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      08-04-2018, 05:08 PM   #1
Madvillain
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Red face bms stage 1 m5 vs m4

i did a few runs last night with my brother and another friend (both f8x stage 1 cars) and the results were surprising lol....when my m5 was stock it was identical to my friends bms stage 1 m3 from 100 to 200kph. have since installed bms stage 1 on m5 and last night decided to test it against the m4 and m3. long story short the 2 of them were identical (surprise surprise) but what was shocking was they were somehow identical(or there abouts depending on who stepped on gas first) to the m5.... so what gives anyone else experience anything similar?

i have footage with gopro but its at night. i can run it again tomorrow if anyone curious about proof of this.
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      08-05-2018, 07:50 PM   #2
Pikey Motorsports
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Something not right

My stock m5 is identical to stage 2 m4 done many runs
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      08-06-2018, 10:42 PM   #3
Madvillain
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Quote:
Originally Posted by Pikey Motorsports View Post
Something not right

My stock m5 is identical to stage 2 m4 done many runs
exactly ive done that same friends m3 (bms stage 1,res delete, intake) and was identical to the m5 stock (no surprise there). but this is really weird. i did a 4th gear pull with brother in m4(bms stag 1) otw home and the m4 pulled. i contacted bms to see if the unit could be faulty but i think the culprit is the heat. i think s63tu has some serious issues with heatsoak. we have like 20-35 degree weather here so i think that plays a roll. how i came to this theory (yet to be proven) is on a fun run brother stomped on gas and i reeled him in from pre dam far back starting way later than he did. wanted to see if anyone on forum was experiencing this inconsistency with f10 m5 tuned.
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      08-13-2018, 09:32 AM   #4
TrevorM3
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Why are you doing 4th gear pulls?

I had an AA piggyback, with downpipes, had no issues handling jb4 m3's/m4's with downpipes.
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      08-14-2018, 08:31 PM   #5
ZachP51
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I'm running an ESS tune and DP and have no issue walking tune and DP M3/4. Something must be wrong.
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F10 M5//F30 328i //E92 M3 C/P (Retired)//E82 135is (Retired)//E92 335i (Retired)
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      12-20-2018, 03:28 PM   #6
Madvillain
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Quote:
Originally Posted by ZachP51 View Post
I'm running an ESS tune and DP and have no issue walking tune and DP M3/4. Something must be wrong.
clearly... lol i think it could be that clutch is otw out, so its affecting how much power is being transferred from engine to wheels. i know when i put it in reverse on incline itll jitter so obv there is no question its pre much toast but idk how much that could affect power to ground. the tune is def functioning correctly if i take it off there is def a reduction in power (really all it does is hold more boost its bms stage 1 nothing fancy). just wondering if it can be down to heavy heat soak or who knows? the m4 does sometimes feel abnormally fast though.... it is individual frozen red with individual white interior and every option and mod done to it from bmw like mpe all the carbon bs and w.e. perhaps it has comp tuned ecu and now since the bms stage 1 is on its stacked??
the inconsistency of the m5 i think is due to clutch and heat soak. Either way i wanted to hear some input from people on the forum.
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      12-21-2018, 10:08 AM   #7
Pikey Motorsports
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Does the clutch slip? And what fuel you run best thing to do is log the car see what the timing is
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      12-22-2018, 11:24 AM   #8
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You should just get rid of the bms and get a real flash tune
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      02-16-2019, 04:37 PM   #9
Madvillain
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Quote:
Originally Posted by kong24680 View Post
You should just get rid of the bms and get a real flash tune
i put it up for sale because ill be doing more power mods to the car but still an odd result that day. is bootmod3 nice and reliable as a tune? i think big issue with f10 m5 is heat soak. m3/4 def has better cooling. most liekly best option wouldbe meth to help it stay cooler.
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