Here's one specification that I haven't been able to find anywhere. What is the boost pressure on the Ralliart's turbocharger? I presume, since it uses a smaller single-scroll charger, that it develops less than the Evo's 11.8 psi. I haven't seen this figure in a road test of the Ralliart yet; does anybody know?

 

Hey, im not compleatly sure on the boost but Ive read in pleanty of websites that a stock X does about 19-22 psi at redline....heres a link of one of the pages that tested the X and came out with 22 psi....

http://www.mwir.net/forum/index.php?showtopic=42583

Also, when I was shopping around for a 09 Lancer the sales person I was talkin to told me that the Ralliart should have about 16 PSI but I think he was just trying to sell the car to me lol in my opinoin since the Ralliart turbo is half of the turbo of a X it should be around 9-11 PSI....just guessing.

 

I could be wrong, but I think that the size or the type of Turbo does not dictate the pressure. Granted a big, strong turbo might handle more pressure but you could run a low PSI on both. That said, 16 PSI on the Ralliart could be about right, here's to hoping.

 

I'm guessing around 18-20

 

"The max boost pressure really tells the tale, with the Ralliart seeing 13.3 psi and the Evo pumping 22.4 psi when the hammer drops."

Found this when I was lookin for news bout the Ralliart

URL:http://editorial.autos.msn.com/artic...umentid=643806

 

Thanks for the heads-up on that MSN article, BoneThugs21. Guess I was way off on the figures for the Evo X.

The MSN article is odd in one respect, though. It has this to say about the Ralliart brakes:

"The brakes on the Ralliart are scavenged from the Outlander SUV. Bigger-than-GTS rotors all around join bigger-than-GTS two-piston calipers up front. No Evo-spec Brembo brakes here."

The GTS uses Outlander brakes, too. The Ralliart has the same rotors as the GTS; only the two-caliper engagement for the front brakes is different.

 

evos usually over 20 psi.

 

It's probably completely identical brakes, including calipers, to the GTS, unless they dug into the DSM parts bin. I'm sure the Ralliart could use a brake upgrade right out of the gate. Pads, at the very least.

 

i thought is a Outlander breaks on the RA.

 

Different swept area than the GTS, and 2-piston calipers in the front instead of 1-piston.

 

I doubt the evo is making 22 PSI at redline, most if not all cars lower the PSI levels once the revs get high since the stress on the motor is exponentially larger. I would presume that peak boost is found lower down and it tapers as the RPMs go up. Anyways, I think the evo turbo is a 16G (if it's anything like previous evos). Since the Ralliart turbo is different from the evo turbo, it can't be a 16G. I have a feeling it's a 13T like in the older WRX pushing 13-15 PSI given that it was designed as a nice daily driver and this kind of setup would reduce turbo lag and boost threshold.

 

yes , it does. my IX did 20 -21 peak boost , depend on weather too. And the X supposedly run a little higher PSI out from factory.
You can run safely 23-24 psi on bone stock evo .

 

21 PSI peak boost does not mean 21 PSI at peak RPM, there is a difference. Based on the article provided boost drops to 13 PSI at redline.

 

the boost always drops at higher rpm. so usually they give you a peak boost. because the boost surely drops at higher rpm's always/turbo charged/. Nature of the turbo. The Supercharger will not drop boost , but slower reaching the top boost . depending on the rpm. So the super charged cars give you a peak boost at the highest rpm vs the turbo charged ,where the peak boost comes sooner, but fades away at high rpm
No problem though since the turbo for TQ and the rpm for hp. Also the turbo doesn't take away hp as a super charger does.
The stock X if i'm right peaks around 22 psi and drop's down to 16 psi @ a red line. So they never give you a boost numbers at the red line. The Boost number is always the peak boost.
CBRD find a clever solution or the quick fix to keep the tapering higher. We tightening the waste gate actuator rod 1-4 turns in. That little thing can /dyno proven / make a lots of WHP.
It will be worth to look into that solution, maybe in the RA too.

 

Yep, sounds good to me (albeit a bit confusing, lol). The only problem with holding peak boost for longer is more stress on the engine but as long you don't go crazy, it should be fine and definitely an option. Something that might be an issue is the size of the turbo in the Ralliart, there's not much point in maintaining peak boost for longer if it takes the turbo outside of its optimal operating range.