*sigh* First problem I cant figure out (transmission?)
08-30-05, 04:38 PM
#1
Rotary Enthusiast
Thread Starter
*sigh* First problem I cant figure out (transmission?)
Hello all,
First thanks very much for taking the time to read this, it could prove to be a tricky problem and any help is greatly appreciated.
I'll start off first with a list of mods on my FD mileage etc.
96k miles on original motor and trans Motor is as strong as its ever been, i'm very impressed by how well its holding up.
mods are
Intake,dp,mp,cb, powerfc @12psi FMIC radiator no P/S no A/C profect spec II boost controller, Street/strip clutch, 9.5lb flywheel poor mans non sequential and some other stuff that I dont think is related to this problem.
When I replaced the clutch and flywheel, I made sure to torque the flywheel on properly, I replaced the pilot bearing, clutch fork and throwout bearing. I also installed an SS clutch line. My PPF looked flawless, no cracks in any of the welds or highest areas of stress and I replaced the transmission fluid when I replaced the clutch just a year ago last week. Anything I remember later in relation to the drivetrain i'll post.
Now to the problem.
I had a boost issue for almost a year that after much work ( should have checked this first) it turned out that my spec II had shorted out and wasnt working anymore. So after fixing my boost issue and getting my 12-13psi back I was more then happy to return to the wonderful land lacking problems. I was doing a few pulls and my car from the beginning of achieving proper boost felt strong as hell in second, but felt a little bit flatter in third and 4th. For some reason my boost was being cut off a bit by my boost controller, but now I think it was somthing else. Fast forward two weeks after fixing my problem.
I'm on the highway and I do a pull from 2nd on. Upon shifting into third gear clutch fully engaged ( foot off the pedal) and going WOT again, the motor with rev up like the clutch was fully disengaged (No not slipping, it revved like it was in neutral). I checked to make sure it was fully in gear, and it was, and proceded to do a 2nd to third gear pull again with the EXACT same results. Now if I just cruise around, my third gear acts just like usual, no problems at all.Now I know the clutch isnt slipping, because I can go WOT in 4th and expect it to slip, but it does not. However, that same night, doing a straight 4th gear pull results in somthing that mimics or is fuel cut at the EXACT same RPM's each time, around 6k. I have no idea whats going on in relation to that. Thatnight I kept it easy after that, and the car seemed to vibrate much more in third and higher gears.
Now bear with me, this is pretty hard to explain. Fast forward 2 more weeks. Now, the car is perfectly fine when I cruise around with it, but the second I start to be slightly aggressive in my driving ( moderate boost 2-3~psi) and going through the gears slightly faster it starts to vibrate and feel very nerve racking. If I go wot in any gear, it hits boost properly, and at the correct RPM but just feels so flat and dead on its face. I cant figure out whats going on, but i'm leading to believe my transmission's health has taken a turn for the worst? Perhaps my Rear main seal is leaking oil onto the clutch surface and its effecting shifting... but then i'd expect it to slip.. I dont know =\
At this point i'm looking for any ideas or things to check or suggestions to do.
thank you very much for taking the the time to read my problem.
First thanks very much for taking the time to read this, it could prove to be a tricky problem and any help is greatly appreciated.
I'll start off first with a list of mods on my FD mileage etc.
96k miles on original motor and trans Motor is as strong as its ever been, i'm very impressed by how well its holding up.
mods are
Intake,dp,mp,cb, powerfc @12psi FMIC radiator no P/S no A/C profect spec II boost controller, Street/strip clutch, 9.5lb flywheel poor mans non sequential and some other stuff that I dont think is related to this problem.
When I replaced the clutch and flywheel, I made sure to torque the flywheel on properly, I replaced the pilot bearing, clutch fork and throwout bearing. I also installed an SS clutch line. My PPF looked flawless, no cracks in any of the welds or highest areas of stress and I replaced the transmission fluid when I replaced the clutch just a year ago last week. Anything I remember later in relation to the drivetrain i'll post.
Now to the problem.
