My E30 with E36M42 dyno chart

[fabianyee]

Did a dyno run on Monday to get the AFR reading in order to properly tune the SMT6... Here's the dyno chart before the SMT6 was in

Dynojet Research Inc.
Run Title: 318
Run Notes: 3RD RO
Run Date: 4/11/05 12:27:15 PM

34.89°C 1020.52mBars Humidity:31% SAE:1.00 Average Gear Ratio:44.86

__________s_________RPM_x1000_PS________Kg-M______Air/Fuel
__________1.06______3.10______51.61_____12.23_____ N/A_______
__________1.93______3.35______68.73_____14.69_____ 13.89_____
__________2.63______3.60______72.60_____14.44_____ 13.78_____
__________3.33______3.85______79.15_____14.72_____ 13.69_____
__________4.01______4.10______86.01_____15.02_____ 13.96_____
__________4.67______4.35______95.08_____15.66_____ 14.11_____
__________5.32______4.60______100.44____15.64_____ 13.89_____
__________5.99______4.85______101.73____15.02_____ 13.84_____
__________6.70______5.10______103.95____14.60_____ 14.29_____
__________7.41______5.35______108.73____14.56_____ 13.94_____
__________8.11______5.60______114.31____14.62_____ 13.81_____
__________8.83______5.85______117.66____14.40_____ 13.82_____
__________9.56______6.10______120.27____14.12_____ 13.72_____
__________10.33_____6.35______119.19____13.44_____ 13.82_____

MAX:______10.33_____6.35______120.27____15.66_____ 14.29
MIN:______1.06______3.10______51.61_____12.23_____ 13.69

Max Power : 120.32rwhp @ 6000rpm
Max torque : 15.78 Kg-M (~154.6Nm) @ 4400rpm

[gstuning]

Remember to advance the ign. also as that is the source of the power on a factory spec motor

[fabianyee]

Remember to advance the ign. also as that is the source of the power on a factory spec motor

The dealer helped me tuned it earlier this evening, the car pulls better... the top end has been advanced to 10.. what's the max to advance?

btw, it's the AFR at 14 the ideal ratio? was told that it's lean... However, that would depend when's the last time the wide band O2 sensor was replaced at that workshop.

[2002maniac]

most people tune to a low 13:1 when looking for power.

[e30Matt]

I don't know if the same applies to the M42 motors, but I know the S50s like to run a little lean in the midrange and richer up top... just what I've learned from tuning the McHenry's cars. Granted they're a little different than your average 3.0/3.2 lump.

[nickmp0wer]

is that the before or after?

[nickmp0wer]

could we get an after dyno?

[fabianyee]

will do an after dyno later.... haven't got the chance to finetune it yet.

[wazzu70]

I think 14:1 usually works well with N/A cars, and I know a lot of people like 13:1ish as well. Im used to 12:1 but thats a general guideline for blown cars. I dbe interested to see the after A/F chart.

[fabianyee]

Remap the fuel and ignition mapping today... and added in the toggle switch to switch between Map A and Map B on the fly.... ;)

Map A is moderate...
Map B is more extreme....
however, would expect fuel gauge drop faster depending how heavy is the right foot.... :(

[nickmp0wer]

what mods do you have before the smt6? was that dyno 100% stock? im looking forward to seeing the gains

[fabianyee]

what mods do you have before the smt6? was that dyno 100% stock? im looking forward to seeing the gains

what mods I have.... Let's see..

1. Lightened M40 flywheel
2. open pod air filter
3. 3.5 bar fuel pressure regulator
4. Beru Silverstone sparkplugs
5. no CAT and Sebring S-flow muffler


That's about it.....

[Streetspec_iS]

interesting fabian. def keep us posted on the follow up.

[fabianyee]

still doing some trial and error mapping on my own... engine seems to pull better when it's leaner at the top from 4600rpm onwards...

so more fuel doesn't mean more power....

put in more fuel at the low RPM for more torque... initially, i dialled in a little to much fuel engine seem to choke on fuel.... :) but I lean it a bit and it seem fine now...

Ideally it shud be done on dyno, but it doesn't come cheap and dyno doesn't reflect part throttle gains, only WOT gains... anyway, will definitely go for another dyno to see how the 2 mappings perform....

[nickmp0wer]

have a dyno yet?