[Madgambler]

Hi,

For those considering an ECU mod this is my thread on Hartge's unit, now installed on my M135i ZF8HP.


BEFORE - 340 S_HP / 360 fFtLb (BMW Official 320 HP / 330 FtLb) - At the wheels 282 HP

Had the Rolling Road results in on my factory fresh M Hatch and things are already looking good: the actual numbers are significantly higher than the conservative BMW figures before I even start to modify it, with 340 HP being the headline figure of note.

Peak Torque @ 2750 of 360 ft/lb is effin' sweet and those Michelin Pilot Super Sports are handling it well.

Not an expert on Air-to-Fuel stuff but the all important 14.7:1 stochiometric ratio (yes, I googled it) is attained for a healthy chunk of graph 2 I think - at least the meatier rev range anyway.

Was getting about 33.5 mpg with an average speed of around 42mph, doing about 150 miles per day. 2 full tanks per week of Shell V-Power (99 RON here in the UK).


AFTER (now with M Exhaust) - 375 S_HP / 400 fFtLb - At the wheels 312 HP

The impact on the Comfort setting is subdued but noticeable, which is exactly what I wanted. When starting from cold I definitely noticed an extra bit of pull with the choke on, which wasn't too worrying - I've had to deal with much, much worse with my Alpinas in the past, particularly the B3s which was a savage roaring beast in winter with its monstrous steel exhaust.

Cold start up still occasionally iffy. Could be a fuel pump gremlin.

Overall in the Comfort setting the word 'sharper' springs to mind. I'm not putting this entirely down to the gearbox adapting to my driving style all over again (since the battery was disconnected), because it was still feeling that way after an hour's worth of mixed traffic and motorway driving. The throttle response is flatter and more progressive with extra bite in the lower revs. Definitely even more torque than before.

The new results show an increase of 40 FtLb in places and peak now is hovering around the 400 mark, that's up from 330 according to the stock figures (360 from my first session), although the increase tapers off above 5000 revs. Interestingly the peak Torque has now shifted to about 3750.

HP increase with the M Xorst is now more than I expected. Took another Rolling Road session to bring it out in numbers so the comparison isn't exactly fair, but I don't think the 361 figure was quite right. This new result feels more accurate.

Sport mode and 'S' gear option is where the car really shows the extra ponies at work. It was always rapid but now it feels epic.

The ZF box manages the hurry up with the gear selection flawlessly.

Legendary speed for such a little car. At full blast the open diff is now struggling to cope though. Looks like an LSD might be inevitable.

The new torque figures show how the Hartge mod has ramped up the power earlier and steeper than stock, which explains the difference pretty well.

Fuel consumption appears to have increased slightly. Now hovering around the 32.5 mark, down 1 mpg.

The addition of the M Exhaust has punched it up yet another notch. Less boomy than the stock item on gear changes, it seems quieter on Comfort, unless blipped, but absolutely howls on Sport and Sport+

[DECVING]

Sorry for my ignorance but can you explain the three graphs?

[ovekvam]

First one seems to show power and torque estimated on the flywheel.
The second one shows the air/fuel ratio, and the third one shows the actual measured power (and computed torque) on the wheels.

[DECVING]

Thanks! Would be good to see before and after. Performance wise, how do you feel 0-100 (or 0-62 in yur world) has improved?

[Madgambler]

I'll be sure to post the AFTER results next week.

Mod being done on Monday

[Active]

Originally Posted by Madgambler

I'll be sure to post the AFTER results next week.

Mod being done on Monday

Looking forward to seeing the after results. Had my Hartge tune done about a month ago and had the Bastuck exhaust installed yesterday!”

[Madgambler]

Did you measure the bhp gain?

I hear that in Comfort mode it doesn't do much unless you have a heavy foot, whereas in Sport it's a bit more aggressive.

[ovekvam]

Originally Posted by Madgambler

Did you measure the bhp gain?

