Dyno run in the M4- 477bhp apparently!

Tengocity · 11-04-2018, 06:19 AM

Down at Surrey rolling road this morning with MarkG_M3CP to see what the car was doing with and without the TDI tuning box.

The run with the box on was "only" 494bhp, less than Mark's car did with the same box on.

Without the box connected though it showed a hefty 477.8bhp! So that's about 30bhp more than standard, with peak torque around 465lb/ft.

Charlie has had other M4 CPs do around 475 so not entirely unheard of, and the range is 445 to 475. Mark's as standard did 445 as standard, and bang on 460 today with the CS map.

We're not really sure what to make of it to be honest, and my first thought was whether a tuning box can have some kind of residual effect after it's been disconnected?

teaston · 11-04-2018, 06:41 AM

Wowzers!

chris-c · 11-04-2018, 07:04 AM

Generally post tuning box they take a while to get back to normal. They often run worse for a while.

Tengocity · 11-04-2018, 07:16 AM

Quote:

Originally Posted by chris-c

Generally post tuning box they take a while to get back to normal. They often run worse for a while.

So how does that work then? I wondered if this is what's happening, but if it's no longer providing the changed readings to the ECU then how can it be influencing the output?

teaston · 11-04-2018, 07:35 AM

Part of the adaptations I guess.

chris-c · 11-04-2018, 08:19 AM

Yeah the car learns parameters over time.
DMS (or dervtech) made some post about it on Facebook about certain cars giving different values shortly after having the tuning box taken off

Goneinsixtyseconds · 11-04-2018, 02:46 PM

Quote:

Originally Posted by Herr August Schmidhuber

Does the bank know you're tuning their car?

Like the bank gives a shit. Pay them, do what you want.

BMW warranty department however.........

225 · 11-04-2018, 03:02 PM

Quote:

Originally Posted by Herr August Schmidhuber

Quote:

Originally Posted by chris-c

Yeah the car learns parameters over time.
DMS (or dervtech) made some post about it on Facebook about certain cars giving different values shortly after having the tuning box taken off

Indeed. This is one of the 'finger prints' BMW look for when your car throws a rod and you think the warranty will pick up the bill.

Who gives a monkies, chances are low and smiles per mile more than make it worth while.

Very impressive and the 4 must fly!

MarkG_M5Comp · 11-04-2018, 03:39 PM

Good day actually, my results always seem to make decent sense so I'm perplexed by Tengocity's result today.

Charlie was suggesting fuelling on mine was bang on too while the M4 was being held up at the time end (with the box).

I use V-Power Ultimate or what ever it's called and Tesco 99, Tengo used standard BP.

Views?

11-04-2018, 06:19 AM	#1
Tengocity General 8567 Rep 19,982 Posts Drives: 911, Cayenne Turbo, Disco 4 Join Date: Sep 2013 Location: Crieff, Perthshire, Scotland iTrader: (0)	Dyno run in the M4- 477bhp apparently! Down at Surrey rolling road this morning with MarkG_M3CP to see what the car was doing with and without the TDI tuning box. The run with the box on was "only" 494bhp, less than Mark's car did with the same box on. Without the box connected though it showed a hefty 477.8bhp! So that's about 30bhp more than standard, with peak torque around 465lb/ft. Charlie has had other M4 CPs do around 475 so not entirely unheard of, and the range is 445 to 475. Mark's as standard did 445 as standard, and bang on 460 today with the CS map. We're not really sure what to make of it to be honest, and my first thought was whether a tuning box can have some kind of residual effect after it's been disconnected? Attached Images __________________ Current: Porsche 911 991 C4S, Porsche Cayenne Turbo, Land Rover Discovery 4. Gone...G01 X3 M40i, Cayman S 987, F31 340i, Cayman GT4, F82 M4 CP, Lotus Exige V6, G20 330e, F30 330e, Boxster S 987, F31 335d, Mini Cooper SD, E89 Z4, E90 330d 320d, E60 520d, E46 330d 320d, MX5s, E30 325i
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11-04-2018, 06:41 AM	#2
teaston Banned 10995 Rep 32,881 Posts Drives: X3 M40d Join Date: May 2012 Location: The High Seas iTrader: (1)	Wowzers!
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11-04-2018, 07:04 AM	#3
chris-c Lieutenant Colonel 901 Rep 1,801 Posts Drives: F31 340i RWD Join Date: Feb 2018 Location: Kent iTrader: (0)	Generally post tuning box they take a while to get back to normal. They often run worse for a while.
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11-04-2018, 07:35 AM	#5
teaston Banned 10995 Rep 32,881 Posts Drives: X3 M40d Join Date: May 2012 Location: The High Seas iTrader: (1)	Part of the adaptations I guess.
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11-04-2018, 08:19 AM	#6
chris-c Lieutenant Colonel 901 Rep 1,801 Posts Drives: F31 340i RWD Join Date: Feb 2018 Location: Kent iTrader: (0)	Yeah the car learns parameters over time. DMS (or dervtech) made some post about it on Facebook about certain cars giving different values shortly after having the tuning box taken off
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11-04-2018, 03:39 PM	#9
MarkG_M5Comp Supreme Being 1806 Rep 5,425 Posts Drives: M5 Comp Join Date: Jul 2013 Location: Hampshire, UK iTrader: (0)	Good day actually, my results always seem to make decent sense so I'm perplexed by Tengocity's result today. Charlie was suggesting fuelling on mine was bang on too while the M4 was being held up at the time end (with the box). I use V-Power Ultimate or what ever it's called and Tesco 99, Tengo used standard BP. Views? __________________ Current: F90 M5 Competition Gone: F80 M3 Competition Pack / M135i / F15 X5 M50d / Saab 9-5 Aero HOT / F30 335d xDrive M Sport / E92 LCI 320d M Sport / E46 320d M Sport Touring / E46 318i Touring
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