I was looking at Vishnu's forum (his website) and an EVO 8 owner posted that he was getting a "Service Engine Light" due to XEDE. The question was ask a week ago and still remains unanswered. Are any XEDE users getting any warning lights?

Am I reading correct that a Vishnu turbo back exhaust and XEDE with 93 octane map can yield an additional 25% hp? Also, the installation of the XEDE requires the "intersection" of 2 ECM wires. What does that mean? Cut and splice? Put the XEDE in series? Can the XEDE be wired for quick disconnect? Are there any plans for OEM interfacing plugs?

Does anyone have a net increase for the Vishnu turbo back without XEDE? Is the high flow cat really high flow? Is there an O2 bung on the catback pipe? Ok..... I'm done. Thanks in advance.

I like the re-flash, but until they (Works or RMR) can provide local "franchise" flashing, I'm not going to buy it. Wiith the XEDE, I can return my car to stock in a couple hours if I need. I'm also impressed by Vishnu's approach to tuning. (**** is good ).


Speedlimit...

 

I will answer what I can
yes the xede is set up for quick disconnect...it has a small bridge plug so the xede can be completely removed leaving only several small splice wires
I have not experienced any problems CEL's or anything with the xede......I have not read about any problems with this unit either
The wiring is a total of 6 wires 4 ecu wires...spliced, power and earth (ground)
there is plans for OEM interface but will not be available until Shiv finalizes his R&D on the xede
yes there is an o2 bung in the cat back
yes the cat is high flow 3" diameter
I think jfh on this forum saw an increase of 10whp on the altered atmosphere dynojet with the turbo back and no xede
yes you will be able to return your car to stock for a couple of hours or longer if you require
If you do have a serious warranty issue and want to eliminate all trace of the xede .....i.e. trans faliure, motor melt down..and the like
Shiv told me that the entire ecu wiring harness can be replaced for only $300.00 from Mitsubishi....hope this helps

 

Just a FYI on a Dynojet in 90 degrees heat with a very high humidity a Stage 0 EVO (Exde and cat back Vishnu) put down 258hp and 260tq at factory boost settings. Just to compare a WRX with a full fuel system and turbo upgrades were only doing 286 whp MAX. Were on a cold day would have laid down closer to 305 to 310 whp. On a cold day I could see the EVO laying down another 10 to 12 wheel hp and TQ with out a problem. This was on 93oct and Shiv does have maps. The HP and TQ maps were smoother then a baby's rear and A/F were always on the rich side with no knock. Car was smooth as butter to drive. (This would be my 2nd upgrade on the EVO, first would be VII tail lights).

On this dyno a stock evo did 223hp and 238tq (35whp gain and 22wtq gain). Now the EVO also had about 6 to 7 pulls (hot pulls tuning) so with a little cool down the EVO would have peaked about 5hp+ or more.

On a side note I have only heard the Busher (spelling I'm sorry for that) and the Vishnu. Both sound great with the Busher sounding very pissed off (love that). And the Vishnu slightly quiter but still sounds great.

IMHO
Eric

 

Slightly quieter? the buschur turbo back sounds like metal tipped fingers on a chalk board compared to the Vishnu system...buschur is far too loud and metalic for my taste...no comparison in quality and sound....IMO

 

Thank you everyone for the replies. I assume none have seen the service engine light?


Limey,

What is you estimated whp now? The stock clutches apparently start slipping at 300 plus hp. (weak!).

Speedlimit..

 

My whp has been dynoed at 234.7 on a dynojet on 93 octane...with stock exhaust and xede...don't ask it's a long story.....Shiv left it on the safe side as he thought my plugs where too hot when I was at Altered Atmosphere...he has since sent me colder running plugs that I have installed along with his cat back.
so I would say it has a whp now of approx 245-247
I am waiting now for Shiv to send me a better map for my car with the xede and cat back together.. and I will upload to the xede and hopefully it will then be a bit better.
The impressive thing about the xede is the gains found across the rev range...in other words the area found under the power curve on the dyno sheet....the stock power curve had more bumps in it than a post by vivid racing

 

Eric and Andrew-- thanks for fending some questions. I've been on the dyno non-stop this week. Yesterday, we dyno'd what is perhaps the weakest EVO we've ever seen-- 165-170 wheel hp on our dyno which, yes, does read low compared to the Dynojets and Dynopacks that most folks are used to. Still, that's only 10 more wheel hp than most stock WRXs as tested on the same dyno. All tested on 91 octane.

With an EXEDE and exhaust, we managed to bring output to 205-210 wheel hp with stock boost levels above 5000rpm). We did bump boost up in the midrange slightly to fill out the torque curve.

Typically, on most EVOs, an appropriately mapped XEDE has been shown to yield 25-35 wheel hp gains (depending on the other mods) without raising boost pressures. At higher boost levels, the gains can be greater but highly dependant on available octane (stock 19psi is already pushing it on pump gas, especially on 91 octane).

On AWD Dynojets (the dyno most people are used to), Stage Zeros (XEDE plus cat-back) have been putting down around 255-265 wheel hp. Adding our downpipe has been known to bump output up to 265-275 wheel hp. Expect our next batch of upgrades (adjustable cam gears and revised XEDE map-with boost control) to bump output by another 15-20 wheel hp.

Cheers,
shiv

 

limey-- I just emailed the last few XEDE files to my webmaster. They should be posted up (and downloadable) tomorrow at http://www.vishnutuning.com/xede_evo.htm

lemme know if you have any questions.

Cheers,
shiv

 

Cool! When do you expect the upgraded firmware and realtime map switching to be added?

Mark

 

What is the size of the tip on the cat back exhaust?

 

Four inches and polished

 

Hey Mark......is this so you can run two maps? I noticed on the WRX portion of Vishu's site they had a map named "valet" .....if thats what I think it is......that's too funny..let me know of any events going on with you guys in the future so I can do another road trip and maybe get another ticket.....

 

,

Why was the reading so low?? Did it have a bad tank of gas?? was it making the boost??

Eric

 

Shiv - will the Boost control function be ready for the Xede in time for this Sundays tuning at Matrix? Im scheduled at 12pm. I remember you saying that I will be able to hold 19 or 20psi all the way to readline with the Xede and no EBC.

 

also - Ill be using 92 octane, but have very very easy access to 94 octane pump gas here in Washington... So ill show up with 92 octane (depending on where I fill up before Portland) then hopefully you can make a more aggressive map for 94 octane...