I finally installed my XEDE in the Evo this morning. Except for removing the pill in the solenoid line, the install was very easy. I started the car and everything seemed fine.

I then installed the new, colder plugs. I restarted the car, but the idle seemed choppy. It was fluctuating about 100 - 200 rpms. At about 3,000 rpms, it sounded like it was missing. I removed the plugs and reinstalled the originals. The idle did improve, but it was not great. I gapped the colder plugs at .28.

I took the car for a short drive to test out the XEDE. The boost starting going crazy. It would jump up to 20, drop to about 14, then jump back up to 20. I was sure I had a leak somewhere. After stopping the car for a short time, I tried it out again. This time it held 20 lbs up to 7k rpms.

Any idea what could have caused the boost issue? The DV didn't sound like it was leaking. I thought I may have punctured the boost solenoid line, but it's holding boost fine now. Does it take a while for the car to adapt to the XEDE settings?

 

i didn't have any issues with the boost...i do have the choppy idle...i plan on making a grounding kit....and seeing what that will do

 

Anytime you reset the ECU its gonna act like that for a day or so. Give it some time and I bet it clears up.

You did re-set your computer didn't you?

 

this is prolly a stupid question...but is there another way to reset the computer besides removing the battery leads?

 

Well, yesterday I finally put my Xede on, but I didn't run the boost control option.

A couple of notes of interest.

1. I didn't splice into the harness to run the boost control function. But I did have the blue lead attached to the brown lead. I also had the grounding wire attached. As I drove around, I heard this noise emanating from the Xede area everytime I would drive the car into positive boost. The best way to describe the sound is like tearing paper. Supposedly this is 'normal' but I found it to be pretty intrusive. Do you guys get this noise?

So I called, and spoke w/ Brett and he informed me to disconnect the 2 wires, which I did. No more noise. But I don't know if I could put up with the noise when I do decide to run the boost control feature. Do you guys really notice this noise?

2. At cold start-up, there's a slight 'miss'. You can easily hear it. But this ONLY occurs at start-up w/ the engine cold. When fully warmed, the idle is OEM steady. I think that the Xede is trying to adjust the timing during the open-loop cycle of warmup. A couple of guys have mentioned this as well.

Shiv, is there a way to work around this?

3. Like everyone has mentioned, the addition of the Xede has really smoothened out the power curve.

As for the ecu reset question: I would think that by removing the harness from the ecu, you're performing a reset.

 

hmmm, glad I waited.

 

Hi there,
First thing to do is to regap the colder plugs to .024. Yes, that's small but much bigger and you will get misfire. Or you can simply run the stock plugs if you'd like. As for the boost issue, you probably have a leak. I'd tighten all the clamps-- especially the one on the pressure side of the BOV. There is no learning as far as boost goes when controlled by the XEDE. It should be rock solid and consistent time and time again. You might want to check your ground as well. If it's flakey, boost will be flakey as well.
my 2c,
Shiv

 

Did you have the ground installed when you heard the tearing sound. If you didn't, that would explain it. With the ground installed and the XEDE controll boost, the little relay mounted on the XEDE harness board will click. This is necessary for CEL light surpression. Most people (including me) can't really hear it when the XEDE is tucked away behind the glove box.

As for the idle miss when cold, we isolated the issue to MAF replication stability. One of the things we do with the MAF signal is to filter out the short term spikes and dips in the signal. It's one reason that an XEDE'd EVO drives smoother than a stock one. For idle, however, there might be too much relative filtering because the signal is so small in the first place. We're working ona firmware update right now. Once ready, you guys should be able to update your XEDE at home with the XUpdate software.

Hope that helps,
shiv

 

Shiv,

Thanks for the info. The car ran great this afternoon. The idle seemed normal. The boost is holding at 19 - 20 lbs. I'll regap the plugs and try them again. I'll also check the clamps. I can't wait to install the Signature Turboback. I'm hoping to install the cam gears before Oct. 25. If everything comes together, I'll be attending the BM Tranny tuning session.

Is the factory DV still holding boost in your red Evo? I've been thinking about replacing mine with the Pruven piece.

 

mhgsx,

I don't hear any XEDE noise with the boost control hooked up. I haven't even noticed any of the clicking sounds that have been mentioned by other people.

 

Shiv,

That idle fix would be great...keep us posted...

 

any word on the idle fix?