ESE's works engine tuner

[adegnes]

Then I would probably do as before but in sculpt environment and adjusting it whoever wishes

Good idea, thanks!
Haven't used sculpt at all yet.

[Muhr]

I wonder if somebody has tampered with TPS and 3d ignition curve and if so you notice any major improvement in throttle respons after a long throttle let off.
If it's worth the trouble.

[wobbly]

The 3D map allows you to take timing out when pulling low/med rpm with little throttle opening.
This is where the engine will deto if running up around 28* in a single curve map.
But 28* is what you want when at low/mid rpm under the pipe , when at full or near full throttle.
This gives way better throttle response.

[Muhr]

The 3D map allows you to take timing out when pulling low/med rpm with little throttle opening.
This is where the engine will deto if running up around 28* in a single curve map.
But 28* is what you want when at low/mid rpm under the pipe , when at full or near full throttle.
This gives way better throttle response.

Thank Wobbly
The thought was that it would be used for an engine with quick shift and electronic power jet. There is more an on/off throttle application with fairly long throttle let off.
So the idea was that you could clean up a little in the barrel if needed.

[wax]

The 3D map allows you to take timing out when pulling low/med rpm with little throttle opening.
This is where the engine will deto if running up around 28* in a single curve map.
But 28* is what you want when at low/mid rpm under the pipe , when at full or near full throttle.
This gives way better throttle response.

We run up to 34 degrees on the jetskis

[_____]

The 3D map allows you to take timing out when pulling low/med rpm with little throttle opening.
This is where the engine will deto if running up around 28* in a single curve map.
But 28* is what you want when at low/mid rpm under the pipe , when at full or near full throttle.
This gives way better throttle response.

Also you avoid having a "racing idlespeed". This occures while having ~30° with a single map. The engine does not fall lower than that whilst beeing hot.

[SwePatrick]

The 3D map allows you to take timing out when pulling low/med rpm with little throttle opening.
This is where the engine will deto if running up around 28* in a single curve map.
But 28* is what you want when at low/mid rpm under the pipe , when at full or near full throttle.
This gives way better throttle response.

Isn´t 28* a bold statement as every engine is unique?
Or was it just an example?

A rule of thumb in foulstroke engines is the less time to burn the more advance needed, and the less 'filled cylinder' the more advance needed.
And ofcourse vice versa on both.

This two combined creates a curve both with boosted engines as unboosted.

Wouldn´t it be the same in twostrokes?
but with one change, the more pipe the less ignition needed(like a ignitionretard on boosted foulstroke engines)

[wobbly]

The 28* was just an example, but is very advanced for any engine with a single curve map when there is the possibility of any time spent at part throttle with that timing..
Jetski engines do run well over this to get the snap throttle response, but are never run in that zone for any length of time at part throttle , and the fast acceleration rate ensures no damage occurs.
Rob had this very issue on one of the ESE bikes , where the best power advance on the dyno would deto like hell on the track in the mid range , when it wasnt accelerating quickly at full throttle.
A 3D map makes fixing this issue easy.
A 2T essentially needs an ignition " curve " the inverse of the bmep , thus as the pipe efficiency increases ( along with the PV opening if used ) the dynamic compression increases dramatically and as
has been mentioned many times , when everything is in sync at peak , then we tend to end up with 15* advance.

[Muhr]

Another thing I think might be worth mentioning as below.
very rough numbers but.

10,000 rpm and exhaust port opening time of 0.003s and 780mm pipe = 400 c °
11,000 rpm and exhaust port opening time of 0.0027s and 780mm pipe = 565 c °
12,000 rpm and exhaust port opening time of 0.0025s and 780mm pipe = 700 c °

[Muhr]

Good idea, thanks!
Haven't used sculpt at all yet.

Another way to do that, progressive radius on top.

[adegnes]

Another way to do that, progressive radius on top.

Funny - exactly what I just started playing with!

[Muhr]

Funny - exactly what I just started playing with!

You could of course project from a negative at the desired angel
works perfect! Sometimes I'm a bit stupid

[adegnes]

You could of course project from a negative at the desired angle

Clever! Thanks!

[TZ350]

Rob had this very issue on one of the ESE bikes , where the best power advance on the dyno would deto like hell on the track in the mid range , when it wasn't accelerating quickly at full throttle. A 3D map makes fixing this issue easy.

Sure did, great torque curve on the dyno. At Kaitoki Kel blasted it around the track great guns in practice and for qualifying. I was pretty sure we were going to kick arse but the engine died from detonation just trickling around the track during warm up for the main race. Had a similar problem at Taupo a couple of weeks earlier. A TPS and 3D ignition map sorted it.

[jbiplane]

I finally setup and start production of 5-axis milled cylinders.
Heads and "spiral" resonators should be ready soon.