Installed Rb25Det Into R32 And Not Running Right

[dreadr31]

ok iv put a stock 25det into a r32 when driveing around works mint revs up does what a 25det does,

but when drifting usen hard revs it misfire cuts power drops revs to 6000rpm

any body know the proplem dosent feel like a coil or afm proplem feels like a fuel cut

i have no speedo hooked up some one told me it could be the proplem going into a over rev fault code

has any one got experience with this its the 2nd 25 to 32 that has done this both with no speedo's fix the last one with a tune

any help will be appreciated

[GTSBoy]

OK. We don't need to know what ECU you're running, how much boost, or any of that sort of nonsense.

I think the cause of the problem is the stale fish heads in the boot. Get rid of them and it will all be better.

[dreadr31]

i do say stock 25det, air box ,s1 ecu, 7psi, only mod is fmic and gtr fuel pump

[GTSBoy]

Stock motor can still run 14 psi and different ECU.

Seems like you know what the problem is.

[Stock e-Tune]

stock ecu is programmed with a safety limit of 6000 when the speed input signal is 0.

[dreadr31]

yer then people are saying to cut pin 53 to disable speed limiter and have no proplems

or is at because i thrash the crap out it then cuts because it dosent know whats going on

[dreadr31]

http://www.skylinesaustralia.com/forums/topic/346144-r32-speed-limiter/

hmm after looking at this link it seems my car might be a in neutral map with no speed senser so it could be cutting out

[ZRBE]

Thinking of doing this.. Looks and sounds so much more complicated than I initially thought though

[paulr33]

ive checked the rb25 diagnostics book and there is no mention of RPM failsafe mode of 6000rpm when speed sensor is not connected

[dreadr31]

iv still got to hook up a consult port and i brought a greddy intelligent infometer i hope this could help me find the proplem

at the moment my plan of attack is to loop the neutral switch put in a 25 speed senser run the output to the ecu

i dont want to get a tune because motor is getting pulled out in afew weeks to make room for a 250rwkw sr20det

[GTSBoy]

You cannot run the speed sensor direct to the ECU. The speed sensor outputs an AC signal at +/-1V or thereabouts. The speedo head converts that to a 0-5V square wave signal, which is what the ECU is looking for.

The very simple solution, as it always has been, it to fit a bloody speedo.

[dreadr31]

arrr broken the cable but

[GTSBoy]

No. Don't piss about. Just get an R33 speedo out of a wreck, wire it to the box and the ECU, tuck it up under the dash and be happy.

As for Paul, the R34 ECU definitely has a bunch of zero speed protections built in. Looking at the stock manual bin file in Nistune, max RPM with zero speed is 4500. Map TP with zero speed is 96. It is fair to bet that Nissan had similar protections in the R33 ECU too, it's just that we can't go look inside so easily.

[dreadr31]

ow dash speedo dam i just sent the shell to scrap hmmmm might have 1 around

Edited June 4, 2013 by dreadr31

[dreadr31]

if i put a new cable in will it fix it

why when people run a 25 in to a 32 with no speedo have no proplems or cut speed pin 53 and have no proplems

[GTSBoy]

I don't think they do have no problems. I think they run into the exact problem you have. If you use a PowerFC or other ECU then no problem.

With respect to cutting pin 53......there may be a difference between having no signal there at all (not even the circuit connected) and having it connected but not pulsing. The ECU may be able to tell the difference. I don't know with R33 ECUs particularly, because they are useless in all regards I've never been in a car that has one!

If you want to use a cable drive speedo with R33 box in R32 you're going to need to use the Navara drive mod to make it work. I did it to mine, it's not hard, although the speedo cable ends up with a nasty short radius curve in it down near the box/chassis rail afterwards.

Edited June 4, 2013 by GTSBoy