Sean, you didn't hit a nerve or anything. I just was curious about the XEDE. I didn't know anything about it until now. (Still don't, to be honest)

Statements in blue taken from the Vishnu website:

Additionally, XEDE users can define not only their own Load and RPM breakpoints for each map, they can also determine which Load variable to use (TPS, MAP or MAF) in order to best achieve their specific tuning goals. Simply put, no other form of engine management offers this degree of tuning flexibility

What does that mean? Ok, I know that for my fuel tuning, it's part TPS load and the rest MAP load. I don't even fully understand what that means, let alone being able to choose which one I want to use. What's so great about using MAP vs. TPS? Is it because MAP is affected by the surrounding weather conditions? How are MAP and MAF different as far as tuning? From what I understand, MAF is pretty inconsistent. TXS has even stated that they are trying to move away from using MAF as a factor.

As it stands, for fuel and timing the UTEC uses TPS for load 0% and MAP for 10%-100% load. It uses TPS throughout for boost. Seems pretty straightforward and easy to me.

One of the most innovative features of the XEDE is the ability to influence closed/open loop fuel control transitions. This is elegantly accomplished by mapping a revised throttle position signal (TPS) with respect to actual TPS and engine speed (RPM). Using this approach, it is possible to induce open-loop fuel control switchover under the conditions you see fit.

Sean, did you feel any transitions between open and closed? Open being pretty much anywhere between 0-1000rpm and 0-60% boost (0-10 lbs). When my ECU is controlling, it's open-loop. When I'm in my map, I'm in CLB.

Compared to the Unichip, the XEDE is capable of vastly superior CAS replication. This ability greatly improves active knock correction performance, general drivability and invisibility to the factory diagnostic system. Perfect CAS replication insures that there is absolutely no misunderstandings between the factory ECU and the XEDE.

Huh? What's Crank Angle Sensor replication? Is this addressing the problem that the EMI was designed to fix. Again, I don't know if I have this problem, but as far as I know, I don't.

When I shift aggressively, when Sean did, and I guess Richard and many others over at wrxhackers do; a few knock indications show up. Best opinion that's been kicked around is that it's the additional noise from driving hard.

Unlike the Unichip which is capable of modifying only Ignition Timing and MAF signals with fixed load (MAP) and RPM) breakpoints (every 500RPM, the XEDE is capable of modifying Ignition Timing, MAF, TPS, MAP and Knock sensor signals with respect to RPM (up to 20 user-definable breakpoints) and any one of three Load variables (MAP, TPS or MAF).

So does the UTEC, I think.

It has Internal storage space for up to 12 tuning maps but only 'Map Select' input to change between one of two unique tuning maps

The UTEC has 5 plus 1 (valet) and can swap between any on the fly (easier with the remote switch). No big difference, here, though because I for one mainly use one, and if I switch, it's usually to only one other map.

The XEDE doesn't have knock correction. Shiv says that the OEM knock correction is the best that he's ever seen.

XEDE = $795 plus software for $100. UTEC = ~$990.

The UTEC has a built in programmable solenoid controller. It can control nitrous, water injection, intercooler water spray or any other solenoid device. I didn't see where the XEDE could do that.

I don't think that the XEDE can datalog.

My biggest gripe with the UTEC is the lack of a tuning 'handbook'. The Instructions are great; I've read them no less than 5 times and read within them countless times. I must be a rock. I know how to tune my car to be 'safe' without a dyno, but I have no earthly idea how to tune aggressively to get at that 273.8 whp @ 6047 rpm @ 17.0 psi.

Please educate or correct me as necessary.

Pat

ps. Why doesn't my signature ever show up?
FWIW, here's mine
Airborne Ranger, Airborne Ranger where have you been?
Deep into Baghdad and back again.

 

The XEDE can datalog

To be honest they are both good. I like the XEDE for it's software :P But the UTEC for it's additional features..

The UTEC has injector drivers built in. High impedence, low impedence, it doesn't matter. Can't do that with the XEDE.

Convert to MAP, now that is a big thing for guys that want to run high boost and HP. Again XEDE can't do that.


Obviously the UTEC has more cool features... But really half dont really exist. I still feel that the UTEC could have waited 6 months or more before coming out to work out all these things and include them rather then string people along with "with a software update, you can..."

But keep in mind that Shiv has some things up his sleeve too that he will unveil at a later date. You know "in shiv time." Just like the UTEC with it's initial feature set, the XEDE will be the same way.


Eitherway, THEY ALL SUCK! LINK RULES!

 

Oh and the XEDE does have a plethora of outputs and LED output circuits.

 

AEM oWnZ!!!

where's you get your info on the XEDE?
I believe Shiv has told us the XEDE will do all of what you said it wouldn't do, ... and as the UTEC, it will have upgrade oportunities. (of course, I could be off my rocker and be mistaken)

 

http://www.vishnutuning.com/xede.htm

 

boy Pat, ... you are really going to make me work on this one aren't you!

Ok, from what I know, the "breakpoints" on with the UTEC are always the same, i.e. 500, 1000, 1250, 1500, etc(whatever they may be). Being able to define the breakpoints yourself can yield better idling(if say, you have Big injectors), or maybe to help out somewhere else in the map that you may want more 'resolution'. The benefits can be yeilded in different ways, but I think you see what I'm saying.
As far as MAP vs MAF, think of it like this MAF sucks, MAP doesn't. j/k ... simply put, MAP is reading from a sensor from your manifold pressure, MAF is that POS that restricts your intake and gets it's readings Before the turbo, where as MAP is reading the 'true' amoount of air in your intake.


well, I'm not sure what I felt when I drove, I mean I didn't really have much time to think about it (you're always so scared to let me drive your car! I have no idea, I get the impression you think I'm a nut or something, .... we need to take some video of you driving! ) The hesitation and knock we got when I was shifting could be for a few reasons, maybe because boost dropped, then it's in open loop for a second until boost builds? Boost spike? I doubt it, you are running super low boost right now. I dunno, all kinds of things could cause that, again, I'd need to work with it.
Maybe by keeping the ecu in closed loop, you could fix that problem?

...

 

con't

I assume that's talking about the XEDE sending the ecu a 'cleaner' signal than the UTEC can, ... meaning a truer representation of what's really going on in the knock department.

As far as the problem I felt the other night, I don't think it had anything to do with additional noise, and the ecu definitely pulled timing. I really think there was less 'noise', or shock, when I shift compared to when you shift.

I didn't think it could.

well, it was already said, but yes, the XEDE has all the bells and whistles too. The software is Much nicer IMO, I would hope it performs much better than the UTEC too, from the looks of it, it will.

Anyway, I will try to find time to complete the WBo2 this week. I know it's frustrating trying to get this stuff right, I honestly wish I had more time to help. And unfortunately I can't afford to get the stuff I want, or I would have much much more hands on experience, that's one thing I always fall behind in b/c of lack of funds.

anyway, its really late, and I'm tired, so I don't know if I even answered all your questions correctly, let me know.

Sean

 

Lack of funds?

Any dough you drop into it, I was planning on paying you for.

Great responses, though.

 

so you'll pay me to mod My car!???

that's what I'm talking about, buying stuff for MY car, and gaining experience that way. If I could have afforded it, I would Already know how to tune everything, ... and I mean everything.

 

I meant for the WBo2.

 

yeah, but that's not what I was talking about ....