Andy.F

Anyone ever flow checked a "380" injector from a 95 RA ???? I suspect that they flow quite a bit more Either that or my new 550's are not 550's !!!!

Ran with my new 550's and remap for the first time today, initially promising when the torque built at 4000 and all 4 spun in 4th !! but things went downhill after this
Knocklink went crazy, AFR was 13.5 at WOT, I got severe det anything over 4k as the AFR dropped off to 14.5 Coming off/on throttle I got fuel cut ???? EH ?? I have a FCD
Open loop idle was 15.5 and cruise was a somewhat lean 17.8

Tried the 550's on the standard map and it started ok, Idle AFR rich at 11.5, open loop cruise 12.5, WOT 4k 11.2 and WOT 6k 11.8 and pulling very well for 1.5 bar........until, fuel cut ?
I disconnected the MAP pressure line and tried again. It would lean out and stumble as soon as I went +ve boost I thought the MAP sensor was only used for boost control ??

Lots of confusing messages here, have not quite worked it out yet.

Appears that my new injectors are only about 16% bigger than my old ones ? So either my new ones are only 440's or, my old original grey ones were 470's ??????

Very strange......

I'm off for a drink !

Katana

Um, you're confusing me now! For starters I thought the MAP sensor only sense boost an is used for the overboost cut! And now you're running leaner on 550s when compared to 380s? Was it the standard injector in your car?

Andy.F

No, not leaner, just not much richer. AFR measured via wideband, run 1 was with fuel remap to suit 550's, run 2 was with the original fuel map but still using the 550 injectors.

See, told you it was confusing !!!

Tone Loc

iTrader: (1)

Andy... who mapped the ECU?

Tony.

Katana

You're now stressing me out and I'm supposed to be on holiday! In theory, you would've thought that it'll run richer wouldn't it? Looks like its time for you to fiddle with the excel program for this christmas, remapping everything. Then pass it to me as I was thinking of getting 550s myself.

Andy.F

It's the same map that David Wallis used sucessfully with his 550's

I suspect the RA ECU is doing things a bit differently ??? Using MAP as well as MAF for fueling ???

Katana

Oh cr*p, I've blocked out the whole signal from my MAP sensor with my FCD! I better check it out tommorrow morning before doing my daily overtaking thing. No wonder the CEL comes on once in a while..

Andy.F

Mine just would not run even 1 psi boost without the MAP signal ? It just went very lean (AFR 18 on WOT) and eventually cut out.

Katana

We have a similar model WRX RA right? Not the STI RA. Are you sure your CEL wasn't on? Thats what happened to mine when I removed it (okay bad connection as I was too lazy to solder it) and it refused to go on boost, giving an overboost like effect. It happened even though the light went out so this could be it?

Pavlo

emailing me was possibly a better move in the first instance.

yhm with my home phone number, and we should get this sorted.

Paul

LG John

As usual you lost me in the technobably.......BUT:

THAT, I like Hope you get it sorted out Andy

JamesS

Interesting....I had a boost-cut/fuel-cut type event which (for various reasons) I believe was triggered by water getting on the MAF, meaning rubbish MAF reading at that point in time.

car has FCD as you say....I was wondering if a WOT MAP signal, not within a certain range of the MAF signal, triggers a fuel-cut saftey.

Another thread I picked up earlier mentions fuel-cut with a knackered MAF sensor.......but its MAP based surely......

Pavlo

it's feesable, but would be airflow, and therefore HP related.

I would be surprised if andy is suddenly getting 400hp at 4000rpm.

Maxing out the maf sensor is possible though.

I'll have to work with andy on this. What he describes is nothing like the experiences of David Wallis' car, so very different I think there is something fundamentally odd.

ECU should be fine, as the new eproms replace no only the mapping info, but the software code too.

