I just got my car back last night from my tuner. They had a new of way of tuning with AEM and they wanted to do my S.

All I can say is holy shit. I idle dead steady at 1g. The butt dyno is going yeah is this smooth... I can't find anything I don't like...and I liked the way my car ran before.... but 3rd gear scratch doubled

I don't know much more about it other than it works really well....thanks Jared if you read this....URA*

fltsfshr

 

That was very informative... thank you very much

 

I think he's talking about boost comp. It is supposed to be incredibly easy to tune. Supposedly, once you tune for flat a/f ratio at any RPM at WOT the ems can virtually perfectly control fuel everywhere else.

Tim

 

more info? What exactly is the AEM doing and is this the new EMS or the old one?

 

I think that's a pretty good description.

This is the best tune I've had. at all rpm levels. The high idle problem is gone...the a/f stays perfect all the time. The powerband is extremely smooth and very strong.

fltsfshr

 

It's a method of tuning that will work with virtually any newer version (.9x+ i believe) of the EMS software.

You're basically tuning off the theory that the engine uses 100% more fuel at 100kpa than 0kpa, 100% more fuel than 100kpa at 200kpa, etc..

Instead of having a 3d fuel map (rpm vs. load vs. fuel) you create a "flat" 2d fuel map where the fuel value is the same for a given rpm regardless of load. This map will essentially end up representing the volumetric efficiency of the engine. You then use the boost compensation table to add 100% at 100kpa compared to 0kpa, 100% more at 200kpa compared to 100kpa, etc.

The EMS uses the boost comp table to scale the now 2d fuel map for given load values.

Make sense?

~matt

 

^ This is good stuff.

 

[QUOTE=msaskin,Oct 2 2004, 08:20 AM] It's a method of tuning that will work with virtually any newer version (.9x+ i believe) of the EMS software.

You're basically tuning off the theory that the engine uses 100% more fuel at 100kpa than 0kpa, 100% more fuel than 100kpa at 200kpa, etc..

Instead of having a 3d fuel map (rpm vs. load vs. fuel) you create a "flat" 2d fuel map where the fuel value is the same for a given rpm regardless of load.

 

yes they upgraded my software to accomodate the tune....regarding idle.. it is the best it's ever been even....no fluctuation at all.... rock solid. The whole power band is that way..

It will be interesting to see what it does on the dyno, hopefully I"ll get up there next week and get a run in.

This tune seems to have solved every issue I've had with the ems and 550 inj

fltsfshr

 

I've been meaning to try this myself. My idle is perfect even with 650's, but I keep hoping for more consistant fueling at WOT. The a/f ratio really seems to vary based on which gear I'm in. In low gears, I get 12.5:1. In high gears, I get 11.5:1! If I lean it out any then it's too lean in first gear and I start getting some random knock... I'm very happy with everything else though. I'm getting 25+ mpg and it's smooth and strong everywhere, but I keep hearing that even a basic boost comp map is MUCH better than even the most developed conventional maps. Boost comp is also what Torquefreaks uses to tune.

Tim