ESE's works engine tuner

[ken seeber]

Not too sure which KTM model Daryl is looking at, but the 300 EXC TPI has no sensor of any sort on the exhaust pipe. The only "air flow" inferring sensor is a MAP sensor that is tapped into the cylinder's C port.

[Peter1962]

Happy birthday, Jan.

Nog veel gezonde jaren toegewenst.
Maak er een fijne dag van samen met je familie

[katinas]

Happy birthday Jan.

Add photo from my school days czech magazine Svet Motor, with nice little two stroke bikes from 1974 Brno GP.

[Pursang]

Not too sure which KTM model Daryl is looking at....

The seller says this is a 2019 EXC 250 TPI. Bought new for a project and not used.
Has O2 sensor & Cat Converter. Probably from a Euro model.

Cheers, Daryl

[Pursang]

TM's approach to 2T FI





From their Facebook page" https://www.facebook.com/TMRacingNed...type=3&theater

[F5 Dave]

2 head outlets. Hadn't actually seen that.

GasGas ships with a Cat pipe in some countries along with an offroad pipe. I tried one. Would hardly get out of it's own way. I wouldn't have bought it if I'd ridden it with that pipe.
They've (if picture is new ktm) gone further still with sensor and queer header.

[husaberg]

Not too sure which KTM model Daryl is looking at, but the 300 EXC TPI has no sensor of any sort on the exhaust pipe. The only "air flow" inferring sensor is a MAP sensor that is tapped into the cylinder's C port.

Parts fiche has it Ken on the Euro but not on the US model but i might have had the wrong id

its a Std KTM lambda as used on 4ts
exceedingly expensive.

[wobbly]

Always great to see pics of things you have never seen.The pipe is " designed " with virtually no diffuser effect , thus drawing very little excess
mixture from the cylinder - maybe to help with hydrocarbon emmissions .
Honda had twin head outlets years ago - to feed twin radiators , and I notice that the TM has 3 yellow wires from the alternator , obvously
they need 3 phase to get enough power to run the injection system.
And big reps to TeeZee , mate you have gone done something original and published the results , fukin awsome.
Give it a new name - like TPI or Wobbly Duct , soon everyone will be calling the new idea yours - Worldwidefamewithnopay.

[TZ350]

And big reps to TeeZee , mate you have gone done something original and published the results , fukin awsome.

Thanks Wobbly. ...... Hmmmm I nead help with a name for it. Anyone got some ideas? ....

[F5 Dave]

I did try at lunchtime but didn't get past DeltaSquirt .

[rtechracing]

I am sorry if my post ends up in the wrong topic but I am all new on this forum......
I have a 750 triple on my inertia dyno and can`t get rid of the HP/torque drop before powerband. Has anyone seen it before and have experience what can cause this? I have done more or less all in regards to jetting, altering ignition, etc.

[TZ350]

.
Certainly the right place to ask.

My guess is, that at 129 hp its not unexpected, the dip is the result of the pipe being out of phase with the engines exhaust port timing at that rpm point. It gets worse the more effective the pipe is and/or more tuned the engine is. The trick is to reduce the pipes effectiveness at the dip point, an VTEC chamber or maybe a chamber pressure bled.

Looks like an atac valve.
They are just a chamber about the same size as the engines cylinder, and a butterfly valve.
They do work on increasing low end power as long as they are mounted close to the exhaust port.
They have been used in various incariations on Honda CR NS and MVX as well as the BSL500 and Cagivas.


Suzuki and Kawasaki have also used more compicated variations of exhaust chambers.

the this is how they work
note the butterfly is mounted 90' away from how it is pictured here

This was Farmakens DIY effort (maybe not its a twin lol)

Hopefully others will explain it better. And anyway, a Kawasaki H2, I am really really jealous ......

[rtechracing]

Well, we use to do 151HP without the drop before pipe but then we were forced to change engineblock, resleeve all cylinders and do new porting. We increased ex duration slightly according to recommandation we got.....
With this new set up we have so far 141HP but still with the drop before pipe.....

[TZ350]

.

"search term" site:https://www.kiwibiker.co.nz/forums/s...-engine-tuner?

The power dip issue has been talked about on the ESE thread before. Try the google "site" option. You should be able to turn up some interesting stuff.

[rtechracing]

Thanks a lot.
Sorry, I am not sure what you mean by google "site" option? Something on the forum?