'Turbo' in MiniMax

Derek James Sobel · Joined: 11 May 2008 Posts: 123

Derek does not know any of this. I did not expose him. I cannot believe that Jim would let a little girl going on 14 be aware of all this! As for finding out new things, Jim as admitted to being the track fairy in the General karting, wka Man. Cup. page 6 Post. A must read. Don't bend over to pick up a wrench! LMAO

angus hunt · Posted: Tue Oct 05, 2010 4:55 pm Post subject:

hey ray, it's richie, angus' dad. i saw you write that derek moved up to jrs. we did too! got tired of the turbo in minimax and angus is loving jrs. we'll be at ocala on friday and saturday. any chance you guys can make it up? angus would love to race with derek again. we moved up shortly after the GN's and have had about 5-6 races so far. he loves it so much that we quit the oval racing, but we are starting skip barber next month. now that angus is 12 (finally) they are letting us in.
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Derek James Sobel · Joined: 11 May 2008 Posts: 123

We are kicking around the idea of going to OGP this weekend. I hope we do. If so, we will see you there! Thanks! Very Happy

Jamie Mardis · Joined: 12 Jan 2011 Posts: 6

Jim,

Thanks for all your information in this thread. Being new to karting there is a lot of tech data in here. Going Print it out and read it 20 times Wink

Rick Sweeting · Posted: Sun Jan 16, 2011 2:06 pm Post subject:

With the new carb rules, it looks like rotax listened and reacted to the "Turbo Whine". Smile

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Jamie Mardis · Joined: 12 Jan 2011 Posts: 6

yes,

Garry from MRP Motosports thinks the problem should be resolved with the new carburetor specs.

Ryen Miller · Joined: 27 Aug 2001 Posts: 138

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jim rogero · Posted: Mon Jan 17, 2011 4:29 pm Post subject:

We ran the 12.5 with the new spec floats...Some may have been running the 8.5 but we didn't do enough testing with it in our short time in mini max.

Harj Singh · Joined: 12 Aug 2010 Posts: 153

Does the Jet-tech pro software give you the turbo you require when adjusting to its recommendations?

I am curious about this before I purchase as we just started out in Mini-max this past weekend and I heard the turbo a few times in Ocala with my DIY Jetting based on plug look.

Devin Smith · Joined: 08 Feb 2009 Posts: 89

Rick Sweeting · Posted: Tue Feb 15, 2011 6:47 am Post subject:

Yeah the turbo is still out there, guess that will encourge some to move to junior class. Confused

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Ted Murphy · Joined: 17 May 2010 Posts: 40 Location: Canada, ontario,

You get turbo with the 12.5 - for sure. The US rule changes did nothing to prevent turbo.

Aside from a redesigned coil, IMO the best way to eliminate (drastically reduce the chance of) turbo is to move to a spec jet. While I'm not a fan of spec'd jets (i actually enjoy the science/art of tuning) it creates the level playing field that Rotax is designed to be (for Minimax).

While the 2011 Minimax reg's for Canada have not yet been released, for 2010, 3 Minimax reg's pretty much eliminated the chance for turbo:

1. the 8.5 carb with 3.6 floats (one race I recall used the 12.5 but spec'd a 152 jet)
2. a spec jet - almost always a 155
3. 6.5 or 7.1 rear tires - these have a larger circumference than the 4.5's

Mark Spikes · Posted: Sun Feb 20, 2011 2:46 pm Post subject:

Would throwing out the Spec Gear reduce or eliminate the effect of Turbo?

mark

Ted Murphy · Joined: 17 May 2010 Posts: 40 Location: Canada, ontario,

Todd Bellew · Joined: 26 Jul 2001 Posts: 2902

Ok I painfully tredged through this post to see if any one saw the glaring line on the data from way back? They didn't.

Notice the "turbo"(thats so ridiculous) line at the very entry of the straight away. I figure since the curve matched for a while after that the data that early was thrown out.

But, on the hot curve there were more rpms through the corner and ultimatley shortly after started mathcing the lame curve. However, those additional rpms at the beginning probably jumped the egt up at the start meaning that at the end it was higher and pulled those last few revs.

Ihor, look at more data and try and see if this correlation exists. More rpms out of or in the corner relating to getting the turbo.

But, you have horrible scavenging at those types of r's with this pipe. Meaning having more "spent' gas hanging around, another by product of too much fuel without enough time to burn it.

I'm all for Spec jet and gear......

Right after spec axle, rear track and tire air pressure. Oh and how much tape you can run also. Rolling Eyes

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