I've started to use Jet-Tech (www.rotaxjetting.com) when I'm able to take a laptop to the track. I ordered a Kestrel pocket weather station from Singapore and use that in conjunction with the jetting software.

I haven't been able to use it nearly as much as I've hoped but so far it seems like a really good program. It has inputs for all the weather parameters and you can also put in your float height, what floats you are running, what needle etc. and the program calculates what main jet and needle clip positoin you should be using.

Does anyone else have experience using jetting programs? Anyone tried any other programs besides Jet-Tech such as MaxJet?

How much did it cost you for the software and weather station.....if you can disclose this info, much oblige.

Hi Naza!

I got the jetting software in return for advertising on KartingMalaysia.com The Rotax-Only version of the software costs 80 UK Pounds, so obviously it's not very cheap.

The pocket weather station cost roughly RM1000 if I remember correctly, the exact model was "Kestrel 4000". I ordered it from Singapore because I couldn't find a Malaysian supplier. It's really compact and is supposed to be very accurate too.

The company in Singapore that had the kestrel is:
ACEZ INSTRUMENTS PTE LTD
Tel: (65) 6268 0100 (Ext.130)
http://www.acez.com.sg

im all for hi-tech gadgets for karts. but is this software justified spending 80 UK Pounds?

when i was introduce to this software 2-3years ago, i was temped to get it.
but so far im guided with oldschool plug reading method. last 2 races in macau, Olivier Marechal view plug and gave jetting # tip to use. Engines didnt miss a beat all day.

now for sure i dont have his years of experience. i just wonder how close these software are compair to the experience tuners.

only wish it was cheaper so i can buy and compair it with oldschool style.
or some geek make a web2.0 jetting site, so all we need to buy is a weather station and have internet access during the race.

If it's justified depends on the individual. If you think about it it's about the price of a set of tyres - so you can weigh the advantages of buying an extra set of tyres to practice on vs spending it on software that might help you go faster (at least more consistently).

I have one too.......from Canada and has it since 2004! ( bought it abroad ) I have the complete set up ie. weather station connected to my Palm as well.

TO be honest, for most times - it gives a 162/165......based on our weather here.

Dunno abt urs Mikko but does it sounds the same? ie. 162 mostly?

Darn, now I race a ROK!

I think the basic recommendations for the local weather is usually about 160 or 162, which is about right. Haven't had my weather station at Shah-Alam though - what's the elevation?

The Jet-Tech software actually puts a lot of emphasis on you having to calibrate the software to your engine/carb combination. It has adjusters to make the setup good for your engine combination - and it has 10 spots to remember the settings for other carbs/engines. All engines/carbs are slightly different so you absolutely have to calibrate it to your own engine - otherwise it just won't be accurate.

There are adjusters that help you fine-tune the software to your engine - this isn't just a simple +/- on the main jet, but also on the relation of the needle clip position etc... and once you've found the correct jetting once (main jet+needle clip position) you should be set!



My software (Jet-Tech Pro) does ROK as well

Thanks Mikko,

....for the info on prices.

Thanks Mikko. I think SA has elevation of abt 30m or so.

Mine has a slide adjuster too, to compensate for different track lengths and also engine variations....

we usually use 1-2 sets for practice anyway.


thats what i thought, jetting dont vary that much on a stable weather. i think it gives more advantage if the weather is green or rains.

now after doing more research on this, and since im aiming to get MyChron4, and with the latest firmware it looks like AiM lambda controller (LCU-ONE) is another alternative.
i think its more accurate tuning this way. plus we can logs the fuel ratio lap by lap too. what u guys think. cost about the same as MyChron4 kit.

http://www.aimsportsystems.com.au/lcuone_kart.html

btw, is there a AiM dealer in Malaysia?

Rock,

How does a fuel ratio help in tuning? Is there a sensor after your carby or are you measuring the EGT?

lets just say we tune race cars only by fuel ratio reading.
it read the fuel mixtures in realtime. if u have carby problems, it can see it right away etc. u can data log the reading too if urs running lean or rich etc.

not sure where the AiM sensor sit, but im guessing its ether the exhaust manifold or the exhaust itself.

not to hijack this thread, maybe when i do get this kit i open another thread for this tuning alternative.

One problem with the Lambda is it doesn't help you tune before you go onto the track - you only know when you're on the track.

The other problem is you won't be allowed to use it in any RMC race weekend - I think EGT sensor is allowed but not lambda.

Mikko is rite.....and with a fixed jet set up like Rotax or ROK, you gain only half the value of such systems.

good points guys. guess i need to do more research before i buy anything.

i think the best way is we just buy a weather station then sms Mikko for jetting settings