[O-cha]

http://www.rrtsuspension.com/forum/viewtopic.php?t=324

[fast_lap28]

very nice find Ocha! ....interesting, never heard of these guys before. their AST suspension upgrades will be worth subscribing

[O-cha]

Yea it's very interesting, especially the part about the dinan tune going into limp mode :hide:

[e90AW335i]

Originally Posted by O-cha

Yea it's very interesting, especially the part about the dinan tune going into limp mode

*edited*

[sparkyg]

The Dinan tune needs the Dinan OC on the track. The code they threw with the OC was caused not by temp but by repeated redlines

O-Cha, stirring things up.

[O-cha]

Originally Posted by sparkyg

The Dinan tune needs the Dinan OC on the track. The code they threw with the OC was caused not by temp but by repeated redlines

O-Cha, stirring things up.

Lol I didn't say anything about oil temps. How is repeated red lines an excuse for limp mode though?

But yes, I am stirring things up.

It's actually interesting as I've wanted to see the oil cooler installed for some time.

[leftcoastman]

Lastly, we expereinced a fault code on Friday while Barry flogged the car. After some process of elimination work (not oil temps, not fuel starvation, not bad gas) we determined that taking the car consistently to redline sent the engine in to reduced power. Pitting and shutting off the motor cleared the fault code and off we went again. Staying at no more than 6500 rpm before a shift worked fine and we did not expereince the engine power down again the entire weekend (curious if this has been an issue with anyone else?)

Oh my god, that SUCKS!!!! I have gotten limp on track with PROcede before and I always thought that the Dinan would be limp free.

All my procede limps were related to running it to redline. Looks like Dinans have the same problem.

[Bubbles]

Originally Posted by leftcoastman

Oh my god, that SUCKS!!!! I have gotten limp on track with PROcede before and I always thought that the Dinan would be limp free.

All my procede limps were related to running it to redline. Looks like Dinans have the same problem.

Never experienced a limp, while running to redline.

[sparkyg]

Dunno on the redlines, our cars are so complicated maybe there is a built in, "I am tired, I need to rest" mode.

[Lane]

I wonder how were they able to put 265 tires in front despite the drop....

[leftcoastman]

Originally Posted by Bubbles

Never experienced a limp, while running to redline.

That's encouraging to hear.

Is this on the street or on the track? The two are completely different.

I can't remember ever getting limp on the street but it has happened on track.

[O-cha]

Originally Posted by Lane

I wonder how were they able to put 265 tires in front despite the drop....

Camber.

[NYCGarbagePrince]

It was an overboost code.. Great find though.. can't wait for today's installment

[NM_BMW]

Originally Posted by O-cha

Yea it's very interesting, especially the part about the dinan tune going into limp mode :hide:

Am I reading it wrong? They went into limp March 6th. Then on April 28th they reported they installed the Dinan tune as well as the AA bov, and FMIC. So did they hit limp with no tune?

EDIT: nevermind... I read further.

[O-cha]

Originally Posted by NYCGarbagePrince

It was an overboost code.. Great find though.. can't wait for today's installment

No they were TOLD it was an overboost code which they erroneously tried to trace to the blow off valve.

[b335i]

Tracked them on that GPS website, pretty cool. Great blog, and find O-cha!

[O-cha]

Originally Posted by b335i

Tracked them on that GPS website, pretty cool. Great blog, and find O-cha!

I missed that. I think the blog is just being relayed there as they are sponsors, I really wish I could get that info about the throttle control to the drivers. I'm sure it's a bitch trying to drive with those stock valves when they don't have to, would be crippling on track.

[Mattscott]

Originally Posted by sparkyg

Dunno on the redlines, our cars are so complicated maybe there is a built in, "I am tired, I need to rest" mode.

Yeah it's more often referred to as, limp mode.

[OpenFlash]

The Overboost limp has to do with excessive pressure measured by the TMAP sensor, causing the factory to drop wastegate duty cycle below a certain threshold which causes the limp. Conversely, a Underboost limp is induced if there is too little pressure measured by the TMAP sensor, causing the wastegate duty % to go too high for too long.

Starting with v3, we get around both of these problems by employing a PID-based "watchdog" system that keeps perceived wastegate duty % within the desired range of a perfectly stock car under perfect conditions.

This, btw, is one of the problems with the factory boost control system. The problem isn't significant enough at stock boost levels. But once raised, the allowable "window" shrinks as does your probability to stay limp-free.

Shiv

[O-cha]

Originally Posted by shiv@vishnu

The Overboost limp has to do with excessive pressure measured by the TMAP sensor, causing the factory to drop wastegate duty cycle below a certain threshold which causes the limp. Conversely, a Underboost limp is induced if there is too little pressure measured by the TMAP sensor, causing the wastegate duty % to go too high for too long.

Starting with v3, we get around both of these problems by employing a PID-based "watchdog" system that keeps perceived wastegate duty % within the desired range of a perfectly stock car under perfect conditions.

This, btw, is one of the problems with the factory boost control system. The problem isn't significant enough at stock boost levels. But once raised, the allowable "window" shrinks as does your probability to stay limp-free.

Shiv

If you're telling it it's at the proper boost though, why does it need to try to adjust down the waste gate DC?

I couldn't get the car to run at 0% my last track day, does it have something to do with this?

[OpenFlash]

Originally Posted by O-cha

If you're telling it it's at the proper boost though, why does it need to try to adjust down the waste gate DC?

I couldn't get the car to run at 0% my last track day, does it have something to do with this?

We're not telling anything that it's at the proper boost. We're just inducing offsets to the MAP sensor and then adjusting the duty cycle accordingly. The problem here has to do with a physical issue (throttle close and excessive boost build-up in the IP pipe). Even with our offsets induced, the reading is still too high and the factory ECU is trying everything it can to reduce it. First still is lowering the duty cycle. But if it goes too low (and it will if boost prior to the throttle closure was higher-than-stock), it will trigger the limp. Our proprietary PID-based watchdog jumps in and drops duty cycle at a very fast rate if it sees this about to occur. Having the PROcede scaling down the duty % keeps the factory ECU's perceived duty cycle in the acceptable limp-free range.

Shiv

[leftcoastman]

Originally Posted by shiv@vishnu

We're not telling anything that it's at the proper boost. We're just inducing offsets to the MAP sensor and then adjusting the duty cycle accordingly. The problem here has to do with a physical issue (throttle close and excessive boost build-up in the IP pipe). Even with our offsets induced, the reading is still too high and the factory ECU is trying everything it can to reduce it. First still is lowering the duty cycle. But if it goes too low (and it will if boost prior to the throttle closure was higher-than-stock), it will trigger the limp. Our proprietary PID-based watchdog jumps in and drops duty cycle at a very fast rate if it sees this about to occur. Having the PROcede scaling down the duty % keeps the factory ECU's perceived duty cycle in the acceptable limp-free range.

Shiv

Sir - I can assure you I will be testing this extensively on track.