Revs Droping

[Cyo18r]

I have a r32 4door gtst (rb20det) and some times you give it a boot full then go to pull up and the rpm drops off some times to the point were it stalls or you could be drive along and go to change gears and it's like the car stalls out and also it dose it why just putting around anyone got any iders that could help me out even if you could SMS me as I don't really get on here much (0401 787 770)

[drftking]

will second this mine also does it

post info in this thread to thanks

[89CAL]

atmo bov?

[theforce]

try performing a fault/error code test using the OBD and see what error code flashes on dash. If your afm, ignitor, coils, plugs are ok, then it could be a faulty CAS (crank angle sensor).

[Muff]

i had the same prob. i cleaned the aac valve. and throttle body and afm. fixed my prob.

[mad082]

sometimes it can be the AAC, other times it can be weak coils or old plugs, or it can be an atmo bov (or blocked off bov/no bov).

[Cyo18r]

Thanks for the help guys if u got any other iders let me no.... I have new plugs and new splitfire coil packs siting there witch I am puting in in the weeknd coz the standed coils are crap when I was runing 18psi that didn't like it and are just still kinda working lol

[Muff]

the high boost is blowing the spark Out. i used 2 have this problem so i went 2 a smaller gap plug and coil plugs. but it used 2 only happen under boost.

[89CAL]

Have you got an BOV venting to atmosphere? This could be causing the issue if the car is not tuned/tuned correctly.

Also new spark plugs and coilpacks are a good idea, however they are not going to solve your problem of revs dropping and stalling as these are at low load points where you dont require a strong spark. I dont think that will be the issue but its something worth updating anyway.

Clean the AFM and AAC valves and post up if you have an Atmo BOV and if so which one.

Also if you DONT have an atmo bov, and the car has a factory ECU (with no chip, piggyback etc) then perhaps try resetting the ECU. I had my skyline go funny back when it was on stock ECU after I put an atmo BOV on it then took it back off. It did the same thing kept stalling even with the stock BOV back on, and I tried everything and the only thing that fixed it was resetting the ECU

If you want to do that, disconnect the battery and hold your foot on the brakes for about 10 seconds or so then plug the battery back in. But do this only if your sure its the factory ECU with no mods/chips/tunes/piggybacks etc

Edited January 7, 2011 by 89CAL

[Cyo18r]

It is runing the factory ecu but it's been chiped far as I no coz it dose not have speed cut and revs out more and it has a hks ssqv type1 bov.... I will list the mods done to the car witch most of them was already done to the car when I got it

(rb20det)

hks ssqv

hks front mount

turbosmart boost T

hks pod filter

2.5" twin champer dump pipe

3" exhuast

r33 turbo that has been high flowed and has a garrat gt35

ballbearing

Other then that it's standed

it made 232hp on 10psi soon to be going on the dyno after I do me new plugs and coilpacks and biger fuel pump

Other then that it's sta

[mad082]

the bov is going to be a large part of the problem. probably not the whole problem, but a large part of it.

[89CAL]

mine didnt have speed cut and seemed to rev more, but trust me it was definently a stock ECU. Yours is running a high flow but making 173rwkw, which suggests its probably still a standard ECU but I'm not going to say it definently is or definently isnt.

If you can, start the car and when its hunting or trying to stall try placing something over the BOV so no air can escape from it. If this makes your revs settle down then I'd say the BOV will be the issue. HKS make plumback kits for the SSQV's (not sure for which generation they apply to but)

[fly333]

Hi im am having the same problem when i accelerate to red line then take my foot off the accelerator the car drops and the whole engine shakes.

I have stock ecu,turbo,fmic,turbo exhaust.

i took my car to be diagnosed today but couldn't find the problem. The fuel pump,air flow meter,cas, has been checked and still having same problem..........

I'm sick of wasting time and money can anyone help.

Edited February 17, 2011 by fly333

[fly333]

BTW forgot to mention that the coil pack and spark plugs were also checked and changed. Do you think a standard bov will have something to do with it?

Edited February 17, 2011 by fly333

[nm35is]

Revs dropping to the point of stalling...I had the same issue with my r32 gtst. Did a diagnostic with my connect cable n ecutalk software. Turned out to be a code 12 (maf sensor) fault. Cleaned out the afm (sensor & the plug, undid 4 screws n pulled the plug out, sprayed inside with carby/tb cleaner) and it fixed my issue. The contact points inside the plug were bogged up...

[fly333]

Cheers I'll give it a go.

[Dan_J]

sometimes it can be the AAC, other times it can be weak coils or old plugs, or it can be an atmo bov (or blocked off bov/no bov).

can someone explain why a rb with no bov will stall more?

[djvoodoo]

can someone explain why a rb with no bov will stall more?

Has been covered a million times, air flow is pushed back through the IC pipework (no bov to release pressure), hits the AFM on it's way out of the pod... AFM read's twice the amount of air, chucks in more fuel, stallage.

Doesn't happen to all rb's. there are many people on this forum that don't run bov's and don't have stalling issues.