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Join Date: Oct 2006
Location: LA
Posts: 223
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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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86 930 |
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01-10-2007, 09:13 PM
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Location: Austin, TX
Posts: 149
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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.
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01-10-2007, 09:45 PM
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Crotchety Old Bastard
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K27-7200? Should be full in by 3000rpm for most applications.
What cams? Intercooler? Headers?
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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01-11-2007, 03:48 AM
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Forced Induction Junkie
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Re: Need helps on turbo!! K27 is lagging
Quote:
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Dave '85 930 Factory Special Wishes Flachbau Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P |
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01-11-2007, 07:30 AM
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A fellow Pelacanite
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Sounds like you might have an exhaust leak before the turbo charger.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG. Fitting - New service kit. Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head. 1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods. Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit. http://www.danasoft.com/sig/Iamnotanumber.jpg |
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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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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition 
Last edited by WydRyd; 01-11-2007 at 02:39 PM.. |
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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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86 930 |
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01-11-2007, 04:57 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,079
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Could I butt in and ask where, and how much are these ??
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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01-11-2007, 05:15 PM
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Crotchety Old Bastard
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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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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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01-11-2007, 05:49 PM
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Could be your wastegate?
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
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01-11-2007, 05:56 PM
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Location: Columbus, OH
Posts: 650
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Quote:
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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Maxx 86 Ruf'd and rebuilt (sold) |
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01-11-2007, 08:09 PM
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Registered
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Location: Austin, TX
Posts: 149
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Here is an excellent source for Garrett GT series: ATP Turbo
Precision Turbo also has just about anything Garrett based. |
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01-11-2007, 10:47 PM
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Quote:
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86 930 |
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01-11-2007, 11:03 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,079
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thanks
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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01-12-2007, 04:15 PM
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+ lurking - contributing
Join Date: Dec 2005
Location: Atlanta, Georgia
Posts: 626
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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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87 930 96 BMW M3 Coupe 89 951 08 Astra H Peugeot moped |
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01-12-2007, 05:26 PM
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It's a 99% chance that your turbine has FOD.
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- Colin GTC Motorsports, PCA Club Racing National Scrutineer '92 Euro Cup #96ZNS498058 (PCA GTC1 #19) Past '91 C2 Turbo (PCA D Class #38), '04 Cayenne S, '74 914-6 3.2 (236rwhp), '02 986S M030, '71 914-4 2.1, '76 914-4 2.0 |
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01-15-2007, 05:42 PM
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Location: Sweden
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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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Thank you for your time, |
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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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01-16-2007, 05:34 PM
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Location: st louis mo
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k27 turbo is outdated buy presision turbo lets say a 60 to a 72mm gts no lag and go fast
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01-20-2007, 08:49 PM
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Location: Sweden
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Quote:
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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Thank you for your time, |
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01-21-2007, 02:02 AM
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78 Porsche 911SC 3.0L, 3.3Turbo soon. 
1985 Porsche 930 Fac. Slantnose 3.3l
