ECU Map past rev cut?

[spetz]

Hi guys,

Just curious as to whether an ECU map exists after rev cut?
So for example if some noob was driving his car that rev cut is at 6,000rpm, and he accidentally shifted into the wrong gear which made the motor spin at 7,000rpm, would there be a map there for ignition, fuel etc? Or is it "blank"?

PS. Lets assume the engine stayed in one piece

[trism]

The rev cut can be either spark cut, or fuel cut, depending on ecu. Most stock ecus have a soft fuel cut, so it'll cut every 3rd injector pulse.

Aftermarket limiters like the bee*r have a hard spark cut. It'll cut every spark while still pumping fuel, hence the flames.

But you are correct in saying there is no map after the cut.

So if you mishift, the throttle body will be closed, no fuel injected, but with a dissy, still spark.
Hh

[ECU-MAN]

the active cell would be the last cell for the RPM v MAP load in the table, so on resume it will hit that cel. if the engine is revving higher, then there will be no injector pulse.

[spetz]

Well, the reason I asked is because the E-manage ultimate says that it can raise the rev limit if it is fuel cut.
And just wondering what happens when the rev limit is raised? As the e-manage is a piggyback I thought it needed a signal from the ECU to adjust, but if the rev limit is raised and there is no signal, how will it control the engine?

[ECU-MAN]

The Emanage could be tricking the ECU into thinking its just below the RPM limmiter so it can still drive the injectors when infact the RPM is above the Limmiter. The ECU will switch to the CEL that coresponds to the RPM v MAP and use that cel.

I would be more concerned about the valve train rather what cel my ECU is uning if overriding the factory limmiter.

[spetz]

But how would the ignition and injection be correct if the ECU is thinking that the engine is at lower rpm than it really is?

[ECU-MAN]

it wont be.

to do it properly you have to go Hondata, crome or Neptune ( or any other aftermarket ECU ) and add the extra colums and rows for the RPM you want to the table

[spetz]

So the advertising the the e-manage ultimate does for raising the rev limit is incorrect?
ie, it would not be a good idea to go past the factory rev cut even with the ultimate?

[ECU-MAN]

with out looking at the specs for having run a unit myself I really cant say.

you are always better off with an actual tunable ECU rather than a piggy back system.