Custom Map vs. Autotune

V8M3 · 04-30-2011, 07:29 PM

This Tuesday, I am dynoing my bike to see where I am at with mods. A custom tune at the shop is $250. If you have the Autotune, would it do just the same as a custom map over time, or should I get a custom map and let the Autotune keep doing its thing?

Running PCV + Autotune.

Sextaafondo · 05-01-2011, 01:58 PM

Well, the autotune will give you the best "custom map" for your bike and mods. Is the perfect tool. BTW, you need to accept the changes to your existing map for the autotune corrections to take effect.
The other consideration is to what AFR you are targeting the autotune. You may search the best output power AFR on the dyno, and then use the autotune in real world riding, along the entire throttle range and rpms, to set a map for that target.

V8M3 · 05-02-2011, 07:40 PM

Well tomorrow I am doing the dyno. I will get an opinion from the technician. Thanks Sextaafondo for your input. I will probably just dyno to see where the bike is and then think about a custom map if I get poor results. I will post results in a new thread tomorrow evening.

**BIOHAZARDCYCLES** · 05-03-2011, 03:29 PM

If you have the auto tune you shouldnt need the dyno tune..
Would be cool to see if they are close though..

V8M3 · 05-03-2011, 03:52 PM

Quote:

Originally Posted by BIOHAZARDCYCLES

If you have the auto tune you shouldnt need the dyno tune..
Would be cool to see if they are close though..

I did do the dyno today and the technician made some corrections to the PCV and Autotune which bumped HP 8.87 at rear wheel. The bike is still fairly new, so I am going to ride for a couple of 1000 miles and he is going to check where we are at on the dyno again. I will post the dyno chart when I get home later today.

Definitely could feel the difference response wise!

Nigel · 05-03-2011, 04:10 PM

Quote:

Originally Posted by V8M3

I did do the dyno today and the technician made some corrections to the PCV and Autotune which bumped HP 8.87 at rear wheel. The bike is still fairly new, so I am going to ride for a couple of 1000 miles and he is going to check where we are at on the dyno again. I will post the dyno chart when I get home later today.

Definitely could feel the difference response wise!

The problem with that is that you do not know what af the tuner eventually set in. Your AT will go back to the original target. You need to understand the af created on the dyno and set that as a target.

N.

V8M3 · 05-03-2011, 04:45 PM

Quote:

Originally Posted by Nigel

The problem with that is that you do not know what af the tuner eventually set in. Your AT will go back to the original target. You need to understand the af created on the dyno and set that as a target.

N.

He changed ratio from between 13.2 and 13.8. He settled in at 13.6 for best numbers. I will post the dyno chart when I get home. He explained to me what he was doing, but he felt that the Autotune would do its own thing as well especially in the low end.

Nigel · 05-03-2011, 05:30 PM

Quote:

Originally Posted by V8M3

He changed ratio from between 13.2 and 13.8. He settled in at 13.6 for best numbers. I will post the dyno chart when I get home. He explained to me what he was doing, but he felt that the Autotune would do its own thing as well especially in the low end.

Yes, understood. But was the map he did on the PC equivilant to the 13.X he set as a target? I doubt it. When I say the AT will go back to the original target, I mean to the one set as the target (old or chaged value) and not to the map values where it made max hp on the dyno. I would prefer to regularly check HP from different targets with maps being adjusted by the AT. That way when it makes good powr your map is set for the target AF. I know everyone can't do this but I don't see how else.

N.

Zug · 05-03-2011, 05:49 PM

So if I understand this correctly, I can pay $200.00 for the auto tune that will give me just about the same map as a $250.00 technician dyno tune.

Sextaafondo · 05-03-2011, 06:15 PM

The only drawback is the autotune is highly susceptible to get fouled by exhaust leaks (fresh air entering) and will tend to enrich the AFR. The secondary air injection to the exhaust has to be blocked off as well.
Also the engine will partially suck fresh air from the pipe outlet at low revs fouling the lambda sensor reading and thus the AT adjustments, so it's not good at low revs.