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If custom tuned, the Stage 1 XFlash will provide the same power as the Stage 1 XEDE/XEDEFlash combo. Just different means to the same end as far as engine control goes.

Cheers,
shiv

That seals the deal. I'm going with XFlash, and I'll just wait till the next time there's a dynoday (east coast?), and get a custom tune.

 

I went to bed a long time before you, but I have some things to add :

1) I have a third party dump-back exhaust. This could've skewed my XFlash results because I am catless. You will notice that even with a stock car when you remove the catalyst and the OE dual flap muffler that boost pressures will drop a couple of psi. This is my theory as to why my car fell off boost so badly. The best way to prevent this is to isolate differences: IE- Use a Vishnu exhaust.

2) I had an early inline restrictor that went to the BCS. It has since been changed. The problem is simple- No two cars are exactly the same. Your XFlash might hit 23psi and taper perfectly to 18psi. Mine did not.

I am, however, totally confident that you can get it to work like you want it to with a little bit of input from Shiv and tweaking.

No matter what, don't use an MBC with an XFlash. You'll lose that killer midrange punch without it, and its such an awesome part of the whole experience.


Regarding Shiv's direct quote above, I never disputed that the maps are basically identical. I said that the boost control is different. If you have a Vishnu exhaust, then you already have a big factor correct that I did not.

 

Now I'm confused (maybe a lack of sleep on my own part). Working against a larger pressure differential why doesn't the open loop Evo make greater boost with a free flowing exhaust?

 

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Now I'm confused (maybe a lack of sleep on my own part). Working against a larger pressure differential why doesn't the open loop Evo make greater boost with a free flowing exhaust?

Good question, I thought that too. I didn't know gutting the cat would cause boost to drop. I have the stock cat in my car still too.

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Regarding Shiv's direct quote above, I never disputed that the maps are basically identical. I said that the boost control is different. If you have a Vishnu exhaust, then you already have a big factor correct that I did not.

See, I was under the impression that the boost maps were the same between the two (as indicated by the stock XFlash/XEDE graphs stickied here). I thought it was that XEDE had the potential to be more powerful, because with a XEDEFlash it can exceed 24psi, but that is probably more than you'll want to run to redline on the stock turbo anyway. I figured for a Stage1/Stage1+, which is probably as far as I'll go, the XFlash should be able to handle the boost. If you are shooting for Stage2+, with a new turbo, then the XEDE will be crucial for adjusting boost. At least, that's what I thought.

 

No. They control boost completely differently. The XFlash control is identical to stock control, except Vishnu supplies a line with a restrictor that replaces the bottom third link of the WGA/housing tee. The Vishnu line goes from this tee to the BCS. So the ECU is still controlling the boost. The XEDE circumnavigates the ECU completely. The XFlash control is alright, the XEDE is self contained and therefore much better.

Shoot, I wish I could show you. I felt EXACTLY the same way you did until I played with both in real life and saw a lot of cars on the dyno.

 

That's a great question that I do not know the answer to. Every other turbo car I had before this one generated the opposite effect whenever exhaust components were pulled. Its definitely an Evo thing, though.

 

Oh right, I understand the XEDE uses it's own solenoid - what I meant was that the values that they boost are theoretically the same, at least for stock baseline maps (according to sticky). I don't know if the boost values change as you go through the stages though.

 

This is a frustrating conversation.

My boost values on the **baseline maps** for the XFlash Stage 1 were nowhere near as stable (fell off a lot harder) than my XEDEFlash Stage 1 baseline map, even before tuning.

What I have always inferred is that I don't have a Vishnu exhaust. If you do, then you're ahead of me in that game. What exhaust do you have? In my case with the XFlash on my third party TBE, I'd ramp up to 23psi then gradually fall to 14-15psi by my gauge. With the XEDEFlash-even on the baseline maps before any tuning- I always hit the intended boost values. YMMV.

At this point, the best thing for you to do is to try the XFlash out for yourself and see how its boost control works out for your car. I hope it works awesome for you, bro!

 

Hi guys, I got back from the dyno, made 333whp after tuning w/ Xflash stage1+ thanks Shiv! I will scan and post the sheet when I can. Boost peaks @ about 23 psi and tapers down to about 17.5 psi. I have no cat and don't have a Vishnu exhaust, YMMV.

 

Interesting... I wonder if a tuned XFlash on your car would have provided better boost?

And I actually have a JIC catback with a HKS downpipe... well, he's got a 30 day money back guarantee, so I might as well give it a shot.

 

Wow, awesome!. 91 or 93 octane?

 

i'm thinking about sellimg my xede.if any one want's it pm me.we'll talk about price.

 

dyno sheet posted on the nj dyno day thread. btw zstryder: 93 octane amoco ultimate

 

Hm, I simply assumed this but the webpage on the XEDE never actually state is, but the XEDE can do logging, correct? What can it log?