Need Your Wisdom Asap. What Is This?

[studricho]

I have finished my car and this was left out. My sparky said I didn't need as it was for the boost gauge for the dash. To me it looks like a map sensor and it could be the cause of the issues with my car.

Please go easy on me as I'm a complete noob when it comes to RB25 engines.

The symptoms are-

-Weird idle once the car is warm

-Breaks up on light throttle over 4,000 rpm

-Forget about any hard throttle..not happy.

From my understanding this device coverts manifold pressure into an electrical impulse for the computer to make it's adjustments..correct me if I'm wrong.

By the way. I'm running everything standard R33 stuff.

Your help would be fantastic. I have diagrams, but I can't find it. Anyone have a pinout number for the computer on this by any chance?

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[axe s]

yeah it's for the standard gauge....

i think that you might need it if your running a standard ecu...

[studricho]

yeah it's for the standard gauge....

i think that you might need it if your running a standard ecu...

That's what I think too. Now just to find the wires....

[lachlanw]

nah you do noto need it . it is for standard gauge . the ecu has its own boost sensor out of the j pipe . well the neo does . dont think non neo does

[lachlanw]

pretty sure you have a vac/boost leak somewhere . or a shot /nearly shot air flow meter

Edited February 16, 2009 by lachlanw

[QWK32]

thats not a map sensor, rb's use a MAF, it will be just after your air filter. that is just the boost sensor for the stock gauge like others have already said.

[studricho]

pretty sure you have a vac/boost leak somewhere . or a shot /nearly shot air flow meter

Is it possible to clean it?

[QWK32]

yep with electrical contact cleaner.

[The Dan]

It is a map sensor.

It only operates the standard gauge so not required.

light throttle and 4000rpm breakdown sounds like a fuel issue. Check fuel flow before and after the filter. Do a pressure test and see what it does while driving and breaking down.

You could also have a second issue with the 02 sensor or the coolant temp sensor. Check these with a multimeter.

Also do as suggested above and check for vac leaks.

[studricho]

Thanks for all the replies so far. We did find one issue tonight..Over boosting. I found that the standard boost solenoid has an issue. I bypass this and now the boost/waste gate is working as it should.

It's still surges a bit, but much better to drive now. I had a quick look at the timing tonight cause I've changed the timing belt before the engine went in. I don't think it's right so I'll see someone about it.

I need to check the fuel filter as this car has been off the road for nearlly 9 years. Even though the filter was new when I put this engine in it may be full of junk.

Is there someone in the gong that you could recommend?