[mhbrownie]

Got my 2020 M8 Comp Coupe dyno tested (dyno jet) earlier this week. The car is stock with the exception of the carbahn Stage 2 hardware and Stage 3 DME flash (not piggyback):

https://carbahn.com/product/cbf9x-91...mpetition-pkg/

I had 92 octane pump gas in it.

HP: 647.63 at 6170 rpm
Lb: 667.85 at 3570 rpm

The guy running the tests has issues with updates to the dyno jet software so still waiting on better pics of other runs. I believe these were the two best though.

[TheGreatM8]

Originally Posted by mhbrownie

Got my 2020 M8 Comp Coupe dyno tested (dyno jet) earlier this week. The car is stock with the exception of the carbahn Stage 2 hardware and Stage 3 DME flash (not piggyback):

https://carbahn.com/product/cbf9x-91...mpetition-pkg/

I had 92 octane pump gas in it.

HP: 647.63 at 6170 rpm
Lb: 667.85 at 3570 rpm

The guy running the tests has issues with updates to the dyno jet software so still waiting on better pics of other runs. I believe these were the two best though.

Thanks for sharing. 647 is respectable!

[Tenac]

I would be expecting a lot more than those numbers with a DME flash tune, just to be honest.

[mhbrownie]

Originally Posted by Tenac

I would be expecting a lot more than those numbers with a DME flash tune, just to be honest.

It isn't too far off from carbahn published numbers for 93 octane (675/638) (Hp/lb). Not sure why I got more torque (less Hp I would expect). I am sure their numbers are corrected as well where as mine are not.

[Tenac]

Originally Posted by mhbrownie

It isn't too far off from carbahn published numbers for 93 octane (675/638) (Hp/lb). Not sure why I got more torque (less Hp I would expect). I am sure their numbers are corrected as well where as mine are not.

Other tuners that bench tune or flash are reporting higher numbers with stage 1 and 2.

https://dmetuning.com/products/bmw-m8-2021

[mhbrownie]

Originally Posted by Tenac

Other tuners that bench tune or flash are reporting higher numbers with stage 1 and 2.

https://dmetuning.com/products/bmw-m8-2021

Those aren't at the wheel tho right? Those look like crank numbers.

[Tenac]

Originally Posted by mhbrownie

Those aren't at the wheel tho right? Those look like crank numbers.

It doesn't say other than dyno results.

[mhbrownie]

Originally Posted by Tenac

It doesn't say other than dyno results.

Since it quotes the crank stock HP and then the increase to that (160) to 760 number is almost 100% crank not wheel HP (since that is always the highest number). The fact they don't clarify that is also pretty suspect.

Read up on the carbahn tune and their approach (not pushing the engine and mechanicals past where they should be pushed and offering a manufacturer match warranty) and the carbahn was the best/safest choice for me.

[Tenac]

Originally Posted by mhbrownie

Since it quotes the crank stock HP and then the increase to that (160) to 760 number is almost 100% crank not wheel HP (since that is always the highest number). The fact they don't clarify that is also pretty suspect.

Read up on the carbahn tune and their approach (not pushing the engine and mechanicals past where they should be pushed and offering a manufacturer match warranty) and the carbahn was the best/safest choice for me.

I think they all say not to push past where they should be lol.... I will call them up tomorrow since you said its a flash tune. Is your ECM one of the locked models during 2020 year?

[mhbrownie]

Originally Posted by Tenac

I think they all say not to push past where they should be lol.... I will call them up tomorrow since you said its a flash tune. Is your ECM one of the locked models during 2020 year?

It is not locked (or if it was locked they could unlock it?) Bmw Seattle did the carbahn work.

[Justao]

Originally Posted by mhbrownie

It isn't too far off from carbahn published numbers for 93 octane (675/638) (Hp/lb). Not sure why I got more torque (less Hp I would expect). I am sure their numbers are corrected as well where as mine are not.

So M8 stock 619hp is at crank right? So 640whp is ~800+hp?

[mhbrownie]

Originally Posted by Justao

So M8 stock 619hp is at crank right? So 640whp is ~800+hp?

Yes that is a reasonable expectation

[Tenac]

Originally Posted by mhbrownie

It is not locked (or if it was locked they could unlock it?) Bmw Seattle did the carbahn work.

Yeah just got back from them they still do not do anything with the new ECM's sadly....

[meadowsdb]

Originally Posted by mhbrownie

Yes that is a reasonable expectation

Especially on an AWD Dyno.

[Vic55]

Looks promising-- I love to see dyno numbers but always know there are conditions, operators, and hardware behind it all.

