|
|
|
|
| Author |
|
|
vwaudibmw
|
1987 930 Turbo sputter on acceleration below 4000 rpms..HELP
My 1987 911 Turbo has a K-27 turbo, Billy Boat exhaust and Andial fuel enrichment system. When I accelerate in 3rd or 4th gear below 4000 rpms AND with .5 bar boost or greater the engine "sputters" and does not accelerate hard or smooth. When the boost is below .5 bar upto 4000 rpms or when the rpms are above 4000 and full boost (1 bar) it is smooth and accelerates appropriately. ANY IDEAS?? I have disconnected the Andial and it acts the same. I am not sure it is related to the colder weather as I am in CT. Any help would be appreciated. Thanks....
|
||
12-04-2010, 05:13 PM
|
|
|
Registered
Join Date: Jul 2008
Location: Central Washington State
Posts: 4,396
|
Hmmm...weird. My first inclination would be to look for a bad IC O'ring. Under boost it may be deforming enough to leak the boost pressure out, causing an overly rich condition. But it's strange that all seems find at full boost over 4000 rpms.
__________________
Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ. |
||
|
12-04-2010, 05:58 PM
|
|
|
vwaudibmw
|
Thanks Mark. As a matter of fact I just had the Inter Cooler off tonite and found a 1" piece cut out of one Oring. Haven't run the car yet....maybe tomorrow. I was looking at the distributor.....the vacuum pot and it's mechanism was a bit sticky.....hopefully that will help too. Will post results if they are better. Thanks
|
||
|
12-04-2010, 06:37 PM
|
|
|
Registered
|
Gorgeous car...maybe just my personal preference, but I believe the best looking 911's are white/GP White with black trim...
Sorry I can't help with the tech problem...maybe someone else already solved it here.
__________________
1983 911 3.3L Turbo(YES, I know the turbo badge is on the right...had to be different!) 1996 Toyota Corolla(der 'clapper') |
||
|
12-04-2010, 07:27 PM
|
|
|
surfpangea
|
Nice cars!
__________________
MB CL 600 6liter V12 daily driver 86 Corvette Stage 1 Nos (sold) 78 911sc Targa (sold) 77 930 stock 3.0 gsf header ,borla exhaust,gt30 BB turbo, V-band, full bay IC,WMI, 46 mm Adjustable waste-gate,Zeitronix wideband, Intergrated Car pc, Winlog interface Beta |
||
|
12-05-2010, 02:11 AM
|
|
|
Crotchety Old Bastard
|
Nice looking slant.
What RPM does your engine reach full boost in 3rd and 4th gear? I suspect a new O-ring will fix the problem.
__________________
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 |
||
|
12-05-2010, 06:46 AM
|
|
|
|
Registered User
|
at what RPM should the boost come alive? and at what RPM should the boost be pegged?
__________________
84 930 Slant 15 Sonata 2.0T 08 Ram 1500 15 Ram Eco Diesel |
||
|
12-05-2010, 07:07 AM
|
|
|
Crotchety Old Bastard
|
Depends on which K27 is installed.
__________________
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 |
||
|
12-05-2010, 09:16 AM
|
|
|
vwaudibmw
|
Took her out for a ride after replacing the IC Oring and had to adjust the CIS unit to make it leaner to run correct. The sputter is still there and feels like a bit less power before the boost starts....I think I need to set the ignition timing. Any tips on how and what the specs are?? I assume a timing light ....a "Z1" on the pulley is TDC but is there a mark for the set point.....it's a stock pulley. Thanks....the work continues...
|
||
|
12-05-2010, 05:29 PM
|
|
|
Registered
|
Quote:
__________________
1975 914, 1988 944 turbo S sold. 1986 944 turbo resleeve 2.7, DTA S-60 PRO. 1986 911 Carrera with 965 turbo motor, DTA S-80 PRO. 1989 930 EFI, DTA, Carrera intake, twinturbo,2x GT-35R. 1991 964 convertible, wide body conversion. |
||
|
12-06-2010, 05:16 AM
|
|
|
Registered
|
Any results?
__________________
2000 Boxster S 2004 330ci convertible 1978 450 SLC 1924 Model T Ford touring Fleet of Ford Buses, Sedans, SUVs and Limos |
||
|
01-22-2011, 01:23 PM
|
|
|
Registered
Join Date: May 2008
Posts: 1,144
|
Quote:
__________________
'87, Modified WUR, Billet valve, 965 downpipe, Kokeln intercooler, GHL headers, Garrett T04B K27 hybrid, Tial w/.8 bar, WEGO IV, RarlyL8 dual out, LSD |
||
|
01-23-2011, 05:49 AM
|
|
|
|
Registered
Join Date: Mar 2004
Posts: 342
|
Check your timing, advance etc. Also check your warm up regulator and the mixture. And one thing I rememebr, if you are running the stock intake assembly with the OEM bypass valve assembly, it that the bypass piston (Which connects the intake and pressure side of the turbo and manifold under the intercooler, the cushioning gaskets inside the bypass bore fail, they crumble and vanish, thats not so much the problem, what happens is the picton now slams against the cap plate on both ends of the bore and eventually can crack it and you can have a vacuum leak. Its rare , but I had a couple back in the day that I had traced to a fracutred end cap on that assembly. you know those gaskets are gone when you tap the throttle and hear a click noise from the bypass. just check it
|
||
|
01-23-2011, 06:48 PM
|
|
|
Registered User
|
I am replacing some seals as well. I did a search on pelican and it seems that this part 999 701 469 40(o ring) goes on the throttle body side of the intercooler and that you also put one up against the throttle body housing to act as a cushion when the intercooler slides over it? can anyone verify that
__________________
84 930 Slant 15 Sonata 2.0T 08 Ram 1500 15 Ram Eco Diesel |
||
|
01-24-2011, 02:25 PM
|
|
930
Porsche 930 3.0
BENZO
Bike
1966 BMW R60_2
0 HD 1955 and 1969 tele glide and allegero
78 Porsche 911SC 3.0L, 3.3Turbo soon. 
930S
Porsche 964 wide body, turbo kit conversion
Porsche 930 turbo with twin GT 35 R turbos.
Porsche 911 Carrera
Porsche 944 turbo sold
Porsche 944 turbo
Old Yeller
Boxster
