ESE's works engine tuner

[chrisc]

http://youtu.be/EmnsXTMLzCE

[TZ350]

Kel gave me a hand with the bike last night. Kel ran the bike, I played with the laptop adjusting the EFI tables.

Interestingly it would start a run nicely on the dyno then after a few blips of the throttle under load it would start hunting badly and would not go much over 8,000 rpm.

The motor ran better really rich but as the fueling was decreased to something more normal it would run worse. But switching the fuel pump off momentarily cleaned things up.

I am starting to suspect the timing and or duration of the injection pulse could be a problem. It is injecting into the transfer duct and the transfers are open for about 130 degrees and the maximum injector on time I have seen is about 10 ms.

I will have to sit down an figure out what 10ms at 8,000rpm means in degrees and also find out if these injectors are good for 200 Hz (12,000 rpm).

[chrisc]

I'm killing time at a training session in Sydney and found this:

http://rmdmotors.com/bikes-for-sale/

I might end up trolling through the rest of this ESE thread too

[F5 Dave]

Yeah I struggled to get past the YZR500, but ohh lookie at all those NF4s sitting around not being raced. Seems a shame.

[chrisc]

Better turn them into buckets

[Ocean1]

[husaberg]

its all wrong what were they thinking........ it needs wire spoked wheels

[Yow Ling]

Kel gave me a hand with the bike last night. Kel ran the bike, I played with the laptop adjusting the EFI tables.

Interestingly it would start a run nicely on the dyno then after a few blips of the throttle under load it would start hunting badly and would not go much over 8,000 rpm.

The motor ran better really rich but as the fueling was decreased to something more normal it would run worse. But switching the fuel pump off momentarily cleaned things up.

I am starting to suspect the timing and or duration of the injection pulse could be a problem. It is injecting into the transfer duct and the transfers are open for about 130 degrees and the maximum injector on time I have seen is about 10 ms.

I will have to sit down an figure out what 10ms at 8,000rpm means in degrees and also find out if these injectors are good for 200 Hz (12,000 rpm).

Theres a few things to think about, What is the dwell time on the injector? I mean how long from the time you energise the coil till the pintle lifts off the seat, on a big 350 you have way more time to inject the fuel. I wouldnt be suprised if 5- 7ms was wasted before any fuel flowed.

Is the injector just squirting fuel onto the outside of the sleeve and running down into the CCase, in a diesel the fuel can wait on the back of the valve in a cloud before being sucked in.

Is the injector spray pattern correctfor squirting into a very short but tall cavity, in a diesel its the opposite a long tunnel with a low roof.

I wonder if you put the injector facing into the throttle body some of these issues would solve themselves. of course some of the old problems you had may return

Just thinking !

[husaberg]

Theres a few things to think about, What is the dwell time on the injector? I mean how long from the time you energise the coil till the pintle lifts off the seat, on a big 350 you have way more time to inject the fuel. I wouldnt be suprised if 5- 7ms was wasted before any fuel flowed.

Is the injector just squirting fuel onto the outside of the sleeve and running down into the CCase, in a diesel the fuel can wait on the back of the valve in a cloud before being sucked in.

Is the injector spray pattern correctfor squirting into a very short but tall cavity, in a diesel its the opposite a long tunnel with a low roof.

I wonder if you put the injector facing into the throttle body some of these issues would solve themselves. of course some of the old problems you had may return

Just thinking !

My muse.....
Cagiva ran huge pressure... what pressure does Neil run?

[Yow Ling]

My muse
Cagiva ran huge pressure... what pressure does Neil run?

most efis run around 40 psi (in cars) I would assume that is what he would run

[TZ350]

Is the injector just squirting fuel onto the outside of the sleeve and running down into the CCase, in a diesel the fuel can wait on the back of the valve in a cloud before being sucked in.

Tim gave me a hand tonight, we started to make progress when we moved the injection end point. I think we originaly had the injector squirting into closed ports.



A lot more to do yet, but making progress.

[Mental Trousers]

Fritz sent these through a couple of weeks ago but it's taken some time to get them up.

http://kiwibiker.co.nz/images/DKW-Ja...-carbs-CRP.zip
http://kiwibiker.co.nz/images/Honda-Suzuki-Yamahai.zip
http://kiwibiker.co.nz/images/Jamath...i-Kreidler.zip

[husaberg]

Thanks MentalAnd Frits

[Flettner]

Yes between 42 and 45 psi, depending on the chamber pressure. Timing is critical.
Injecting into the inlet port is no good on a twostroke, that is where everyone else EFIing twostrokes goes wrong! It Doesn't work.
I had no problems up to 9000 RPM ( getting injectors energised and get fuel moving, on ethanol too )

[bucketracer]

A lot more to do yet, but making progress.

Hi TeeZee, I am following this with interest.



Great to see this coming together.



The first EFI graph at 22 hp starts of better than tonight's one but great to see the extra range, very promising.



So no doubt some fueling adjustments will improve tonights curve.

28+ hp, this is starting to get exciting.