I was reading on here that a crank pulley is not a good idea to do with dynoflash...is this true? I don't see why it would matter, just would like to know the truth.

 

anybody??? Al has not returned my phone calls.

 

Al has clearly stated his advice to not run pulley without a harmonic balancer. Do you think the struggling mitsubishi would have hung a 130$ pulley on the crank when they could have got by with a 30$ aluminum pulley? Crank harmonics are worse on a 4 cylinder than any other engine design.

 

You can use a crank pulley with my flash as with any other tuning method.

However, I have recomended that you DO NOT get a crank pulley on a 4G63 - IMHO not a good idea

For kicks - my 9.98 second 667 whp 2.0 L evo runs a stock crank pulley for what its worth

 

667? I thought it was more whp
Your car is sick heheh

 

Wow I put this post up a week and ahalf ago and now I am getting response.

Well I talked to another company that did flashes and they said a crank pulley would not adversely affect the results. They pointed at tuning methodology more so than the pulley being at fault. More so they said if crank pullies were bad on engines then all the companies that make them would be out of business. Obviously there is a market for the pullies.

Thanks for your response, although I am still skeptical to why it would be causing the ill effects.

 

I thought that was what the balancer shafts were for? You are a drag racer rotating mass is your friend! It gets you off the line faster!

 

If its not needed for thoughs kinds of hp numbers then I am not wasting my money!

 

There is a difference between a harmonic balancer and a harmonic dampener. The EVO's and all 4G63 engines have a harmonic dampener. People seem to mix these things like their the same thing. When actually balancers are used in many different applications, mostly older V8's and not really any 4 cylinder of present Fuel Injection. I have greatly researched this topic and still I come to NO conclusions on why not to use a crank pulley that is without harmonic dampening.

There is NO proof other than it does not like to be tuned on why you should not use a pulley on the EVO. This is the largest disagreement I have seen. There must be a way to tune out the knock if it suposes in the engine resulting in more knock but I can't believe an incompatability with the flash, that just seems silly. I have read the whole other 6 page thread about this, and researched HOURS on the internet on this topic, reading about harmonics and balancers and how they work. There has to be another answer to this one.

The balance shafts are there to keep the crank in balance and to lower vibration in the engine at higher RPM. They work much like a harmonic balancer although a balancer would be more effective if in fact the crank was not decently balanced already from the factory. The balance shafts are even said not to be needed, although Mitsubishi wasn't cutting all the stops to make the EVO a racecar.

As you just said would you "waste" money on 10HP for $70? I don't think so.

 

Well,
My step-father is a machinist and works part-time in Kevin Harvick's Busch Series shop In Winston-Salem, NC. He was the one who told me it was fine to install a pulley. He also said they run pulleys in all of their cars. This is a multi-million dollar complete racecar fabracation shop not just a local "bolt-on" shop, so I listen.

 

I see you have the AMS pulley, what do you think about it?

 

Please response only if you have the pulley on your car. I'm also interested on this FACT. No need for more internet engine experts. Thanks :}

 

I have been running the AMS(Atlantic Motosports) unit for 20,000 miles. This is one of those mods you will feel! The car tachs faster, it has more pre boost pull(less mass to rotate), it doesn't affect driveability in crappy first gear heavy traffic. The car just pulls a bit harder all the way to redline when you put your foot down! I'm not an expert, this is just what I noticed. All of the pulley makers claim 10-15HP gains. I tend to agree.

One thing to remember is that you will have to put the stock unit back on to change the timing belt or add cams as there is no TDC mark on the underdrive pulleys.

I put down 260 WHP and 250TQ with my mods and AFRs so rich they dropped off the graph(below 10) at 5500rpm. I'm sure just as soon as I get my EVO properly tuned I'll do alot better.

 

LOL You def need a tune. Head to TurboXS or Mach V I bet you can get at least 310WHP 320WTQ

 

I had an unorthodox pulley on my 98 eclipse gst for over 30000 miles with no issues (never crankwalked either). I read both the good and the bad and decided to put one on. saw no ill effects. I have not put one on my evo, and don't plan on it. I didn't think that I saw enough of an increase to spend the $100, and felt that there were other ways to invest the $$.