I had v37 flashed yesterday on my JCW MCS.

On a few occassions, I have noticed a power drop around 4k RPM when I shift from 1st to 2nd gear. I hope v37 will fix the problem. Time will tell! :smile:

 

No, leaving the linkage attached shouldn't cause any damage. I removed it to keep the tension off the zip-tie, to ensure the valve stays 100% shut at all times. As long as your zip-tie is sturdy enough, you shouldn't have any problems.

Timeline: MINIUSA should be releasing V38 in about one week.

 

>>Timeline: MINIUSA should be releasing V38 in about one week.


I'm beginning to hear the Jeopardy theme song in the background of these posts!



Theo

 

I had V.37 installed on my car today at Rasmussen in Portland. Before making an appointment, I asked Ann, the SA, how many cars they had installed 37 on and how many of those had yo-yo. She reported that they had put 37 on half a dozen or so cars and that they all had yo-yo. Since having the software installed, I have driven about sixty miles. There is a definite difference in the way the car runs - noticeably smooooooother. So far, I have not been able the get it to yo-yo. Just smooth acceleration through my previous yo-yo range of 3000-4000 RPM. Finger crossed and smiling.

JustGo4It, update information for your yo-yo list ..... my car is an '04 MCS built 10/03 vin TD76906

 

>>>>No, leaving the linkage attached shouldn't cause any damage. I removed it to keep the tension off the zip-tie, to ensure the valve stays 100% shut at all times. As long as your zip-tie is sturdy enough, you shouldn't have any problems.
>>
>>Timeline: MINIUSA should be releasing V38 in about one week.

Will be checking with the local service center soon for v.38 as I'm creepin up on the 10000 mile mark and am due for a visit...

Hopefully your Fix will lbe in v38 and they should kick down something to recognize all the effort for you've put into making the yo-yo go bye-bye for the Cooper S community. As I found myself not even thinking about the yo-yo with RyePhix #1 in place!

thanks again Ryan you rock!

-okeetpn

 

Had V37 installed last week. Had a very strong Yo-yo before. I still have it, but it has moved down the RPM band from around 2900 to just above 2000; this is making in-town driving a pain in the A$$. The MINI now also has a hard snapping transition from on throttle to off throttle.
I'm getting to the point that if V.38 doesn't fix this, I'm getting out...My MINI is my daily driver and has always had a strong yo-yo, it's getting to the point that I don't enjoy driving it with these characteristics.

 

I had V37 downloaded yesterday at Northwest MINI in Tacoma and, while it's still early, the car accelerates much more smoothly now, doesn't hesitate off the line the way it used to, and no longer stutters/flirts with stalling whilst backing out of a parking space, etc. when cold. Thumbs up.

 

I'm waiting for version 99 to get my ECU flashed

 

>>I'm waiting for version 99 to get my ECU flashed


Hey ... isn't v.99 the one they're using to get the additonal 7 HP for the MCS Cabrio?

Theo

 

V99

 

The reason the Yo-Yo fix is taking so long is Bill Gates has hired the MINI software engineers because of their ability to produce code.

 

I had version 37 put in my MCS at Rasmussen's in Portland on 4.20.04. Dramatic improvement, smooth acceleration, no yo-yo. The car feels great. The service team at Rasmussen's especially Ann is Great!

 

Well, I just picked my MCS from the dealer last Wed. It has the YOYO but, it's not terrible. How can I tell what version of the software is installed on my Mini?

-Donut

 

It probably has 36 since 37 is so new. There is no point in getting 37 because it isn't a permanant fix, and according to some sources only has updates for BMW cars.

 

OK Fellow YoYoers,

Tomorrow is the big day; the end of April! Version 38 should be sailing through the net into your dealers computer systems. Time for everybody to call and find out the availability.

After all, MINI did say the end of April didn't they? I really wasn't paying attention 'cause I was buying this bridge in Manhattan and.....

Theo

 

i have a relatively new MCS and haven't noticed the yo-yo yet.
but now that i've read all fo these posts i'm probably going to go crazy looking for it and try ng to reproduce it in my car.
i generally accelerate through 2k- 3k rpm at more than 30% throttle so i may not have noticed it. :smile:

i'll post tomorrow and may have to add my name to the list if i have the dreaded yo-yo

 

so the verdict is no yo-yo.

however, my saab9-5 wagon does yo-yo during easy acceleration just as you are describing in the forums. i'm going to try some of the things that Ryan has suggested in his posts.

 

>>so the verdict is no yo-yo.
>>
>>however, my saab9-5 wagon does yo-yo during easy acceleration just as you are describing in the forums. i'm going to try some of the things that Ryan has suggested in his posts.

I find this very interesting. I too am seeing the yoyo effect; not in a MCS or a even a SAAB, but in my interstellar space crusier. Once this fix is done, I will probably fix that yoyo in my bicycle and I am pretty sure my toaster has started showing signs of the yoyo as well.

Cheers!

_________________
MCS -- BRG/B, MFSW, sunroof, leatherette, heated seats, DSC, fog lamps, 16" v spoke, JCW, OneClick

 

>...disconnected the vacuum pump linkage from the bypass valve, and then zip-tied the linkage such that the butterfly is permanently closed...No Yo-Yo!...nothing but smooth...acceleration...

Ryephile,

If locking the valve shut is solving the yo-yo/improving acceleration, can you see a reason not to just remove the bypass valve altogether (aside from fuel economy)?

 

Following the thread with interest. '04 MCS with 1200 miles, yo-yo present, TD85657.

I'm concerned about the effectiveness of a software fix that attempts to correct what appears to be an underdamped mechanical feedback system. The two mods so far, Rhyfix #1 and #2, implement changes to the operating point of the bypass valve; in one case eliminating its operation, in the other by changing the pressure at which it begins to operate. Has anyone tried increasing the system damping by adding a restriction orifice (and possibly a vacuum chamber) to the pressure source for the bypass valve actuating diaphram? Properly adjusted this would dampen the oscillation but would still provide a reasonable value response time, while maintaing the designed point of operation (in theory anyway). My MCS is a little too fresh for me to attempt mods at this point. The yo-yo is quite annoying though.

 

The ECU software IS the source of the oscillation effect. Fix the software and it will not induce oscillation.

Theo

 

Ok gang, here it is 5/5 and the V38 software shoul be in the hands of the dealers. Has anyone heard anything yet?

Cheers,

JD

 

jdgross,

You must be dreaming dude.

Do you know how many times BMW have said they will have a fix for the yoyo coming out soon. Let alone give a date and fix that actually works is dream land.

 

Bradley99 wrote:
That's a good idea. I don't seem to have the yo-yo, but when I installed my boost gauge, it rattled under boost. I installed a small fuel filter in-line between the boost tap and the gauge. It damped the pulses nicely.

 

THE UPDATE

MINIUSA has leaked that V38 is completed! However (yea yea, here's the "but&quot, the software won't get to dealerships until first thing June. MINI has allowed an accomodation to have me send them my ECU and have it reflashed prior to the dealership release, so I can forward to you if it really works.

Cheers,
Ryan