E30 Rb25 Setup Issues

[Timcgt]

Hey guys,

I have a bmw e30 coupe, with a rb25 and 5 speed setup out of a r33. It has (from what ive been told by prev owner) gt30/76, upgraded injectors, fuel pump, 3 inch tbe, haltech platinum pro plug in. Was meant to be making 270rwkw, but that was on a dyno dynamics dyno, i did a run on a mainline dyno and made 240rwkw with very safe afrs, and a touch of wheelspin. (18psi)

I am having a huge misfire at about 3000rpm under load, if i baby the throttle on it doesnt misfire at all, i had heard the coilpacks are known for issues. So i have swapped in some yellowjacket coilpacks but with no difference.

I have fixed a few issues, the install was a bit shoddy. not impressed with the work done to be honest.

I dont know where it was tuned, i have the haltech ecu manager but honestly dont have much of an idea as to what i am doing lol.

it also doesnt run a afm or oxygen sensor but it was very safe on the dyno run so im not overly stressed about the tune.

Where would you recommend a retune in adelaide?

Any ideas on the misfire guys?

Cheers for any input!

[boostn0199]

Check your plugs on the missfire, which ones are they and what gap?

[Simon-S14]

Declan from garage 7. Both an rb and bwm fan he is

[Manuel Kasko]

Put some gapped plugs in .8

See if this helps

Also make sure they are cold plugs

[Timcgt]

Ah ok it has .7 gap plugs atm not sure on type, what do you mean by cold plugs?

[DVS JEZ]

I think it will be in the haltech. Dori34 is having a similar issue that i need to check.

Does it do it everytime? In all gears?

[Timcgt]

Yep if I go wot in every gear, but I can ease it on and it's fine

[Timcgt]

What heat range plugs should I get? And Iridium or platinum?

[boostn0199]

What heat range plugs should I get? And Iridium or platinum?

Neither iridium or platium just the copper ones. The one you want are ngk bcpr7es they are alredy gapped to 0.8 aswell.

[JustinP]

Can you post some pics of this thing? I would love to do an E30 with something like an RB25 in it.

[Timcgt]

Cheers mate, yep I'll bang some pics up this weekend

[Timcgt]

[DVS JEZ]

Love the stealth cooler

[Timcgt]

Haha yeah.... Need to do something about that, not sure whether to try waic or try running 2 small coolers on either side, don't have much room to play with

[Simon-S14]

can the motor not be mounted furtherback? looks like theres heaps of room behind it

[Candyman69]

so does it have a map and air temp sensor?

miss fire will generally be more erratic and not at a specific rpm.

When you say huge miss fire does it feel like it cuts out? misfires are generally less aggressive as it sounds with you

what psi is it at 3000rpm?

what turbine housing size? waste gate? boost control?

vct working?

has is always been like this since ownership or just recently?

need more info bout your car my friend

Edited July 1, 2012 by Candyman69

[Timcgt]

Doesn't run a maf sensor, doesn't run an oxygen sensor, it hasn't always been there, it's what I would call a misfire, fullpower, to nothing then full power, might do it twice and then its all good all the way to 7300,

It does seem to be getting worse, I will try plugs and see what happens.

Turbo I was told is a gt30/76, other than that I don't know. How can I check vct? It is all good if I ease into it.

I'll go for a squirt and have a go at data logging it later today so I know exactly what psi it's at

Haha yeah it 'looks' like there is a bit of room but I've run out of space in the tunnel so would be a massive job to move it back to get the cooler hidden

[Timcgt]

Cheers for the input guys, bit more helpful than a couple other forums I've been on

[Timcgt]

Could it be boost cut, it is overboosting now, it used to spike a tiny bit but now it is flat out

[DVS JEZ]

Its possible. But without seeing the tune its hard to say.

Tried turning the boost down?