Racing an RX

[D1 WTF]

in terms of racing there is someone on here that does race one.  he has not stripped it down too much if i am right.  but i really cant think of his name.  oh yes i can he goes under AtomicRX or something like that.  Carl is involved with his car aswell, so as a builder that would be the one to talk to.
P.S a rex will kick a supra everyday of the year, so look no further.

[TonyC]

Thanks again. If Weight can be between 1100 and 1200kg than I\'ll be reasonably content - although I\'ve been quite creative in the past in loosing weight in the car. Good useful guide info there though.

regs are pretty simply and it is class based, going on engine capacity (with a trubo multuplier) and tyres used. Beyond that you are pretty much restricted to engines from the same manufacture and pump fuel (plus the usual safety gear). So if you had a blank cheque book you could build somethign ridiculous and smoke everyone. But my blank cheque book must have got lost in the post - so this isn\'t a no-holds bared build - and it doesn\'t need to be. Good power, and good chassis balance is what I\'m after.

I\'ve been chatting to the Supra owners as well, and as you can imagine they are finding reasons why the Supra is better! One guy has raised two points whihc were interesting though - fuel and noise.

For a rotary engine running around 350 flywheel bhp are there reservations on the correct octane level of the fuel. Is optimax/vpower with millers safe and sufficent?
Secondly, I\'ve presumed the rotaries are a quiet engine, but I\'m bien gotld I\'m wrong. For racing their are increasing stricter noise limits and I\'ll need to keep the car ar around the 103db mark (or a little less ideally). I\'ll be sorting out a custom exhaust but are their breathing issues if you silences these cars a lot?

Cheers again.
Tony

[ScuttleRX]

Im guessing this may be against the rules, but are you allowed to run Water injection?

You should be able to get to 350 f/bhp on optimax without too much trouble (fair few have done it on here) and still be safe. WI would be a nice safety net though, and if you went for a full on mappable system you could get some bhp gains from running leaner AFR\'s and ignition advances.

For the power you want I dont think you\'ll have a problem exhaust wise, there are a few biggish bhp trackday-ers on here which need to be under noise limits and they have managed it. There is a thread about quiet exhausts at the moment actually http://www.mazdarotaryclub.com/forums/showthread.php?t=30907 with some comments on good systems for keeping the noise down.

[TonyC]

Great thread! Thanks. Water injection would be possible. Would have to be put on the cost vs benefit scales though.

[Red and Single]

I run at 330 rwhp at 0.85 Bar on Optimax using a T04S turbo.

I\'d imagine a T04Z to be the best turbo for a track car, early spool up, big power.

You wont need race fuel untill you go over 1.2 bar afaik, but you dont sound like you want to go that far even so no worries at all there (1.2 bar = 400 at the wheels roughly)

Noise wise, if you go single turbo (which you really must do if you wanna race it) dont get a screamer pipe :rollin

[ScuttleRX]

If cost was a factor I dont think you could go wrong with a simple boost activated system (around £200-£300 mark), would provide a lot of detonation prevention as well as constant intake temps around ambient or possibly below depending on set-up.  

Heres a thread I started quite a while back when I first installed the kit if you fancied a read just showing how if affected my set-up, sdminus has posted some replys on there too, at the time he had just installed a simple system but has developed it into a great set-up now (12.0 1/4 mile on stock turbos, stock engine!)

http://www.mazdarotaryclub.com/forums/showthread.php?t=16789

Looking forward to seeing your race car, make sure you post up lots of pics when its built

[nikp]

Noise wise, if you go single turbo (which you really must do if you wanna race it) dont get a screamer pipe :rollin

God no - i experienced mine for the first time a couple of weeks ago. Loud as hell! ASBO on wheels!!!

[TonyC]

That WI stuff is very interesting.
What\'s involved in moving to a single turbo? Presumably you simplify a lot of the plumbing. Are there any threads regarding the change? IE: parts, cost, etc.
I\'ve been told the sequential setup on the car is a bit of a nightmare of parts?

[nikp]

As far as the twin turbo setup goes, it is complicated, but i think that if you\'re mithodical, then you can fix any errors that occur. However, a single setup is by far a LOT simpler.

You need uprated fuel pump, secondary injectors, manifold, wastegate, plumb back in downpipe and turbo. Uprated intercooler too. For the amount of time you\'d be spending racing, possibly a radiator too, although the heat build up might not be too bad. Something to be done for in the future maybe?

[Red and Single]

Tony, if you are budget conscious, you need to buy a car with a single turbo allready installed, it\'s so much cheaper.

But from stock you\'ll need.....

Turbo
Manifold
Wastegate
Boost Controller
Downpipe
Decat
Exhaust
Intercooler, Stock, Front or Pref V mount.
Bigger Injectors
FPR
Bigger Fuel Pump

That adds up to well over £5K and then you\'ve gotta get an ECU and get it mapped.

Seriously, get one with it all done already !!

[ScuttleRX]

^^^^

ecu as well

[TonyC]

Zoinks! Quite a lot of stuff then. I\'ll probably use the sequential and only make a switch if either the power isn\'t sufficent (not likley), or the power delivery is unsuitable for racing (no idea!).

Also, I\'ve read the \'rats nest\' mentioned a few times in threads - what is it?

[ScuttleRX]

Just a nick name for all the vacuum pipes as theres rather a lot of \'em

[TonyC]

Any pictures to scare me!?

[grinder]

just out of interest - did you find anyone local so that you could have a nosey round their car ??

there is a monthly meet at warrington - could be too far away from you

might mate has an FD in preston - thats pretty close to you

Stu