I had a boost issue for almost a year that after much work ( should have checked this first) it turned out that my spec II had shorted out and wasnt working anymore. So after fixing my boost issue and getting my 12-13psi back I was more then happy to return to the wonderful land lacking problems. I was doing a few pulls and my car from the beginning of achieving proper boost felt strong as hell in second, but felt a little bit flatter in third and 4th. For some reason my boost was being cut off a bit by my boost controller, but now I think it was somthing else. Fast forward two weeks after fixing my problem.
I'm on the highway and I do a pull from 2nd on. Upon shifting into third gear clutch fully engaged ( foot off the pedal) and going WOT again, the motor with rev up like the clutch was fully disengaged (No not slipping, it revved like it was in neutral). I checked to make sure it was fully in gear, and it was, and proceded to do a 2nd to third gear pull again with the EXACT same results. Now if I just cruise around, my third gear acts just like usual, no problems at all.Now I know the clutch isnt slipping, because I can go WOT in 4th and expect it to slip, but it does not. However, that same night, doing a straight 4th gear pull results in somthing that mimics or is fuel cut at the EXACT same RPM's each time, around 6k. I have no idea whats going on in relation to that. Thatnight I kept it easy after that, and the car seemed to vibrate much more in third and higher gears.
Now bear with me, this is pretty hard to explain. Fast forward 2 more weeks. Now, the car is perfectly fine when I cruise around with it, but the second I start to be slightly aggressive in my driving ( moderate boost 2-3~psi) and going through the gears slightly faster it starts to vibrate and feel very nerve racking. If I go wot in any gear, it hits boost properly, and at the correct RPM but just feels so flat and dead on its face. I cant figure out whats going on, but i'm leading to believe my transmission's health has taken a turn for the worst? Perhaps my Rear main seal is leaking oil onto the clutch surface and its effecting shifting... but then i'd expect it to slip.. I dont know =\
At this point i'm looking for any ideas or things to check or suggestions to do.
thank you very much for taking the the time to read my problem.
Last edited by Rx-7$4$me; 08-30-05 at 04:41 PM.
08-30-05, 05:02 PM
#3
Rotary Enthusiast
Thread Starter
I'm confused when you ask how long do I let it slip for. When I throw it into third, I completely let my foot off the clutch and go WOT again. It immediately revs up so fast that it bounces off the rev limiter which makes me believe it is not a slipping clutch. If the clutch was in that poor of a condition it would be slipping all over the place.
There is no smoke that I have visibly seen,smelled, nor have any of my friends around the car when I tested this reported.
Thank you for taking the time to reply!
There is no smoke that I have visibly seen,smelled, nor have any of my friends around the car when I tested this reported.
Thank you for taking the time to reply!
08-30-05, 05:34 PM
#5
Rotary Enthusiast
Thread Starter
Originally Posted by BlueTII
When you installed the flywheel, did you make sure that the key seated in the counterweight properly?
08-30-05, 07:36 PM
#6
As far as the 6k problems, make sure that your rev limiter on your PFC didn't get changed. Have you changed the plugs & wires recently? That probably wouldn't cause what you are describing, but at least you can rule that out. You may have another ignition/coil issue.
When it was running right, is third gear the only one that gave you a problem? You may have an internal problem with your trans...but that would be odd and very unlikely. If you drive normal in third it does fine, right? But then once you got WOT it acts like there is no load?
When it was running right, is third gear the only one that gave you a problem? You may have an internal problem with your trans...but that would be odd and very unlikely. If you drive normal in third it does fine, right? But then once you got WOT it acts like there is no load?
08-30-05, 07:44 PM
#7
Rotary Enthusiast
Thread Starter
The rev limiter is at its normal setting, and I forgot to mention the strange *** hesitation only occured in 4th gear..
I changed my plugs very rcently and the wires semi recently. I accidently pulled one of the wires out of the boot on the plug end, but I Think I got it back in there alright.
another strange thing, which could be related to the boot coming off,my timing at idle is not -4 -6 like normal stock port timing, its -4 -20 or -20 -4 , cant remember which but i'll check it next time I drive it. Also sometimes the idle timing isnormal sometimes it isnt. I've used two different power FC's to make sure the power fc wasnt fried and they both had the same symptoms. However this is really the least of my problems right now.
correct if I drive normally in third its fine, drives normally. When I go Wot, It feels like theres load untill about 4krpm or when I hit full boost and then its just dead. Feels like half the power it had before.
