Rye,

I hope it works out better than Grahams pre-release guinea pig software experience.

It took 2 weeks for Mini/BMW New Jersey to fry the ECU - it eventually came back worse than it was when he sent it to BMW.

Who knows maybe they can turn your yoyo into a pogo.

Good luck.

 

This is interesting; just replaced the OEM S-lites & runflats w/ 16" alloys & non-runflats on my '04 MCS which has had a pretty annoying "yo-yo" effect since delivery. There is a marketable decrease in the perceived severity of the yo-yo symptoms. Obviously, the wheels/tires have nothing to do w/ the root of the issue, but do appear to have some impact on the symptoms of the problem.

Looking forward to a clear resolution to this apparent flaw...

 

Ryephile commented about Ryephix#1:
Is it true that you could also have disabled the by-pass valve by removing and plugging the vacuum line? Presumes that the spring forces the valve closed and that vacuum opens it.

If you have a spare by-pass valve lying about, could you please tell me the inner diameter of the actuating diaphram vacuum line? I might want to try a "barbed orifice" from Beswick Engineering in an attempt to dampen the valve oscillation somewhat. Here's what it looks like. I got a Miniature Fluid Power Products catalog from a couple of Beswick application engineers yesterday. The barbed orifice is an in-line device that comes with a micro-drilled restriction whose diameter can be from 0.004" to 0.076" in about 40 step sizes.

This might require a bit of a shotgun approach to get the correct size, though they also make a miniature needle valve.

 

I was slightly surprised to read this write up and release information on the motoringfile.com site. Probably most of you have read it and it, but I thought it was pertinent and relevant to post.

http://www.motoringfile.com/2004/05/...cs_yo-yo_issue
http://www.motoringfile.com/2004/01/...o-YoChronicles

Ryan is almost famous now!

 

--->Bradley99: While you can go the mechanical dampning route, the root cause seems to be software dampning. I do have an extra bypass valve about, when I get a chance I'll measure the dimensions for you.

About the MotoringFile article: I was feeling a bit "MotoringFile Exclusive!" at the moment, hee hee

 

Currently Koopah is having V38 uploaded on his car. He'll be the first to tell you if V38 is effective (or not). I'm still working out plans to get my ECU to MINIUSA, as I cannot work with Motor City MINI (since they banned me)

 

>>Currently Koopah is having V38 uploaded on his car. He'll be the first to tell you if V38 is effective (or not). {snip}
>>

Fellow Yo-Yo-ers,

I am expecting to have my MCS back in service this week (by 5/14) running on the new v.38 software. Ryephile will soon be running on v.38 as well. We will need to transition through the ECU's "adaptation" period before an evaluation of the v.38 upgrade can be given. I will be able to provide feedback based upon "derriere diagnostics"; Ryephile will be able to provide concrete data reported from his diagnostic equipment. Please bear with us during this period and stay tuned to this thread or the MINI2 CD 38 Update thread for the latest information.

Also, please let us know if you have been contacted by MINI to have your ECU sent in for reprogramming.

Theo

 

I picked up my v.38 updated MCS tonight and have put roughly 50 miles on it with some VERY PRELIMINARY testing that appears to be optimistic. In order to avoid cross-posting, please read my caution and preliminary report on MINI2 HERE.

I will have more to report on Sunday or Monday after I have put on about 300-400 more miles on the clock.

Theo

 

Miles since V.38 update: 538

I think we have a winner here!

Please read the results of my informal (butt-dyno) testing in the MINI2::Cooper S::CD 38 Update thread.

And a huge thank you to Ryan...GOOD SHOW, MAN!

Gentlepeople, start your June service appointments...

Theo

 

Thank you Koopah for relaying your findings. It's already a breath of relief, even though my car doesn't have V38 yet! I should be having MM2 sent off next week for the new software; I can't wait to test it out.

 

Ryan-

Thanks for your hard work and persistence. Can't wait for June.

Duncan

 

The Yo-Yo in my car is very annoying and I am fed up with it. I haven't bothered to take it to the dealer because everybody says that they can't do anything about it and the "fixes" seem to make it worse from what I have read. So I am very excited to read this!

How do I go about getting the software V-38 installed? Do I just call my dealer and tell them what I want?

 

Rick - read the post just above yours

To review:

*V38 will be at dealerships starting in June. If your dealership sucks (has a low CSI), then it will take longer. When your desired dealership recieves V38, simply make an appointment to have it uploaded. ECU updates are free for life (not just warranty period!)

*My fixes don't make the Yo-Yo worse! They FIX it, otherwise they wouldn't be "Phix's" The only downsides to either of my Phix's is they decrease fuel economy slightly.

