Are any of you guys with a sc and the MEVI planning on raising the rev limit? Is there any reason not to, as long as you don't overrev the blower?

 

Confused is your man on that one... he loves his 7k limiter.

 

love the 7k, hate the mil.

 

What code(s) is it tripping?

 

Auto Tranny.... go figure.

 

So, with a turbo or supercharger you can still raise the rev limiter to 7k or even 7.2k????

 

yes and you use bigger injectors and run on stock fuel pressure.

 

But with using the stock fuel pressure, and say running 10 pounds of boost on a turbo setup, won't you have detonation/leanness? So, wouldn't a different FMU disk be used in the Vortech FMU to add more fuel to the increased boost?

 

could be, there are limits to what the ecu can handle. jwt recommends upgrading the fuel pump for more flow if its lean up top. You don't use the vortech fmu.

 

Then what do you use as the FMU in the turbo kit?

 

With the larger injectors and ecu there is plenty of fuel without raising fuel pressure. If your stock fuel pump is falling off at wot and at the upper rpm range then you may need to upgrade the pump. The stock fpr raises 1:1 and the jwt uses the maf to reference boost. I am still not sure if I want to sell mine if I decide to mevi later.

 

Sounds like maybe JWT sent you an ECU for a car with an automatic? Do you get all the codes related to each of the shift solenoids?

 

no.. just one.. 1605 i think.

 

ok let me preface this by saying i Do not know superchargers overly well as you will probably be able to tell haha.. turbo's my thing

but, if superchargers are already getting maxed out around what 14/15psi-ish where they can't handle anymore and break? then wouldnt rev increase to 7200rpm be that much worse on them even if your boost is down to "safe" because high revs is when they are spinning the fastest, causing them to overspin or whatnot? sorry i dont know all the technicalities, goin out on a limb here haha

 

I think if you wanted to raise the rev limit to take advantage of the MEVI, then you would want to use a pulley size that prevents over-revving the blower at the new redline. For instance, with a 7200 rpm redline you are pretty close to the 50000 rpm speed limit for the V1 blower using the 3.25" pulley. (I used a crank pulley diameter of 6.5 inches. Is that correct?)

I have a feeling that over-revving the blower is more of an issue of decreased bearing life than an issue of catastrophic failure (up to a point). Of course, if you spin it fast enough the impellor will come apart, but I've never heard of any Vortech blowers doing that, so there is apparently an adequate safety margin against catastrophic failure built in. Satisfying fatigue life requirements alone will require that the safety margin relative to yield strength be substantial. If anybody has heard otherwise about catastrophic failures of Vortech blowers, I'd be interested in hearing.

 

agreed except i think its 6.21".

 

Correct on both accounts. I spin at ~55,000 rpms peak, even Vortech admited that their is some headroom in there 50,000 limit. The issue is really heat in the impeller, as it spins faster it heats up and will expand and stretch, if it grows too much it will rub the casing and score it and maybe cack up at speed. I sent my blower back to Vortech to be rebuilt after ~70k miles and it had no scoring, just a leaking input shaft oil seal.

 

Good information!