Vishnu Tuning Dynoed Evos

[JimDab]

Quote from Shiv posting at EvolutionM.net forums

The three US EVO VIIIs we've tested (under nearly identical conditions) put down right around 180 wheel hp. That's only ~20 more wheel hp than a stock WRX. Hence my concern about the 271hp rating. Thes dyno figures would suggest closer to 255hp, IMHO.

A few interesting findings:

Peak hp occurs around 5500rpm, not the claimed 6500rpm. Peak torque is right around 4000rpm.

One of the three cars we tested ran 2psi less boost (17 tapering to 15 vs. 19 tapering to 17) than the others. It had a one month earlier build date (1/03 vs. 2/03), FWIW. It ended up making the same power as the other two higher boosting EVOs but with slightly less torque in the low end and midrange.

Our EVO VIII, for some reason, only has a 1bar MAP sensor. Strange seeing it in a turbo car that runs 19psi of boost. I would expect nothing less than a 3bar unit for the car. With the 1 bar MAP sensor, it maxs out (reads a full 5v) at 0psi of boost. Bizarre and pretty useless, as far as I can see. While I didn't check the other cars we tested, I suspect they are similarly equipped.

The car is especially knock prone at certain engine speeds. At least it is on the lovely 91 octane gas we run in CA.

The car runs a frequency-based MAF sensor. Not the usual 0-5v types seen on most other cars.

The car is under-advanced above 5500rpm. Adding just 1-2 degrees of timing at high rpm bumped hp by over 10 wheel hp without any detectible knock.

The EVO VIII's factory ECU is a bit more sophisticated that the older EVOs which had no type of active knock correction or smart ignition learning capabilities. Even the processor on the board is bigger These new ECU smarts will present more complications on the tuning end. But that's what we do so we consider it a challenge.

The EVO, like the WRX, is suseptible to MAF misreadings through intake modifications. We measured some pretty wild MAF errors when trying out different intake configurations.

There's a lot more info we've dug up during our tune-a-thon. Some of it we'd like to keep to ourselves for now and some we'll elaborate on on our website (http://www.vishnutuning.com/lancer.htm). There's nothing there right now but a pretty picture. Give us a couple of days and it'll start filling out. It's past midnight and we just came back from our first test drive of our mildly tuned EVO Lots more info to come....

Cheers,
Shiv
www.vishnutuning.com

PS. As mentioned earlier, all testing on all EVOs were done on 91 octane gas. I did test our car with slightly higher octane (by mixing in a couple of gallons of 100 octane) and found significant gains (6-9 more wheel hp). But still shy, IMHO, of the factory's claim. I think the car's short gearing, great turbo response, and strong midrange torque make it feel quite a bit more powerful than it really is. Still an awesome car. And it's bound to get only better as we get a handle on how to make more power safely.

PSS. Also, keep in mind that these numbers are from our Dyno Dynamics dyno which, while arguably more accurate, reads more conservatively (lower) than Dynopacks and Dynojets. While it's the best dyno for tuning, it's not the best "big number generator" that some people like

OWNED



This is WRX vs the World right? I can post competitive posts now can't I?

[lambosv21]

damn thats sad ....funny owned w/ the price tag though

[JRod]

Damn, pretty dissappointing for a car running 19 psi with a higher compression ratio. Just proves that factory power claims mean nothing. Nice to know I can have about 280 AWHP at 17.5 psi for well under 30K. To get equal or better handling though I'd be pretty close in $$.

[is2scooby]

Wow. The Dodge SRT4 is going to be spankin' Evos on a roll.

I'd hate to see the guy that pays $50k for that Evo roll up on a $20k SRT4 late one night.

[JRod]

Holy cr@p, I didnt even see the dealer's asking price. Please tell me thats a joke, seriously.

[lambosv21]

sadly its not a joke...there are people that dumb on this planet

[stealth_rex]

Only 20 whp more than a stock WRX? Hee, hee. Does this mean a TurboXS Stage 1 might be enough to take out an Evo?

[NJwrbT-WRX]

In a straight line a MBC and a good driver will be enough if you ask me.

-joe

[ebr0t]

2nd pic is a red X. i wanna see what shiv and them get when they run it at the quarter.

[dukmahsik]

tisk tisk so many evo haters on here its hilarious. the evo is in a diff league than the wrx. thats a quote from vishnu

[ebr0t]

Originally posted by dukmahsik
tisk tisk so many evo haters on here its hilarious. the evo is in a diff league than the wrx. thats a quote from vishnu

different league? hardly. better then yes. but i think different league is a bit of a stretch.

[dukmahsik]

Originally posted by ebr0t
different league? hardly. better then yes. but i think different league is a bit of a stretch.

like i said EARLIER, that is a quote from Vishnu. Here is the complete text:

"Hello Guys,
We have dynoed 3 Evos so far and they are all making within 3 horsepower of each other. We are dynoing another one on Tuesday and will release the results shortly thereafter. The car is a fantastic driving machine and is in a different league then the WRX dynamically for sure. Take care guys.

Brett Payne
www.vishnutuning.com"

and link to the thread since the it was forgotten:

http://forums.evolutionm.net/showthr...5&pagenumber=1

Vishnu goes on to say that they got 30whp from doing minor tweaks and staying completely stock and the gas in CA was a huge factor. Read the thread before u make assumptions

[jt2]

I'd say that Brett's statement is probably right, that DYNAMICALLY they're in a different league.

That is to say that the driving experience is likely quite different, given the better suspension, brakes, etc.

Almost excatly like the difference between the vanilla WRX and the STi is likely to be - which is the proper car to compare the EVO to.

[JRod]

Originally posted by dukmahsik
[BVishnu goes on to say that they got 30whp from doing minor tweaks and staying completely stock [/B]

that quote = oxymoron

How the hell does doing minor tweaks that yields 30whp = staying completely stock. You can Ecutek a stock WRX for the same HP. But I wouldnt call that completely stock.

[dukmahsik]

Originally posted by JRod
that quote = oxymoron

How the hell does doing minor tweaks that yields 30whp = staying completely stock. You can Ecutek a stock WRX for the same HP. But I wouldnt call that completely stock.

shrug ask them not me, i didnt state it. to them i guess stock is not adding any perf parts and only using what came stock. aren't their "free mods" for wrxes?