So who wants their ECU's "Chromed"?

[jras312]

Scheduled some Dyno time at GZP last weekend of March.

Hell ya! I'll most de be in contact with you Greg, once I get ahold of a tactrix cable. Hopfully they restock soon!

[JasonY]

Im thinking a race gas only tune for NG Greg, see what we can really squeeze out of the EVO maf/stock ecu setup

Jason

[aaronatstate]

Im thinking a race gas only tune for NG Greg, see what we can really squeeze out of the EVO maf/stock ecu setup

Jason

I'm going E85 as soon as I can order up the new Walbro pump. Should be sometime this month...

[JasonY]

Nice! Has anyone pushed any real power through yet? or will you be the first to open it up on this setup?

Jason

[Greg E]

Nice! Has anyone pushed any real power through yet? or will you be the first to open it up on this setup?

Jason

E85 might work on a completely stock fuel system....

[HLxDrummer]

So is there any reason the EGR is disabled by default? I kept EGR on my car to help with combustion chamber temps and fuel economy... Any downsides to me putting a "1" in that box? I do have EVAP taken out though...

Also, for a 1G I'm guessing I'll have to disable "downstream O2s"?

[aaronatstate]

Nice! Has anyone pushed any real power through yet? or will you be the first to open it up on this setup?

Jason

Not sure. I wont being taking it all the way to the limit. Going to use the Evo560s still, with a base pressure of 55psi, so they will be basically 630s. Hoping to get about 17-18psi and lots of timing with the E85. I will also just adjust the injector scaling in my current pump gas tune, so I can run pump gas if I need to travel long distances etc.

[Greg E]

So is there any reason the EGR is disabled by default? I kept EGR on my car to help with combustion chamber temps and fuel economy... Any downsides to me putting a "1" in that box? I do have EVAP taken out though...

Also, for a 1G I'm guessing I'll have to disable "downstream O2s"?

Good catch! You should leave it disabled because you don't have the factory MDP sensor which the Flashable ECU uses to operate the EGR and you'll get a CE light. With the bit disabled, the valve will still function because it's operated by vacuum and throttle plate position, HOWEVER, there are some side effects without ECU control:

*won't be disabled during engine warm-up
*won't be disabled during light cruise
*won't be disabled above 4000 RPMs (not really sure what side effect this will cause to be honest)

If enough people want to keep their EGRs in their cars (better fuel mileage) I could set something up where the ECU could use the GM Map sensor. This would just be a matter of finding the table which the ECU uses to scale the factory MDP sensor and scale it for the GM sensor. Then it will work as it should.

I'm fairly certain there is a difference in the spring tension in EGRs between the earlier cars and the ones used in the OBD2 vehicles so a later gen EGR will need to be swapped in as well (could someone confirm this in CAPS?).

...and yes you need that bit disabled for the O2 sensors.

[aaronatstate]

I get better fuel economy with my EGR out...I've always understood EGR was used to reduce Nox emissions, not increase fuel economy. Also EGR at WOT is bad. It will reduce power. I get the same fuel economy now as I did stock.

[HLxDrummer]

Hm.. Looks like I should just delete it then to be safe. I would love to reduce the clutter, just didn't want to take functionality from the car (some websites said it helps with fuel economy/temps but who knows how accurate that it. Disabling the trims and doing a lean cruise will probably more than make up for EGR anyway, huh?

Also, should I disable the bit that has to do with EVAP? Sorry for all the questions I just want to make sure all the bits do what I'm expecting them to lol