An indicator of a slipping clutch will be that the rpms will rise without an increase in speed. You can test this by logging speed and rpm. If the ratio of rpm to speed changes as the car reaches peak power during a pull, then the clutch is slipping.

 

definitely what is going on. Is there any other possibility that a diff or transfer case could exhibit this kind of behavior? I guess I am off to the tranny forum....

Thanks
M

 

All signs point to you shifting here ... you sure you didn't shift? Look at the RPM drop.



EDIT :: Also, the difference in load:RPM seems to indicate a boost leak. You pulled off the LICP to install the housing, right? Do a boost leak test as it could cause the loss in power you are feeling.

 

It might look like it, but in that particular log I am actually demonstrating a weird situation I was having where I could log the TPS blipping down and back up. You can see by the ramp back up that I am not getting back on the gas. And the RPM is steady (orange).

Boost leak is interesting. I will have to search on how to do that test? Is it simple?

The TPS jumping around with my foot pegged was unnerving. I have since slacked the throttle cable by losing the adjustment bracket a bit and it is doing this less frequently now. Not 100% sure it is the cause/solution.

The second log I posted is more common now.

M

 

I'm sorry man ... that log shows a shift. The RPM is not steady, it drops from about 6800 to around 5300 which is about the same amount that it drops on a shift. Also, boost is higher when the TPS comes back in and ends up at a bout the same place it was at 5300 or so when you started the pull.

RPM is decided upon mechanically and that drop will not happen if you don't shift. It might bounce a couple hundred RPM up and down if something were awry, but that's not happening either. If your clutch were slipping, RPM would go up and load would drop. That's not happening.

If you honestly don't think you shifted, please log a shift (2 - 3, 3 - 4) and post the results. If it looks different, I'm wrong. I just think you've mixed up the logs and are worrying yourself for no reason.

 

Don't be sorry, any input is helping me figure this car out. There are tranny issues, and I am noobing my way around ecuflash etc.

I have several pulls that show that behavior and I was only ever using one gear. However there is possibility that in the 50 or so logs in the last 2 weeks, that you are right and I confused a few. But, they all look like that. A studder of sorts. Since then I have tuned out some timing and gotten knock to 0. I need to do some fresh logs tonight and try to see if I can recreate that studder, or what I saw as a TPS blip.

I might be able to induce it by adjusting the throttle cable taught again.

The log has the gear, but that doesn't seem to mean much. It changes by 100ths, so i don't know what that is supposed to indicate. I expected it to be 1 through 6 if I logged all the way through all shifts.

M

 

I logged last night, and was NOT able to reproduce what I was telling you. However I also didn't try to re-adjust the throttle cable, because I got side tracked on other log data. I logged shifting and then compared the logs to the one I posted, and they match exactly, supporting exactly your logic. Thanks. If I can log what I was claiming that is current I will post it again in case it is a sign of something else I should take care of.

My last night concern was my new LC1 registering weird anomalies usually just before the pull. normal AFRs and then, 88.34, and then 14.2 again. During the pull the numbers were as expected, but consistently once or twice in a log the thing would jump crazy up. Is that normal or a sign of something else.

I am also at the same time dealing with what looks like boost too high, at a spike of 25 and then tapering to 21. That could be part of my clutch slippage I suppose.

I am having a few too many possible issues at once, and its getting overwhelming. I think I bought the evil step child lemon car.

M

 

I think its pissed that you have a Subaru for your avatar.

 

Crap, its also parked next to the subaru in the garage!!!!!
Oh, and the subaru is and has always been trouble free. What gives! Well until I grenaded the front wheel bearings at Willow.

Could you guess at a setup error I made while flashing the talbe for the JDM MAP sensor install that would yield the higher boost. I haven't installed any pills (unless they were already in the car). Could my calibration settings be off somehow, or am I actually pushing 25psi, and I have flashed in a way that is requesting for that.

What tables would you want to see screen shot to make a comment?

Also, is it a waste of time to try and tune if the clutch is slipping? Will that just give erratic numbers, or should I tune and beat the rest of the crap out of that clutch?

M