 |
|
| View previous topic :: View next topic |
| Author |
Message |
jim rogero
Joined: 18 Jun 2005
Posts: 1030
Location: United States, Florida, naples
|
 Posted: Wed Feb 23, 2011 9:21 am Post subject: |
 |
|
| Todd Bellew wrote: | 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.  |
Todd the info is there for him....... my quotes to him...
Keep digging....You may wanta get an ex. temp sensor in a used pipe to help in testing.
http://www.ekartingnews.com/viewtopic.php?t=97885&postdays=0&postorder=asc&start=15
What we found was we had it on Friday (test day) and lost it on Sunday (until the final). After digging through the data I found the problem. Ashley's exit MPH out of the bowl on to the straight was 1.4 mph less than Friday. I worked on the chassis to improve the bowl exit speed , ie lossened the rear. It was too loose the first 2 laps but was perfect the rest of the race. She hit turbo every lap afterward and went from 17th or 18th (last) to 3rd with fast time by 6 or 7 tenths.
http://www.ekartingnews.com/viewtopic.php?t=97885&postdays=0&postorder=asc&start=0 |
|
| Back to top |
|
 |
Todd Bellew
Joined: 26 Jul 2001
Posts: 2902
|
| Posted: Wed Feb 23, 2011 8:14 pm Post subject: |
|
|
JIm,
Yeah the egt is a good suggestion, I tried to explain what he would see it.
Now on your exit speed. I still think it's more a carb jetting function. Your carb was set so when you exited faster you achieved proper heat down the straight.
In the case when you lost it while going slower, I contend you could have had turbo also with jetting set to compensate. Of course, you weren't hoping for a huge drop in speeds. lol
My point being, The carb setting was more likely best for the higher speed(likely again based on gearing) exit.
Either way it's a pretty fine line.
_________________
Thank You,
Todd Bellew |
|
| Back to top |
|
|
Devin Smith
Joined: 08 Feb 2009
Posts: 87
|
| Posted: Thu Feb 24, 2011 7:39 am Post subject: |
|
|
| I wonder if you can get Turbo at Miller in July the Density Altitude could be quite high that time of year. |
|
| Back to top |
|
|
Todd Bellew
Joined: 26 Jul 2001
Posts: 2902
|
| Posted: Thu Feb 24, 2011 4:17 pm Post subject: |
|
|
DEvin,
I believe so, since I think it's a function of the carb obviously. It will just require the right settings in order to achieve it.
Thinking about it, less air and fuel could make it better. Just guessing.
_________________
Thank You,
Todd Bellew |
|
| Back to top |
|
|
Kevin Loster
Joined: 15 Aug 2001
Posts: 155
|
| Posted: Thu Mar 03, 2011 1:45 am Post subject: Todd.... |
|
|
July in Utah will probably see
7500-8000 feet Corrected Altitude
40-60 % Humidity
80-90 Degree Temp
And then throw in a couple of dust storms
Should be fun 
_________________
Kevin Loster
True North Motorsport |
|
| Back to top |
|
|
Brian Lohman
Joined: 07 Apr 2006
Posts: 165
Location: United States, Florida,
|
| Posted: Fri Mar 04, 2011 6:41 am Post subject: |
|
|
| And don't forget to bring your pigtail coil if you want to be competitive in micro/mini. |
|
| Back to top |
|
|
jim rogero
Joined: 18 Jun 2005
Posts: 1030
Location: United States, Florida, naples
|
| Posted: Tue Mar 22, 2011 4:17 pm Post subject: |
|
|
| Brian Lohman wrote: | | And don't forget to bring your pigtail coil if you want to be competitive in micro/mini. |
My driver has the choice of having a "pigtail" or not having a "pigtail", does this give us an advantage?  |
|
| Back to top |
|
|
Dale Seeley
Joined: 11 Nov 2005
Posts: 524
Location: United States, Georgia, Marietta
|
| Posted: Tue Mar 22, 2011 4:35 pm Post subject: |
|
|
| We did back to back to back comparisons of an old coil, the new coil, and the pigtail coil on the dyno, zero change in curves. Surprised me too. |
|
| Back to top |
|
|
Dale Seeley
Joined: 11 Nov 2005
Posts: 524
Location: United States, Georgia, Marietta
|
| Posted: Tue Mar 22, 2011 4:36 pm Post subject: |
|
|
| jim rogero wrote: | | Brian Lohman wrote: | | And don't forget to bring your pigtail coil if you want to be competitive in micro/mini. |
My driver has the choice of having a "pigtail" or not having a "pigtail", does this give us an advantage? |
You got me Jim... good one...  |
|
| Back to top |
|
|
Horatio Fitz-Simon
Joined: 12 May 2010
Posts: 37
|
| Posted: Tue Mar 22, 2011 8:24 pm Post subject: Turbo |
|
|
Guys, I am a man with no knowledge of Rotax whatsoever, everything is new, when you say Hop in the seat or jump what does that mean exactly.
