101 replies to this topic

[CHILL Gone DUTCH]

dave

ive just looked over your file,

what spec is your setup.

 

 

[DaveyC]

dave ive just looked over your file, what spec is your setup.    

Wiseco 8.9:1 Pistons Eagle rods Comp cams Lsj TB Siemens 630cc injectors Anything else you need to know?

[CHILL Gone DUTCH]

Pulley size Are you using M62

[DaveyC]

M62 with 3.35" iirc

[CHILL Gone DUTCH]

in the log file, the engine barely gets up to full temp 

have you got log file with with engine up to full temperature 

 

The car behaves very differently while getting up to temp just wondered if you were getting the issue when your up to full tempreture

 

and do you think you could try and catch it on a log

[CHILL Gone DUTCH]

do you have a wideband ??

would of thought it would be a good idea if you havent  at your state of tune 

 

 

[DaveyC]

https://drive.google...iew?usp=sharing

 

That's a log of the first drive with that particular tune.

 

I'm not sure how to capture it in the logs. The engine hesitates every time I pass through the 1500-2500rpm area on gentle throttle. Any section of the log that has a small throttle opening and those rpm ranges will be when the misfiring is happening.

 

I don't have a wideband installed because OBD tuner can't actually use a wideband signal for fuel calculations so I didn't really see the point other than as a visual readout in the cabin.

[CHILL Gone DUTCH]

the wideband is usable with obdtuner for higher RPM fuel learning (via the power runs)

and in the logging files,Peter recommends it  using it for anything over 250 hp

 

this has nothing to do with your problem just a observation, do you think your issue could be some kind of cam overlap

[CHILL Gone DUTCH]

the best way capture it is to simply get car up to temp 

start logging and drive the car through the issue as much as possible 

 

we could try and alter the ignition setting around that area to see if it gets better or worse

[DaveyC]

Does it actually base fuelling on the wideband signal or is it just a readout for the operator to view? I guess it could be a cam thing, it just seems odd that I had the same issue with my old engine too. Unless it is coincidence that I had it before for a different reason.

[CHILL Gone DUTCH]

wideband is used for fueling WOT above 250hp can be used below 250hp but essential above it 

also gives data within logging 

 

would strongly recommend it,

 

if you used the same coil pack on both engines i would change that first if not we could try ignition settings around that area

 

are you running a saab engine ??

Edited by CHILL Gone DUTCH, 26 March 2015 - 06:45 PM.

[oakmere]

do you not disable the misfire detection on SC maps?

[CHILL Gone DUTCH]

do you not disable the misfire detection on SC maps?

Yes Might be worth switching it on if it persists after changing coil pack

[DaveyC]

Coil pack is definitely going to be the next thing I investigate. Isn't WOT open loop I.e. No lambda feedback at all? Or do you mean during the fuel learning session it uses the wideband since it's locked in closed loop for that? It's a new GM bottom end and the original GM cylinder head. I'll look into enabling the misfire detection. Cheers chaps.

[CHILL Gone DUTCH]

when mapping cars above 250 hp 

the WOT is done in closed loop via the power measurement and process button.

I think its to reduce the chance of the car running lean for longer periods of time in open loop

[CHILL Gone DUTCH]

section 9.8 of the instruction manual

 

http://www.obdtuner....PgDownload.html

Edited by CHILL Gone DUTCH, 26 March 2015 - 07:38 PM.

[CHILL Gone DUTCH]

sorry i got open and closed loop wrong way round in post #96

 

also read section 9.15

Edited by CHILL Gone DUTCH, 26 March 2015 - 07:45 PM.

[smiley]

http://www.ebay.co.u...=item3f47f7d673

[Bargi]

Can you get a video up of the problem. Seems strange it happens on light throttle. Does it go away completely if you tramp it?

[DaveyC]

https://drive.google...iew?usp=sharing

 

Log file with misfire check enabled.

 

Engine is mostly idling until I gently increase pressure on the accelerator then blip a few times towards the end.

 

This is a different base map (as modified by Peter) compared to the previous logs.

 

I'll see about trying to capture a video, but from experience you can usually only hear the clatter of the engine rather than the actual exhaust noise on smartphone audio.