I hear that in Comfort mode it doesn't do much unless you have a heavy foot, whereas in Sport it's a bit more aggressive.

Notice that when you dyno the car, you need to use DTC Off, and thus only measure the Comfort mapping.

Maybe you can use Sport+ on an AWD dyno.

[Madgambler]

DTC was off for this set of figures and it was in Sport+ mode.

Didn't need to tell the tester either, he already knew about the setting.

This despite their rig only being set up to roll the rear wheels alone.

[ovekvam]

Originally Posted by Madgambler

DTC was off for this set of figures and it was in Sport+ mode.

Didn't need to tell the tester either, he already knew about the setting.

This despite their rig only being set up to roll the rear wheels alone.

In Sport+ Mode, DTC is ON. To run only the rear wheels only, you need DSC/DTC Off. In this case, the car will automagically select Comfort Mapping, unfortunately.

[Madgambler]

Automagically...like it. Ah well, I suppose it doesn't really matter since what I'm trying to gauge is some estimation of the net difference. As long as the next set of HP and Torque numbers are bigger I won't feel like I've wasted my money and as long as the car doesn't start guzzling fuel I won't feel like I've ruined it.

[Active]

Originally Posted by Madgambler

Did you measure the bhp gain?

I hear that in Comfort mode it doesn't do much unless you have a heavy foot, whereas in Sport it's a bit more aggressive.

yep, its all about the sport mode! After fitting the Bastuck exhaust, it sounds and feels crap in comfort, however in sport the performance improvements are sensational! Will have to get some tweaks done to sort out comfort mode.

[Madgambler]

Edited: Added AFTER - Dyno results

[Madgambler]

Edited: New figures with BMW M Performance exhaust: 375 HP...

Details and charts to follow.

[hwelvaar]

Originally Posted by Madgambler

Edited: New figures with BMW M Performance exhaust: 375 HP...

Details and charts to follow.

Sounds promising...

[hwelvaar]

Originally Posted by ovekvam

Notice that when you dyno the car, you need to use DTC Off, and thus only measure the Comfort mapping.

Maybe you can use Sport+ on an AWD dyno.

I suppose you mean DSC/DTC off, all systems for traction aid off? ( http://www.e90post.com/forums/showpo...49&postcount=2 )

Can you please explain why ?

[ovekvam]

Originally Posted by hwelvaar

I suppose you mean DSC/DTC off, all systems for traction aid off? ( http://www.e90post.com/forums/showpo...49&postcount=2 )

Can you please explain why ?

If you have the front wheels standing on the ground on the dyno, you need to run DSC/DTC Off. The issues is that you have to use Comfort engine mapping in this case.

If all four wheels are on the dyno, you could perhaps use Sport+ if you can avoid wheelspin in tall gears. That way you can test the Sport engine mapping.

[PeterPure]

Did you dyno at same place as the other runs? 15 hp from just exhaust seems a lot to me. Anyways i am pretty sure it will drive nicely now with the added vitamines :-)

[hwelvaar]

Originally Posted by ovekvam

If you have the front wheels standing on the ground on the dyno, you need to run DSC/DTC Off.

I understand if you have an X-drive, but for S-drive ?

[ovekvam]

Originally Posted by hwelvaar

I understand if you have an X-drive, but for S-drive ?

The thing is that the car will not accept that the rear wheels are spinning fast while the front wheels are stationary unless the traction control is switched off.

On the AWD dynos, the rollers are spinning together, so the rear wheels will make the front wheels go too, even on S-drive cars. If you avoid spinning on the rollers, the traction control should not be protesting.

[hwelvaar]

Originally Posted by ovekvam

The thing is that the car will not accept that the rear wheels are spinning fast while the front wheels are stationary unless the traction control is switched off.

OK got it now. Didn't know that.

[hwelvaar]

The new graphs seem to be from a different dyno ?
That maybe explains the different numbers compared to the previous test...