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Old 11-13-2004, 12:34 PM   #8596
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triumph,
Try to get a 6.50 gear ratio with a stock motor. I'm useing a 75t spur and with a stock motor I have a 27t or 28t pinion depending on the track size.

BTW- Do you race at Hobbytown's on-road track?
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Old 11-13-2004, 12:52 PM   #8597
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Default Re: Need help finding a new Pro 2 chassis...

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Originally posted by RCknight
Hey guys, I have a friend that has a broken Pro 2 chassis and I was wondering if anyone knows where to buy one? I checked the HPI site and I don't see anything. Can you still get them and can you get it in 3mm? Thanks for any help. I thought someone here could point me in the right direction.
You have PM.
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Old 11-13-2004, 10:02 PM   #8598
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Dan roughly wat ratio 2 run a 10 turn double motor ? wats the internal ratio of the pro4?
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Old 11-14-2004, 01:36 AM   #8599
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The internal ratio of the Pro 4 is 2.4375.

triumph, to work out the final ratio the formula is:

(Spur Size/Pinion Size) X Internal Ratio

So say you had a 100 spur, and a 25 pinion and were using a Pro 4 you would do:

100/25 = 4
4 X 2.4375 = 9.75
Final Ratio = 9.75

Hope this helps.
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Old 11-14-2004, 02:09 AM   #8600
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For sale
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Last edited by coastaltony; 10-13-2007 at 06:34 AM.
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Old 11-14-2004, 10:51 AM   #8601
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Wich HPI Pro4 springs equals AE Red and Gold?
I'm planning on switching from AE springs to HPI ones beaucause it's not a perfect fit.
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Old 11-14-2004, 12:28 PM   #8602
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Quote:
Originally posted by Erlend
Wich HPI Pro4 springs equals AE Red and Gold?
I'm planning on switching from AE springs to HPI ones beaucause it's not a perfect fit.
I just posted the HPI spings in gr/mm and lbs/in... a page or two back.
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Old 11-14-2004, 02:45 PM   #8603
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Last night was the first in a local 5-track series here in Wisconsin/Illinois, and the Pro 4s did very well. I know Kevin Kane's car looked ballistic all night in stock foam, and the only 3 Pro 4's in stock rubber all made the show qualifying 3rd, 4th, and 5th and finishing 1st, 3rd, and 7th. I qualified 3rd and won in stock rubber and its the best this car has ever been. I ran the HPI 3mm chassis and 2.5mm upper deck and the car was super consistent all day long. Traction came up really high towards the start of qualifying, with many drivers fighting a traction roll condition. I was able to keep the car adjusted to where it needed to be and was able to run very consistently. I did have a problem in the 1st qualifier with the screws that hold the one-way gear on backing out (all 3, d'oh) and DNFed that run, but had a great 2nd round to get the 3rd best time. I also bolted in the Delrin diff halves...OMG, smooooooooooth doesn't do these justice. The diff action was awesome, much better than with the stock diff halves. The 2nd race of this series is December 11th, and I can't wait. The car has been getting better and better every single week.
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Old 11-14-2004, 03:07 PM   #8604
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What's the difference between rubber tires and foam tires on carpet? Which is easier and faster?
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Old 11-14-2004, 03:27 PM   #8605
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Am i being a little dum here or does the pro4 maunual contradict what the xxx main book says about the rear antisquat??

Does a positive antisquat give better rear traction than say zero or a negative squat.
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Old 11-14-2004, 04:42 PM   #8606
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The difference between foam and rubber is huge. You have to drive the car and set it up completely differently. Foam is more of a point and shoot horsepower game while rubber is more of a "flow the car and keep roll speed up" sort of thing. Foam is easier and harder all at the same time. You need to drive foam pretty punched, where if you do that with rubber you'll hog the car down and lose corner speed. Its easier because you have tons of grip, but you're constantly trying to free the car up take bite away.
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Old 11-14-2004, 05:10 PM   #8607
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These delrin diff halves you speak of, where do you get them, and whats the part#
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Old 11-14-2004, 05:35 PM   #8608
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Quote:
Originally posted by triumph
These delrin diff halves you speak of, where do you get them, and whats the part#
Hey the part number is HPI 75169. They run anywhere from 15 to 20 at hobby shops.
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Old 11-14-2004, 07:18 PM   #8609
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Thanks you!
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Old 11-14-2004, 07:23 PM   #8610
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I wanted to try Thad Garners carpet setup on the HPI site but I can't figure out what the spring rate on the Trinity purple springs is and I also don't even know where to begin with the iris green rear springs. Last what are the .8 3 hole pistons and the 1.1 2 hole pistons are. Are the .8 3 holes the number 5's that come with the kit? Any help would be great.
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