Technically, VTEC engagement is based on manifold pressure and RPM. If you set the MAP threshold at 900 mBar with the bottom of the VTEC window at 5600 RPMs, then it might engage at 60% throttle at sea level or 95% throttle at 2000 feet above sea level. However, if you lower VTEC down to 3500 RPMs, then VTEC might engage at 25% throttle at sea level. This means that I wind up engaging VTEC very often on the highway.

BTW, the numbers I'm using above are WAGs.

 

Not for me. Fuel economy is about the same too.

 

gains can be found, even with a stock setup. You can also use flashpro for tuning part throttle leaner then stock, thus in most in cases, getting better af ratios.

If you lower vtec enough, you will be in part throttle at some rpms. For example, for my clients, i set the higher window at 5% throttle and the lower window at 90% throttle. However, as gernby said, that doesn't work all the time. This is why its essential to tune part throttle while in vtec as well (something I do for my clients)

 

Not to steal the thread, but I read an argument not long ago that an air flow controller is pretty much worthless on MAP cars (honda and acura) since the o2 sensor will negate any change we make to the car. It also said changing the VTEC engagement point will just make it run lean for a few seconds when engaging early. Obviously I trust everyone here so can someone confirm or negate this theory?

 

The EU FlashPro was recently tested by one of the UK members and MASE who tuned it. The car in question was a bone stock 2009 AP1 (We never got the 2.2) without any modifications

The end result was 10hp extra up top, with increases from midrange up and the owner with quite a big smile.

In terms of bang for buck it's probably better than having an expensive JDM header/intake/exhaust. If you already have those parts then its going to get even more out of them.

 

That's quite the improvement!

The FlashPro uses a MAP sensor for the S2000 and changes the A/F ratio quite effectively using readings form the primary O2 sensor. The ECU does not negate any changes we make to the car. Hondata knows what they are doing. The person you talked with might be thinking of this concept, which is copied from the Hondata help files:
[QUOTE=Hondata help files]Fuel Tuning
Mass Flow (AFM / MAF) vs Speed/Density (MAP)

The ECU can calculate the engine fuel requirements by two methods - mass flow (using the air flow meter) and speed/density (using the manifold pressure sensor).

 

Piggy backs like the VAFC / NEO are very effective for WOT tuning if the car comes from the factory with conservative tuning (rich AFR and retarded timing) like the '00-'03 S2000's. By using the piggy back to reduce MAP voltage to bring AFR up to a more optimum level while also advancing timing a bit, you can get impressive gains. Honda ECU's go into open loop at WOT, so the O2 sensor is ignored. You just have to make sure the piggy back is NOT making any MAP / MAF adjustnemts while the ECU is in closed loop.

 

That would be me.
My dyno - a stock 09 car ( AP1 no AP2's in Europe ) with less than 2000 miles on the clock with a Mase tune.

 

The fp has been the single best mod I have done on my car. The s runs smoother then it ever did stock. I had to put my stock program on to have work done on it at the dealer. The car felt so slugish and rough while driving it. I would buy it even if your not moded. As you add parts you will be able to keep tuning it to keep your car running at full potential and get the most out of your af parts.

 

i agree with everyone, the flashpro was the single best mod I have done to the car. It changes the dynamics of the car.