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Rb20 Driving Like Shit.

bubbabooga

By bubbabooga,
in Engines & Forced Induction

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bubbabooga Rising Star

bubbabooga

Posted
Posted

hey all..

sterday at a mates workshop we found my water pump was leaking so we replaced it and having to move the crank angle sensor, once all put back together the car wouldnt fire.. gave the plug on cas a wiggle and she fired up but not sounding to good... took it for a drive and it feels like it has about half power to what it used to have... whilst going threw the rev range seems to jerk around a little... maybe like timing advancing and retarding...??

so annoying.. thought maybe could just get a remap and a workshop to sort it out but i dont wanna be speding thousands on them searching for the issue..

is it possible to put crank angle sensor back on wrong???

any help appreciated

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r32drifter1 Apprentice

r32drifter1

Posted
Posted

i had troubles like this with my old 20, my CAS was faulty. but the most simple solution could just be you put it back on wrong, did you make sure it was in the exact same position it was on before?it doesnt need to be that far off for the car to run like shit

bubbabooga Rising Star

bubbabooga

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well it was at a mates workshop and he said it can only go on one way.. like the splines on the crank angle sensor could only be put i the same position every time... i was a tad sceptical on that but let him continue on..

iv used co2 cantact cleaner on the plugs for cas and the ignition amps and cold start and acc valve plugs but still nothing...

r32drifter1 Apprentice

r32drifter1

Posted
Posted

yeah hes right the car wont start if the its on the wrong notch. i mean you adjust your timing by twisting the sensor left and right. i cant remember which way retards it and advances. but once you have the sensor on you have to make sure its on the same angle as before, you should be able to see where the 3 bolts which hold it on used to sit to show you what position it used to be in. your friend is talking about the little notch which stops you from putting the sensor back on the wrong teeth

bubbabooga Rising Star

bubbabooga

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yeah yeah that was what i ment so we couldnt get it on the wrong teeth..

and yeah we did line the 3 bolts that you use to adjust the cas back to the exact same marks that they were on...

used to run beautifully till then... so lost with what to do?

bubbabooga Rising Star

bubbabooga

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yeah i just checked all the pins and their both perfect on the male and female plugs....

it occasionally drops idle to 400rpm then bounce up to 1200rpm when ever it wants

it is not the aac valve as iv already looked into that... it wasnt f**kin around the idle before the change water pump and timing belt...

?? :S

bubbabooga Rising Star

bubbabooga

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yeah i have my own timing lights... can anyone give the stock timing figures it should be set to...

when we put cas back on we made sure it was exact same position by finding the marks from the bolts and putting it the exact same marks... fair sure its the same but its worth a check...

how much advace does annyone run.. fair mild setup..

just got 3inch 1 resinator bleed valve pod and fuel pump...

recomened max advance??

i have bb rb25 turbo ready to go on with greddy front mount kit and nismo fuel presure reg which i will just get a different workshop to put on so they can give me a remap and tune to suit...

bubbabooga Rising Star

bubbabooga

Posted
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and one more thing..

what sort of gains have people had from ecu remaps...

i know they would iron out the power curves and that make em more reliable but what sort of gains can be expected?

cheeers yo

ZENNON Grand Master

ZENNON

Posted
Posted
when we put cas back on we made sure it was exact same position by finding the marks from the bolts and putting it the exact same marks...

ah ok - thats good then - as for your other questions - lotsa info on SAU - just gotta search for it :(

probably find some good info for most of your questions

Beer Baron Grand Master

Beer Baron

Posted
Posted

stock is 20 degrees advance BTDC @ 950 rpm. check it with your timing light. I can almost promise that the CAS wasn't put in exactly the same spot as before and your timing is now either too advanced or too retarded and is making it run poorly. check timing, loosen the 3 bolts and roate the CAS position as needed. it doesn't take much movement to affect the timing and the way the car runs.

abu Grand Master

abu

Posted
Posted
Serious.. ffs last time I set the timing I put it at 15BTDC.. unless my tuner changed it, but I'm not touching the base timing because I've had a remap and it will likely ping its' head off!

ah damn thats not very good

I'm pretty sure my information came from the old rb20det.com site but I remember checking my timing on the PFC hand commander and also with a timing gun when I initally got the car and it did match what I had written down.

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