Jump to content
SAU Community

Recommended Posts

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
Link to comment
https://www.sau.com.au/forums/topic/182158-rb20det-problems/
Share on other sites

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

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.

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.

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.

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!

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.

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.

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

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...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • 2 does "sort of" applies, maybe......but looking at what parts would be needed for the swap to get engineered, registered, and insured, and basically that's everything under the car, the modifications the make it legal would be problematic and horrendously expensive, all for a street car that just cruises around and hits a few twisty roads on the weekends Also, from looking at the NSW rules and Regs, with all modifications that is required just to make the car safe and not twist itself to pieces, and then actually get registered for street use, may still be impossible nowadays As for 1, when you add in a fresh engine, fresh transmission, rear cradle and diff, tailshaft, suspension, brakes, cooling, and all the other fabrication required, your probably looking at up to $100k to do it right, all for a 20 year old MX5 that is over engineered and you would never be able to actually use the power it has on the street, much like your beastie, which I love, but you actually track that thing and can use all of its powers in anger, in a safe environment  Hell, the old Bogan Cruise Ship had more power than I could use on the street, and in hindsight, I went a bit silly on that thing, it didn't really need the 500hp it had for what I actually used the car for, it was fun, but basically unusable on the street if you value your licence  As for cams, yeah, I'll probably book it in for them to get installed and tuned soonish, like next month after MX5 Mania are back at work....... and yes, I've already sent a email to bin the turbo quote and quote instead to install cams and a new Fluidampr balancer that will suit the 2.5 better than the OEM 2.0 balancer that is swapped over for the 2.5 install, as the balancer needs to get pulled to time the cams it's a while your in there sort of thing I did think a bit about flex fuel for a laugh, but being na, and no where really around locally anymore to get E85, I've binned that idea, so no sweet sweet corn smells are set for the car I wish E85 was more of a standard fuel, it's better for the environment, better for tuning, plus that sweet sweet smell we all love As for fitting in the family, that's not needed, as everyone in the family already owns a car that can seat 5 humans comfortably enough, the MX5 is "my toy" As for buying a car that is already built, nah, I would rather pick and choose my parts, I enjoy the process, and in the big picture, the additional cost is well worth the enjoyment, and the occasional frustration, I get out of doing it, albeit with other people spinning the spanners, and me, just paying the invoice 🤣
    • Excuse me, but 2) does apply 1) Would also apply if you consider how much is spent in the alternatives. Also there's the option of 3), buy one pre-built that you can put your family in (it's me, it's my car)   That said, I went on a ~500km drive the other day. I didn't use anything more adventurous than 3rd/4th gear at about ~3000RPM and 50% throttle and I was going as fast as anyone has any sense doing on a public road, with enough grip to the point where I didn't want to go any faster. I was obviously under the limit of the current car etc etc. MX5 with 2.5 N/A to achieve the same speed would be more fun for any road scenario. Maybe consider cams. I wouldn't boost it. The use case is just not there and it won't actually make the car more enjoyable unless you really do plan on wringing gears from 1st to 3rd (at least) at 100% WOT on a public road to 150+kmh.
    • Great if: 1. You had all of the money for everything else that is required  2. Lived in a country where you could actually do this and drive it legally on the road Sadly, neither applies to me As for the turbo, I am having second thoughts, mainly for engineering/registration legality reasons and insurance  Not saying I've finished doing stupid things that I probably should do to the MX5, but boost, and V8 engine swaps isn't on the cards Strange, but true 
    • I like this page, better than that silly turbo kit   https://v8roadsters.com/product-category/engine-conversions/engine-conversion-lsx/engine-conversion-lsx-nc/  
    • That would be my Shoei helmet
×
×
  • Create New...