Thanks |
|
| Back to top |
|
|
Brian Lohman
Joined: 07 Apr 2006
Posts: 165
Location: United States, Florida,
|
| Posted: Wed Mar 23, 2011 6:35 am Post subject: |
|
|
| jim rogero wrote: | | Brian Lohman wrote: | | And don't forget to bring your pigtail coil if you want to be competitive in micro/mini. |
My driver has the choice of having a "pigtail" or not having a "pigtail", does this give us an advantage? |
Your driver definitely works/looks better with the pigtail. Most others don't
Last edited by Brian Lohman on Wed Mar 23, 2011 6:41 am, edited 1 time in total |
|
| Back to top |
|
|
Brian Lohman
Joined: 07 Apr 2006
Posts: 165
Location: United States, Florida,
|
| Posted: Wed Mar 23, 2011 6:39 am Post subject: |
|
|
| Dale Seeley wrote: | | We did back to back to back comparisons of an old coil, the new coil, and the pigtail coil on the dyno, zero change in curves. Surprised me too. |
Dale, from what I've been told, no hp advantage, but timing/advance with the pigtail works better on getting the micro/mini over the 12,500 rpm timing hump. |
|
| Back to top |
|
|
Charles Breidinger
Joined: 09 Dec 2009
Posts: 12
Location: United States, California,
|
| Posted: Wed Mar 23, 2011 9:29 pm Post subject: Re: Turbo |
|
|
| Horatio Fitz-Simon wrote: | Guys, I am a man with no knowledge of Rotax whatsoever, everything is new, when you say Hop in the seat or jump what does that mean exactly.
Thanks |
Horatio, Hopping in your seat means to hop your bottom off the seat at just the right time while going down the straight away. This removes your weight from the kart for just a split second which allows the engine to rev past the 12,500 mark into the turbo region. Be careful doing this as it can make you swerve your kart at high speed and it does not always help get turbo. |
|
| Back to top |
|
|
Edward Louis
Joined: 24 Dec 2008
Posts: 138
|
| Posted: Sun Mar 27, 2011 3:15 pm Post subject: |
|
|
| Brian Lohman wrote: | | Dale Seeley wrote: | | We did back to back to back comparisons of an old coil, the new coil, and the pigtail coil on the dyno, zero change in curves. Surprised me too. |
Dale, from what I've been told, no hp advantage, but timing/advance with the pigtail works better on getting the micro/mini over the 12,500 rpm timing hump. |
you mean just mini?
micro's dont rev to 12.500 |
|
| Back to top |
|
|
jim rogero
Joined: 18 Jun 2005
Posts: 1030
Location: United States, Florida, naples
|
| Posted: Wed Dec 26, 2012 1:33 pm Post subject: |
|
|
013 FWT ROTAX TECHNICAL REGULATIONS
Today's News...
The 2013 FWT will not implement the recently announced 2013 Rotax Technical Regulations, but will continue with the 2012 Rotax Technical Regulations, as posted on the FWT web site, until further notice.
The 2013 FWT will implement the use of the Mini Max rev limiter, beginning with the first rounds at Palm Beach. For details regarding the Mini Max rev limiter and its implementation contact Josh Smith of MAXSpeed Group.
FKP’s Bill Wright: “I’d like to thank Josh Smith from MAXSpeed Group and Andy Seesemann from CotA, and our respective technical support staffs, for working together to make some important decisions regarding the Rotax technical regulations to be used at the 2013 FWT. Working together we can provide consistency across all our programs and that further strengthens the already incredibly strong Rotax kart racing program in North America.” |
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Go Top
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Login to check your private messages
Login
