I was just browsing my logs after my 100% completed road tune back in august 14th and I see 655/579 @ 40psi yet another log shows 645/601 @ 41.6psi .. when you just gain torque and the HP stays the same or goes lower does that indicate the turbo is out of its efficiency level? I am not going to run the turbo this hard ever again unless im at a track but im just curious.

 

Check what your boost is at peak HP for both logs.

Can't really just go from peak boost numbers.

(unless that's what you were quoting )

 

Not to change the subject at hand but what turbo was this with and Im wondering if the exedy twin wasnt slipping with this huge torque!

 

might also be to do with air temps, if there is a slight incline in the road etc, also if logs are back to back the turbo may already be spooling for the second run

 

did you ever log 2byte air flow hz? that might help show it...

 

FP Black. The clutch did slip aug 15th on the way to the shootout in 5th gear, but not in 3rd ever that I know of.

 

You have to look at all variables at the peak HP from both logs...timing, afr, air temp, boost, etc.

You're probably pretty close to maxing out that black, though, so the higher boost run would probably end up at about the same peak HP as the lower boost run if so, all else being equal.

 

I have the ecu disabled to pull timing based on air temps.. I know what you're saying tho.. maybe heatsoak or something odd.

nope.

same boost identical cept for peak tq area.. thats why im confused why it lost power

 

this doesnt make sense to me.. all started at same rpm.. all using same boost. same timing on the logs its not using different timing and 2 pulls 40wtq more then the other.. i hope that doesnt indicate clutch slipping. the green line is timing adjustments uptop but nothing downlow.

 

eh.... nevermind im stupid. this is why you shouldnt be on a forum at 4am. I am comparing 2 seperate runs where i adjusted timing LOL. no wonder its different uptop.. but im still curious why its doing what its doing downlow at peak area. is this clutch slippage? 1 and 3 are identical boost, but way different torque wise?

 

Ya im not going to run it like this again most likely. I just wanted to see what I could do at high boost. The most I'll go is 33-36psi probably.

I'm more concerned about the peak torque area with logs 1 and 3

 

If you want to see if your clutch is sleeping log RPM and speed. Then plot RPM/speed or speed/RPM. It shouldn't change through the gear.

 

If you're just looking at virtual dyno plots, clutch slipping would be spikes in the graph upwards...artifically high numbers during the slippage.

Looking at your plots above, it looks like two of the runs may have been slipping, but I couldnt tell you that for sure without the data.

 

Alright. It did slip to the shootout when I was just cruising in 5th gear for like 5-6 hrs (450 miles one way)....... would that indicate its going bad or does exedy twins not like being cruised in 5th gear for that long of a time? can they get glaze on them from running to long or anything like that? just curious.

 

I personally can't answer anything about the exedy twin. I wouldn't doubt that you're making more torque than it can handle though.

Do any of your logs have speed in them?