If one were to get a stroker kit, then the increased displacement would help turbo spool, don't you agree?

 

Actually, people have pushed 420hp out of a stock 7-bolt Eclipse turbo engine before. That is at the wheels, and on pump gas. It is a rare thing, though, and requires a lot of attention to detail. This is at 22psi with a forced performance Green.

On race gas, people have pushed out 500hp to the wheels on stock 6-bolt 4G63Ts. One car, in particular that I know of has run an 11.3@126mph with a bone stock bottom end (pistons, rods, crank, etc...).

 

Didnt I just say 300HP+?

 

My point was simply that the stock EVO turbo does not need to be blue printed nor re-balanced to produce 350HP+. If I misread your post, my apologies.

Speedlimit...

 

Actually, I believe that the red uses a TD06 bearing housing. Not sure about the green. It may use a TD05. Both of them can either use a 7cm or 8cm TD05 exhaust housing. Your option.

The compressor side looks completely different, though. I believe they use a 17C compressor cover.

 

Out of curiosity, what gains are predicted from a "simple" port and clip job? I would imagine a small clip would still spool nicely and provide an extra couple of pounds of usable boost..no?

VV

 

The top end power of the EVO is not too bad with just a manual boost controller set to hold 20lbs to redline. The biggest problem we have is the turbo lag. Any turbo modifications done needs to address this problem first and formost. Lighter weight rotating assembly and possibly a ball bearing center section. Ceramic coated exhaust housing might help too...

 

If you think an Evo has lag, you would HATE my car. And my car's turbo spools up FAST! And the Evo's lag is virtually non-existant, in my eyes.

Anyway, any exhaust mods you do (especially a test pipe) will help to reduce lag. The more flow, the better. A tubular O2 housing might also help.

Tuning the car right can also help reduce lag.

A clip job basically increases flow around the turbine at the expense of spoolup. And the twin-scroll turbo that the Evo has has a pretty good A/R as it is. I wouldn't mess with clipping.

Porting may help, but I doubt you will see much benefit from it. After 8 iterations, Mitsubishi probably has the turbo housing rpetty well sorted out. One thing I have heard of is that if you switch to an Evo VI exhaust housing, you get larger nozzles, which increases lag, but also increases top-end power.

 

Jesus Christ!

 

While it may be true that Jesus Christ could alleviate the turbo lag, I think He has other things He is busy with...

 

... really though, short of the STI, the Evo is probably the least lag hindered modern high performance turbo car in production...

 

Everyone keeps saying that same thing whenever I complain about the lag. The EVO has the worst throttle response I have ever experienced. I am used to NA cars for sure. I would rather try to improve the throttle response than have an additional 30-50HP any day. I am fairly happy with the power the EVO makes with just the MBC set to 20lbs. Its that lack of torque on the low end I hate...

 

Solution...don't drive with the tach in the low end.