Did you have to have a custom map to suit this head?
Ive tried 2 chips now and its running very lean on light throttle/ low revs (AFR 18+) lean enough to make it cough and splutter until i give it more throttle and off it shoots.
I have a feeling that when i bought the head Steve PSD said that it flows better than a big valve head at low revs but cant remember for sure.
Has anyone else had this problem with a CNC head and had to have a custom map to sort it out?
Cheers
Rob
TBH I didn't know anyone who has had a CNC head. Either way it won't be the head causing it cough and splutter.
You don't need need a custom map to suit a modified cylinder head as such. It's only really if you go big valves and a totally different cam that things might need tweaking for optimum with the map.
hmm, your issue kind of sounds like the same thing I'm getting with my polo since the turbo conversion. I put it down to needing a remap which it's getting this week. I also want to get a fuel pressure gauge on it
Same happens on mine with a PSD map and red top injectors. Idles spot on and revs well, but slight partial throttle it stalls the engine.
Custom map time.
I know its a bit off topic but does someone sell some software so you can map the digifant system your self?
Dan - like i said i think a cnc head flows more than a big valve at lower revs, so map might just need a little tweak. I have also just fitted a four branch too.
hayesey - I read your post about you problem i thought it sounded like mine! I removed the boost gauge from the vacuum pipe just to see and there was no difference.
Is Andy mapping it? Wonder how long it would be before he could map mine as i know he is very busy.
Nick - defiantly sounds like the same problem, its so annoying as it does it at cruising speed! Idles good, pulls away good then just as you are cruising it wants to cut out >:(
Tommo - you can buy the software / hardware to do it but ive no idea where.
mine does it most as you set off and below about 2.5k rpm, above that it cruises fine. Tonight I unplugged the lambda and it's a lot more drivable now, kept the AFRM connected to the probe and it's showing more sensible afr too. So I'll keep it like this till it gets remapped on friday. That's only going to be an initial map done on the road though, at a later date we'll hire a proper rolling road for a day and do it properly.
Bit like mine at the mo too.
Pull out of a junction and its spluttering until i floor the acclerator. If i'm lucky, the engine picks up. If not, the engine stalls.
Looks like Andys gonna be busy for a while ;)
mine doesnt stall and if anything picks up better if I'm really gentle on the throttle. I'm sure Andy will make himself as busy as he wants to!
Quote from: Tommo on June 15, 2009, 04:48:51 PM
I know its a bit off topic but does someone sell some software so you can map the digifant system your self?
Yes, not just software - but hardware too. At the very least you'll need a suitable chip emulator and a wideband lambda setup on top of the software. Not cheap.
hayesey - yours does sound different to mine now if it revs better the lighter you are on the throttle.
Anybody know what voltage the narrowband lambda sends to the ecu?
Ive got a aem wideband controller that ive set to emulate non-linear nernst cell 0-1v is this right?
Quote from: Andy on June 16, 2009, 12:37:50 PM
Quote from: Tommo on June 15, 2009, 04:48:51 PM
I know its a bit off topic but does someone sell some software so you can map the digifant system your self?
Yes, not just software - but hardware too. At the very least you'll need a suitable chip emulator and a wideband lambda setup on top of the software. Not cheap.
I already have a descent wideband setup. Having to use a chip emulator is a ball ache, With Nistune you plug it into your ECU and map that directly. Not to worry.
yes 0 - 1 volt is right for a narrowband. Although I think people have struggled with the narrowband emulation before, prob best to weld a 2nd boss into your exhaust and have both lambdas in at the same time. I've already welded 2 bosses into my downpipe, just not bought a wideband yet!
Hayesey, I can reccomend the AEM wideband setup. A god bit of kit, comes with some good instructions, everything you need, quality bosch probe, and some stickers for your toolbox! ;). I got it because a mate has had one for years in numerous daily drivers and its never let him down.
Just one problem with it, on startup the central display reads 'poo'. I have no idea why :D
Quote from: Tommo on June 17, 2009, 09:29:35 PM
Just one problem with it, on startup the central display reads 'poo'. I have no idea why :D
So they rate their products then!! :D
Did you source it from the UK or get it shipped over? I looked at these a little while ago after a few people said the Innovate LC-1 was tempremental. Is it the full kit with gauge you have?
I know Zeitronix are good but pricey. What sort of price is the AEM one?
Theres a AEM Kit on Ebay for £210 posted, thats in the UK too so no tax. Listed at $242 on the AEM site.
The AEM kits are controllers and gauges in one unit. The Zeitronics stuff looks to be dearer and also more advanced. Performance5 are listed as being the Uk authorised dealer. The controller and the gauges come seperately and the digital gauges give various readings. The contoller alone is listed by Performance5 at £239 then you have to get a gauge on top of that. Got to say that the Zeitronics stuff does look good though! I have a friend in the states that can probably send me the stuff over tax free!
i got an innovate lc-1 about 2 year ago for 180 pound ish never went wrong on me they only break if you mount them on the wrong angle or too close to a hot spot.
Think i paid around £180 inc shipping. Got it from usa when the pound was good.
My AEM was £19posted off UK ebay.
They're all fairly crap to be honest when compared with proper OEM diagnostics- I have both the Zeitronix and the Innovate, there's not a huge amount between them.
Zeitronix has a fancy LCD screen, which if you have the extra sensors you can display EGT and Boost aswell as Lambda and A/F ratios- all good stuff, I bought mine about 4 years ago for setting up my nitrous system on my GT, still working well today.
Polo Performance Parts recently purchased a full OBD Innovate Wideband set-up, which is packaged to suit ease of movement between cars, with the OBD functions it's a very powerful tool on more modern metal, but is slightly wasted on the G40, time will tell how it fares.
As Tommo says, it's good to get one that has a generic Bosch probe, can get them for about £50 then :)
Quote from: Yoof on June 22, 2009, 10:05:41 AM
Polo Performance Parts recently purchased a full OBD Innovate Wideband set-up, which is packaged to suit ease of movement between cars, with the OBD functions it's a very powerful tool on more modern metal, but is slightly wasted on the G40, time will tell how it fares.
they are not cheap!