Misfire advice BT with cams

TTransport · 08-26-2008, 10:49 PM

I'm running the GIAC BT tune with 93 octane, at idle (1000Rpms) I have random misfires cylinder four / two are the worst 25~50 misfires, cylinder one and three around 4~10. Once I break 1750 rpms no more misfires. I've tried: plugs (factory,IK22,IK24), gaps(.26,.27,.28,.30), injectors(Siemens 3172 55lb 575CC), coil packs, different speed sensors, etc and have yet to come up with any combination that takes care of it. I had the same symptoms with the old factory software and my old eurospec head.

Could it be the cam position sensor? Commonly called the HAL?

Could it be the schrick cams intake 252 exhaust 260?

Could it be the weight of my harmonic balancer it is 3.4lbs, Eurospec used a 2.2lbs?

Could it be that I need to get variable gears on the end of my cams to try to adjust the amount of intake or exhaust separately?

Perhaps I need to tune in more timing at idle?

A400 · 08-27-2008, 05:38 AM

I run a mmuch larger set of cams w/no prob. Adj. gears are useful to move power band, not cure prob. you are referencing. If you used anything from EUROSPEC, TO ME THAT WOULD BE SUSPECT AT LEAST GIVEN THE 2 ENGINES i HAVE SEEN THEM SELL TO THE UNSUSPECTING. It may be that you need more coil, it may be the tune, was it done for the combination you are using? Need more info on your setup. Have you logged the problem w/a VAG tool? that is where you should start. Take it back to the tuner if nothing else shows up. Very few do a good job on large turbos IMO, check into Dahlback

TTransport · 08-27-2008, 02:51 PM

Working with my tuner (remotely), and using vag com / scangauge. No the tune wasn't specifically written for this config, it's being adapted. thanks

A400 · 09-27-2008, 06:51 AM

TTransport · 10-03-2008, 10:29 AM

I know 014/015/016, for misfires, but what do you log for the cam / hall sensor?

08-27-2008, 05:38 AM	#2
A400 AudiWorld Super User Garage is empty, add now Join Date: Sep 2003 Posts: 3,931	Turbo size w/determine spark gap -higher flow = closer gap. Cams arent prob. if installed correctly I run a mmuch larger set of cams w/no prob. Adj. gears are useful to move power band, not cure prob. you are referencing. If you used anything from EUROSPEC, TO ME THAT WOULD BE SUSPECT AT LEAST GIVEN THE 2 ENGINES i HAVE SEEN THEM SELL TO THE UNSUSPECTING. It may be that you need more coil, it may be the tune, was it done for the combination you are using? Need more info on your setup. Have you logged the problem w/a VAG tool? that is where you should start. Take it back to the tuner if nothing else shows up. Very few do a good job on large turbos IMO, check into Dahlback __________________ Whole lotta car

08-27-2008, 02:51 PM	#3
TTransport AudiWorld Senior Member Garage is empty, add now Join Date: Sep 2004 Location: Round Rock TX Posts: 1,614	Yep EuroSpec Run as far from their items as possible Working with my tuner (remotely), and using vag com / scangauge. No the tune wasn't specifically written for this config, it's being adapted. thanks __________________ MyFotki: Lots of Pics <u>2001 Audi TTQRoadster RavenBlack 2.2L->BT: </u> Motor: 2.2 forged Crank/Rods/Pistons, Girdle & deck cooling, Custom QEDpower Head with Schrick cams and Cat springs Forced Induction: GT3071R-WG-86AR-90TrimTurbine, DelRio Race Intercooler, DelRio BT Piping, Evo VFlo+ B5 S4 MAF, APR Bigport Intake ceramic coated, R32ThrottleBody, CoolingMist WaterMeth, larger injectors, fuelpump, etc DP-Exhaust: FastIntentions Custom 3”DP and Cat / test pipe section, BlackSheep Custom 3” cat back section with magnaflow resonator Suspension: VF Eng Mounts, KWV3+upratedfrontsprings, GroundControl C&C Plates, SpericalBushings ControlArm+Defcons+Poly, RearCamberBars, Uprated SwayBars Brakes: StoptechBBK 355 x 32 mm DriveLine: HaldexBlue + PeloquinRearLSD, SouthBendK70287FE Misc: Zeitronix EGT/WBAFR/Boost, Oil Temp/Pressure, Setrab oil cooler and oil filter relo, adjustable FPR/fuel pressure gauge Cosmetics: OSIR Fenders, SGI Carbon rear, 5PointHarness, race seat, custom front splitter, Black UFO, Black PC ValveCover, clear corners

09-27-2008, 06:51 AM	#4
A400 AudiWorld Super User Garage is empty, add now Join Date: Sep 2003 Posts: 3,931	Log your cam sensor thru a misfire sequence. Does engine backfire @ any point? __________________ Whole lotta car

10-03-2008, 10:29 AM	#5
TTransport AudiWorld Senior Member Garage is empty, add now Join Date: Sep 2004 Location: Round Rock TX Posts: 1,614	Re: Log your cam sensor thru a misfire sequence, do you know the vag block? I know 014/015/016, for misfires, but what do you log for the cam / hall sensor? __________________ MyFotki: Lots of Pics <u>2001 Audi TTQRoadster RavenBlack 2.2L->BT: </u> Motor: 2.2 forged Crank/Rods/Pistons, Girdle & deck cooling, Custom QEDpower Head with Schrick cams and Cat springs Forced Induction: GT3071R-WG-86AR-90TrimTurbine, DelRio Race Intercooler, DelRio BT Piping, Evo VFlo+ B5 S4 MAF, APR Bigport Intake ceramic coated, R32ThrottleBody, CoolingMist WaterMeth, larger injectors, fuelpump, etc DP-Exhaust: FastIntentions Custom 3”DP and Cat / test pipe section, BlackSheep Custom 3” cat back section with magnaflow resonator Suspension: VF Eng Mounts, KWV3+upratedfrontsprings, GroundControl C&C Plates, SpericalBushings ControlArm+Defcons+Poly, RearCamberBars, Uprated SwayBars Brakes: StoptechBBK 355 x 32 mm DriveLine: HaldexBlue + PeloquinRearLSD, SouthBendK70287FE Misc: Zeitronix EGT/WBAFR/Boost, Oil Temp/Pressure, Setrab oil cooler and oil filter relo, adjustable FPR/fuel pressure gauge Cosmetics: OSIR Fenders, SGI Carbon rear, 5PointHarness, race seat, custom front splitter, Black UFO, Black PC ValveCover, clear corners

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