32psi and knocking?
Thread Starter
Senior Member
Joined: Mar 2001
Posts: 287
Likes: 0
From: aloha,OR.Usa
32psi and knocking?
I was out checking injector duty cycle running 32 psi boost with everything going ok until I got home. The motor was rattling like a piston rod knock. I checked compression on all rotor lobes and all OK.
The oil pressure is perfect to with nothing showing abnormal on dipstick.
I havenyt torn down yet but wondered if anybody has any ideas on what the knock could be, its l;oud to. The car starts and runs fine.
Ralph
GroundZero Motorsports
The oil pressure is perfect to with nothing showing abnormal on dipstick.
I havenyt torn down yet but wondered if anybody has any ideas on what the knock could be, its l;oud to. The car starts and runs fine.
Ralph
GroundZero Motorsports
Banned. I got OWNED!!!
Joined: Jul 2002
Posts: 930
Likes: 1
From: Oregon
Ralph,
Does it sound like a helicopter and is it coming from the rear rotor? If so, it may be similar to the issue I had on my 13bt. I also had a bent input shaft on my tranny that needed to be rebuilt. Cross your fingers and hope its nothing serious! I would ask Rob about it, he's suppose to open my old motor up and see what the issue was with mine.
Jim
Does it sound like a helicopter and is it coming from the rear rotor? If so, it may be similar to the issue I had on my 13bt. I also had a bent input shaft on my tranny that needed to be rebuilt. Cross your fingers and hope its nothing serious! I would ask Rob about it, he's suppose to open my old motor up and see what the issue was with mine.
Jim
1JZ powered
Joined: Jul 2001
Posts: 4,423
Likes: 0
From: Where there's only two seasons, hot and wet! I love Okinawa
my motor did the same thing! Took it apart and the front bearing was TOAST. I changed the oil and nothing inside, but as soon as I removed the oil pan...WOW...fairy dust everywhere. When I took off the front cover, there were metal shavings EVERYWHERE. I had a bent e-shaft...
I was thinking about this last night and this morning. (Takes awhile for the ol' gears to start turning sometimes. 
) I've only seen it a couple times, but every once in awhile a tention bolt backs out, and starts hitting the flywheel, causing quite a bit of racket. Jim or jspec could be right though....I was just thinking of what else could have happend. CJ
) I've only seen it a couple times, but every once in awhile a tention bolt backs out, and starts hitting the flywheel, causing quite a bit of racket. Jim or jspec could be right though....I was just thinking of what else could have happend. CJ
Thread Starter
Senior Member
Joined: Mar 2001
Posts: 287
Likes: 0
From: aloha,OR.Usa
Im running a T72Qtrim with 4" exhaust. Thanks for the imput everybody
I'm going to yank it out and make it more reliable if possible. I think its bearings because I run it at 9000RPM also but I never had any trouble in the last year until I put on 4"exhaust and it went from max 1.9bar to
2.2bar. The performance difference was incredible so was the load on the motor, Hi CJ Ralph
I'm going to yank it out and make it more reliable if possible. I think its bearings because I run it at 9000RPM also but I never had any trouble in the last year until I put on 4"exhaust and it went from max 1.9bar to
2.2bar. The performance difference was incredible so was the load on the motor, Hi CJ Ralph
flying apex seal
Joined: Jul 2003
Posts: 747
Likes: 0
From: Cyprus
That's some serious air flow you've got there dude. If it was detonation then i doubt if you would left with any unbrocken seal.
Can you post some numbers with that turbo? A dyno graph would help as well
Can you post some numbers with that turbo? A dyno graph would help as well
Trending Topics
Thread Starter
Senior Member
Joined: Mar 2001
Posts: 287
Likes: 0
From: aloha,OR.Usa
Blue TII ill give them a call and check them out, Good info! Thats the kind of parts I am looking for. The only dyno graph I have is 560 RWHP
@24 Psi and 3" exhaust, thats the max I got without slipping on 315 30 Pzeros. The rest was tuned with a wideband and datalogging on the street, buthe extra boost and 4" exhaust is making it real hard.
So here come the slicks when new motor done. Thesr RX7s rock.
Ralph
@24 Psi and 3" exhaust, thats the max I got without slipping on 315 30 Pzeros. The rest was tuned with a wideband and datalogging on the street, buthe extra boost and 4" exhaust is making it real hard.
So here come the slicks when new motor done. Thesr RX7s rock.
Ralph
Thread Starter
Senior Member
Joined: Mar 2001
Posts: 287
Likes: 0
From: aloha,OR.Usa
Nice kits. Thx for the info. I ordered a GT42 74mm ball bearing turbo
a couple weeks ago for my friends car and am going to test it out before I change my setup. His car is almost a carbon copy so he gets to be the ginny pig. Ralph
a couple weeks ago for my friends car and am going to test it out before I change my setup. His car is almost a carbon copy so he gets to be the ginny pig. Ralph
Banned. I got OWNED!!!
Joined: Jun 2003
Posts: 1,619
Likes: 0
From: Central Florida
hey, what generation car are you running and what injectors are you running to beable to push 32psi... I have a full race prepped motor with race seals and everything but I didnt know you could push that type of boost on these cars.
Wow...........!
<--- Damn near everyone else on the road
Rotary Enthusiast
Joined: Oct 2001
Posts: 1,020
Likes: 0
From: Canada
Ralph knows how to tune the big turbos! No sense having a big T-72 and not push it. I am amazed that You can have enough fuel for 30 PSI with 850/1600 injectors to run that high of boost though.
Couple of questions: What AFR do You run at that high of boost? What fuel pump are You using to feed that monster?
I ran out of fuel at 24 PSI with My T-72 and was @ 98% injector duty?
Couple of questions: What AFR do You run at that high of boost? What fuel pump are You using to feed that monster?
I ran out of fuel at 24 PSI with My T-72 and was @ 98% injector duty?