Mitsubishi's all new 4B11T engine in the Evo X has proven to be something special. I've had some great first hand experience with it, and I'm still amazed every time I drive the car. For the past two seasons I've been racing my car all over the US, starting with a brand new car to where it sits today, a 500+whp, 2,850lb. track car. The car has seen many changes...suspension, turbos, fuel type, weight, etc. But the one thing that's remained is the stock Mitsubishi 4B11T engine. It's been extremely resilient, even after 8,750 track miles it's not showing any signs of fatigue. That says alot about the new engine and it's design, but it also goes to show how the right choice of parts and tuner really comes into play.
AMS Performance has been preparing my car since day one, with their bolt-ons, tuning and general maintenance of the car. Road racing requires alot from a car, especially the engine. The engine is running wide open for 20-30 minutes at a time, with all the heat building up things can really go wrong. That's where the right parts and proper tuning really matter. With AMS' parts and tuning, my car has been exceptionally reliable, showing no signs of failure. Even now, with AMS' Prototype Cast Manifold 750R Turbo kit on the car, it's just as reliable on track, every time. The car is making well over 500whp, running upwards of 36-37psi, even revving to 8,200rpm and the stock engine just keeps on running as if it were stock. The 4B11T revs so smooth, even with all the power and we've added, some of the time I forget to think about it on track! There's no weird noises, no sputtering, no knocking, it just runs like new...but with alot more power!
I'd really like to thank Mitsubishi for building such an incredible engine in the 4B11T and AMS Performance for safely extracting so much power out the 4B11T. Reliability is so huge in racing, if you can't focus on the track because you're constantly fighting issues, you will fall behind. Luckily with the 4B11T and AMS Performance, I've had great success with the car and look to continue moving forward.
Video: The car on track, getting completely thrashed on in 97˚ heat:
Here's the latest graph - AMS Prototype Cast Manifold 750R Turbo kit on E85 Track tune vs. Stock
This is roughly the power level I'm running my 7-bolt 4G63 at and has been about the benchmark for what is said to be a safe limit for the stock bottom-end: about 420whp on dyno dynamics or just under 500whp on dynojet. Hopefully the 4B11T can continue this benchmark (or higher) for a reliable DD. There's something to be said about almost 9000 race/track miles on the engine, that could really be considered at least 50-60k DD miles fairly easily. The only thing it doesn't deal with is the frigid MN cold we deal with on a daily basis, but frankly IMHO if it can deal with the above abuse then it can make it 10 MN winters as a DD.
Thanks for the data Ryan! Hopefully we can see more like this
Re: 4B11T: Gates311 pushing stock longblock way too far
sweet stuff and good to know how great the Evo X can handle it. That is ALOT of track time on that one engine with that much power. 4B11 is quite the solid engine!
Re: 4B11T: Gates311 pushing stock longblock way too far
He is good at driving that thing. When you going to get yours to the road course? When we wen't there was a woman that goes to BIR all the time with her Evo and says the car is meant for it. She has not had any issues either. Not sure if her car was modified though.
__________________
Life's tough.... it's even tougher if you're stupid.
7/25/09
Motorcycle cop pulls up next to me on UNI and says "Want to race?"
Me- "I don't think you would stand a chance."
Cop says "probably not" and drives off.
Last edited by slowbubblecar; 08-12-2009 at 10:27 AM..
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