I recently blew the std 3010 fets on my 2008 drift Scooby Impreza wrx (AM board) by using an overgeared 50T pn :-(, so whilst I was down at Insidelineracing in Santa Clara i was able to pick up some newer 8858 FETS.
Thanks Guys, super super friendly shop - totally recommended :-) even loaned me multiple sets of batteries so i could spend time on their track after my own ones ran out.
one FET job later (done tonight) i pulled off the busted 3010's and put a single stack of 8858's on the am board, now in terms of a comparison to the older 3010's if I look at power handling, the new fets are equivalent to a double stack of 3010's.( excellent news)
i'm going to run various motors in the Scooby impreza but i don't think i'll go less than 50 turns in the drift car, is it excessive to add another stack on top for safety ?
I emailed Phil NG at PN ( super fast response Thanks Phil) and asked him for the recommended AWD gear ratios for the PN 50T, he sent me a great pic of the AWD gear chart and he says an 18 x 30 combo should be good on stock 3010's.
So, does it need to be completely belts and braces? even with the newer and 8858's are people still stacking them ?
I think the question is who runs mod class with an awd and stacked fets?, what fets, motors and gear combos are you running and seeing no overheating issues with?
if i ever go less than 50T i'm pretty sure i'll need to double stack, atomic says as much for their chilli, but their stock r evolutions looks good on a single stack of 3010's and it's a 44 turn ( must run cool).
Last question, since I burned out my 3010's and i replaced them with better ones since you cant get 3010's readily, does this mean I'm forever banned from stock class racing with a 70T ?
All useful advice appreciated, thanks !
__________________
Audi R8 LMS MA-010 70T
Subaru WRX 2008 MA-010 50T Drift car
Honda HSV-010 GT MR-02 50T
I'd add a second layer just for safety. Most stock class rules limit the motor, not the board, so you should be fine with upgraded FETs. Only exception I can think of would be a "box stock" class. Good luck!
he sent me a great pic of the AWD gear chart and he says an 18 x 30 combo should be good on stock 3010's.
What AWD gear chart is that? AFAIK AWD pinions come in 15/17/19 and spurs come in 27/29/31.
I'm running an untouched ASF board in my AWD with the stock Kyosho motor, I will eventually change this to a PN 70T. It runs fine with 15x31 which is the gentlest ratio you can get. Not terribly quick but it works fine for a tight track. Surprisingly I have not overheated with this setup, but I had heat problems in the past using a 3Racing motor with a taller gearing. It wasn't a problem with the FETs, just the motor got too hot and shut down.
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