Big streetport now and will hit past 8800 rpms wich is the stock rev limiter I believe. Can I jumper something in the ECU ?

 

I didnt see a stronger flywheel in your sig. Something you may want to look into. Its been rumored the stocker likes to come apart at 9k+. Im not entirely sure if there is an actual rev limiter in the car, or if its just you are hitting the 60-65% duty cycle limit in the ecu.

 

I can't imagine much other than the ring gear coming off that heavy *** flywheel, but everyone has the conflicting ideas of the s5 rev limiter, some say it's the ECU cutting out at 8,800rpm, other's say it's just the injectors refusing to go any higher than their current duty cycle (affirming what dr0x said) HAILERS would be good for this sort of task, but he's a s4 guru, Scott 89T2 would probably be another likely canidate to ask, along with Icemark. I don't think I offered much help at all, but *shrug* I've wondered this myself and those are the people I plan on asking when I get around to it

 

Read the FSM, pages F1-77 (NA) and F2-75 (Turbo). It states quite clearly that fuel is cut to the rear rotor at 8500rpm. I don't know why people keep arguing about this... Until I see someone prove this, I'll continue to disregard it as an illogical myth.

 

You've obviously never watched a high-rpm flywheel failure...

The two I seen resulted in the destrction of the bellhousing, clutch (obviously), rear engine plate, all the brake lines directly above the flywheel (caused a small fire on one) and bonnet, plus other bits and pieces. Huge, expensive mess.
Both are on video at www.3rotor.com but I saw them up close and personal.

A quality steel flywheel is mandatory over 9000rpm.

 

Well im goign to make power over this mark so what do I do ? 8500 ? I was shifting at this point when I had stock ports...

Is tier a way I can trick the ECU?

And is an aluminum flywheel more dangerous than steel?
fixed my sig

 

Also, I think you'd need some kind of scatter guard. Have you lightened or balanced any of the internals? Are there problems with ignition break up at that RPM?

 

why would the ecu cut off at 65%???.... and even if for some reason it wanted to. it still woudln't "cut out" it would just slowly lean out. it's a rev limiter..

I would really get a scatter gaurd around the bell housing... I know someone who almost lost there legs. (instead it only destroyed the whole firewall and floor.) and lots of people do. the flywheel will cut them right off when it comes apart.

 

Yes I would have to agree a scatter guard is required for those kind of RPM. Flywheels are not only spinning really fast but they have sharp edges and will cut through stuff if they break apart. Trust me, my shop teacher dropped a flywheel on his toes and it puntured right through his big toe, so if they can do that moving like 2 feet per sec think of what they can do if they break apart at 9000RPM!!! Goodbye legs and car is written off!

 

Mazda put the limiter there for good reasons. You've never mentioned anything about internal mods to handle those sort of revs, plus it's highly unlikely the ECU's fuel and ignition maps with be any good either (why would Mazda tune the ECU past its limiter). The rev limit is part of the internal software, so it can't be tricked externally. You'd need a rewritten chip, but you have to be careful with those.

If your porting really can make useful power that high, than you reaaly need to give up of the stock ECU and consider an aftermarket programmable ECU. I think the stock ECU just won't give you the results you're after. In the mean time get it on a dyno to find out if you even need to rev that high. Aluminuim is not as strong as steel, but it's the construction of the flywheel that's more important. You need to contact the company that made it and ask them what rpm it's safe to. If they can't/won't tell you, I'd be worried...