Clutch slip on a dyno plot
Thread Starter
HHIC
Joined: Nov 2002
Posts: 19,087
Likes: 0
Re: Clutch slip on a dyno plot
Originally Posted by Fabrik8
Clutch slip is bullshit. If the clutch was slipping at a certain torque, it would plateau at the same point as the torque rose back up. There is no indication that that is happening at all. I'm guessing the ECU is cutting power when it senses an overboost condition or something along those lines, like you're saying. I've heard some interesting things about VW ECUs trying to regulate boost in wierd ways once the engine has some mods to it, so this is probably a reflection of that. Modern ECUs kinda suck because they try to do fault correction every time they see something the least bit different from stock.
It would be nice to see some sensor data, I'd like to see the throttle position and manifold pressure during that dip.
The second peak is a little stranger, it looks like the ECU is doing some boost control, the turbo is probably running out of flow around that area. They have a crazy smoothing factor on that graph, it's probably hiding some interesting info.
Is it a Dynapack? Tire slip really would be fun to see then..
It would be nice to see some sensor data, I'd like to see the throttle position and manifold pressure during that dip.
The second peak is a little stranger, it looks like the ECU is doing some boost control, the turbo is probably running out of flow around that area. They have a crazy smoothing factor on that graph, it's probably hiding some interesting info.
Is it a Dynapack? Tire slip really would be fun to see then..
I think the line at the top of the graph after the torque peak could be clutch slip. It slips at a certain RPM and then plateaus after that. The owner of the car did say his clutch slipped so I'll buy it at the topof the powerband.
BTW, this is on a VR6 turbo. It's not a stock turbo car so the ECU is playing no part in boost control other than closing the throttle momentarily if the ECU calculates a too rapid torque increase.
I'd really like to find a dyno plot of clutch slip so I can post it up in there and shut Rich up.
This is the thread on VWVortex just for reference:
http://forums.vwvortex.com/zerothread?id=2682521
Also, this is the dyno plot on the car that EIP did themselves. Notice the VERY slight dip in power at the same RPM. If you dyno the car immediately following an ECU reset, the powerband will be very smooth. It takes a few miles of driving for the ECU to "learn" and then the ECU starts adapting all of these "safety measures" which ends up with the HUGE power loss at ~4000rpms that the other dyno plot shows.
Originally Posted by Corey
If that is a chart from EIP's dyno then it is not a dynapack.
That's not from EIP's dyno. Here's the car on the dynapack:
The dyno plot I just posted is from EIPs dyno.
Last edited by Flite; Jul 16, 2006 at 02:31 PM.
Thread Starter
HHIC
Joined: Nov 2002
Posts: 19,087
Likes: 0
Re: Clutch slip on a dyno plot
Originally Posted by Corey
How much? I need to sell my Miata. Sell that sucker for me.
EDIT: EIP is worthless except the fact that they have decent hardware. I've heard problems of ill-fitting piping, but other than that, no complaints (hardware wise).
EDIT: EIP is worthless except the fact that they have decent hardware. I've heard problems of ill-fitting piping, but other than that, no complaints (hardware wise).
Ya know, you could always just trade me cars. That would be easy.
Last edited by Flite; Jul 16, 2006 at 03:13 PM.
Thread Starter
HHIC
Joined: Nov 2002
Posts: 19,087
Likes: 0
Re: Clutch slip on a dyno plot
Originally Posted by Corey
WTF? You want my Miata? Give me a call sometime tomorrow and we can see what's up. 
Maybe the S2K and Miata could share a spot on the boat?
Maybe the S2K and Miata could share a spot on the boat?
Haha, I could drive a Miata for the next couple years. The S2000 is actually my old man's car. He's just sending it to me because he never gets to drive it anymore with his job. If that's something you think you would actually consider just let me know. You could do better with it out there anyway. It's hard to build a seriously fast VW out here when there are no tuner's or installers for the stuff on the car.
I don't know how much you owe on your car and that kind of stuff. I'm sure there're some logistics to figure out. I would consider it though. There's no more 1/4 mile out here....just AutoX.
I guess I should stop jacking my own thread huh? Shoot me a PM sometime or I'll try to catch you on AIM.
WIKAP WIKAP PLBTTTTT
Joined: Feb 2003
Posts: 2,002
Likes: 0
From: NOVA
Re: Clutch slip on a dyno plot
Originally Posted by HighPSI TSi Guy
RPM and mph. compare them.
See if you can't get the A/F plot as well. They may be going very rich at the power dip or it could be an issue with timing...
On another note, anyone have a dyno graph showing compressor surge on a turbo?
Thread Starter
HHIC
Joined: Nov 2002
Posts: 19,087
Likes: 0
Re: Clutch slip on a dyno plot
Originally Posted by Corey
Send (pm) me links to pictures of your car on vortex and specifics on the current setup.
/threadjacking.
Down with EIP (tuning at least)
/threadjacking.
Down with EIP (tuning at least)
EIP stage 2 turbo kit
3" catback
3" highflow cat
3" downpipe
HKS BOV
Turbosmart WG
APEX-i AVC-R
AEM wideband 02 guage
Autometer boost guage
034EFI stage IIc stand alone
680cc flow matched injectors
KW V1 coilovers
17" ASA AR1 wheels
Shocker sticker