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E60 M5 and E61 M5 Touring Discussion 2005- Advertiser's Forum

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post #11 of 15 Old 19th December 2017, 04:47 AM
DRMCEO
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post #12 of 15 Old 22nd December 2017, 03:28 AM Thread Starter
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Headers are installed picked the up last week. I wanted to drive it a while to get a feel of the car. Slight change in the tone of the exhaust sharper is how I would describe it just a little more rasp out side no real change inside. Put abut 120 miles on it over the weekend. With miles the tone begin to change a little smoother closer to stock. Performance got better the more I drove it better response to the throttle in aii modes.

Took the car to frank smith to have a custom dyno tune on Tues. Frank tells me that a strong m5 puts down 380 to 390 on his dyno mine put down 411. After the tune the car kept getting stronger 430,433,437,440.
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post #13 of 15 Old 22nd December 2017, 03:53 AM Thread Starter
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Got back late tues was dead tired so I got up next day went for a ride. Oh s__t this thing pull a ton holiday traffic around town so I couldn't do a long pull. Went to bap geon picked up new air filters I ordered and put them in. Dam this thing running even better. Went by the shop to talk to my guy pulled out on broad st. and punch it "dam" broke traction all the way through 1st bang 2nd gear broke traction till I let up.
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post #14 of 15 Old 22nd December 2017, 05:16 AM
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post #15 of 15 Old 27th January 2018, 06:36 AM Thread Starter
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Just an update with the m5 I've been having some issues with low fuel pressure under load and high rpm. Checked codes bad high pressure fuel pump. Replaced fuel pumps, fuel pressure switch, and mass airs.

Took the car back to frank smith weds night @ retuned it. It was running lean up top. We got fueling back to normal 12.7, 12.8. Before it put down 439 to the wheels. Last night it did 475.7 hp @ 378.8 ft/lbs to the wheels. On frank's dyno that's 570 hp @ 453 ft/lbs. at the crank not bad. He said after the ecu adapts should pick up another 10 hp or so. ?
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