R33 Running Lean!

[V8EATER]

I recently fitted an Auto Meter air / fuel monitor. I found that when the turbo boosts up it leans right out to the point where it's dangerous.

Ive gone back to stock boost for now and it's a little better but still lean.

I bought a Malpassi adjustable rising rate fuel pressure regulator & gauge but found that when I went to fit it, the original regulator makes it hard to replace. Where you take it off there is no way to fit a hose connection. I have an adaptor coming express so will be able to fit it soon. I have seen a lot fitted on different cars and some are fitted with the adjuster screw & vacuum line pointing up. Iv'e seen others with it facing down. Does it make a difference?

I also bought a Bosch 044 internal fuel pump for it which I will fit this weekend.

Has anybody had similar problems with their RB25DET? If so how did you overcome it?

...and please dont say the words "ECU" or "Injectors" <_<

Any help much appreciated.

[Dose Pipe Sutututu]

leaning out aye?

whats done to your car? if its pretty stocko.. I'll have a look at your crank angle sensor.. maybe its had it and playing up hence the leaning..

bring to mechanic.. check it out....

hope that helps

[V8EATER]

Heaps of mods. That's the problem the whole fuel system is stock so it's starving to death. Should be sorted soon just need the right fittings for the Bosch 044 and adjust the reg.

[blind_elk]

Should be better once you fit the 044.

If you need an adapter for replacing the FPR, talk to Steve at EFI Hardware - he can supply them so you can fit the Malpassi. I don't think it matters a bit which way up you mount the Malpassi.

[V8EATER]

Thanks blind_elk,

Yeah ive heard the Bosch 044 should be more than enough to solve the problem. Just need the right fittings (thats the hard part). Ive bookmarked some threads here where people have said what parts I will need and where they got them. Im in Perth too so I hope I can find the right bits. We have an Enzed here I think? Hopefully they will have what I need. For anybody reading that has done this conversion to a 33 I have this question...It is obviously better to have an almost empty fuel tank to do the swap. Ive looked at the tank under the car and its mid mounted and on the passenger side kinda. Would it help to do the swap with the car on a forward incline? I want to be able to see right down to where the pickup sock sits (if that's possible). Ive read some threads and see that a lot of people start running out of fuel sooner than they should because of a high pickup point. To avoid having to remove it again I want to get it in right THE FIRST TIME.

I have an adaptor coming express for the Malpassi so will be able to fit it soon. I am getting it from Tweakit.net. It replaces the stock fuel reg altogether. I have read some people leaving the stock one in place and running the malpassi after it. I dont like that idea at all. Will be good with the adapter, i can mount the reg away from the fuel rail and connect direct to the fuel rail once the adaptor is on.

[TommO]

Have the fuel pressure tested

I found my RB25DET to be running lean and it was due to a dying fuel pump...

Replaced it with a Walbro one and it was great after.

[V8EATER]

I should be able to check the fuel pressure on the regulator. I got a guage for it (goes to 150 PSI from memory). Ive seen figures thrown around in the forums. Seems to be 40 psi @ from what I read. At idle? Ive never used an aftermarket reg so I got no idea on the right figures.

http://www.skylinesaustralia.com/forums/in...topic=10559&hl=

http://www.skylinesaustralia.com/forums/in...topic=28520&hl=

Still confused...

Got the adaptor yesterday so I can get the malpassi up and running at least and see what pressure its running.

Are the Walbro a good pump?

I was going to buy a Walbro but didnt know much about them so I got the Bosch 044. Then I read all over the internet that the Bosch can be unreliable or break down early? Ill just get it in and cross my fingers.

[gtrken]

My suggestion would be to get it onto a proper fast acting wide band lambda meter, ie. the type you will find at a dyno shop.

I think those Autometer a/f meters are a bit hit and miss.

I would be using a Bosch 044 over a Walbro pump and haven't had too many people complain about the ones we have fitted.

The walbros that come in on customers cars on the other hand...

Cheers

Ken

[V8EATER]

OK...I think I have a list of everything I need to do the 044 install...

Banjo fitting for top

Fitting and hosetail connector for bottom

Stainless steel clamp (70mm) for pump to bracket

Fuel hose clamps

Fuel hose (1/2 inch for top, 3/8 for bottom)

Larger power and earth eyelets (solder on)

I referenced several threads for the info...

http://www.skylinesaustralia.com/forums/in...showtopic=20800

http://www.skylinesaustralia.com/forums/in...topic=30069&hl=

http://www.skylinesaustralia.com/forums/in...topic=27385&hl=

http://www.skylinesaustralia.com/forums/in...showtopic=85375

http://www.skylinesaustralia.com/forums/in...showtopic=62651

The only thing I couldn't find anywhere is if anybody used a check valve with the 044 ???