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Rb30Det Strange Things Happening When Tuning

DYNOBUSTER

By DYNOBUSTER,
in Engines & Forced Induction

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DYNOBUSTER Enthusiast

DYNOBUSTER

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Posted

so the specs are as follows

RB25/30det RB30E NA pistons and ACL race bearings

cometic MLS head gasket

R33 25 DET head with VCT delete

stock cams

gt35r .82a/r

500cc injectors(at the start then 700)

Nisstune board

Z32 AFM

R33 S2 coilpacks

Chinese verrry hiii quarity special exhaust manifold the stainless tubular one and a 38mm wastegate

one of those greddy style intake plenums

hybrid cooler

3 inch exhaust no cat and a straight through muffler... and yes I looked inside it to see if its fallen to bits

basically the problems are as follows

when the thing is on the dyno the AFR and power is all over the place but trending lean this is at around 330rwkw boost steady as

so I'm like hmmm more timing and less timing and a bit more fuel and a bit less fuel you know what I'm on about..nothings helping

no misfires but we chuck some new spark plugs in nope not that... thinking its injectors now...not the size I've been told

so I'm like MEH lets make the injectors go static at 4000rpm so she goes revvvvvvvvvvvchokefarttttttttttttttttttbammmmmmmmm 390rwkw so the combo is working just takes a dyno queen tune to get it

so I say whip the injectors... got a set of 700cc bosch ones and a SARD reg lying around chucked them on scaled the maps still the same problem WTF but with more power 350RWKW

now I don't know whats going on so we look at more fundamental things is the cam belt in the right place...yep whats the pressure and pump return flow... steady pressure and never less than 2lt min return to tank...hmm

anyone got any ideas....i think the greddy style Chinese manifold is somehow holding up the fuel in it don't know it's a pretty rough looking item on the outside would think worse inside...

the guy who owns it was happy as a pig in shit when he took it away so not really a problem just I would like to know whats going on because I have a RB30DET in my car and it tuned like a dream with 550cc injectors made 350rwkw and fast as hell in a Cefiro the only difference was mine has a plenum I made from some aluminum pipe a stock head flange and put some webber trumpets inside and a NEO head and the VCT works (VCT is worth it I think) and a haltech

any ideas??? I'm pointing at the shite plenum...anyone had this problem before????

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