'Turbo' in MiniMax

Ihor Bilyy · Posted: Tue Aug 03, 2010 10:09 am Post subject:

Jim, can you explain your theory? here you have 2 different turbo laps (9 and 10) against non-turbo lap 6. Drop in RPM after turbo is not inability to handle it, but inability to finish pass on top of Fanchio turn in Monticello.

jim rogero · Posted: Tue Aug 03, 2010 10:43 am Post subject:

Ihor , imo, you got turbo....but , when you did was there enough fuel to supply the "need"?
Keep digging....You may wanta get an ex. temp sensor in a used pipe to help in testing.

Angus, It wouldn't matter what you chose to "race". The only difference in turbo in mini max VS jr is , how long, how early, and when would it best help in lap times.
The only form of racing that may stand the chance of "being equal" ( with out hard work and testing) may be soap box racing. And even in soap box racing I bet they use some trick wheel bearing lube and maybe special car wax, after testing.

jim rogero · Posted: Tue Aug 03, 2010 10:53 am Post subject:

Michael Maurini · Posted: Tue Aug 03, 2010 11:18 am Post subject:

Hey Jim....

Don't give away all your secrets! Lol

"Harry Gant" or "17" or "MM" may get upset..... (Inside Joke)
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jim rogero · Posted: Tue Aug 03, 2010 11:25 am Post subject:

Ihor Bilyy · Posted: Tue Aug 03, 2010 11:49 am Post subject:

Jim, I'm not asking you how to get turbo, I'm just saying the fact that it is exists will eventually ruin the class.
I remember few years ago it was not an issues, there was nobody passing like crazy out of nowhere. You have to have very good driver to make a noticeable change in lap time, but even a less experienced driver can make a pass and it is not easy to pass back in Mini.

angus hunt · Posted: Tue Aug 03, 2010 12:02 pm Post subject:

ihor, you need to go to work with ron from Engine Services. he's got it figured out, but you and him will have to do some engine testing getting your motor right ($). or better yet, just come to jrs with us!
like jim said, it's very important the time it takes in building rpm's. that's the big difference in a 'minimax' motor compared to a stock one. our really good one jumps 100 rpm's in fractions of a second after 12000 rpm's. and remember what i showed you (from what i learned from OGP)at new castle with it on the stand. you gotta get that jump almost instantly or your jetting isn't right.
jim, i haven't heard that before about turbo in jrs, but if so, then ihor and i are totally wrong. if that's the case, then it's just part of it, just like learning to tune the chassis. but i was under the impression it was only a minimax thing, and others who i assumed know have supported that thought. and with jrs not being fixed gears, i wouldn't think it would make such a huge difference. but i'll be the first to say i don't know much. hope to meet you at the track some time, jim and see the kids race, richie (angus' dad)
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jim rogero · Posted: Tue Aug 03, 2010 12:08 pm Post subject:

Tony Tesoro · Posted: Tue Aug 03, 2010 1:52 pm Post subject:

I dont normally comment on any topics but since work is very slow at work due to no snow birds in fl, which doesnt do well for the car business and this topic or question has been around for years. i would have to agree with jim, turbo has alot to do with what the kart does coming out of the corner especially at 103rd st. even watching the video that ihor posted you can see when he exits the bowl properly without feathering the throttle the kart makes big gains on the kart in front of him. i think the phrase goes loose is fast if im not mistaking Question

Michael Maurini · Posted: Tue Aug 03, 2010 1:58 pm Post subject:

Getting turbo in a Mini Max is an "art" so to speak....But it is like riding a bike, once you get it and understand how you got it, you should be able to hit it at every track.

I didn't read through all the posts but in the junior ranks, you do have turbo at a certain point. If you can get it or not is another question. It happens between 12200 and 12500 RPM....Where the ignition curves change. Have your jetting of slightly and you won't get over that mark and if you do, it won't feel like any speed gained.

If you go and look at some of the junior races from the Florida Winter Tour that are online, you will be able to see the juniors that get turbo. You will also be able to see the guy that gets it first and clean as he is usually leading.

It is hard to out drive someone in a Rotax.....You need to out tune them.

Back to working on the Yamaha "Turbo" now....
_________________
Mike Maurini
317.270.8723
Mike@RaceTechDevelopment.com
www.RaceTechDevelopment.com
_______________________________________
My opinions and thoughts are my own, and are not shared by any organizations or companies that I may be associated with.

Tony Tesoro · Posted: Tue Aug 03, 2010 2:35 pm Post subject:

Very well put but you forgot to add the magical rotax pixie dust...In stock no waiting...

Rick Sweeting · Posted: Tue Aug 03, 2010 3:44 pm Post subject:

Mark Spikes · Posted: Tue Aug 03, 2010 4:46 pm Post subject:

>>>12200 and 12500 RPM....Where the ignition curves change.<<

I thought the same for the MM too. Same motor just no restrictors...right? Yet, in my very brief perusal of the Orange Rotax Manual it says RPM at the top is controlled by the pipe on the JR/MM motor. (Note, also, in the manual all perf graphs end around 12.5K rpm for the JR/MM). The manual also goes on to say, in so many words, that if one uses a leaner main than advertised more RPM will be gained - which everyone knows for the Sr motor.

So is that all there is to Turbo - Lean and Loose? Low roll resistance?

mark

(That was some really good driving on the you tube vid.....to think they are all 9-12yo)

angus hunt · Posted: Wed Aug 04, 2010 9:01 am Post subject:

no mark, that's not it. check your pm.
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Phillip J. Arscott · Posted: Wed Aug 04, 2010 3:45 pm Post subject: