Project: RS2 ABY

[driftin jo]

One dead coil, injector or plug won't cause this, I lost a coil once and I just unplugged the injector on that cylinder once I had identified which one it was and drove it home, 55 miles, was lumpy but did not stall and was happy, all be it as a 4 cylinder for a bit.

Sounds like some sort of sensor malfunction or wiring fault.

[Sonic]

Got problems with the s2 again... i took her out for a drive the other day with no problems at all, parked her up, then took her to work on Monday.

Mid-overtake she lost almost all power, i assumed a hose had popped-off as the cut under power, and continued the few miles to work. As i was nearing the office she started to stutter under idle, wanting to stall. I managed to get her parked up and then she died.

At this point she'd start up but stall after misfiring at idle. I thought i had a spare coilpack on me so started to swap these out, but alas i didn't, and she started idling on 5 cylinders again without issue.

When the drive home came she continually wanted to stall at idle, >1.5krpm she was fine but would misfire badly under any boost.

I managed to get her safely home, but it was a real PITA - it reminded me greatly of when i drove the car up to VRS after the first rebuild went bad, and every time you dropped off the throttle or dropped to idle she wanted to stall.

This morning she would instantly die after trying to idle. I barely had enough time to get the zeitronix sensors warmed up and reporting, but managed to see low 13's during idle whilst misfiring. i swapped out each coilpack one by one, i could hear each arcing as i removed it, and no distinct difference to pin point which cylinder might be the affected one.

Even with my spare coilpack being replaced on each cylinder there was no clear difference, so i can only assumed spark plug again despite being recently replaced.

[AlexS2CQ]

The stock ABY hose is the same part as the RS2 hose
...

The part numbers are different:
RS2 (ADU) 034133357 T
S2 (ABY) 034133357 AA

Another difference is that the RS2 airbox cover is ~1 inch higher.
Well seen on the photo.
I hope, that´s the reason.

[driftin jo]

The stock ABY hose is the same part as the RS2 hose
and when I changed to an RS2 airbox my roose motor sport
hose fitted fine. So the only thing that MAKES sence is samco
did not make a good enough copy.

[AlexS2CQ]

Thanks for reply!
Then i will buy a Samco Hose for a RS2 and so solve the problem.

[Sonic]

That makes sense - the rs2 air box with aby samco hose pictured required a 1/2" extender to fit correctly which you can't see in the pic.

The chap doing the install custom made it to fit when it became clear the hose wasn't long enough but I didn't notice until I did the RS4 MAF conversion with a different custom Roose hose.

[AlexS2CQ]

Hello!

Question
Look at this pic you´d posted:



I wonder if there are two different samco hoses?
One special for RS2 airbox and another for the S2 ABY one.
My Problem:
I took a RS2 airbox in my ABY coupe with a samco hose (from the hose kit i bought Long ago in this Forum for my ABY) from maf to K24/7000 Turbo.

But it doesn´t fit. Need a half inch more to the maf.
How can it be?

Alex

[SteveH]

BKR8EIX in mine with standard gap.....no issues

[prj]

I've never modified the gap from standard, and I have not had any issues.

[Rusty]

Cheers

PFR7B, anything above chipped RS2, I'd go with BKR8EIX.
This is just my opinion... opinions are like a.... you know

Yes, and I've observed that your opinions tend to based on experience

What gap?

[prj]

Sorry, what is PCP?

Peak cylinder pressure.

Where's the crossover for the plugs mentioned above? i.e. which ones for my chipped rs2?

PFR7B, anything above chipped RS2, I'd go with BKR8EIX.
This is just my opinion... opinions are like a.... you know

[Rusty]

Where's the crossover for the plugs mentioned above? i.e. which ones for my chipped rs2?

[sidrick]

Sorry, what is PCP?

[prj]

When does the ECU run closed loop? I understand a miss = unburnt Oxygen, which would confuse the ECU & overfueo to compensate / restore Lambda=1, which in turn could cause some funny fuelling and AFR readings. But that shouldn't make a difference at WOT right?

Correct.

As for the plugs I've never had issues and run with the Bosch ones too, are you saying that the higher boost level (2.1bar) is better suited to these other plugs? Could be an interesting experiment, I'm up for it, especially if theres 10-20hp at stake!

I would not use F5DP0R at all. PFR7B for lower PCP, BKR8EIX for higher PCP.

[Ross]

When does the ECU run closed loop? I understand a miss = unburnt Oxygen, which would confuse the ECU & overfueo to compensate / restore Lambda=1, which in turn could cause some funny fuelling and AFR readings. But that shouldn't make a difference at WOT right?

As for the plugs I've never had issues and run with the Bosch ones too, are you saying that the higher boost level (2.1bar) is better suited to these other plugs? Could be an interesting experiment, I'm up for it, especially if theres 10-20hp at stake!