Shiv or Brett,

Me and Andy from Extreme Performance in Downigtown,PA did my xede on my evo.....it ran unreal and got rid of the check engine light....the next mornign i was rippin on the highway and hit 24psi and would dropp to 21 at redline, when i was aproaching redline and max boost a "pop" or backfire sound came from the from of the engine, check engine light came back on, .....then ran like sh**.....unplugged batery, check engine light gone, runs great, im in this patern know for 3 days, i cant go full boost or my car shuts down..it sounds like a bang and the front of the car like throws it self foreward.....but as soon as i unplug battery runs awesome...im upset and need some help please...i waited 5 weeks and 850 bucks and got a slower evo with problems...please contact me by phone or reply to post please!!! thank you!

 

Wow 24 PSI ??/ U must have hit a boost cut ?? I think you should just lower the boost to 21 20 and you should be fine.

 

Troubleshooting

When I accelerate hard, my engine cuts out suddenly for a moment!
If this is happening, the first thing to check is your boost pressure. If it is too high, you may be reaching your boost limit. This is a protection strategy that will activate a fuel cut when boost pressures are too high. With the XEDE, peak boost pressures shouldn’t exceed 20-21 psi. If they are, check the vacuum line that goes to the boost control solenoid (the hose that once held the brass restrictor). Any tears or rips in this line will cause overboost conditions.



I just found that on their website maybe u should start from there.

 

chill man... i posted something on this topic 2 weeks ago, since i had similar problems. it's the colder weather that is causing your car to overboost (since your car tune, and vishnu's pre-loaded maps were made in warmer temps)
use xmap and turn down boost by 1/2 to 1 lb. shiv has detailed instructions here and on the vishnu site.

 

thanks for all the help guys....my check engine light came on again, and my car only boosts to 10psi, i have to check the boost lines then i will check with vishnu on how to tune down the boost cause im not farmiliar with the setup yet, do i need a lap top to do so? and is it something a novice can do??? my boost was deff. hitting 24 so how much lower should i go?? also do u think it would be better to stick with stock BOV rather than the one i have??? should i put a high flow cat on rather than 3" pipe i have know?? lol thanks for answering all the questions....i ran a 13.14 @107.3 last night and was hoping for 12's but hopefully the help from you guys will get me there!!! thnaks so much!

 

Run by a local auto parts shop and have them scan your OBD2 port to make sure the trouble code is in line with what a boost cut would cause (I forget the code offhand).

 

umm....what am i suposed to do ????? sorry im kinda new to the scene i have no clue what you mean....

 

He meant go to any autoshop or autozone and ask them to pull the code on the ecu to see if the CEL was due to high boost.

 

you need a laptop (or a very long cord) to load and edit the maps.
follow this link https://www.evolutionm.net/forums/sh...threadid=46627
good luck

 

As others have said, you are almost certainly bumping against the factory MAF/boost cut. Easy to fix by reducing boost 1/2psi or so as described elsewhere in this forum. Some cars are more boost-happy than others. Probably has to do with variances in the turbo control system and associated plumbing. So don't be afraid to use XMAP to dial things in properly for your particular car. Souldn't take more than 2-3 minutes and is one of the advantages of having a tunable system. All you may want to install/borrow is a boost gauge to make sure peak boost doesn't go above 21psi. It's one of the things that every turbo'd car should have. Makes diagnostics/fine tuning much easier. With your boost in check, you will run quicker and without the boost cut.

Regards,
Shiv

PS. If you are only seeing 10psi or some reason, that would suggest that the boost wire came loose. Make sure that they are joined up and that they are secured with the shrink wrap or electrical tape.

 

i hit 24 psi so ill tune down to about 23 or 22 peak?? we will do it on the lap top tonight..thanks so much shiv and i hope that all goes well with the retuning!!! thanks!

 

If you leave it as high as 22-23 PSI peak you will probably still have problems. This is especially true with the colder ambient air temperatures common to Philly winters.

As Shiv and many others have already advised, peak boost should not exceed 21 PSI.

 

so if i peak at 21 and dropp to about 19, 20 at redline is the xede working at optimum performance??? im breaking out the lap top tomorow night with my friend he knows his tunning and has an sti and turbo miata with 249 whp so i hope he helps!! thanks for the help again reply if u have more info please..

 

That should be fine.

 

so yes it is working to "OPTIMAL' performance or "that shoudl be fine"......that worries me when i spent 900 bucks and waited a month, not to be rude but i want honest, and acurate sugestions.this is my daily driver and i weant it fast but also to last....thanks.....