Car wont go past 4k rpm

metalfloyd123 · 03-14-2011, 12:26 PM

I have swapped a B230ft engine out of a 760 turbo wagon. Saturday I went out to drive and up the boost a little. The car was hitting 11psi and running great. When I started heading back to the house the car started bucking and stuttering once I hit around 5100rpm in 2nd and 4000rpm in 3rd and 4th.

I have new plugs in I checked them and they look fine. I don't see any vacuum leaks or any leaks in any hoses. The car runs fine up to those rpm and it’s only hitting about 5psi. Could this be a timing issue?

vivalavolvo · 03-14-2011, 01:48 PM

AMM become disconnected? Maybe an air or vacuum leak?

BrianB · 03-14-2011, 02:27 PM

Overboost switch kicking in? Maybe the AMM to turbo hose is collapsing under extreme vacuum.

Try driving granny-like and building the boost slowly. If the car suddenly resolves itself, probably your AMM-turbo hose is collapsing (especially if you can squeeze it with your fingers with the engine off and cold).

Also, your cbv might be malfunctioning, though if that's the case you'll probably need to jury-rig the Audi/Bosch CBV as the pierburg "golden pipe" (it cost like 500 bucks when it was available) is no longer available from Volvo. A thread about this:
http://forums.turbobricks.com/showthread.php?t=137666

Alternatively is the Forge CBV

http://www.forgemotorsport.com/conte...oduct=FMCL007P

metalfloyd123 · 03-14-2011, 02:40 PM

I have removed the CBV for a BOV. The intake pipe is steel pipe. Ill check the amm connection after work. I have hit fuel cut before and this feeling is different. Where the fuel cut it more abrupt this is more of a shuttering.

I had been driving for several miles hard before this started and during that time everything was fine. I checked the volt meter and the alternator seems to be working fine as well.

doucheNozzle · 03-14-2011, 04:28 PM

Check your IC hoses.

varg · 03-14-2011, 04:54 PM

Check your plugs, wires, cap and rotor. Could be spark blowout from worn out parts that just now gave up the ghost.

metalfloyd123 · 03-14-2011, 09:05 PM

Quote:

Originally Posted by scottyd

Check your IC hoses.

Yep that was the problem don't know how I missed it the first time I looked things over.

Thanks for the help guys!!!

03-14-2011, 12:26 PM	#1
metalfloyd123 Board Member Join Date: Apr 2005 Location: Winston Salem, NC	Car wont go past 4k rpm I have swapped a B230ft engine out of a 760 turbo wagon. Saturday I went out to drive and up the boost a little. The car was hitting 11psi and running great. When I started heading back to the house the car started bucking and stuttering once I hit around 5100rpm in 2nd and 4000rpm in 3rd and 4th. I have new plugs in I checked them and they look fine. I don't see any vacuum leaks or any leaks in any hoses. The car runs fine up to those rpm and it’s only hitting about 5psi. Could this be a timing issue? __________________ -'83 242 Flathood Project Thread. Thanks to Accu-Wrench for their work. -'02 Subaru WRX -Daily Driver, Stage 2

03-14-2011, 01:48 PM	#2
vivalavolvo Board Member Join Date: Jan 2008 Location: Philadelphia	AMM become disconnected? Maybe an air or vacuum leak? __________________ 1978 242DL - 1995 855 T5 ARD Green - 1992 Volvo 745

03-14-2011, 02:27 PM	#3
BrianB Board Member Join Date: Jul 2007 Location: Hawks Prairie, WA	Overboost switch kicking in? Maybe the AMM to turbo hose is collapsing under extreme vacuum. Try driving granny-like and building the boost slowly. If the car suddenly resolves itself, probably your AMM-turbo hose is collapsing (especially if you can squeeze it with your fingers with the engine off and cold). Also, your cbv might be malfunctioning, though if that's the case you'll probably need to jury-rig the Audi/Bosch CBV as the pierburg "golden pipe" (it cost like 500 bucks when it was available) is no longer available from Volvo. A thread about this: http://forums.turbobricks.com/showthread.php?t=137666 Alternatively is the Forge CBV http://www.forgemotorsport.com/conte...oduct=FMCL007P __________________ Brian Bradford Tri-Cities, WA Present Cars: A 1997 Volvo 965 "Dan'l Webster"

03-14-2011, 04:28 PM	#5
doucheNozzle Newbie Join Date: Feb 2009 Location: The Pitt, 15147	Check your IC hoses. __________________ '93 944 T - #TrophyVo '00 XC70 SE - Slow '04 V70 T5A - Feels Fast

03-14-2011, 04:54 PM	#6
varg kludgemeister Join Date: Jul 2009 Location: ןɟ 'ʎʇunoɔ ɥɔɐǝq ɯןɐd	Check your plugs, wires, cap and rotor. Could be spark blowout from worn out parts that just now gave up the ghost. __________________ '85 244DL B21FT swap (gone ), ->Project thread '91 E30 318is, M20 swapped, turbocharged. project in progress. Kawasaki ZRX1200R

03-14-2011, 02:40 PM	#4
metalfloyd123 Board Member Join Date: Apr 2005 Location: Winston Salem, NC	I have removed the CBV for a BOV. The intake pipe is steel pipe. Ill check the amm connection after work. I have hit fuel cut before and this feeling is different. Where the fuel cut it more abrupt this is more of a shuttering. I had been driving for several miles hard before this started and during that time everything was fine. I checked the volt meter and the alternator seems to be working fine as well.

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