nicksamaniac

Yeah your right, i mounted it before and saw the outer faces of the pulley dont line up, so i thought it wasnt going to work. But have since bolted it on, and as you said it fits, the inside edges line up. i had to use a 4pk925 belt with a rib cut off, i couldn't get a 3pk/3 rib in the correct length and the 4pk940 it had on the rb20 was to big. But yeah its all fitted now, happy days, Cheers. I get to keep the hicas!

has anyone run the rb20det twin-pump (steer/hicas pump) on the rb25det? ive done search after search, and only found non hicas setups, which is an easy swap, or others have just deleted the hicas, and I don't want to delete it if I can avoid it. im in the middle of re-powering my r32 gtst with an r33 donor car, using the rb25det and fs5r30a box. im about to fabricate a new braket to mount it, but if anyone has a simple solution id like to know about it?

Whats a 20 worth to sell anyways? Given i dont think its worth the steam off my p!ss.

Im already getting quotes from a few places, trying to get a halfcut to upgrade the box as well. Possibly a neo with r33 gb combo i think would work well. ive completely lost faith in this engine, have even spoke to a few rb tuners, they agree to just upgrade it.

Also to mention, i monitored the map watch and afm voltage at cruise speed, On flat road, afm voltage and load points where solid and holding steady but afrs where rich off scale 10:1 to 13:1 back and forth while holding steady a load point. This led me to the short in the harness theory, but to no avail.

Running issues are intermittently happening still. So..... Changed out my fuel rail, reg and injectors from my rb30det (hardware i know works) along with the power fc, loaded an rb20det tune along with all the injector corrections to suit. Drove around all good, drove it work for night shift (27km trip) and it was perfect, afrs where imo spot on the money, drove really nice, crispy performance. Then drove home at around 2am, nice cool air about 22' and got about 2 min up the road, solid off scale rich, coughing and sputtering its so rich, all the way home. So i think, only hardware left is the harness, the rest i know works perfectly in my other car, so i strip the harness looking for a short in the injector signal wires (thinking they're being held open via a ground short circuit, rub through wire) And i found nothing but a surprisingly good cond harness. Fml! Separately wrapped up the inj signal wires, tapped the harness back up, no change obviously! So put all the stock hardware back in. Still rich af at idle, (it stalls/fouls plugs if left idling to long) Ran a new afm harness back to the ecu today, along with different afm. Ill test drive tomorrow. Thing has me stumped......

Haha yeah i know, i feel as though there could be injector flow issues, going to see if i can get them tested local to see if they're consistent flow.

So I think I may have fixed it? Between both sets of injectors, my old set from my 25de and the set out of it, ive found 3 dead injectors in total. So I measured them all for impedance, basket cleanliness, and set them up and ran them with the old cas spin method to trick the ecu into cycling them, 2 would do nothing and 1 would only work 50% of the time, and 2 of the 3 had high resistance, So I picked 6 that tested up and functioned ok. Put them in and it started and idled perfect straight away. Set the base idle and then base timing to 20', Took for a drive and feels like stock standard again, happy days! Afrs are not as tidy as id expect for a factory tune, but good enough to drive properly. They're atleast steady, close to what id target and not crazy rich/lean like it was.

Hopefully going in next week for a few hrs with dvs-jez, hopefully he can work it put. Im at a complete loss on what to do? Ive been right over it, methodically tested and inspected everything from scratch. No results thus far, still running like a 2bob watch. Spoke to a few tuners, decided a fresh set of eyes is next on the to do list. If I cant get this engine to run as it should, then im not going to waste any more time or money on it, seeing its nothing special anyways, (especially after driving my rb26 or 30det, the 20 is very average) ill drop either an rb25det in or neo 25det in it, then develop from there.

It has now got my old injectors from my rb25de (engine was the head donor for my 30det) still running the same? I seriously cant fault anything, ive even started again from scratch thinking i probably missed something. But have come up empty, i even dud all the process flow chart checks from the wshop manual. Im about to buy a 25 and harness to drop in and just replace this pos! Id read heaps of threads on 20 issues, and thought id never own 1 cos there obviously no good. But decided id give this one the benefit of doubt cos i liked the car. So here i am with 1 and it has issues! What do ya know!

Ok, update, tested every circuit from sensor or actuator bact to the ecu, all continuity checks are spot on excellent condition. Tested fuel pressure again while driving, all 100% correct. Pressure tested the whole inlet circuit to 25psi, only leak point was the pvc, so i disconnected it and am running crank case to atmo (for the purpose of fault finding) The pcv is now fully separate from the engine, check timing is set, tried 15' base and 20' base, proved no different while running. so it has zero intake leaks, Injector bases started to leak air Slightly at 30psi. All electrical is 100%, ecu code is 55 no malfunction. Fuel pressure is 100% in spec. Still idles at 10:1 off scale rich, afrs are all over the place while driving? Wtf its got me stumped?

Like this, done this on the first day of fault finding, thinking it was my problem to start with

Have spoken to previous owner (we keep in contact as he owns my old stagea!) He told me last big service it had, it got timing belt, plugs, splitfire coils (#5 had failed/was failing) Filters, oils, injectors serviced, Few other no engine related jobs. All this was backed up by me actually having a read of the recipts he gave me with it! Im really at a loss for ideas of what's left to check?

