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Old 26th October 2008, 21:48   #181
darren_dallas
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Quote:
Originally Posted by keang24 View Post
Did you record the Throttle Sensor Position at high RPM? Consistently open? or try to close down a little? That could be a problem with throttle try to close so the car feel bog down at high speed.

wish you best of luck,
I have numerous data logs and have shipped the spreadsheets to the Tech at Dinan. The absolute throttle position % stays constant at WOT. Good thinking Kenny...please keep 'em coming.
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Last edited by darren_dallas; 26th October 2008 at 22:00.
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Old 26th October 2008, 22:00   #182
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Originally Posted by ///Marshall View Post
What the heck?!?? I'm sorry to hear you guys are having problems.

I don't get why Dinan isn't all over this. If I were in your situation I
would definitely ship it to Dinan. I would have low confidence that the
dealership would figure out the problems. Dinan should be stepping
up and making this process as easy as possible for you guys. I don't
get why you have to ship the car out on your dime but unfortunately
if that's what it takes I think you have to do it.

BTW, perhaps this should be a separate thread. I had no idea you
guys were having problems until it was mentioned in a different thread.

Dinan was made aware of this last Tuesday afternoon and I did personally get a call from Steve Dinan and their lead tech support engineer. Their first reaction was "bad gas", even though I explained it was affecting two cars that are parked in different areas of the metroplex (about as far apart as San Jose and San Francisco for example) and use different gas stations, and the fact that I just took a road trip over the past weekend and filled up at probably 3-4 different gas stations during the excursion.

So bad gas was not necessarily a likely culprit. Regardless, the next day I filled up at a Chevron and had a few gallons of race fuel put in to top of the octane level. Dinan also shipped a new tune they had been using on Steve's car only which was installed on Thursday of last week.

With the new ecu tune nothing changed even though I can see slightly more advanced ignition timing, the lack of performance is still the same.

I had my dealer replace the MAF sensors Saturday morning at the suggestion of another BMW tech shop (Performing Imports in ATL) which seemed a plausible solution, but unfortunately that didn't fix it either.

Steve Dinan personally offered to send me a new motor during my conversation with him Tuesday afternoon. I may follow-up with them on that offer. I'd rather go that route than send them the car, unless of course they want to pick up shipping.

I'll keep everyone posted as we progress through this situation.

Thanks again everyone!

Regards,

Darren
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Old 26th October 2008, 22:09   #183
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Thats real strange......

The strangest part is the car looked so healthy in the video against RaceMx...
it real odd that it would just get sluggish out of nowhere.

Hopefully its just a quick fix.
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Old 26th October 2008, 22:10   #184
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Clutch
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Old 26th October 2008, 22:13   #185
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Can you post up the dyno jet graph.....

That might help alot. Seeing the curves might be able to tell us something. Maybe the car is pulling timing up top or something.
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Old 26th October 2008, 22:36   #186
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Quote:
Originally Posted by phillym5 View Post
Can you post up the dyno jet graph.....

That might help alot. Seeing the curves might be able to tell us something. Maybe the car is pulling timing up top or something.
it's not a timing issue. I've data logged the car from 30 - 140 at WOT and timing looks within spec.

I've asked the dyno shop for the dyno files and am waiting on them to be emailed to me.

Regards,

Darren
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Old 26th October 2008, 22:37   #187
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Clutch
I don't feel any clutch slippage, plus the clutch was replaced at the time of the stroker install even though the car was new.
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Old 26th October 2008, 22:42   #188
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Hmmmmm.....

Maybe you just need to refill that nitrous bottle you were using.....

Just kidding....
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Old 26th October 2008, 23:10   #189
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goodluck and hope everything works out...
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Old 26th October 2008, 23:17   #190
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Quote:
Originally Posted by darren_dallas View Post
Starting a few days after the video in the beginning of this thread I started having sluggish performance again.

I have dyno'd the car and it's very much down on power. I ran against a friend of mine in a stock SL65 and lost to him in the same manner as my modded 2006 M5 with bolt-ons.

In addition, I ran against the same stock M5 in the video at the beginning of this thread and now I'm only 1-1.5 car lengths ahead of him. Looks like I'm back to square "1" again.

I dyno'd the car last week and only put out 457 rwhp on a dynojet and the next day tried a dynodynamics with the result of only 399 rwhp.
Wow, hope that works out for you Darren. We're all pulling for you.
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