Back in the days when the Mustang "Five-Oh" was the ruler of the teen streets, in order to make big power, you have to buy a "blowa" (read: not a supercharger, a "blowa" is different) and get the motor rebuilt with "steel parts".

Now, the 4G63 in our cars is much more fortified than those cast pos's back in the day, and I've asked this question before, and its been covered BUT never got a very good response.

I see AMS has a GT30 on their car and making 505 at the wheels on pump with ARP head studs, an EMS and UEGO and a good tune....Im guessing that motor is good for 30k miles, at best....am I optimistic or pessimistic? If I dont ever have to rebuild the motor, I wont...but it'd be nice to know. Any input?

 

How can you guess something like this? It could last as long as they take care of it. A better question might be... if they kept the motor at redline, how long until it blows? You can't put a mileage guess on a motor, too many factors.

BTW, I hope my GT30 (3037S) does 505awhp on pump

 

that was on race gas

 

I know it was on race gas. Guessing output is a hard thing to do, so lets go backwards and analyze the Evos stock config. Normal driving, that is a 100k motor. Increasing its power by 50%, does the life of the motor equally dissappear as the power goes up, i.e., 50% power increase =50% life decrease. Im asking those with high output stock motors. You dont hear too many stories of dead motors except bad tunes and worse drivers or parts, so its just a question for experience, not speculation.

 

Greater power = greater heat

More frequent use of greater power = longer exposure to greater heat = faster wear

Improper tuning = worse heat, accelerated decrepitude


Of course, with modern ECUs and competent tuning, accompanied by generally better quality engine hardware, combustion efficiency and durability is much better than it was in the days of carburetors, distributor points, and other comparitively crude tools. The recommended spark plug change intervals on at least one car is 100k miles. Imagine trying that with a 30 year-old car...the motor would need a rebuild after going that distance. How long will an EVO making big power last? There is no equation that provides a reliable answer beyond that derived from common sense.

In any case, the age-old adage holds true that speed costs, and not just on the front end of the equation if you get what I mean.

 

I had an Audi A4 with 300whp (150 crank hp stock) for over 50K miles and that was becuase I took care of it. Each case will be different.

Mike