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-   -   Need helps on turbo!! K27 is lagging (http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/324242-need-helps-turbo-k27-lagging.html)

RennSport930 01-10-2007 09:13 PM

Need helps on turbo!! K27 is lagging
 
For those 930 experts, I need helps on choosing a prober turbo for my 86 930. I felt my K27 lags alot. it spools around 4000rpm, full boost at 4900 - 5000 rpm. I'm thinking of getting a Garrett GT BB. Any expert advise will much appreciated from a 930 newbie.

Porschefile 01-10-2007 09:45 PM

It sounds like there is something up with your car. I'd check for any kind of boost leaks and to make sure your wastegate is hooked up and functioning properly. From what I've seen, you should be getting full boost well before 4000rpm. I've seen guys with K27 HF's and other modded K27's making full boost somewhere around the ~3k rpm range so you don't necessarily have to convert to a GT series if you're just looking for better response. If you could give us a bit more info on your setup (all stock, mods, etc?) we might be able to help out a bit more.

RarlyL8 01-11-2007 03:48 AM

K27-7200? Should be full in by 3000rpm for most applications.
What cams?
Intercooler?
Headers?

WERK I 01-11-2007 07:30 AM

Re: Need helps on turbo!! K27 is lagging
 
Quote:

Originally posted by RennSport930
For those 930 experts, I need helps on choosing a prober turbo for my 86 930. I felt my K27 lags alot. it spools around 4000rpm, full boost at 4900 - 5000 rpm. I'm thinking of getting a Garrett GT BB. Any expert advise will much appreciated from a 930 newbie.
Have you verified that you have a K27 mounted on your engine? That engine came stock with a 3LDZ turbocharger. The type of turbo can be determined on the blue/silver data plate mounted on the turbocharger.

NathanUK 01-11-2007 01:47 PM

Sounds like you might have an exhaust leak before the turbo charger.

WydRyd 01-11-2007 02:37 PM

For a true bolt-on upgrade, you can't go passed the ImagineAuto K27-7200/K72-HFS turbos.

However, if you are after a ball-bearing solution, I'd recommend a GT30R for up to 500HP, or a GT35R for ~600HP. Amazing spool-up ;) Of course, these are not 100% bolt on, and you'd need to modify your muffler flange to mate to the turbo and use a smaller oil feed line and modify the flange on your oil drink tank to mate with the GT turbo.

Are you running aftermarket headers, or still the heat exchanger setup?

RennSport930 01-11-2007 04:57 PM

Thanks guys!!

I'm running andial IC, stock exhaust, stock internal, 1 bar spring. fuel enrichment kit. however my boost gauge is showing 0.9. It's a andial mechanical type gauge. not sure why. I was assuming the gauge is not 100% accurate. could this be a leak? in regards of the K27, i'm not sure whether it's a K27HF or not. All I know is a euro spec K27 from previous owner.

afterburn 549 01-11-2007 05:15 PM

Could I butt in and ask where, and how much are these ??

RarlyL8 01-11-2007 05:49 PM

Something is wrong. If your gauge is correct you have a leak. Even with a stock exhaust you should see full boost by ~3000RPM. Post the numbers on the turbo and someone will identify it.

WydRyd 01-11-2007 05:56 PM

Could be your wastegate?

im4duke 01-11-2007 08:09 PM

Quote:

Originally posted by afterburn 549
Could I butt in and ask where, and how much are these ??
Are you asking about the HF-series turbos? Get them from Imagine Auto or from ultimate Motorwerks. Prices online.

If you're saking about the GT-series turbos, there are many more suppliers. An internet search or pelican search on garrett or GT35r will lead you in the right direction.

Cheers,
Maxx

Porschefile 01-11-2007 10:47 PM

Here is an excellent source for Garrett GT series: ATP Turbo

Precision Turbo also has just about anything Garrett based.

RennSport930 01-11-2007 11:03 PM

Quote:

Originally posted by RarlyL8
Something is wrong. If your gauge is correct you have a leak. Even with a stock exhaust you should see full boost by ~3000RPM. Post the numbers on the turbo and someone will identify it.
full boost at 3000?? that never happen. where do I get that numbers? from turbo? please advise thanks alot.

afterburn 549 01-12-2007 04:15 PM

thanks

William930t 01-12-2007 05:26 PM

Give us the stamped info listed on the blue/silver tag as seen on this picture, note this is a stock 3LDZ turbo.

http://forums.pelicanparts.com/uploa...1168655082.jpg

38D 01-15-2007 05:42 PM

It's a 99% chance that your turbine has FOD.

beepbeep 01-16-2007 07:25 AM

Yeah, you either have a leak or your turbine/compressor is FOD:ed/worn down.

You should get full boost at <3500 RPM...

gtu935 01-16-2007 05:34 PM

Before you get too crazy look at the hot housing. There is a cast number on the housing. The stock"street" size would be an 11 hot size. I'v seen them come with hot housings as big as 18. That would cause a very late spool up. The normal hot size for a track/street car would be a 13. Let me know what you find.

anthony 911 01-20-2007 08:49 PM

k27 turbo is outdated buy presision turbo lets say a 60 to a 72mm gts no lag and go fast

beepbeep 01-21-2007 02:02 AM

Quote:

Originally posted by anthony 911
k27 turbo is outdated buy presision turbo lets say a 60 to a 72mm gts no lag and go fast
What a blanket-statement!

Outdated or not, he should have full boost at 3300 RPM, even with old 3DLZ. Something is wrong with his car.


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