palantirion

-Because I have three scanners - and none of them work for one reason or another. No matter, I can use my digital camera clean it up in Pshop. Might be tomorrow before I have time though, got a lot going on right now...

p.s. Palantirion (long story, going back to college) is from Tolkien's Sylvan Elf language and it basically means "far-seer", or "one that looks to the long way". The full name is actually Palantirion Dur-wen Vagoroth. "Far Seer" "Lover of Women" "Those that strike from the shadows". A friend and I have been using the House Vagoroth name for online gaming since 1999, but the clan is between games at the moment.

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olis1

Olis means "Lover of women and fast cars".

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Dinan Engineer

Hi
In an earlier past you said there was fuel dripping from the exhaust. Assuming that the car still has cats this would be highly unusual; I would be very suspicious that it was actually water. In fact with cats we have never seen that and frankly if it were that rich we would be amazed it would be running. If it really is fuel than it is your problem , no question.

The effect of ambient temp as a rough rule is 1% for every 7 deg F so that wouldn’t explain it.

1)How much heat there is in the motor/cooling system when the pull is started can changer the power dramatically

2)We install a stand alone Air/Fuel meter and drive it on the street.

3)Here is where I begin to get suspicious, what work was performed at the body shop? If the MPG calc went that far off at that time. Is it just the MPG of the on board computer or did the mileage actually change also? If so you would have to believe that something broke/put together wrong. By virtue of the fact that the MPG (calc or actual) changed so dramatically there must be some problem. After all the MPG calculation are based on injector duty cycle time, fuel injector size, fuel pressure… At a minimum the electronics went a little nutty, you have to fix what you know is wrong before looking for new faults.

4)Does it have overdrive? If it were in overdrive then the HP would come out correct but the TRQ would be low HP

HP = (TRQ * RPM)/5252
Where HP = horse power, TRQ = torque in Ft*Lb and RPM = revolutions per minute

So 320= (TRQ*5500)/5252 therefor TRQ = 382

If it were in overdrive of .8
320 = (TRQ*(5500/.8))/5252 therefore TRQ =244
These numbers line up pretty closely with what you got.
Cheers

Jon@TheMShop

On a dynojet, that VF SC 540i made 322rwhp.

Did anyone recall the A/F ratio Roadwarrior's SC 540i got?

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EM5PWR

looks like a BBS convention to me ...

palantirion

-Now I wish I had bothered to smell it The car had been driven to the shop, then sat for an hour, hour and a half before dynoing. Maybe some condensation could have formed?

-Right.

-It had been siting for 1-1.5 hours. It was warmed, but not hot.

-So there's no hidden diagnostic code in the M5's ECU? I thought somewhere there was once posted a code used for checking if you MAFs were clean that showed a/f.

-They replaced the front PS fender, both PS doors, repaired the PS rear quarter, and painted appropriate pieces. I also had them do the hood since it was cheap to do at the time. My mileage is still the same, just the counter is off. Any idea on what (physically) could have been effected by the above repairs? Chris ( I assume you know him and BMS) cleared about 40 console faults and one "unrealistic air temperature" fault on Friday, the day before the Dyno Day.

-It's an M5, so yes. I don't know what gear they ran it in, but it was within 1 second of Olis1's time to spin under load (I checked the tape). I don't know if that time would change depending on gear used though. When I take it back I'll certainly be keeping more detailed notes.

-That's an interesting formula. So is the TQ number on a Dyno only accurate if you are in a 1:1 gear? And the HP gets corrected by measuring the wheel rpm?
-If I did the math right...If my S2 was actually generating 290lb-ft at the wheels in 6th gear (0.83:1) at 5200rpm, then it was actually making 349lb-ft at the flywheel in 5th (1:1). 70lb-ft short of advertised, 19 less than stock.

Thanks for your detailed response Paul. I hope we can sort this out

olis1

[/quote]
-That's an interesting formula. So is the TQ number on a Dyno only accurate if you are in a 1:1 gear? And the HP gets corrected by measuring the wheel rpm?
-If I did the math right...If my S2 was actually generating 290lb-ft at the wheels in 6th gear (0.83:1) at 5200rpm, then it was actually making 349lb-ft at the flywheel in 5th (1:1). 70lb-ft short of advertised, 19 less than stock.

Thanks for your detailed response Paul. I hope we can sort this out [/quote]

I'm pretty sure the torque isn't calculated like that. The dyno measures engine rpm and wheel rpm and from that makes the gear conversion so it doesn't matter what gear you are in (I think if I understand it right - someone correct me if I'm wrong).

You may want to read some of the earlier posts in this thread as we were discussion how they measure torque on a dyno without inputing the gear and ratios, etc.

By the way, they ran my car in 3rd gear and my guess is yours was the same.

Jon

Dinan Engineer

olis1
thats a good point, let me talk to a few of the guys here who have a lot of experance with the dyno and get back on this.

Do you have a scan of the 540iT dyno run?

mottati

couple of thoughts...
1. water is a byproduct of combustion, so i'd bet water was what you saw coming out of the exhaust, not fuel (unless there was fire spitting out of the pipes as well!).

2. I'd highly doubt a dyno run in 6th gear. Dyno's have an upper rpm limit, and even in 5th, you're talking 150+mph dyno speed. This is why many dyno in 4th, 3rd just seems too low. You're going to have significantly more frictional losses in 3rd vs 5th, so that could account for a reduction in the numbers (as far as i understand dynos).

Still likely fault/adaptation issues going on since you had them cleared the day before.
Mike

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BKH

I'm going to give the shop a call next week and set up a time to take my car in during the month of Sept. If anyone who missed this wants to come also and catch lunch also, PM me. I'm REALLY interested to see how my ride matches up on the same dyno.

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