I hope that clears up any confusion,
Ryan

 

I have approximately 1600 miles on my '04 MCS and have been fortunate (compared to many on this thread)not to experience any of the yo-yo issues so far. I am of the "If it ain't broke, don't fix it" philosophy so my question is this: are there any good reasons other than fixing the yo-yo to get v38 downloaded to my ECU?

 

Thanks. My dealer is Crevier in Orange County, CA. I look forward to getting this issue resolved because the new r34 VW is very tempting!

 

^^Or do you mean the R32, the overweight and overpriced highpower AWD Golf?

 

>>I have approximately 1600 miles on my '04 MCS and have been fortunate (compared to many on this thread)not to experience any of the yo-yo issues so far. I am of the "If it ain't broke, don't fix it" philosophy so my question is this: are there any good reasons other than fixing the yo-yo to get v38 downloaded to my ECU?

My suggestion....

If it ain't broke, don't fix it.

Theo

 

Anyone know if MINI will be producing the late '04s (and '05s for that matter) with the new v38 ECU?

If so, will they update those MINIs currently at the VPC with v38?

Thanks.

-Buck

 

The VPC is supposed to load the most current software once they land here in the states.

 

The sure-fire way to know if V38 is already at the VPC is to have the new-owners tell us if their MCS's Yo-Yo or not! For the sake of the newbies, let's hope the VPC already is using V38

 

they're not. I picked mine up on Friday morning and the yo-yo was quite apparent right from the start. booo

I think its extra worse for a new mini owner to experience yo yo. I know I could get rid of it by just driving quicker with mroe acceleration but i'm stuck below 4500rpm and I have to keep away from the wot... boo hoo :smile:

 

I spoke with MINIUSA and my dealer. They both said that v38 will NOT be installed on new MINIs. Instead, they'll stick with v36 and only install v38 if the new cars exhibit problems.

Why wouldn't they install the latest version? Do they need to beta test it first with cars already exhibiting yo-yo, stumble, etc.?

My fingers are crossed...

 

[raises hand] Beta testing in-progress!

MM2 left on a flatbed for Classic MINI today to have the ECU sent to the engineering lab in New Jersey for V38 to be uploaded. I hope to get the car back by next Friday, as I have an autocross next weekend! Motor City MINI was deliberately left out of the equation due to them being difficult to work with.

--->jefe, sorry to hear your newborn has the Yo-Yo Hopefully by the time you pass break-in V38 will be at dealers!

I'm a bit surprised to hear that V38 will be a "by request only" upload. When I talked to the MINI execs today, they were noticeably enthusiastic about V38 being a big improvement in drivability over past versions. I suppose I'll have to enquire on the future production implementation of V38.

Something I've been thinking about; the MY05's claim to have a "tweaked ECU" which helps boost the output to 170 vs. 163 base from release through MY04. I'm wondering if the entire ECU is different, or if only the software is different, or perhaps both, thus negating MY04 and prior from uploading MY05 code. This is obviously beyond The Yo-Yo Chronicles, but nevertheless something to find out in the near future. What's interesting to note, that since BMW/MINI's policy is free software updates for life, wouldn't the new MY05 ECU code be part of that, or will there be a separate clause segregating the old from the new. hmmm....

 

170 hp and v.38? Interesting...

Well, you know I do feel more of a pull in the 2800 - 3000 rpm range though I'm not sure if that is mainly due to the LACK of the yo-yo which (for me) was just beginning in that rpm range. Plus, I'm not sure that +7 hp would necessarily correlate with a torque range shift/expansion.

I can definitely vouch for the driveability issue. Much smoother under acceleration and it really spanks poop at about 4000 rpm. I must also confess that this is the first time I have felt my MCS needed better rubber, since (with DSC off) I am feeling wheel slip under hard acceleration. Mind you, its no JATO MCS, but it is quick enough for me!

Ryephile, have you access to a dyno to test MM2 when it returns? Do you have any "before" dyno data with which a comparison can be made?

Theo

 

Well, I have bone-stock dyno pulls, and then my nicely-modded dyno pulls, so the only relevant comparison would be showing how much power I lost (if any, LOL) versus V36 with the Powerchip reflash.

Classic MINI called me Friday morning to confirm they were shipping out the ECU that day. I reminded them OVERNIGHT AM delivery, so MINI HQ gets it bright-n-early Monday morn'.

--->Theo, next time I chat with PK I'll ask if V38 and the MY05 +7HP are related.
crossing my fingers for a speedy MM2 return!
Ryan