thanks for the clarification

 

I will see if we can dig up some dynosheets.

 

Thank you very much.

Although a good topic for another thread, part of the intent of my questioning is how to safely tune around the MR's limitations in max tq of approximately 350 crank ft/lbs as per the manufacturer of the unit. That figure is about 285-310 awtq depending on dyno. With ECUflash software, you can adjust boost and various other tables to keep tq supressed in the lower rpm ranges (below 4,000) and then increase them later on in the upper ranges to gain max hp. Can the Zchip also modify the tq in the lower rpm ranges without affecting the upper rpm power? With multiple tables available as we are discussing elsewhere, maybe this is a possibility. It is also possible that if you don't drive your car WOT below 4000rpm, then you won't have to worry about limiting tq output at all. Many people will break this rule of course, but for those who won't and only want max power at a road course, it might not matter, especially if you only drive the car in manual mode where there appears to be less slipping between gear changes (only my assumption in practical observations).

 

Lets not confuse actual torque ratings before the unit breaks to the torque limitations of the SST ECU. They are a bit different.

Here is the dynosheet from the first quick tune on the car that Mitsubishi let us run tests on. We did not have the car for long and boost level was NOT changed from stock.


We have since been able to bump some boost and retune for additional gains as we also do with the Ralliart 2009.

 

is that first little bump where u suppressed it or is that slippage? Thank you for posting a sheet for the ralliart as close the the MR as we have seen. Also what do you think you will get, hp and tq wise, with the MR vs the ralliart? Same hp and tq or more in the evo?

 

Ralliarts have similar mapping to the MR. Their mapping isn't better persay, however their boost level is lower so it puts them at a leaner AFR without misfires as the the Evo X's have.

I would estimate with additional boost, the MR should be able to add about 60whp or so. We are currently working with +40whp on the Ralliarts with even higher gains in torque.

The more 4b11's we are able to custom tune, the better our basemapping becomes for the ZChip community. Many times we post dynotested mapping on the ZChip.net website so that users can try other maps, learn mapping styles and tips as well as change octane fuels.

Here is a pic of the MR we tested off the showroom floor.

 

Thanks for the graph. Very useful to see what you are getting with the Zchip.

Are the torque limitations of the SST ECU lower than the max torque rating of the transmission, and if so do you know where they kick in?

It seems that many people are OK and are having no problems with +-300awhp in the SST. The question becomes how far with any tuning method (we will stick on topic within this thread to the Zchip) can push the envelope before either the torque limitations of the ECU or the transmission can't take it. This is somewhat unchartered territory as most have the GSR that are making significant mods and it appears that most MR owners in general make less modifications to an already good out of the box product.

 

Its an interesting question because in testing we are using one gear to make pulls where the SST transmission can more easily be overridden by protection, whereas if left in a shifting mode, the limits are more difficult to run into.

We have begun to insure thorough testing is done on each SST vehicle not only in one gear pulls, but also full out SST runs on the dyno.

Not quite as violent as this video, however you get the idea.

 

I'm an X MR owner. I'm very new to the tuning game, still at the very beginning of understanding, so please be gentle. (I am a professional engineer (EE), though, so I do have a little engineering background...)

The one question that I have about tuning the MR is:

The SST shift points are programmed in the SST software to match up to the stock engine performance. If you start changing engine performance in the MR (boost comes on earlier, etc.), won't that negatively affect how the SST performs? In other words, the shift points are optimized for stock performance, and if you change stock performance, won't that screw up the way the SST works?

Thanks in advance for the help,
--michael

 

We have not noticed any issues with shifting on SST transmission equipped 4b11t's we have tuned.

Tuned customers have reported that the standard shift mode will feel like sport mode however as the car has more power and revs faster.