I like to say- lets see where the rubber meets the road and get some draggy times in as that will show the street gains which are the most important!!

Dating myself here but my heavily modded E55K back in the day used to dyno lower than other modded ones but at the track, it always took care of business. But again it was built on a Sunday

[Tethys]

The question is did they do a before and after dyno? That is the only way you'll know anything. I would be slightly disappointed with a tuned M8 only putting down 640 but that is just me, people have dynoed these cars right at 600 to the wheels stock. Every dyno reads different though, which is why I said they should have done a before and after dyno to show you what you picked up.

[mhbrownie]

Originally Posted by Tethys

The question is did they do a before and after dyno? That is the only way you'll know anything. I would be slightly disappointed with a tuned M8 only putting down 640 but that is just me, people have dynoed these cars right at 600 to the wheels stock. Every dyno reads different though, which is why I said they should have done a before and after dyno to show you what you picked up.

I would have liked to do a before and after but the dyno options are pretty limited where I live and I couldn't get it in before I had the mods made. I would question any dyno that shows 600 to the wheels though but at the end of the day I know the car is a lot faster. Of course "a lot" is hard to quantify . In the spring after I have new tires and monoblock wheels on I will definitely be getting some 0-60 draggy times.

[Tethys]

Originally Posted by mhbrownie

I would have liked to do a before and after but the dyno options are pretty limited where I live and I couldn't get it in before I had the mods made. I would question any dyno that shows 600 to the wheels though but at the end of the day I know the car is a lot faster. Of course "a lot" is hard to quantify . In the spring after I have new tires and monoblock wheels on I will definitely be getting some 0-60 draggy times.

Dragy times will definitely show what has happened. Try and get a 60-130 because it takes traction out of it and shows actual horsepower. I have some 60-130 times in my stock M8 Comp we can compare it to and then we'll know.

[Vic55]

Originally Posted by mhbrownie

I would have liked to do a before and after but the dyno options are pretty limited where I live and I couldn't get it in before I had the mods made. I would question any dyno that shows 600 to the wheels though but at the end of the day I know the car is a lot faster. Of course "a lot" is hard to quantify . In the spring after I have new tires and monoblock wheels on I will definitely be getting some 0-60 draggy times.

getting the rollers too --- I should have been more elaborate in my post about draggy times in general.

Im sure with that whp you will get some spin from a dig.

[Dr Thrillride]

Originally Posted by mhbrownie

Got my 2020 M8 Comp Coupe dyno tested (dyno jet) earlier this week. The car is stock with the exception of the carbahn Stage 2 hardware and Stage 3 DME flash (not piggyback):

https://carbahn.com/product/cbf9x-91...mpetition-pkg/

I had 92 octane pump gas in it.

HP: 647.63 at 6170 rpm
Lb: 667.85 at 3570 rpm

The guy running the tests has issues with updates to the dyno jet software so still waiting on better pics of other runs. I believe these were the two best though.

So this is their flash because your 2020 is not locked and you’ve got the intercoolers and heat exchangers. Do you have the map sensors too?

I’m one behind you with no flash and no map sensors.

I did before and after dyno at stage 1 (stage 1 controller and intercoolers) plus Eventuri and EVS secondary cats.

Posted here. https://f92.bimmerpost.com/forums/sh...3&postcount=44

Stage 1 gave me 19 HP. $/HP pretty pathetic, but happy to have enhanced low temp cooling when running the car hard.

Stage 2 controller is installed but no dyno as I needed to pickup car for track day. Azz-dyno didn’t reveal anything. Will do dyno next spring. Hopefully flash tune is ready by then.

[Tethys]

Originally Posted by Dr Thrillride

So this is their flash because your 2020 is not locked and you’ve got the intercoolers and heat exchangers. Do you have the map sensors too?

I’m one behind you with no flash and no map sensors.

I did before and after dyno at stage 1 (stage 1 controller and intercoolers) plus Eventuri and EVS secondary cats.

Posted here. https://f92.bimmerpost.com/forums/sh...3&postcount=44

Stage 1 gave me 19 HP. $/HP pretty pathetic, but happy to have enhanced low temp cooling when running the car hard.

Stage 2 controller is installed but no dyno as I needed to pickup car for track day. Azz-dyno didn’t reveal anything. Will do dyno next spring. Hopefully flash tune is ready by then.

So all 3 of your first runs were with intakes, intercoolers and downpipes? And all 3 of the second set was with the Carbahn handheld tuner plus the mods?

[Dr Thrillride]

Originally Posted by Tethys

So all 3 of your first runs were with intakes, intercoolers and downpipes? And all 3 of the second set was with the Carbahn handheld tuner plus the mods?

Correct