ECMlink 1g timing map low end lack of power

[enriquez2000]

I had loaded the evo 8 timing map onto my 1g and in comparison to the stock 1g map it was drastically reducing timing all over but specifically the 750 to 3500 rpm range has been real doggy with the evo 8 map. The upper rpms seem fine with little to no knock as it sits. I was wondering if swapping the timing out in the 3500 and below would give me a bit more pep in my step so to speak...

 

[donniekak]

A lot of it depends on your compression ratio, cams, fuel used, and turbo.

I would review some logs, and use cell tracing to see what load cells you're usually at at low rpm, and bump the time up a little at a time.

If this is an auto car, the torque converter makes a huge difference.

 

[curt-s]

Exactly. The Evo 8 has different piston design, intake, exhaust, cams, turbo, the list goes on. The timing map was built for those components with that particular VE. Missing that mark (proper timing to obtain peak cylinder pressure) either too early or too late, you're going to gain nothing or be worse overall. Experiment and do the math. Timing and spool also trade-offs. Horrid timing before 3500 and I was still at 12psi but it felt like a N/A.

It's a shame we can't do on-the-fly timing adjustments.. tuning is such a starter killer

Just remember to even out the adjacent cells and try to keep jumps between them as small as possible. Too much of a change in timing also has a negative effect and can create knock.

But you also probably see now why timing takes a dip of a degree or two around spool-up.

 

[enriquez2000]

A lot of it depends on your compression ratio, cams, fuel used, and turbo.

I would review some logs, and use cell tracing to see what load cells you're usually at at low rpm, and bump the time up a little at a time.

If this is an auto car, the torque converter makes a huge difference.

The evo 8 map has timing way lower across the board on low end. Lots of negative values. And yes i know stock converter is part of the issue but there is amost zero power until boost starts to come on.

 

[donniekak]

Take a log and use the map trace feature to see exactly what load cells you are in. The negative low rpm cells in the evo map are positive pressure cells.

If you are running stock 1g compression, or close, just replace the values in the cells you are using in the low rpm, low load range with values from the 1g timing map. Then interpolate those values into the cells around them. The values in the 2000 rpm/30psi range are irrelevant, you'll never get close to them.

 

[donniekak]

A simple restall of the stock converter will make an amazing difference. You'll go directly to an rpm the engine makes boost at anytime you press the pedal. This is if you are running the 16g.

 

[enriquez2000]

A simple restall of the stock converter will make an amazing difference. You'll go directly to an rpm the engine makes boost at anytime you press the pedal. This is if you are running the 16g.

yes I am running the 16g.. I have a spare converter I thought about restalling to 4k.. but im not sure about the driveability.. i commute with the car daily

 

[enriquez2000]

Take a log and use the map trace feature to see exactly what load cells you are in. The negative low rpm cells in the evo map are positive pressure cells.

If you are running stock 1g compression, or close, just replace the values in the cells you are using in the low rpm, low load range with values from the 1g timing map. Then interpolate those values into the cells around them. The values in the 2000 rpm/30psi range are irrelevant, you'll never get close to them.

this is what im about to load into my ecu in about 20min for the drive home. basically 3500 and below is stock 1g map and everything from there up is evo 8 with some values changed to smooth out the timing gaps. It will all change when I finish up the e85 swap over. I have to run 10 to 1 right now even on evo 8 map at high boost(23psi is my max then settles to 20).

 

[donniekak]

A restalled converter makes the car more driveable, if done properly.

A larger turbo, with a stock stall feels like your taking off in 2nd gear in a manual from a stop, waiting for the engine to rev high enough to make power.

A restall ups the Rpms, and makes it feel like your taking off in first, as a comparison.