r31 rb25det cutting out at 60km/hr???

[Mcboost]

my mates just completed a rb25det conversion into his r31. the car doesnt have speedo wired in yet but it cuts out at around 60km/hr every time, goes dead, need to stop then turn car on again, anyone know what it may be?? wiring??

[paulr33]

limp home mode on the engine management? theres a rpm cut at 2500rpm when the ecu is stuck in limp home mode, could be a concidence that you reach 2500rpm to get this speed of 60km/hr. maybe do an ecu diag?

if you find it is the limp home mode thats causing it or you're feeling desperate and wanna try something get a friends (from another rb25det) afm and pod filter or airfilter and try that. Normally when the afm dies the engine stays in limp mode as it cant detect air flow properly

well at least thats what ive heard when diagnosing 'stuck in limp mode'

[paulr33]

"goes dead, need to stop then turn car on again"

that sounds exactly like its stuck in limp home mode

[predator]

AFM probably. Its not speedo related I don't *think* as I've driven around with the whole speedo cluster removed without problems.

[rsx84]

i had a similar problem with my conversion where the ecu had'nt been screwed back in properly, i think( if you hav'nt already) check that! or what i'm lead to believe is that limp mode kicks in when the ecu loses some sensors, not getting all the signals!

has the engine run normally sence being installed?