turbo-busa-rabbit
Registered
hey guys, havn't posted for a while. lifes been busy with other things for a while.
bicycles, ice racing cars, maintaining boring daily drivers etc..
i have three busas here at the shop. one fully stock. my own home build 8psi turbo.
and one im building for someone else, for higher boost.
the higher boost one is the problem i need help with.
i had this thing running great back in the summer. at 240 bhp rear wheel.
we then decided to run it on C12 and up the boost a bit,
it has aftermarket rods and pistons.
so i boosted it upto 340 bhp. playing with different injectors etc..
then while doing a lot of dynoing. the clutch started slipping. BADLY
so it was taken off and had a billet basket, APE spring kit, and support bracket and new suzuki clutch disks.
i also removed the power commander V pti. and put stock injectors back on, and did some machining/welding. so theres now 4 S2000 injectors in the plenum.
these secondary injectors are to be powered by a controller by a company called SDS.
annddd.... changed to a slightly larger, and Ball bearing turbo.
so.... its finally back on the dyno now. and before i start adding boost i just tried a couple of runs with the boost pipe off. 43 psi fuel pressure. stock ecu. stock injectors.
i got crappy stuttering and SLOW....... 49 bhp !
finally found one injector wasnt working. replaced that and cleaned them all.
back to the dyno - - - - - 102 bhp !
this is repeatable.... every time. 101 - 102 bhp.
it seems rich at idle. for it all being stock fuelling.
i have 12-12.7 on the ARF gauge. the whole time. from idling at 12 to 12.7/12.5 through the run.
i really want to fix this and see 145 bhp roughly before i start boosting things.
-i recalibrated the throttle position sensor.
does anyone have testing spec for air box sensor ?
and coolant temp sensor ?
could those be it ?
-i have checked and confirmed Cam timing is still perfect.
-a have watched the fuel pressure gauge during a run. and its maintained and fine.
-i have checked and cleaned out the fuel filter.
- SDS system and extra injectors are all currently switched off.
- in dealer mode i have no codes. and the TPS sensor line is central.
- i replaced last summers C12 with fresh 91 gas.
- the cam sensor is clean and the pin in the cam has not moved or fallen off haha
it starts up perfect,idles, revs and sounds great IMO
even sounds good during a run to be honest. just 102 bhp not 150bhp
what do you think i should check next ?
should i try a spare ECU ?
THANK YOU in advance hayabusa wizards !!!!!
bicycles, ice racing cars, maintaining boring daily drivers etc..
i have three busas here at the shop. one fully stock. my own home build 8psi turbo.
and one im building for someone else, for higher boost.
the higher boost one is the problem i need help with.
i had this thing running great back in the summer. at 240 bhp rear wheel.
we then decided to run it on C12 and up the boost a bit,
it has aftermarket rods and pistons.
so i boosted it upto 340 bhp. playing with different injectors etc..
then while doing a lot of dynoing. the clutch started slipping. BADLY
so it was taken off and had a billet basket, APE spring kit, and support bracket and new suzuki clutch disks.
i also removed the power commander V pti. and put stock injectors back on, and did some machining/welding. so theres now 4 S2000 injectors in the plenum.
these secondary injectors are to be powered by a controller by a company called SDS.
annddd.... changed to a slightly larger, and Ball bearing turbo.
so.... its finally back on the dyno now. and before i start adding boost i just tried a couple of runs with the boost pipe off. 43 psi fuel pressure. stock ecu. stock injectors.
i got crappy stuttering and SLOW....... 49 bhp !
finally found one injector wasnt working. replaced that and cleaned them all.
back to the dyno - - - - - 102 bhp !
this is repeatable.... every time. 101 - 102 bhp.
it seems rich at idle. for it all being stock fuelling.
i have 12-12.7 on the ARF gauge. the whole time. from idling at 12 to 12.7/12.5 through the run.
i really want to fix this and see 145 bhp roughly before i start boosting things.
-i recalibrated the throttle position sensor.
does anyone have testing spec for air box sensor ?
and coolant temp sensor ?
could those be it ?
-i have checked and confirmed Cam timing is still perfect.
-a have watched the fuel pressure gauge during a run. and its maintained and fine.
-i have checked and cleaned out the fuel filter.
- SDS system and extra injectors are all currently switched off.
- in dealer mode i have no codes. and the TPS sensor line is central.
- i replaced last summers C12 with fresh 91 gas.
- the cam sensor is clean and the pin in the cam has not moved or fallen off haha
it starts up perfect,idles, revs and sounds great IMO
even sounds good during a run to be honest. just 102 bhp not 150bhp
what do you think i should check next ?
should i try a spare ECU ?
THANK YOU in advance hayabusa wizards !!!!!