r32 gtst weird miss/surge in 4th or 5th

[CrazyMan]

hi all,

i just got an r32 gts-t and it seems to miss or surge a couple of times in 4th or 5th (when in boost) and then it'll be fine. This doesnt happen in 1st 2nd or 3rd. has anyone had the same problem?

specs are: (if it helps)

rb20det

15psi

hi-flowed turbo

standard bov

hks pod

[N I B]

Check or change plugs and gap them .8mm.

[CrazyMan]

k, i'll try that tommorow, and might do the ecu reset aswell.

Cheers

[TTT]

Has this happened only since the rebuild/hiflow of the turbo?

I ask because my friends RB20 with the standard turbo hilowed does the same thing.

As far as I've seen/heard, it is due to the turbo compressor and exhaust wheels being a mismatch.

EG. the front side of the turbo (compressor) can suck in heaps of air but the exhaust side is mismatched and is not able to expell all the air that is being pushed through it..

I'm sure that someone else can give a better explanation but that is roughly what his one is doing..

and it only happens whn on full boost higher in the revs..

I think it was BOOSTD on these forums who has played with machining the turbo to get rid of the surging..

search for threads by him..

good luck.