The iac valve has a new pipe, as i deleted the air regulator when i removed the rail to inspect the injectors, I tried blocking the pcv pipe but made no difference, i also made sure the valve is checking correctly and free moving.

I might try that?, don't think its my issue as it was running fine before. Its still the stock turbo inlet pipe, afm is still in the corner stock airbox position but ill try anyway.

What ended up being your issue xgtrx? Ive run out of things to check? Ive done every test that the workshop manual says, everything checks out as per the book, im out of ideas? Its running exactly like the injectors are only opening 50% of what they should, like its faulted at an exact value, not intermittent at all if that makes sense?

All the way to 8000rpm is 17:1 or higher, it will spike richer if stabbing the throttle but i assume thats due to acceleration enrichment. If i hold any rpm steady (while parked) its just lean.

Yeah checked timing is set at 15' base, and tried the cas from my patrol, no change.

So im at a loss on what wrong, time to ask? Bought an 89 r32 gtst m-type rb20det. Had it about 2 months now, and slowly been starting to run worse and worse. Was running well when I got it, been using it as a daily (my other cars are a 260rs stagea and a rb30det patrol) so was after a stockish type car, lower fuel use etc, but lately has been randomly playing silly buggers on me..... 1st time, got in it to go to work at 5am, started it up and only 3 or 4 cylinders running? Took my other car, that arvo I pull the plugs, completely sooted and fouled, put some new bcp6res set to 0.8mm, all good for a while, 2 days later starts missing and coughing, randomly not a solid fault so I assume ignition problem so I Swapped the ignitor for my other cars, problem goes away. Then a Week later, while on the highway it randomly starts missing again, but goes away? Happens every so often for a few kms, Then nothing for a few days, but develops this hectic hunting, like 200rpm up to 1600 back and forth, till it eventually stalls. So I begin fault finding, changed the fuel filter, no difference, decided to go all out, put my wideband o2 gauge in from my patrol, find its running 10:1 @ idle, so this is my hunting/stall/fouled plug issue, But! Anything over 2000 rpm its 17+ afrs. (Dont know how long its been doing this for?!?!) Light throttle it has no fuel, I dare not boost it! So then I think, ah ha! Fuel reg is stuffed, change the reg, install t piece to test pressure, All good, 43.5 at idle no vac, 36 with vac, take it for a drive and pressure rises with boost but still I have bad afrs? The hunting problem is fixed, Afrs are 14-15 at idle, but if I hold rpm at 1500, it drops to 18:1? So then I checked the fuel pump, thinking its not keeping up with rpm/load, Pulled it out, put my spare Walbro 255 in, gave it the 12v power mod to eliminate the dropping resistor. Drove again with the gauge to check pressure, still in spec. Sooo, then I think well it must be afm related? Its obviously reading the wrong load. So swap to a known working afm, same issue, I test the afm wiring back to ecu, found some high resistance on earths, fix it, tests up all good, but still the same issue with lean afrs! I removed the fuel rail, checked everything is clean, baskets are clean, put it back together, same issue. So then I put my pfc out of my patrol in, load a stock rb20 tune, start it up, everything is reading correctly...... But same issue! Here's whats been tested. -fuel pressure is 100% in spec. -pressure tested inlet/cooler pipes to 15psi. -tested for vac leaks on inlet with aerostart. -tested all earths, to ecu and sensors, -12v checked at injectors, afm, ignitor, ecu -no faults at ecu logged. -tested/swapped afm -tested/swapped cas -tested ecu wiring inputs and outputs - Mods list. -fmic -3" turboback exhaust -pod with enclosed box -rb25det turbo (45v3) -Walbro 255l intank, wiring mod done, Stock 10psi boost, gate only. Stock fuel system, injectors, rail, reg, (except pump) When I drove it with the pfc, I logged a run to see if I could find probles during playback Using fc datalogit but nothing out of place via what I saw, except the lean afrs. PLEASE HELP ME! Im out of ideas, and getting general unhappy with it!

Ive looked all over the site, there is no phone numbers i can find, even the suppliers are email only.

Zebra thats normally what i do too! i have emailed them yes, but have not heard back. then a few days later (today) i asked some people whom i thought may very well be in the know? I even google the question before asking here to see if it has been asked, but found no real answer. thanks tje i spose I'll just wait a while longer to see what happens.

I've ordered a FC-Datalogit kit/package, about 2 weeks ago. Directly from nz, just wondering if anyone has ordered from them and how long it took to arrive in aus? Cheers. Also i did a search, but found nothing and of all the sections on this site, forced induction seems to have little to zero dumb answers. Its usually straight up answer's-so thanks in advance.

In regards to the FC-Datalogit, those who have bought brand new kits, from NZ, how long did it take to arrive? Thanks in advance.

Has anyone tried 2 afm on 1 circuit? If 1 measures 2500mv,(random value) then 2 in series should measure 1250mv each? Would this be the general consensus? Then adjust the afm percentage up to 200% so the ecu still see's its correct intake of air volume.