livesports

iTrader: (2)

Car was tuned at Tuning Technologies on 91 oct with a 23psi spike, running great.

Car would not make more boost on 100 octane map.

I was told to install a JDM bv and check all connections. I installed the JDM bv and an ams LICP(checking all connections) and the car now spikes to 27PSI (YIKES) on 91 map.

I turned down the boost tables as directed and car still spikes to 27psi.

I turned down the boost table to almost 0 and still the spike.

Whats up?

fromWRXtoEVO

iTrader: (18)

There is nothing wrong with spiking to 28PSI, I ran 28PSI since I had the 3" TB, MBC and custom tunning.

You should freak out for the boost readings, as long as the car does not detonate you should be OK.

Vishnu_Evo8

iTrader: (6)

as long as it drops really fast to 22-23 its ok. but if itholds thats not that good.

jj_008

iTrader: (8)

Check your hose connections from the LICP, wastegate and solenoid.

livesports

iTrader: (2)

boost does not drop immediately.

i will check all of the connections, but which connection would allow the car to boost to 27psi and disable boost control?


I dont understand how changing the LICP and BV could cause this problem.

Any thoughts? or explainations?

4GEvo63

they tell u to change ur I/C piping (and/or I/C core) because it lowers boost by a little bit...the BV, i really wouldn't know why...sorry for the stupid question, but what is boost spike?

NEMES!S

iTrader: (3)

What kind of bov, I changed mine to MR and it spikes close to 27 all the time, does drop to about 22.5 though
as long as there is no knock I wouldn't worry, call it good gas

4GEvo63

did u guyz tune or up ur boost cuz i thought the care can only hold ~19psi?

shiv@vishnu

iTrader: (20)

A 27psi spike is too high on 91oct gas. If your boost table is all zero'd out, there is no reason to see anything close to that boost-- even if it is just a spike mething is amiss...

shiv

livesports

iTrader: (2)

Thanks for the reply Shiv.

Something is amiss. I don't know what would cause this or how to look for the problem. I do know the two things that I changed and the results of these two parts is this problem.

Can you give me an idea as to how these parts or the parts around them could effect the boost like this?

Thanks in advance

livesports

iTrader: (2)

I think that 28 psi spike is too much for 91 octane. If it isn't, I am wrong...but still 28psi seems like a frightful amount of boost to be seeing while having 91 octane fuel in the tank.

livesports

iTrader: (2)

by the way, the boost table is at about 30%, but it made absolutely no change in the boost, since turning it down from 70%-100%. this is what concerns me and tells me that the xede, for whatever reason, has losts it's ability to influence boost.

Love some help solving this problem. Especially since I get a 10.5 hotside installed this Saturday and would love to tune the car after installation.

shiv@vishnu

iTrader: (20)

The XEDE can't lose its ability to control boost. But if it could, it would default to wastegate spring pressure since the boost control solenoid wouldn't work. Try this:

Unscrew the ground wire to the XEDE. This will completely disable the XEDE's boost control system. The boost should drop to wastegate spring pressure (1-1.2 bar perhaps). If it doesn't, something is mechanically wrong with your turbo system or wastegate plumbing. The XEDE (or any other boost control device) can ONLY raise boost from your base boost pressure, not lower it.

-shiv

superman105

iTrader: (11)

Shiv I had the same problem with the Xede
this happend right after I updated from your beta V3 at the S.Cal Dyno day to the released version of V3.2 with smart

No matter how I adjust the boost it will spike to 27-28 psi

I first thought it was the wastgate so I connected the boost line directly to the wastegate and it wont pass 12-13 psi which is telling me the wastgate is fully functional.

I even tried change the boost solenoid but that didn't make any difference

the problem is still there however to avoid overspike I just installed a MBC for the moment...

superman105

iTrader: (11)

here is my original post on the problem

https://www.evolutionm.net/forums/sh...d.php?t=155245