the problem is necessacarly cold start, just starting in general. if you goto the start template and watch Stat Sync'd when you crank.. you will notice it takes a few cranks for that to goto ON. the way the ems works there is no firing untill that turns on. if you see it go on and the car still takes a min to crank then its in your tuning. the car should fire as soon as that goes ON. it just takes a while to sync.

 

I dynoed 302 whp 310ft lbs with turboback and Dynoflash..how much is aem ems liek $1400????? Dynoflash is $400

 

was that on a 4 wheel dyno?

can we see your dyno sheet?

if so then good job, but this car still has the cat and needs some more tuning. we ran out of time on the dyno. and i got 5 bux that says the ems equiped car gets better mileage than ur car

 

If the car was dynoed at http://www.pruvenperformance.com/dyno.html
they have an AWDyno.

http://www.pruvenperformance.com/movies/lancerdyno1.mpg

 

I'm confused now, are you useing other than stock sensors? If you are using stock sensors, and the stock ECU starts on the first turn of the key then the issue is with the AEM EMS, not with the sensors.

I am asking because I just ordered the EMS from Buschur Racing and I already have the small battery kit. The small battery starts the car just fine now, but it doesn't have the largest "reserve capacity" by any streatch of the imagination and extensive cranking to get the car started may be a concern.

Thanks,

Keith

 

if i had to guess i would assume that the stock ecu cranked the engine in a "batch" fire mode. it fires all 4 cylinders at the same time. the ems dosnt do this, it does inject a shot of fuel at the first sign of rpms, but dosnt start ignition untill it syncs.

 

I wonder if EMS could do a "start mode batch fire" before switching to true sequential fire?

Things that make you go "hmmmm"

Keith

 

it does do a batch fire of the fuel injectors at the first sign of rpm, but dosnt start firing until it sync's

 

It isn't a big deal really. It does take noticeably longer to start, but we're only talking an additonal 1-2 seconds not like you have to run the starter forever.

The EMS does batch fire the injectors, but not until it is synched up. The EMS has a longer sensor calibration step than the stock ECU, so that is why it takes 3-4 complete engine revolutions to start up instead of the 1-2 that the stock ECU requires.

Also, the EMS has a fuel pump priming process, so you can greatly shorten the time it takes to start up the engine, if you turn the key to ON, then wait about 4 seconds and you will hear the fuel pump come on and then go off, then you can hit the Starter and it will start up in about 3 seconds of cranking. If you just hit the starter immediately you have to crank it for what seems like a long time.

I think once you have everything tuned right and the car runs better than the stock ECU, gets better gas mileage, and the power is more consistent, you will forget all about the extra 1-2 seconds for it to start up.

 

Yes it is noticeable at first, but it is not annoying. After a little while driving it you don't notice it any more. It won't drain your battery or anything like that.

 

Cool. I also drive my GF's WRX and you pretty much need to let the fuel pump prime the system before trying to start that car stock...so I am used to that idea and it sounds like it speeds up the starting process with the EMS.

Thanks,

Keith

 

Hey Wadizzi where did you mount the Aem Ems unit in a Evo 8? Can you hide it under the center counsel? I was looking at some pics and people seem to have the unit expose laying on the passenger side floor. I'm looking to purchase a Aem ems but want it to be hidden out of site. Is this possible?

 

it fits in the factory location, takes a little work to make room for the serial cable to be able to stay on so we dont have to take it in and out.. but it fits

 

I know this does not pertain to what has been talked about here but I will be putting in an EMS in late february into a very heavily modified EVO and want to let everyone know to look for it..... Also any suggestions would be nice..... i have heard only good things about it and cant wait for motor to be finished.....

 

About the stat sync, is the issue with the cam angle sensor being a logic type? RE: The CAS has a long tooth and a short tooth..... it takes a few revolutions for the EMS to "figure out" which is the long and which is the short...... then it says, "I know what is going on", and can phase ignition correctly. Here is the rub....... the car uses a waste spark anyway, so proper phasing for the igniton is not important for the spark at startup, who cares if it is firing 1 or 4, they do the same thing. (wastespark) But the CAS also phases injection right? So you could be injecting into cyl. 1 when you should be injecting in 4.....

So my question is, is there anyway to "force" or "trick" the AEM into starting ignition using the leading edge of the CAS, then sync it later after it has figured out which tooth is which? GM does this on most of their newer ECU's.

Carl Crawford