I know the ECU mapping for the built engine & TT setup is usually done with a F con pro v or Utec.. But IF it's possible to easily alter and remap the stock ECU, would you use the stock ECU for mapping? Will it be safe? I know turbonetics ST kit does this already, but what I want to know is will it be safe to remap ECU without using the full standalone or piggyback EMS for the built engine & TT setup?

My buddy's shop is now fully capable of remapping the stock ECU. I don't know the specifics, but my buddy told me they broke all the encryptions, so they can put in any mappings they want into the stock ECU. Obviously, they can remove , raise the limit as well.. They just built a rotrex supercharged G35 coupe for their demo vehicle and mapped it on the stock ECU.
Any inputs will be appreciated.

 

Whoa. I wanna hear more about this.

 

Many people have done that by using reflush.Also, it is possible to tune the stock ECU. However, it would be risky and much harder to control the setup. Anyway, if you're going FI don't even think about tuning the stock ECU.

 

It is doable but your tune would not be based on boost but rather RPM, which is OK but you would only be able to run one boost level and make sure it does not vary from that. Doable but not preferred method.

 

superchargers pretty much make the same boost every time. so if you mapped it on the safe side, it would work.


with a turbo, it can be done but for safety reasons , you would have to set it up really rich so if it got cold outside it wouldnt lean out.

all the engine management systems are boost dependant, so it references how much boost and gives figures accordingly.


you would be just hoping it wasnt overboosting if you had a reprogrammed ecu

 

I know Technosquare tuned stock block Greddy cars made really decent power back in the day, and they had 6, 7, 8 psi tunes, now a days with more tuning options we dont see many going that route anymore, especially on a built motor. I wouldnt do it on a built block Greddy TT as that would easily be 500whp and I wouldnt want the stock ECU controlling my motor at that point.

 

If you use the proper MAF sensor it will be fine. Uprev has found a way to use a different MAF sensor in a larger housing so that it will meter more air. By changing the offsets for the MAF in ecu for it. The stock maf pegs out at 5 volts with 6psi.

 

I've been using an ECU flash along with a SAFCII and MSD booster pump with my vortech setup and it works fine, but if I was running a turbo or ANY sort of built engine that big money was spent on, I'd run something like a UTEC or Fcon.

Strangely when we hooked up a scanner to the OBDII port, it wasn't showing the MAF sensor maxed out at back when I was hitting 9 psi. I'm at a higher boost level now (around 12psi) but haven't checked the MAF's voltage. The thing is though, that the SAFCII adjusts the MAF voltage before it actually reaches the ECU, so the ECU doesn't run into a ceiling as far as how much it can adjust for. The flash's fuel mapping basically takes care of the rest along with the SAFCII. The flash has to be in the right ballpark of your setup. My ECU is flashed for my bigger injectors and the car runs noticably smoother than having a piggyback scale them up.

The timing map is set with the ECU flash and the boost is controlled with the belt. So boost is consistent and in direct relation to the engine load since the supercharger works directly off of the crank. There isn't any variable delay/lag before boost comes on so the tuning process is simpler. It's just a matter of adjusting the A/F to be good with the SAFCII while maintaining a decent fuel pressure with the booster pump and balancing the two to zero in on the tune

The booster pump and SAFCII are just band-aids though. If I could tune the ECU on the dyno and the MAF wouldn't max out, I'd ditch the SAFCII. The MSD booster pump is simply there to compensate for what we think is a leak in my fuel pump assembly.

Something like the Cobb Tuning ECU OBDII port tuning software would probably run very well....if/when it comes out

 

look for software from COBB that I've heard will be capable of this, my tuner saw it @ sema..

 

Cool~ Thanks for the inputs.. Seems like ECU mapping isn't a good idea with turbo, and boost dependent mapping is more reliable...

The extra short block I purchased is with Sam at GT Motorsports for the stage 0 build. I might be steppin' up to TT and ditch the ST.
F con pro V seems to be the way to go then... Only problem is that because I'm in South Korea and there aren't any reputable F con tuners in korea... I might have to invite a japanese tuner... That's gonna cost me a lot of $$$

 

technosquare ecu reflash, new injectors, and new maf house has my z running great with 1+ bar of boost.

just goes to show what you can do with just stock ecu...