I wonder though, what gear is this in?

 

Doesn't matter what the article says. VIIIs who have installed IX turbos have lost a few hundred rpm spool. What does that tell you?

 

With my gears set at -2/-2 and the mods mentioned in the post, I took the following log from my MAP sensor.

https://www.evolutionm.net/forums/sh...0&postcount=20
(graph and data file included)

My gears are now set to +1/-1, but I haven't done the spool analysis again just yet.

 

tells me they likely reetarded their cams gears

 

yeah i don't understand this. You provided plenty of support that the Evo9 turbo should spool faster than 8 Turbos, but in practice they've all lost several hundred rpm in spool. So your saying the missing link in the few examples of Evo9 Turbos on 8s all retarded their cam gears. This doesnt pass my common sense test.

 

well did they? i'm just sayin that's the first thing that comes to mind. i haven't stalked all the evo9 turboed 8s out there... let's see the examples you speak of and let's see why there is more lag, is that fair? i'm guessing that the reason is for retarded cam timing.

notice with pd1's data (which is the best kind of data, map sensor logged with rpm). he has 264s which should be "torque monster" cams but he has them retarded, look his boost doesn't come on fully until like 3700. does that make sense? the cam gear settings seems to have an effect.

of course there's other factors too, tuning and tuning in conjuction wtih cam gear settings all matters.

 

No, they didn't even have cam gears. I'm talking changing the turbo and nothing else and then retuning - later spool each time. We don't have MANY examples yet, though, so it's a limited data set.

 

in any case, it's not like it'd be surpising... it's running the 10.5 and a larger comp wheel which adds a hair of mass.

but the question is what are you comparing to? a 9 turbo even tme will never outspool a 9.8 equipt turbo.

 

Comparing to an 05 with 10.5 hotside.

A TME won't outspool a 9.8? You sure?

 

most of the tme data comes from teh vishnu camp... they claim 100-200rpm improvement. the 9.8 has about that much over a 10.5 so it just cancels. which is also what the original design description stated.

now with a larger comp wheel and a slightly revised diffuser design, you're prolly gonna break even again. the mag wheel will give a lotta improvement though. a lot meaning again prolly in the <500rpm range.

but think... you're getting all the power and almost none of the spool loss and if you take a bit of a hit in spool it's very little. keep in mind that to this day there's not an aftermarket turbo that can spool faster than a stocker varient and do as well on pump gas.

if people wish to call me out on hype... then i'll say of course i hype it, that's an amazing accomplishment that mitsu has made.

 

100-200rpm improvement?? How can any human feel that difference?

 

I don't think any disagrees on the quality of the stock-style turbos on the Evo. It is a great combo of power, spool, and all-around power/torque.

However, my one problem is you mentioning the magnesium wheel. I thought that was only the JDM version. Don't we have standard internals in the USDM IX turbos?

 

no the dyno does... that's why most people say you can't feel it really. what they do feel is the improvement in power distribution due to the 10.5 after a tune.

 

huh? no, i said if you DON'T have the magnesium wheel, as someone suggested that they may be running in japan due to the failures and having to sort them out, then that's the turbo you want. all the 9 all the ti none of the mag.

 

No, I was referring to your last post where you said,

"now with a larger comp wheel and a slightly revised diffuser design, you're prolly gonna break even again. the mag wheel will give a lotta improvement though. a lot meaning again prolly in the <500rpm range. "

Didn't see any reference to JDM versions or failures or NOT having the mag wheel. It sounded like you were trying to suggest that someone in this conversation was getting a JDM IX, which I didn't see in the context of the last page.