I changed my plugs very rcently and the wires semi recently. I accidently pulled one of the wires out of the boot on the plug end, but I Think I got it back in there alright.
another strange thing, which could be related to the boot coming off,my timing at idle is not -4 -6 like normal stock port timing, its -4 -20 or -20 -4 , cant remember which but i'll check it next time I drive it. Also sometimes the idle timing isnormal sometimes it isnt. I've used two different power FC's to make sure the power fc wasnt fried and they both had the same symptoms. However this is really the least of my problems right now.
correct if I drive normally in third its fine, drives normally. When I go Wot, It feels like theres load untill about 4krpm or when I hit full boost and then its just dead. Feels like half the power it had before.
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08-30-05, 09:40 PM
#9
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After you shift into your phantom 3rd gear, what do you do to make it right again? Next time it happens, make a note to try different things to see what it takes. Can you push and release on the clutch and it will be in gear? It could be that you've bent a shift fork (the gear selector fork) in the transmission. It sounds like it doesn't ever make it into gear. What does feel like when you pull it out of gear? Do you feel the pressure of the detents, like it was in gear?
Could it be that your shifter bushing is broken?
Are your motor mounts intact? When you zing the car up and shift, if you have a broken mount there will be a lot of slop (could be the source of your vibration) and this could be helping you to miss 3rd.
Could it be that your shifter bushing is broken?
Are your motor mounts intact? When you zing the car up and shift, if you have a broken mount there will be a lot of slop (could be the source of your vibration) and this could be helping you to miss 3rd.
08-31-05, 01:23 PM
#10
Rotary Enthusiast
Thread Starter
When I shift into third and it does that, I push the clutch back in pull it out of gear, push it back in and it works fine again. Although i'm sorry to say I dont know much about the internals of transmissions, so I dont know what a detent is, there is pressure when I remove it from gear after this happens.
It could be my imagination but third and 4th both seem to be a little bit notchier when I take them out of gear.
My motor mounts are definitely NOT in tact heh. They're old and have the same milage as the motor does. I do have a torque brace though.
shifter bushing was replaced when I got the short shifter ( sorry forgot to list that)
See my biggest question is why does it feel like such a DOG when I get on it now with any single gear pulls.. It revs up at the exact same speed, hits the same boost level, but vibrates and feels like it fell on its face when it started and is being dragged across the pavement through the rev band.
The tuning is exactly the same as it was before, and its just a slightly modified base map and has been that way for about 2 years.
It could be my imagination but third and 4th both seem to be a little bit notchier when I take them out of gear.
My motor mounts are definitely NOT in tact heh. They're old and have the same milage as the motor does. I do have a torque brace though.
shifter bushing was replaced when I got the short shifter ( sorry forgot to list that)
See my biggest question is why does it feel like such a DOG when I get on it now with any single gear pulls.. It revs up at the exact same speed, hits the same boost level, but vibrates and feels like it fell on its face when it started and is being dragged across the pavement through the rev band.
The tuning is exactly the same as it was before, and its just a slightly modified base map and has been that way for about 2 years.
Last edited by Rx-7$4$me; 08-31-05 at 01:26 PM.
08-31-05, 06:10 PM
#12
Rotary Enthusiast
Thread Starter
Oh I agree, i'm just looking for ideas is all, and they are much appreciated at that.
So it ate **** today, and it looks like my driveshaft might have unbolted itself from the diff in the back... or it might be my output shaft in the trans. The clutch still engages normally, it goes into gear fine, but once I start to hit the friction point a lot of noise and rattle comes from the mid to rear of the car. Its hard to say im going to take a look at it today or tomorrow.
So it ate **** today, and it looks like my driveshaft might have unbolted itself from the diff in the back... or it might be my output shaft in the trans. The clutch still engages normally, it goes into gear fine, but once I start to hit the friction point a lot of noise and rattle comes from the mid to rear of the car. Its hard to say im going to take a look at it today or tomorrow.
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