just dusted a 2009 bmw m5
09-13-2011, 01:15 PM
#16
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Every time I talked to Greg in June and July, he had Andy's transmission valve body out and apart again, doing something or other to get the thing to shift how and where he wanted it. Lots more special sauce than just a different stall TQ. Will be interesting to see whether the TT shaft or the axle shafts break first... 
09-13-2011, 01:31 PM
#17
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525 at the Crank right?
The dyno curve I posted above is one I made using Excel, as the engine dyno place just gave Greg a page of raw data. Here's the raw tabular data that I used to make the graphs. This data is from the run where Greg had his own headers installed.
09-13-2011, 01:46 PM
#18
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609 HP, at the crank. More importantly, over 500 ft lbs. through a 1,000 rpm range. Over 425 ft lbs from 3,000 to redline.
It runs good.
Standard California pump gas. Standard tune (no "hero" run done.) Exact full throttle maps and fuel that it runs, in the car.
The automatic transmission is an interesting thing. I think these transmissions are much like a "jet boat"....where increases in horsepower are lost through the mechanism.
If you're not familiar with a "jet boat", they "soak" up horsepower like a sponge. If it takes 550 horsepower to turn one at 5,000 rpms, it might take another 750 horsepower to turn it an additional 1,000 rpms.
I never bothered to go get rear wheel horsepower....didn't care. All the horsepower numbers mean nothing. How it runs is what matters.
Everything else is "bench racing".
It runs good.
Standard California pump gas. Standard tune (no "hero" run done.) Exact full throttle maps and fuel that it runs, in the car.
The automatic transmission is an interesting thing. I think these transmissions are much like a "jet boat"....where increases in horsepower are lost through the mechanism.
If you're not familiar with a "jet boat", they "soak" up horsepower like a sponge. If it takes 550 horsepower to turn one at 5,000 rpms, it might take another 750 horsepower to turn it an additional 1,000 rpms.
I never bothered to go get rear wheel horsepower....didn't care. All the horsepower numbers mean nothing. How it runs is what matters.
Everything else is "bench racing".
__________________
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
09-13-2011, 01:48 PM
#19
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09-13-2011, 02:09 PM
#21
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Right as one would expect the stock intake designed for 320-350 HP becomes very restrictive when you try to make 600 HP normally aspirated. Just not what it was designed to do but even so it makes huge amounts of torque.....huge !
09-13-2011, 02:41 PM
#22
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John:
Really can't discuss that here....way too much information.
Mike Simard made them, to a specification that Mike and I "agreed" on. Mike is very "bright" regarding this stuff.
They are his "hollow" billet cams running on very custom lifters. That's about as far as we can go, on this subject, here.
Really can't discuss that here....way too much information.
Mike Simard made them, to a specification that Mike and I "agreed" on. Mike is very "bright" regarding this stuff.
They are his "hollow" billet cams running on very custom lifters. That's about as far as we can go, on this subject, here.
09-13-2011, 02:57 PM
#23
Drifting
Thread Starter
when I asked greg about the cams thats about all I found out....I mean he gave me lift and duration but the ramp and other thing s I dont know much about allow the spring pressure to be less than you would expect.
I am still amazed at the available torque everywhere!
I am still amazed at the available torque everywhere!
09-13-2011, 03:00 PM
#24
Drifting
Thread Starter
btw I am hearing funny clunks on undulating surfaces when going slow around corners from the rear...hope it just suspension parts that have 100000 miles on them...that can be fixed...
09-13-2011, 03:58 PM
#25
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Axle noises?
They are still original....just repacked with new boots. They looked pretty good, even considering the mileage.
It's also possible that the PSD is engaging.
09-13-2011, 04:06 PM
#26
Drifting
Thread Starter
I mean slow,,,4 to 5 mph going into parking lot...consistent when the body rolls a little. I will stop flogging for a while and get it checked out. I am not too worried...already put 1800 miles on the car, kids off to college, trip south for short vacation.....smiles all the way!!!
09-13-2011, 04:10 PM
#27
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Fair enough Greg... I asssume more lift and a little more duration.
I mainly wanted to know if they were stock cams or specials.
I mainly wanted to know if they were stock cams or specials.
John:
Really can't discuss that here....way too much information.
Mike Simard made them, to a specification that Mike and I "agreed" on. Mike is very "bright" regarding this stuff.
They are his "hollow" billet cams running on very custom lifters. That's about as far as we can go, on this subject, here.
Really can't discuss that here....way too much information.
Mike Simard made them, to a specification that Mike and I "agreed" on. Mike is very "bright" regarding this stuff.
They are his "hollow" billet cams running on very custom lifters. That's about as far as we can go, on this subject, here.
09-13-2011, 05:16 PM
#28
Race Director
97 crank hp more than an E60 M5 with Devek headers, 102 hp more with GB headers. This plot was the baseline for all the subsequent tuning that Greg did so there may be a couple extra hp in there somewhere. I'm not sure whether Greg ever took the whole car over to the dyno place to see what the rwhp was.
Andy, I've been waiting for this sort of 'kill' story from you.
Andy, I've been waiting for this sort of 'kill' story from you.
Whats really sad is even at 3k Andy makes more HP than my estate does PEAK...
I'd say racing your brothers M5 is not fair....to the M5.....a better comparison would be something like a ZR1, Viper or 997TT
I'm sure Tim Dey could "help" you out with his ZR1....
...."smiles all the way!!! " Does it make sense ? Nope. Does it need too ? Nope !