car pulls hard till 4500, then nothing
I have a ihi rhb5. it was running 5psi. installed norgren mbc. car pulled hard to 10psi all night. next morning i shortend the vacuum lines to the mbc. Now the car pulls hard to about 4500 then no boost. or power. that was with full throttle. Made another pass and it cut out at 5psi. let off the throttle and then back on, it will boost again. but sometimes it will pull hard all thru first, shift to 2nd, nothing. no boost or power. Its different every pass.
setup- d15b vtec, 450's, crome. no codes. bad mbc? or wastegate not holding or whatever? ??? |
Re: car pulls hard till 4500, then nothing
sounds like the wastegate is getting flung wide open, see what happens when you turn the mbc down some.
internal wastegate? |
Re: car pulls hard till 4500, then nothing
yeah internal wastgate. The mbc I have says + and - . So I put it all the way to - and tried gradually advancing it. but it stills seems to be doing it. Its wierd because the night before i had the mbc 3/4 turn off - and it ran tits at 11psi.
|
Re: car pulls hard till 4500, then nothing
take the mbc off and if it is still acting wierd replace the wastegate or try to put a little oil in it.
|
Re: car pulls hard till 4500, then nothing
which rhb5 is it? is it the vj-11 off a probe? or a vj-14 off a 323? your 1.5L shouldn't over boost it at 4500rpms. but those are small ass turbo's. either one should be good to a solid 6000-6500 on a motor that small. i know guys that run them on the mazda 1.8L and it drops at about 5000-5500. but that is a bit more flow and displacement also.
NEUMAN |
Re: car pulls hard till 4500, then nothing
Could the shorter vac lines to the mbc cause more push on the wastegate causing it to open more like FooK said? Any possibility of running the old(longer) vac lines and see if it's back to "normal"
? |
Re: car pulls hard till 4500, then nothing
Originally Posted by Shreik
Could the shorter vac lines to the mbc cause more push on the wastegate causing it to open more like FooK said? Any possibility of running the old(longer) vac lines and see if it's back to "normal"
? NEUMAN |
Re: car pulls hard till 4500, then nothing
Originally Posted by neuspeedescort
line length is not going to play a factor here.
NEUMAN |
Re: car pulls hard till 4500, then nothing
I took the mbc off and just ran it at the stock 5psi. Runs fine like that, but still want to know why it was acting that way w/ the mbc on.
|
Re: car pulls hard till 4500, then nothing
Originally Posted by neuspeedescort
which rhb5 is it? is it the vj-11 off a probe? or a vj-14 off a 323? your 1.5L shouldn't over boost it at 4500rpms. but those are small ass turbo's. either one should be good to a solid 6000-6500 on a motor that small. i know guys that run them on the mazda 1.8L and it drops at about 5000-5500. but that is a bit more flow and displacement also.
NEUMAN |
All times are GMT -5. The time now is 08:15 PM. |
© 2024 MH Sub I, LLC dba Internet Brands