Paul

deanmachine

I had a problem with the remap in my 94 RA when using the original ECU (W9).When ever the boost got over 1 bar/1.1bar i would hit fuelcut even though cut was set higher in the remap. I have switched to a Z4 ecu now with the same remap and it is fine, I don't really know the tecnicalities of it all so have a word with Scott T as he sorted most of it for me.

Scott

Pavlo

I suspected something may have been amiss in the ECU dept.

need to download an RA ecu image.

Anyone down south with an RA and an hour to spare?

Paul

Katana

Define South? I'm in Oxford and I'm free after Monday as I broke up from uni today. Monday any good?

RA Jaay

Andy, youll have an uprated fuel pump I takeit ?

David_Wallis

RA Jaay... LOL

OI, Who Said you could use my old map???
Eh.

Eitherway mine ran fine apart from a bit of det and idle problems due to the iscv... I know this is stupid but no fault codes I take it?

Your not running 7th injector anymore?

MAF constant?? Due to front entry?

what base fuel pressure you running, I was running a webber escort cossie fuel pressure reg. 1:1 or 1.1:1 ??

I would like to see this sorted, so let me know either way as I want your map when its done

I can lend you my box to download the map if necessary..
Paul / Andy keep me informed please

David


[Edited by David_Wallis - 12/14/2002 11:20:59 AM]

Katana

RA Jaay, David, you talking to me? I'm confused here as I too am an Andy.

edit: yeah i've got the uprated fuel pump.

[Edited by Katana - 12/14/2002 9:11:43 AM]

David_Wallis

didnt scott think this was down to the regulation on the map sensor supply line and getting a non linear response from the map sensor??

deanmachine

While we are havng all this talk of RA's has anyone got a definitive answer for the 5th Injector? Does it work or not???? I assume mine currently isn't as i am using a Z4 ecu from 95 wrx.

Scott

Andy.F

Paul - Your Email didn't arrive until this morning ! I'll call this evening if that's suitable ? Didn't want to call this morning in case you'd been up all night with more important things !!

Andy, better call me Andyf then ! Yes I have an uprated pump and regulator.

I'm not sure if it was exactly the same map as yours David ? I think Paul used the same fuel constant to adjust for the bigger injectors..........guess only paul knows that !

I have a few chipsets with it to try out, as I have a rising rate regulator which makes mapping 'interesting', Paul flashed a set with Baseline, -5% , -8% and -10% fuel. I initially fitted the -5% (call it an uneducated guess ) I was in the 14 - 15 AFR range on power I then fitted the baseline chips and got the results posted above. Slightly richer but still approx 18% weak.

The 5th injector does nothing....ever ! I checked this with the wideband, injector unplugged gave me exactly the same results.

Injectors 6&7 were worth approx 10% extra fuel and were only required over 1.5 bar boost.

This all leads me to believe that my original injectors were bigger than 380cc ??

Also, this fuel cut with a FCD is a bit strange ? MAF limit ???

Pavlo

I think I might have screwed up regarding the fuel cut, but nothing a slight adjustment of the FCD wouldn't fix for now. I forgot we had a different MAF sensor on David's so the boost limit might appear to be low.

Is the 5th injector still plumbed in?

What if the injector was normally on? Unlikely, but you can see what I'm getting at.

Still using that rising rate jobbie? I wonder if the larger injectors will have a bearing on maintaining fuel pressure.

Have you checked the fuel pressure to make sure?

I can't see that RAs would have bigger injectors, as Scott.T has put an off the shelf map into an RA, and no problems were encountered, it would have run rich as hell otherwise.

You can phone me anytime today (saturday).

Cheers

Paul

David_Wallis

just to confirm that I have a different map sensor not maf sensor..

David

Pavlo

yeah, oops, MAF sensors on the brain

David, I think you need to check your fuel pressure....

Paul

Katana

Pavlo, do you need my 95 RA by any chance?

Pavlo

probably not Katana

Katana

Not a problem then. You sure you don't want to find out how to make the 5th injector to work?