MTH V7 (aka Flat Spot Fix)
6th Gear
Joined: Jun 2004
Posts: 1,216
Likes: 17
So does that mean that the first part of your initial statement still holds? I.e. that hardware is to blame? I've been searching quite profusely and others have said that the flat spot appeared after one of the recent software upgrades.
But interestingly enough in my case, it only became evident when I changed my throttle body. But then maybe the stock tb just hid a problem that I didn't notice.
Hm...
But interestingly enough in my case, it only became evident when I changed my throttle body. But then maybe the stock tb just hid a problem that I didn't notice.
Hm...
2nd Gear
Joined: Jan 2006
Posts: 81
Likes: 0
From: The Netherlands
VT7 is that for the Cooper S?
I drive a One. My tuningspecialist has tuned my MINI last Summer (at the end). But how do I now I 've paid for "Tuner file" and not or the "Standard file"?
Has there been an update (VT7) yet? If there is a update, than I could take that. I've paid for it!
I drive a One. My tuningspecialist has tuned my MINI last Summer (at the end). But how do I now I 've paid for "Tuner file" and not or the "Standard file"?
Has there been an update (VT7) yet? If there is a update, than I could take that. I've paid for it!
Here's my take....
I think the flat spot appears as two things happen.....
1) Larger TB, but this in itself isn't enough to do it.
2) More mods with more extreme tune.
The combo of the two will get it to rear it's ugly head. This isn't just MTH, but the MTH tune does "bring it out". I've seen other posts with other tune suppliers that have had the same symptoms.
I think that the issue comes down to when the bypass valve is opening/closing (mostly closing, as this is what happens when accelerating).
One easy test I haven't done yet is to wire tie the BP valve closed, and see if it goes away. If it does, that would mean that the ECU can't really interpret the transition between bypass open and closed.
Matt
1) Larger TB, but this in itself isn't enough to do it.
2) More mods with more extreme tune.
The combo of the two will get it to rear it's ugly head. This isn't just MTH, but the MTH tune does "bring it out". I've seen other posts with other tune suppliers that have had the same symptoms.
I think that the issue comes down to when the bypass valve is opening/closing (mostly closing, as this is what happens when accelerating).
One easy test I haven't done yet is to wire tie the BP valve closed, and see if it goes away. If it does, that would mean that the ECU can't really interpret the transition between bypass open and closed.
Matt
Originally Posted by Dr Obnxs
I think the flat spot appears as two things happen.....
1) Larger TB, but this in itself isn't enough to do it.
2) More mods with more extreme tune.
The combo of the two will get it to rear it's ugly head. This isn't just MTH, but the MTH tune does "bring it out". I've seen other posts with other tune suppliers that have had the same symptoms.
I think that the issue comes down to when the bypass valve is opening/closing (mostly closing, as this is what happens when accelerating).
One easy test I haven't done yet is to wire tie the BP valve closed, and see if it goes away. If it does, that would mean that the ECU can't really interpret the transition between bypass open and closed.
Matt
1) Larger TB, but this in itself isn't enough to do it.
2) More mods with more extreme tune.
The combo of the two will get it to rear it's ugly head. This isn't just MTH, but the MTH tune does "bring it out". I've seen other posts with other tune suppliers that have had the same symptoms.
I think that the issue comes down to when the bypass valve is opening/closing (mostly closing, as this is what happens when accelerating).
One easy test I haven't done yet is to wire tie the BP valve closed, and see if it goes away. If it does, that would mean that the ECU can't really interpret the transition between bypass open and closed.
Matt
Have you tried the wire tie trick yet? curious to hear back on your comment. I've got the flat spot that I think is contributed from a large TB and it's very annouing. If MTH can't fix it then what can? Maybe you can do an article in MC2 about it.
4th Gear
Joined: Feb 2004
Posts: 320
Likes: 0
From: Pendleton, IN
For what its worth, I've noticed a pattern on my MCS. The VGS mod, the zip-tie trick, heavier spring, and anything else that closes the bypass valve any faster than stock, produces the flat-spot. The heavier spring and the VGS together, REALLY made things ugly.
Now, I have by BPV configured back to stock and the flat spot is only minutely noticeable.
Now, I have by BPV configured back to stock and the flat spot is only minutely noticeable.
4th Gear
Joined: Feb 2004
Posts: 320
Likes: 0
From: Pendleton, IN
Swapped out Helix's old Bosch 380cc "single stream" injectors for Helix's 380cc dual stream injectors... the goal being to get a correct fuel stream aimed at each intake valve, instead of a single stream striking the port divider.
While I've not noticed a peformance difference, the flat spot is finally gone in my MCS, and Blu is running smoother.
While I've not noticed a peformance difference, the flat spot is finally gone in my MCS, and Blu is running smoother.
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jarymo
Hawaii MINI Motoring Club
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