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Old 05-23-2008, 03:19 PM   #1096
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Thanks so much for the detailed reply. I appreciate it.

In our club the best drivers and the majority of us are racing with 27T.

A bunch of our club was at the big TA nationals race and in the top 20 racers of that event everyone was 17.5 but our best TA racer who was at about 12th place for the 20 car 8 minute main.

Personally I'm itching to ditch my NiMh.
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Old 05-23-2008, 03:30 PM   #1097
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I was wondering what FDR's are being ran when using 27t brushed motors.
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Old 05-23-2008, 04:13 PM   #1098
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A 5.5 fdr for 27t/4 cell seems to be a good starting point I have mine geared at 5.53 in a T2R
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Old 05-23-2008, 07:58 PM   #1099
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Quote:
Originally Posted by losi nut View Post
A 5.5 fdr for 27t/4 cell seems to be a good starting point I have mine geared at 5.53 in a T2R
what motor are you running
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Old 05-23-2008, 09:20 PM   #1100
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CO 27
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Old 05-24-2008, 06:53 AM   #1101
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Our 27T racers are anywhere from 5.1 to 5.8
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Old 05-24-2008, 07:13 AM   #1102
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Quote:
Originally Posted by chicagokenji View Post
Our 27T racers are anywhere from 5.1 to 5.8
What about the 1.5 4 cwll?
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Old 05-25-2008, 10:02 AM   #1103
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Since you guys seem to be the only ones working with older chassis' nowadays I'll ask this here.... What does it take to fit 3800's and 4200's into a TC3 and XXX-s chassis??? I just got my cars used and the cells I bought for them don't fit very well.....
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Old 05-25-2008, 12:48 PM   #1104
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Quote:
Originally Posted by IMPACTPLAYR View Post
Since you guys seem to be the only ones working with older chassis' nowadays I'll ask this here.... What does it take to fit 3800's and 4200's into a TC3 and XXX-s chassis??? I just got my cars used and the cells I bought for them don't fit very well.....
I know on the TC3, you're going to need to do a little dremeling around the battery slots and flip the flat part of the battery strap on the cells (the "stick pack side")...and I use 2 screws to attach the strap to the chassis - not 2 body clips

I run 4200's in the my TC3 on the dirt oval and that's what I had to do
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Old 05-25-2008, 06:10 PM   #1105
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Quote:
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What about the 1.5 4 cwll?
17.5 4 cell??!?
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Old 05-25-2008, 07:25 PM   #1106
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Today, we had our second VTA race and had 5 cars, there were only 8 in 13.5 TC. At mid afternoon the track temp was 115 F. there were 2 21.5/lipo cars and 3 brush motor cars, 2 27t/4 cell and 1 Sprint2 RTR with a 68 camaro body(this car wasn't really a factor at anytime) The dominate car was my 2nd car, a 27t/4 cell, I put together for comparison to the 21.5s. It had a co27 motor, old woke up cells, GTX esc, geared at 5.53 fdr in a T2R xray. I will tell you that the driver is one of the smoother drivers and is usually in contention for the win in the 13.5 tc's. Speed wise the cars were about the same down the straights, and out of the corners the BL cars seemed to have more grunt. We both had our 21.5s geared at 4.32 & 4.36 fdr. When everybody's fast laps were compared, there wasn't a lot of difference between them, maybe 2 tenths, until the main when the fast lap turned by the hotshoe was a 18.7 and the best anybody else got was a 19.2. We ran the 8 minute main and reversed the direction, Sorry about the long post, but it was enlightning today, I honestly didn't think the 27t would hang with the 21.5 lipo cars. Laterz
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Old 05-26-2008, 06:46 AM   #1107
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Losi Nut, thanks for the detailed report. The info is very helpful.
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Old 05-26-2008, 09:12 AM   #1108
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We had our first VTA run at Prime Time in Calhoun GA yesterday. We only had four cars, but we had lots of fun. I think we were all running 27t/4C. I was getting dusted down the straight, but two of the other cars dumped during the eight minute main. Second place just for surviving.
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Old 05-26-2008, 09:28 AM   #1109
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Quote:
Originally Posted by snoopyrc View Post
We had our first VTA run at Prime Time in Calhoun GA yesterday. We only had four cars, but we had lots of fun. I think we were all running 27t/4C. I was getting dusted down the straight, but two of the other cars dumped during the eight minute main. Second place just for surviving.

Dumping Trans Am 4-cell packs on stock motors? Those cars should run a good 12-14 minutes without much trouble. Time to get some new battery packs or reconsider your gearing.

Gearing FDR recommendations:
27t brushed/4-cell: 5.4 - 5.6 FDR
17.5 brushless/4-cell: 3.5 - 3.7 FDR
21.5 brushless/LiPo: 4.2 - 4.3 FDR
This should get you close to the ideal gear ratio, and at the very least, achieve some parity between all three combos. The 21.5 FDR will probably be mandated in the final rules because by going up from there on larger tracks, they will get faster, unfortunately.


To any of you preparing to run 21.5/LiPo combos this summer, please keep in mind that it is an extremely strong possibility (read: likely) that the Novak 21.5 will be the ONLY motor allowed for this formula in Trans Am. It will be a spec motor, but LiPo batteries will probably be limited to 5000 mAh. This is where the tentative rules are at the moment.



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Old 05-26-2008, 09:43 AM   #1110
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Jusy for what it's worth,, the 4 cell packs I used sunday were ones that had been just sitting around for about 18 months with out any kind of care. By woke up, I meant that I cycled them once and used them. I have some generic 4400's from max amps and some matched 3300's i got from B&T some time ago. and didn't dump at at all. Here's a pic of the 5 we had sunday, the green Mustang is the winner
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