car pulls hard till 4500, then nothing
03-26-2006, 12:41 AM
#1
1.5 BAR
Thread Starter
Join Date: Jan 2006
Posts: 865
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?
setup- d15b vtec, 450's, crome. no codes. bad mbc? or wastegate not holding or whatever?
03-26-2006, 02:52 AM
#3
1.5 BAR
Thread Starter
Join Date: Jan 2006
Posts: 865
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 **** at 11psi.
03-26-2006, 02:27 PM
#5
1.0 BAR
Join Date: Dec 2002
Posts: 640
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 *** 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
NEUMAN
03-27-2006, 01:07 AM
#6
1.0 BAR
Join Date: Mar 2006
Posts: 295
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 **** said? Any possibility of running the old(longer) vac lines and see if it's back to "normal"
?
?
03-27-2006, 02:09 AM
#7
1.0 BAR
Join Date: Dec 2002
Posts: 640
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 **** said? Any possibility of running the old(longer) vac lines and see if it's back to "normal"
?
?
NEUMAN
03-27-2006, 11:48 AM
#10
1.5 BAR
Thread Starter
Join Date: Jan 2006
Posts: 865
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 *** 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
NEUMAN
