Did they make an 80mm cover ever?

I only remember the stock cover and then this ported shroud cover?

 

Is this really worth it on a stock IX turbo? Will it help out someone that is compressor limited at altitude (3000ft)?

 

I think it'll be worth it simply because of the possible HP gain and the possibility it may be helpful with traditional surging on stock turbos on low rpm pulls.

I dont know how many of you have this problem, but I feel the compressor housing MAY help with this. For instance, if you're going 60mph on the freeway and simply floor it while still in 5th gear, the turbo will surge (car will buck). However, if you're at 60mph and downshift to 3rd and go WOT, the turbo will not surge and the car will perform normally. I have noticed this in multiple Evo's running the stock IX and even on a BBK. I believe the FP comp cover was made to supress this issue.

It would be great to have some feedback from people running IX turbos with this compressor cover to see if this helped with similar issues.

 

Yes, and shortly after the 84mm came out.. am just thinking of upgrading to a FP Black all together now.. but would love to have a 84mmcover from the beginning..

 

AFAIK, there is only one peep running this comp cover on a IX turbo....and he is located in the State of Washington incidentally. If you think about it there could be a possible horsepower increase if the car was set up MAFless with SD and a 4" outlet on the airfilter and a 4" intake tube.

Aside from a 4" inlet system with no MAF restriction being capable of flowing higher CFM's than a MAF setup, there might be a difference when transitioning to WOT as there would be a larger "resident" volume of air already inside the larger ID inlet at the instant you floor the pedal and the throttle plate opens.

 

Good analogy, Sparky. Do you know who it is by chance since I live in WA? I'd love to pick his brain about it.

Im actually on SD at the moment and your post makes sense. Looks like I'd be in position to make the most out of the cover.

 

This is an older thread, but the bad info is driving me nuts!! People keep saying the compressor wheels between 8/9 turbo's are the same. I know my eyes aren't what they used to be, but lets see if the attached link works & everybody can have a look at the two compressor wheels side by side..

https://www.evolutionm.net/forums/en...rbo-specs.html

 

They are the same.

That picture looks a bit deceiving since it's taken of different blades, It's also a comparison of the mag. vs al. wheel...maybe the mag wheel is a bit different??

If I'm wrong, I would love to be corrected.

 

Edit:
Ha, Gearhead beat me to it.

 

"For better response we increased the diffuser size..."

Look at the pic with the 2 wheels side by side. It's plain as day to see the difference in profile between the two wheels.

 

I received my FP compressor cover for my IX turbo last week. Throwing this on with a JM Fab 4" intake. Im going to post a full review with dyno results with these two mods alone to show what the compressor cover and 4" intake does. Im eager for the results, this compressor cover has "sweet sound" and "nice gains" written all over it (not literally ofcourse).

 

That's the exact picture I was refering to in my prior statement.

 

What sweet sound are you referring too?

 

Some people have actually taken off the compressor covers of both turbochargers and measured the wheels. Consensus is, the USDM EVO VIII and IX have the same compressor wheel.

That turbo you are pointing out is the magnesium wheel version, NOT what we get here in the USA. It could potentially be a different size (pretty sure it is not though) and it would still have nothing to do with the USDM IX turbo.

Besides that, you can clearly tell the pictures are taken from different angles/distances so the scale is skewed. Also, the diffuser is part of the compressor HOUSING and not the compressor wheel. Increasing the diffuser means absolutely nothing when talking about the compressor wheel. It simply means they used a larger compressor cover, similar to a T04B vs. T04E.

 

The diffuser is partly the compressor housing and partly the back plate which on Mitsy cartridges is part of the bearing housings casting .
The 9 turbo appears to use a different center housing meaning without modifications the 9s compressor housing won't go on an 8 or earlier Evo turbocharger .
No doubt the variable cam timing compensated for any low speed power issues and allowed them to use the larger diffuser section which is supposed to help increase a compressers thermal efficiency .

A .