ESE's works engine tuner

[TZ350]

Below are some pictures of a stinger slide on O2 sensor for small engines.

Lohring Miller

Attachment 332927 Attachment 332928 Attachment 332926

Hi Lohring, that is a very interesting setup.



Here is a picture of where I placed my O2 sensor, the position at the back of the convergent cone was suggested to me by Wobbly, seems to work well. The blue hose is an experimental pressure take off for the EFI system.

[diesel62]

Very definitely. If you monitor the exhaust return pulse, you can see whether it arrives at the exhaust port too soon, too late or just in time, and then you can adjust the ignition timing accordingly. No need for rpm-throttle-advance tables anymore; not even a need for exhaust gas temperature measurement anymore.

Hi I'm just trying to process why the EGT would not be required any more. I understand that the temp is changed by timing. But fuel will still change the EGT and as I'm writing this I'm thinking O2 sensor is fitted so fueling is known!

Sent from my SM-G900F using Tapatalk

[wobbly]

In my opinion getting to 60Hp would have been done long ago.
Here is the potential of simply changing the Ex duct exit and spigot geometry,from Neels code.
The pipe geometry of the last designs were not so good, and Jan had to do the big radius on the timing edge just to get the top end power back.
Using a better pipe would have not needed this change to the duct Cd, and again my opinion ( this is a 2T after all ) would be that alot better combination
of timing/Cd and pipe could be found

[2T Institute]

Just by a Ryger and get 60hp

[wobbly]

Man arent we dumb,of course, who needs a whole lot of hard work to get 60 from the Aprilia.
Ryger has already done it, and some, with dyno printouts to prove us doubting wankers completely wrong.

[RomeuPT]

Man arent we dumb,of course, who needs a whole lot of hard work to get 60 from the Aprilia.
Ryger has already done it, and some, with dyno printouts to prove us doubting wankers completely wrong.

Wasnt that a scam?

what is this?

[wobbly]

Not a "real " dyno printout - another Luc wet dream.

Romeau you cannot swap the gears as you are saying.
All gears are designed as pairs to maintain the correct shaft center and diametrical pitch ratio.
Take the 23/24 gears from 5th and reverse them ie 24/23 in 6th gear position.

[RomeuPT]

Not a "real " dyno printout - another Luc wet dream.

Romeau you cannot swap the gears as you are saying.
All gears are designed as pairs to maintain the correct shaft center and diametrical pitch ratio.
Take the 23/24 gears from 5th and reverse them ie 24/23 in 6th gear position.

That was what I thought first, but that won't fit at all, the 22 of 6th gear has the shift fork guide, and there is no 23 sproket equal in the gearbox. that way only If I order a personalized gear.

[jamathi]

Man arent we dumb,of course, who needs a whole lot of hard work to get 60 from the Aprilia.
Ryger has already done it, and some, with dyno printouts to prove us doubting wankers completely wrong.

After having been 2.5 sec a lap slower than a Tm on a 35 sec a lap track they are finally silent.
Their power was estimated at about 33HP
Not something to be proud of.....

[jamathi]

It's wonderfull how it still achieved so much.
It looks like the Aprilia team had considerable restricitions and disagreement between yourselfs and the "boss".
Always had a thought that this dellorto used in the Aprilia would be better then keihin and read at pit lane that it wasn't exacly that way.

Was any component from the Aprilia made in Japan or other place besides Europe?

What would had happen in your opinion if the 125 2t was still at GP, do you think it would have achieved 60cv by now after more 6 years of R&D?

Piston rings and big-end cages came from Japan, also the spark plugs.
I think we would have achieved 60HP by now.

[katinas]

Jan, when you rise EX window bottom on Aprilia cylinder, do you change angle of A transfers side wall near exhaust?

[jamathi]

Jan, when you rise EX window bottom on Aprilia cylinder, do you change angle of A transfers side wall near exhaust?

No, I couldn't, they were already as much rearward inclined as possible.

[adegnes]

Been trying to find info on CVT efficiency, here's the best paper I've found so far.
https://www.google.no/url?sa=t&sourc...G3eMIDFLS5CN4S

With estimated 20% total transmission loss I have to lower efficiency in my engmod simulations to 0.79 for them to match real life dyno results. It doesn't seem right.



Blue/green = dyno run
Red/black = simulated
Yellow/pink = simulation ported engine but same pipe

Either transmission loss is higher than 20%, or my engine is very inefficient...

Had a minor blowup...

[SwePatrick]

After a dynopull.
How hot were the pulleys for the belt?

Really hot = a lot of loss
Almost no heat at all = your engine isn´t producing power.

Well, that is a really harsch statement, but it can guide you to what´s correct in your research =)

[adegnes]

After a dynopull.
How hot were the pulleys for the belt?

Really hot = a lot of loss
Almost no heat at all = your engine isn´t producing power.

Well, that is a really harsch statement, but it can guide you to what´s correct in your research =)

They're hot, really hot. One pull and you can't touch them.
On the 17.4whp pull there even was smoke coming from the belt around peak power...

So, on the plus side I am probably making good power, on the minus side the CVT is probably very inefficient.