Yet Another Deka 60Lb Idle Thread...

[shrunk]

Hi,

I've recently had a tune w/ deka 60's.

I've had to make a couple return visits to resolve some minor issues, most of which have been sorted (stall when changing between park, neutral, drive etc).

Had an idle issue, where it would stall when coming to a stop, this was resolved at the expense of poor drivability when cold (a couple tables were changed, not sure which, but they caused it to feel like the handbrake was half on when driving cold).

These tables were returned to their original values, and apparently some 'extra air added around the 650rpm mark' to help idle.

I can say it seems to idle and drive very smoothly, except occasionally revs dip really low (almost stalling) when driving at very low RPM (on/off the brakes in traffic) and I'm getting the occasional (once or twice a day) stall when coming to a stop.

I've read several threads regarding possible causes, mostly around low slope, high slope and battery voltage offset - before possibly offending my tuner (who I must add has been very helpful and just as eager to resolve this as I am) by having a newb give him suggestions, I just wanted to confirm if my symptoms are possibly related to the slope / battery offset suggestions (as per http://www.fordxr6turbo.com/forum/topic/55584-why-tuners-hate-60lb-siemens-dekas/)

FYI - Throttle body was cleaned at time of tune. Car had actually stalled 2 or 3 times previously, in the 2yrs I've owned it, only when quickly flicking from park to drive immediately after starting (car automatically revs a bit following ignition, and had stalled if I flicked into drive while revs were dropping down to idle). But since tune, about 10 days ago, stalling is a daily occurrence.

Thanks

[JETURBO]

Whose tuning it ?

[shrunk]

Sorry, I failed to specify... I'm in New Zealand (Christchurch)

[JETURBO]

This injector has had a good and bad rap aver the years and I believe some tuners still basket this injector like an old style injector in regards to opperation, that being said there are loads of tuners who can get this injector to play ball bang on, first hand experiance with this injector has been a slight adventure but the issues u speak of ( if all other mechanical issues are corrected ) are common with wrong data scalers in the tune, ( been there done that )

If your tuner still struggles mention to him to have a look at published raw data for this injector and compare it to what he is working with

[Henz]

Def a tune issue not injector issue like jet said, I had 60s and factory manners.

[Robos F6]

Same,ive had deka 60's in for 2 years and it idles like a baby

[Ralph Wiggum]

^ coughs, farts and shits itself every couple of hours??

That aint good!

[turbotrana]

Post up what injector values he is using and maybe someone who is familiar with using this injector can pin point anything obvious.

[mopar666]

Hi who tuned your car in christchurch .im in chch as well. have the same injecters

with no troubles nzefi did my car .

[shrunk]

Thanks all for your input, I forwarded the tuner some info I found on here, with some suggestions re. battery voltage offset etc and have been pm'ed some info too.

I can't rule out something mechanical being a contributing factor, as it stalled straight after he reversed it off the dyno for its initial dyno run (before changing anything). I wouldnt think the sole cause, but possibly contributing.

It's about 95% there, no coughing/spluttering, driving is perfect.... it's just maybe one in ten stops resulting in a stall, otherwise the idle feels quite smooth.

This aside, it feels like a good tune, not pushing anything too far (only running around 12.5/13psi peak) and a very smooth boost curve that drives well. Around 40 wheel kw gain in the peak and 60kw gain closer to top of the rev range. Will detail this stuff in another thread later.

I'll update this thread with the outcome.