev engine with 9:1 compression.

Have him send the smaller A/R housing to you, no need to send in the turbo and have more down time for something you can swap out with basic hand tools. Just remove the 6 bolts that hold on the turbine housing, change out the housings, install bolts and torque to 17ft.lb.

Post your new driving impressions afterward.

[jbrown]

Thanks Chris.. .82 AR on the way should see it Weds. Let you guys know how it works out...

[VonHanstein]

Hi JB.

Could you post a few clear photos of your K27HF?
The turbo on my car was sold to me as a HF but I've never been totally convinced it is a HF.
It was a low mileage used item bought from a reputable owner but it came via the workshop doing the work on his car and may have been switched before I got it.

It would be much appreciated.

Thank you.

Robert

[jbrown]

Originally Posted by VonHanstein

Hi JB.

Could you post a few clear photos of your K27HF?
The turbo on my car was sold to me as a HF but I've never been totally convinced it is a HF.
It was a low mileage used item bought from a reputable owner but it came via the workshop doing the work on his car and may have been switched before I got it.

It would be much appreciated.

Thank you.

Robert

Sure ... I have it at work. I will take some pics tomorrow and post them.

[RarlyL8]

Maybe I can save you some effort.
The UMW K27HF will have a lage blue and silver tag telling you what it is.