Chip Tuning for the SDRIVE35I

[B21]

Originally Posted by Y888

from mhd site:


"Stage 1 (up to 360HP/520NM) - 91oct/95ron, 93oct/98ron, 95oct/102ron, for stock cars.
Stage 1+ (up to 390HP/600NM) - 91oct/95ron, 93oct/98ron, 95oct/102ron, FMIC recommended.
Stage 2 (up to 380HP/560NM) - 91oct/95ron, 93oct/98ron, 95oct/102ron, high-flow downpipes recommended.
Stage 2+ (up to 420HP/650NM) - 91oct/95ron, 93oct/98ron, 95oct/102ron, high-flow downpipes + FMIC recommended.
Ethanol Mix Maps: Stage 1, 1+, 2 and 2+ E30+ Maps for ethanol blends of 30%+"

Ah…so no actual measurement…..note the ‘upto’…

I misread your stage tune ..I thought it was 1+

You notice that their stage 2 with more hardware produces less power than their stage 1+?

What fuel are you using?

[Y888]

Yea thats a little weird but probably there is a reason for it,i use pump gas 95ron

[B21]

Originally Posted by Y888

Yea thats a little weird but probably there is a reason for it,i use pump gas 95ron

Well on 95 Ron on stage 1 more like 345-350 crank BHP I suspect

Looks like their stage 1 is more like a 35is type flash..

I used 98 Ron on mhd stage 1+,2,2+ on v9 then v10

All baseline and tested on the same dyno..

[Y888]

im waiting for my intercooler to arrive then ill instal dp and ic both and do the dyno test

[B21]

Originally Posted by Y888

im waiting for my intercooler to arrive then ill instal dp and ic both and do the dyno test

Would be really good to dyno test it stock before tweaking it..otherwise you have no real correlation as to the true nature of the tweaks…fwiw

That’s what I have done for both my E89s..

[KennyP]

98RON is definitely the way to go. At first i also started with the milder fuel and map. But soon upped it to a 98ron tune. Feels stronger, more agressive on 98ron. Theres definitely a difference between different fuels and their maps. I have been on 98RON for years now. Wont put anything else in the tank.

Also look at your back to back accelerations... first few may be strong but then it would weaken due to heatsoak. Intercooler surely fixed that. With uprated intercooler you will have a more consistant performance.
You will surely notice it on a track session. Put your mhd gauges up and monitor your intake air temp while driving.

This is from Cobb website.. stock vs 91oct(95ron) vs 93oct(98ron).


So you are leaving some performance unused when on 95RON fuel and map.

[Y888]

i ranked 12th out of 20 not bad for a first time lol,yes i felt the heat soak,from now on im doing 2-3 hot laps and 1 cooling laps because oil temp also skyrockets

[B21]

Originally Posted by KennyP

98RON is definitely the way to go. At first i also started with the milder fuel and map. But soon upped it to a 98ron tune. Feels stronger, more agressive on 98ron. Theres definitely a difference between different fuels and their maps. I have been on 98RON for years now. Wont put anything else in the tank.

Also look at your back to back accelerations... first few may be strong but then it would weaken due to heatsoak. Intercooler surely fixed that. With uprated intercooler you will have a more consistant performance.
You will surely notice it on a track session. Put your mhd gauges up and monitor your intake air temp while driving.

This is from Cobb website.. stock vs 91oct(95ron) vs 93oct(98ron).


So you are leaving some performance unused when on 95RON fuel and map.

I'd guess 20-30 bhp 95 vs 98 on a good tune on a n54?

[Bob20124]

Actual before and after Dyno plots on Cobb from 10+ yrs ago. measured at the wheels.

[KennyP]

Originally Posted by Bob20124

Actual before and after Dyno plots on Cobb from 10+ yrs ago. measured at the wheels.

This is basically the map im using at the moment... That "aggressive" means its a 93oct/ 98RON map. ST means standard throttle ( There is linear option aswell) and stage 1+ is for uprated intercooler. This is a bit older map though... There have been some updates to cobb maps since then... they stopped naming their maps as aggressive and now name them by the fuel they are meant for. Bit better to understand.
So stage 1+ aggressive is now after minor updates named as just stage1+ 93oct/98ron map.
Though i have those older "aggressive" named maps still stored on my accessport for just in case.

[Y888]

if you set the map for 100 oct and u use 93 can u screw it up?
i heard if you set ethanol map and use regular fuel you can say goodbye to your engine

[KennyP]

I wouldnt test this... if requirements are not met then dont try it..
That said... i have seen people try stage 1+ maps without intercooler... still risky business imo...

[B21]

Originally Posted by Y888

if you set the map for 100 oct and u use 93 can u screw it up?
i heard if you set ethanol map and use regular fuel you can say goodbye to your engine

You’re relying very very heavily on the knock sensors to save the engine from destruction..

Like jumping out if a plane hundreds of times without a back up parachute…