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Rb20det Problems

Rancher

By Rancher,
in Engines & Forced Induction

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Rancher Community Regular

Rancher

Posted
Posted (edited)

So I finally got my RB20DET into my S13, wired up and what not. The problem I'm having now is she doesn't seem to want to hold the revs. like, She'll rev up past 3. But when I hold it there, it seems to drop in revs cough a little then go back up to 3. Blowing dick loads of black smoke on 3 as well. I have a vid, but I just have to post it on youtube to show my problem.

Any idea's? I still gotta get the clutch to work, but I'm still a little worried about taking her out for a drive for the first time.

Standard injectors,

Hotpipe (Untill I find someone who will custom make my intercooler piping)

No exhaust on it untill I can be bothered.

Standard turbo and actuator.

AFM is plugged in, but it was the one that I was using with the non-turbo motor. Green label. Hotpipe, no intercooler, straight from turbo to manifold. Running low boost. I'm thinking that perhaps the fuel has gone stale, and the timing is off?

I suppose I'll hook up the boost guage and see if its coming onto boost. The blow off valve seems to release air though, so I'm sure that the turbo is actually spooling.

Please help!

Edited by Rancher
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https://www.sau.com.au/forums/topic/182158-rb20det-problems/
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abu Grand Master

abu

Posted
Posted (edited)

Have you checked the timing?

And the rev's could be due to TPS being out, was it removed?

Double check the timing, the CAS could be out of place.

Had a similar problem SR20DET, was the TPS thats why the revs where up and down, and as for blowing smoke that what the timing.

Hope that helps.

Edited by abu
Rancher Community Regular

Rancher

Posted
  • Author
Posted

AFM is plugged in, but it was the one that I was using with the non-turbo motor. Green label. Hotpipe, no intercooler, straight from turbo to manifold. Running low boost. I'm thinking that perhaps the fuel has gone stale, and the timing is off?

edited in main post as well.

Rancher Community Regular

Rancher

Posted
  • Author
Posted

Yeah I brought the car with a non-turbo RB20DE in it. I brought it for the sole purpose of putting an RB20DET in it. Dont ask me why the guy I brought it off put on nin-turbo one in it lol. Ive fixed the problem by putting a turbo one in.

Gonna go have a play with the CAS now. I'll let you know.

abu Grand Master

abu

Posted
Posted
Yeah I brought the car with a non-turbo RB20DE in it. I brought it for the sole purpose of putting an RB20DET in it. Dont ask me why the guy I brought it off put on nin-turbo one in it lol. Ive fixed the problem by putting a turbo one in.

Gonna go have a play with the CAS now. I'll let you know.

Make sure you check the timing first with a timing gun, before you go playing with the CAS.

I reckon its the CAS personally, a long with the TPS.

Rancher Community Regular

Rancher

Posted
  • Author
Posted

More problems....

I just took her out for a drive...

Wouldn't come on boost. She warmed up and stalled. Wouldn't start. I have a theory that the NA FPR that I have used is too different. I'll plug my SARD rising rate in (At what PSI should it be set at at idle?) And the stalling seamed to be caused by the coolant temp sensor. Perhaps the coolant return line I have going to the heater hose (I have the heater hose in a circle, no heater) is registering as flamin hot and its killing the motor.

Can people confirm my theory? Any idea's on where I could plumb back the coolant return for the turbo? It DOES NOT have the stock return line for some reason. So don't say that lol.

PLEASE PLEASE PLEASE help me. Ive pored thousands into this, I'm losing motivation to fix it. Help me!!

Heck, I'll pay for meals, accommodation etc for someone to come out and help me!

GunmetaL Enthusiast

GunmetaL

Posted
Posted
More problems....

I just took her out for a drive...

Wouldn't come on boost. She warmed up and stalled. Wouldn't start. I have a theory that the NA FPR that I have used is too different. I'll plug my SARD rising rate in (At what PSI should it be set at at idle?) And the stalling seamed to be caused by the coolant temp sensor. Perhaps the coolant return line I have going to the heater hose (I have the heater hose in a circle, no heater) is registering as flamin hot and its killing the motor.

Can people confirm my theory? Any idea's on where I could plumb back the coolant return for the turbo? It DOES NOT have the stock return line for some reason. So don't say that lol.

PLEASE PLEASE PLEASE help me. Ive pored thousands into this, I'm losing motivation to fix it. Help me!!

Heck, I'll pay for meals, accommodation etc for someone to come out and help me!

Your first problem is that it sounds like your scimping on money. You have to have it all installed properly and working as it should be before you can guess at why it may or may not be right..

GET a turbo FPR and then get a turbo everything else...

Why is the heater in a circle?

The stock return line for the turbo enters under the intake plenum

Youve also got no cooler so that'll be making it run hot as hell

S13's have bad airflow enough as it is.

My mate had no intercooler on his 180sx when he first put his rb20 in and it pinged its tits off.

The stale fuel and wrong afm wont help either.

You really have far too many variables and things that havent been done right or finished for people on hear to offer any effective form of diagnosis.

Rancher Community Regular

Rancher

Posted
  • Author
Posted

I now have a SARD rising rate FPR in there, the heater is in a circle because like i said. There is no pipe for the coolant return. I'm running with no bonet on atm so I dont really see I drama. Nor is it pinging atm. I thought the NA and turbo AFM were the same? that the only reason Ive used it.

QWK32 Veteran

QWK32

Posted
Posted

hot pipe should be ok, just don't boost it! i've help a mate solve a problem the same as yours but with a rb20det in to vl. fuel send and return lines to the fuel rail were hooked up the wrong way round.

just to clear things up did you turbo the na motor or swap the motor for a rb20det?

also have you bled the coolant through through the motor, removing any air pockets. an over heating motor will stall and fart and carry on

Rancher Community Regular

Rancher

Posted
  • Author
Posted

It is a turbo motor. Yeah the coolant has been bleed through. No problems with that anymore. It stays a nice temp. She just wont boost... It sounds like (Cause I live in the sticks, I dont have an exhaust on it, or a bonet lol) 4500RPM you can hear the turbo but only reads on the gauge as 1PSI... then at about 5 it sorta changes note... The wastegate is not opening. I have the pipe off to check that.. I'm getting frustrated lol. I'm sure even if it was stale fuel it would hit boost harder then 1PSI...

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