reeceo21 Posted August 18, 2012 Share Posted August 18, 2012 Hey everybody just completed my rb25 box conversion in my rb25ed 32 4 door. Now my problem is at 5500rpm in fifth it feels like i hit a wall. It will not go any where past 5500, And im pretty sure its only WOT that it does it. Someone suggested speed limiter. Sounds logical BUT i dont have the cable hooked up ? The reason it doesnt make sense is it will bounce the limiter in the third but 4th hits the wall at around 7000 and 5th hits at 5500. I dont think its fuel as it has a good bosh 040 pump and here it whizzing and all other gears are fine. Now this problem has only just happened after the box. Therefore thats why im thinking maybe some sort of limiter is in place because of it. Related mods that may help find the problem are as follows -FMIC -Plugs were changed about 1000k ago -Nistuned r32 ecu -Bosch 040 -Apexi pod in a box -3' straight through exhaust -34 turbo at around 10 psi Someone suggested just give the yellow wire the snip (53) and try but would prefer to know if anyone has ever had any experiences like this. Link to comment https://www.sau.com.au/forums/topic/407302-cut-out-at-5500-rpm-in-5th-and-about-7000-in-4th-no-speed-sensor/ Share on other sites More sharing options...
DVS JEZ Posted August 19, 2012 Share Posted August 19, 2012 Need more power to break the sound barrier at 5th gear 5500rpm. Its not a veyron dude. Get it on a dyno to see if it does have an issue Link to comment https://www.sau.com.au/forums/topic/407302-cut-out-at-5500-rpm-in-5th-and-about-7000-in-4th-no-speed-sensor/#findComment-6493812 Share on other sites More sharing options...
Hadouken Posted August 19, 2012 Share Posted August 19, 2012 Need more power to break the sound barrier at 5th gear 5500rpm. Its not a veyron dude. Get it on a dyno to see if it does have an issue Haha Does it happen around 180km/h? Link to comment https://www.sau.com.au/forums/topic/407302-cut-out-at-5500-rpm-in-5th-and-about-7000-in-4th-no-speed-sensor/#findComment-6493818 Share on other sites More sharing options...
R31Nismoid Posted August 19, 2012 Share Posted August 19, 2012 Need more power to break the sound barrier at 5th gear 5500rpm. Its not a veyron dude. Exactly. Link to comment https://www.sau.com.au/forums/topic/407302-cut-out-at-5500-rpm-in-5th-and-about-7000-in-4th-no-speed-sensor/#findComment-6493837 Share on other sites More sharing options...
reeceo21 Posted August 19, 2012 Author Share Posted August 19, 2012 Cant tell man it has no speed sensor haha . Quite possibly could be near it but how would the computer know if the speedo cable is disconnected ? Link to comment https://www.sau.com.au/forums/topic/407302-cut-out-at-5500-rpm-in-5th-and-about-7000-in-4th-no-speed-sensor/#findComment-6493876 Share on other sites More sharing options...
Moodles2 Posted August 19, 2012 Share Posted August 19, 2012 ECU shares speed info from the ABS system, the speed sensors on each corner Link to comment https://www.sau.com.au/forums/topic/407302-cut-out-at-5500-rpm-in-5th-and-about-7000-in-4th-no-speed-sensor/#findComment-6493993 Share on other sites More sharing options...
mad082 Posted August 19, 2012 Share Posted August 19, 2012 it could just be the speed cut, but i'd have thought that 5500rpm in 5th is above 180kmh. i'd say that you are just not making enough power to overcome the drag. you'll need a lot more power to get to redline in 5th gear. when i still had access to the runway at the local airport my r33 topped out at about 6500rpm. but if you are getting a lower rev limit in 4th as well, then it's speed cut. my old 180sx hit the speed cut on the dyno at 7000rpm (500rpm below the rev limit) Link to comment https://www.sau.com.au/forums/topic/407302-cut-out-at-5500-rpm-in-5th-and-about-7000-in-4th-no-speed-sensor/#findComment-6494233 Share on other sites More sharing options...
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