This is why you have been the most respected vendor in this and the dsm community for so long.

 

IIRC, the wheel is machined. Is it possible that minor variation in the machining process is causing the difference?

 

I 'm believing this maybe the problem....

 

That is how it should be.

 

Just wanted to clarify a few things, because I didn't document this very well (Kinda kept a few secrets.. sorry guys)

My 10.5 housing is an EARLY housing, the actual flow potential of both housings is identical from new to old, where the new housing is better is by siamesing the two ports together, you have a merged flow which results in less turbulence which should result in improved flow out of the O2 housing, this is the one and only benefit of using a stainless O2 housing over the stock O2 housing is the chamber is bigger that its not as affected by it.

My compressor cover is a 2005 JDM Evolution MR cover, its casting is ever so slightly different and its scroll chamber size is marginally larger (nothing worth mentioning that would be worth any real power gains). The turbo on my car is a STOCK '03 CHRA with these components, I have another TME turbo with these components and other secret sauce that I have been sitting on waiting on results of this turbo.

The GM BCS is installed in a manner identical to how you would install an MBC, as Al (Dynoflash) stated, the stock BCS system is a bleed system, when the boost levels go higher than what is designed, you have restrictors and a bleed valve (your stock solenoid) The restrictor at the boost source is basically like setting an MBC for 17psi, the second restictor at your solenoid sets the 19.5psi setting, the solenoid just allows the air to bleed through that second restrictor. Vacuum line size and restrictor size will affect how well the system works, altering the location of your vacuum/boost source, the restrictors, will affect how this system works. WHen you begin using higher boost levels, you get more pressure in those lines and at a certain level, the bleed system just can't bleed off any more pressure and the boost begins to taper. The Vishnu boost tube, and the UTEC's adjustable ABC are both supplimental bleed vents, which will raise your boost a little more, unfortunately its still a bleed system which can become overrun. Additionally, utilizing the stock BCS system but altering the restrictors or bleed system, increases or decreases the level where your boost control happens, but doesn't in any way help the range you have to work with by very much.

A restrictor system like a MBC or closed loop EBC, basically closes off the flow to the actuator until a preset level is set, then it opens it and allows the actuator to open. The spring pressure inf the actuator, and the preload are what keeps the flapper closed.. ANY MISADJUSTMENT WILL RESULT IN POOR PERFORMANCE, too tight and it'll spike then taper, too loose and it'll never give you your desired boost levels...

What does all this mean? You need to verify the preload of your wastegate, and you need to have more control than what the stock BCS can offer if you want good results.

If you have a stock ECU with a reflash, you NEED AN MBC or EBC.. If you have an EM unit that can control the stock solenoid YOU NEED TO UPGRADE TO A PERRIN or GM BCS..

Now back to your regularly scheduled program...

 

Here are my feedbacks on the WR turbo:

Replaced my TME turbo with the FP WR and Gained 1.2sec. at MSR.

To me, that's a huge improvement!

 

This is off topic but interesting. Just wante to let you guys know there is already a used WR turbo for sale in the private f/s section. Only has 100 miles on it. There is also a 50 trim kit for 150 bucks more

 

this is a drivers turbo. this is a turbo for people that want fast spool, a mean responsive turbo that can kick *** in on tight courses AND hold some ground on high speed courses. this isn't the OH i'll slap on a gt35r and gain 100 hp. no... no no no no NO. this is NOT THAT. so don't look at it like that... yer gonna hurt its feelings this is a drivers turbo. this is a turbo for people that want fast spool, a mean responsive turbo that can kick *** in on tight courses AND hold some ground on high speed courses. this isn't the OH i'll slap on a gt35r and gain 100 hp. no... no no no no NO. this is NOT THAT. so don't look at it like that... yer gonna hurt its feelings

"A drivers turbo eh"?

Kind of like the emperor's new clothes?

What does that have to do with the 441 whp cpacity which was claimed on a evo with no cams and stock intake ?

 

Very very offtopic.. But the WR turbo will require nothing more than gaskets and studs for an install, the 50 trim will require $1000 or more in parts to install it, plus a custom O2 housing and/or downpipe and lower intercooler pipe.

Please we need to keep these offtopic posts to a minimum..

 

I concur 100% with your take on this

 

I didn't want to say anything earlier about this turbo because I really want to see results.. But the one thing that I saw on the WR turbo was no attention was paid to the EXDUCER AREA of the casting, The slot, chamber (where the boost accumulates), and the discharge, and the DISCHARGE TUBE TO THE INTERCOOLER are still the same, this to me could restrict its potential efficiency and flow.. I'd like to see one with the chamber and discharge enlarged slightly, more efficiency would result in more dense air at slightly lower boost, but only if it can get out of the turbo, otherwise you just heat the air more at the compressor wheel and transfer slot.. <edited for typos>

 

Sorry, but the kit includes all ot the above.

 

pm Me the link, I stand corrected if the kit came complete with the manifold, wastegate, and all the parts needed for install.

 

and in reality, if you can maintain boost pressure within the turbo's efficiency through a higher RPM, where your able maintain torque through a higher RPM, you can in theory produce those horsepower numbers, but I see some efficiency things that customer cars may be lacking that the Swytzer car had.. Boost control and leaks being one, the stock MAF being another, the ignition system is a much bigger contributor than many people actually realize also.

 

For those concerned about boost taper WORKS seems to handle it well with their flashes as evidenced by posts here: https://www.evolutionm.net/forums/sh...hreadid=144301