There should be no difference but there might be some depending upon the components used. You do need to have a Ferrite man on the motor if you decide to use an F1 chip as they are prone to noise from there. Both chips are good to drive a motor than is about the 20k rpm mark. If you use a higher revving motor watch out for the current draw as that can kill a Scalextric chip.
I've heard that MRRC cars can be pretty torqy, which usually means more amp draw than usual. They make rally cars and parts, after all, where torque over RPM is better. If you chip it with any Scalextric brand chip, test it first with the wheels up by going at different speeds and different amounts of acceleration, up to the point where you're pinning it for a second and fully releasing it over and over. If all is well, try the car out without any magnetic traction. Run a good 50 laps if you can. If that's still good, then you can add magnets if you want, but start out with just a little at first. The more drag you create, the more amps the motor will need, and the more likely the chip will blow.
If at ANY point the motor stops or slows unexpectedly, even if during the "wheels up" test, then the chip is being overloaded. If that's the case, you have three options:
1) replace it with a slot.it brand SSD chip. They can handle more motor
2) add a second chip in parallel to the first (only one LED is needed for lane changing, though). This will split the load between the two chips, and it will work better
3) upgrade the chip's mosfets to ones with a higher power limit. RichG has a thread on this if you're good at soldering tiny things, or you can have someone else do a chip for you. I know that gmyers does them at a reasonable price, and I know others have done them both for themselves and other people, but I can't volunteer on their behalf. ;-)
Thanks for the input/advice guys. I am particularly intrigued by the 2-chips-in-parallel set up but that does mean that more space would have to be found in what are already sometimes very tight quarters. Just for your interest, at the club where I race, several guys have successfully used Scaley F1 chips with motors of 25k rpm and more (though not much more !) but have had to be cautious not to over magnetize .
I have attempted the double chipping on two occasions now; the first one worked fantastically well and the second blew 2 x F1 chips. Since then I have not bothered with it ...... it can be far to costly. As Bigbird has mention have the diodes uprated is a much, much cheaper option. Probably, the nearest fixer to you is Greg Gymer who is in the States and uses this forum (gymers) as well.
I hope you're not competing against them when they have upgraded chips and you don't. That wouldn't be very fair to you. :\
When we race, we have a rule about upgraded chips. So far, not everyone has one to use, so we all use stock chips.
Thanks MrFlippant. No one is actually racing the GM chips (as yet !) but some of the guys have them in non-competition cars. The club's original ruling on chips was that they had to be standard chips but when the first GM chips were viewed (Scalextric Saloon DPR), it was found that there was no way visually to differentiate these from the standard one and the members thought it would be pointless to have a rule which could not be enforced. The rule is now changed so that the Greg Myer chips are allowed. We did some back-to-back tests comparing standard Scaley cars, using the standard DPR chip and a Greg Myer one. There was a definite performance gain with the GM chip.
I agree that it is not fair to have standard chips run in the same class as modified chips, but don't know if there is any way to easily distinguish one from the other.
You can tell, but you have to look closely. You'll be able to see that the solder joins of things are not quite as perfect as a stock chip. I don't remember if the replaced parts are on the visible or covered side of the chip, though. You're right, though, that honesty is the best policy. Hopefully no one feels the need to win enough to knowingly put a modded chip against a field of stock ones.
One of these days I plan to get 6 DPR chips upgraded and use those as needed for my various DPR based IROC car sets, especially the ones I use for parties, as the stock chips can start to slow down after a couple hours of constant running with magnets.
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