F23A5 feels like vtec, non linear powerband

[Mike's_Taffeta]

I know this engine doesn't have vtec, but around 4500 rpm the engine picks up more then it does below 4500 rpm. I have had cars with vtec such as my acura tl, the tlp engine vtec was around 4k rpm and the tls engine was around 5800 rpm.

I was under the impression that most naturally aspirated engines had a linear powerband rather then say that of engine with variable valve timing or forced induction.

So either have an issue below 4500 rpm or something wonderful is happening at 4500+ either way I am able to beat my friends scion tc with headers intake and exhaust manual trans. (I don't typicallly street race, but this was on the airport property where I work and its an industrial airport, not much traffic)

Has anyone else experienced this?

 

[Sketch o5]

its called your max torque.

Max torque: 153 ft·lbf (206 Nm) @ 4500 rpm

http://en.wikipedia.org/wiki/Honda_F_engine#F23A5




although, i dont really understand how you notice it since its such a small amount, haha.

and about that tc stuff, i think its more of a case that your friend just cant drive. they weigh about the same, maybe even a little less, and have more power. that or your friend must be really fat haha.

 

[Mike's_Taffeta]

Weight was taken into consideration, mine weighs 2800 his weighs 3100, he's not fat but maybe weighs 20 pounds more then me.

And I don't think its max torque, yes max torque is at 4500 but then it falls of and horsepower takes over, but considering max hp is 135 at above 6k I don't see how it could be that either.

 

[Drift]

I remember that feeling when I had that engine in my car. Reset the ecu and beat the crap out of it and you'll have gotten rid of that "step up" in power for a few weeks until the ecu re-learns the fuel trims.

That step is the A/F being super lean at first, and then going into open loop and fattening up a bit.

 

[Mike's_Taffeta]

Fattening up the fuel trims would cause it to be slower wouldn't it? Unless the fuel trims are somthing like 16:1 then fatten up stoich (14.7:1) ill try the ecu reset (haven't done it on this car, but I'm assuming its pulling the clock fuse, or disconnecting the battery?)

 

[Drift]

Fattening up the fuel trims would cause it to be slower wouldn't it? Unless the fuel trims are somthing like 16:1 then fatten up stoich (14.7:1) ill try the ecu reset (haven't done it on this car, but I'm assuming its pulling the clock fuse, or disconnecting the battery?)

Dont believe the "leaner is meaner" mantra. Its not always the case.

Just pull the clock/backup fuse for a minute to reset the ecu.

 

[Mike's_Taffeta]

Theoretically its true, extreme lean conditions are good for gas mileage at part throttle, however at wot will make a mess, but that's a discussion for another day. Ill reset the ecu and see what happens, thanks.

 

[Drift]

Theoretically its true, extreme lean conditions are good for gas mileage at part throttle, however at wot will make a mess, but that's a discussion for another day. Ill reset the ecu and see what happens, thanks.

Yeah, I work at a tuner shop and my best friend is a ecu recalibration specialist, I'd rather not get into this discussion right now.

 

[Mike's_Taffeta]

Lol making a post about your job and your friends technical experience are a little off topic, but boasting is cool too. We can pm if you'd like, or exchange numbers for more discussion

 

[HondaLuver83]

Yeah, I work at a tuner shop and my best friend is a ecu recalibration specialist, I'd rather not get into this discussion right now.

Why not? You're probably sick and tired of talking about it since it's your job.