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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.
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Old 01-10-2007, 09:13 PM
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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.
Old 01-10-2007, 09:45 PM
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K27-7200? Should be full in by 3000rpm for most applications.
What cams?
Intercooler?
Headers?
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Old 01-11-2007, 03:48 AM
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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.
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Old 01-11-2007, 07:30 AM
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Sounds like you might have an exhaust leak before the turbo charger.
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Old 01-11-2007, 01:47 PM
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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?
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Old 01-11-2007, 02:37 PM
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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.
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Old 01-11-2007, 04:57 PM
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Could I butt in and ask where, and how much are these ??
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Old 01-11-2007, 05:15 PM
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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.
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Old 01-11-2007, 05:49 PM
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Could be your wastegate?
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Old 01-11-2007, 05:56 PM
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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
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Old 01-11-2007, 08:09 PM
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Here is an excellent source for Garrett GT series: ATP Turbo

Precision Turbo also has just about anything Garrett based.
Old 01-11-2007, 10:47 PM
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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.
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Old 01-11-2007, 11:03 PM
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thanks
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Old 01-12-2007, 04:15 PM
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Give us the stamped info listed on the blue/silver tag as seen on this picture, note this is a stock 3LDZ turbo.

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Old 01-12-2007, 05:26 PM
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It's a 99% chance that your turbine has FOD.
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Old 01-15-2007, 05:42 PM
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Yeah, you either have a leak or your turbine/compressor is FOD:ed/worn down.

You should get full boost at <3500 RPM...
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Old 01-16-2007, 07:25 AM
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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.
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Old 01-16-2007, 05:34 PM
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k27 turbo is outdated buy presision turbo lets say a 60 to a 72mm gts no lag and go fast
Old 01-20-2007, 08:49 PM
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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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Old 01-21-2007, 02:02 AM
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