REX PR321P Tune
 

I was wondering anyone did any review or testing on REX PR321P Tune?

Say comparison with differerent motors? like

1. JP RX21 R1 Kangaroo
2. REX PR21 Mario Rossi
3. Novamax MX21
4. RB C5 Rody/Collari

would like to get some info on this motor! TIA

Chris, Ron, Ryan? arent you guys running the Tune 321P?

Thanks again

Re: REX PR321P Tune
 

Chris? Ron? are you guys getting ready for TFT? if you would please let me know how it goes!

and especially the REX tune one !hehe Thanks

Re: Re: REX PR321P Tune
 

Just go out and buy one.:lol: You'll like it.

I'll see if we can get someone to post qualifying order after tomorrow.

Re: Re: Re: REX PR321P Tune
 

:lol: :lol: :lol: :lol: :lol: :lol: hehe did already! kaka kaka

I'll break it in coming saturday

Re: Re: Re: Re: REX PR321P Tune
 

Breaking in the motor today, here is what happened

Idle it very rich one tank on the starter box and kept blimping it as it idle, then ran it pretty rich for 4 tanks on the track man it is very very hard to not lean it out! but I still did, couldnt resist!

but the good thing is Christ was there, he warned me about running it lean...... so I richen it back up again, ran another 5 tanks then start leaning it out, kept the temp at 200 for the next 5 tanks.

man this motor is pretty darn powerful, tons of bottom end (compare with JP R1) and i think the bottomend power is similar with Mario Rossi PR21 or Max Power MX21.

after 15 tanks, when the motor is at operating temp, it doesnt bind at TDC, but when it's cold it still grabbed a little, I guess it still need more fuel running through it.

I'll post more info after next run!

Re: Re: Re: REX PR321P Tune
 

And Thanks Ron for the tips, running the headshim at 30 thousand.

I saw it run, sounded very good. It looked very good, I can't resist a motor with a dark blue head:lol:

Re: Re: Re: Re: REX PR321P Tune
 

You're quite welcome Tony...

Seem like you may now start sinking in that Needle Screw (little by little) and make that motor SCREAM ! :)

Re: Re: Re: Re: Re: REX PR321P Tune
 

Hey Buddy, I was at the track yesterday, the motor is getting close to be fully broken in, it is getting faster and cooler now probably a few more tanks or so!

Bottom to mid is very powerful but seems like rpm pick up is not as fast as JP and the top too!

after it is fully broken in I will put the JP back in there do a back to back comparison, and I will try different gearing too! (since this motor seems like it has more torque), I might be able to get away with 21t 2nd pinion instead of 20.

Hello everyone how much is this motor?Is it modified?I am looking for a rex 321p onroad.Does anyone know of a good place to buy one of these.thanks
mike

321P Tune version is tuned by Mario Rossi

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