Recently after fixing a BOV leak I have seen my car spike to 31+ at 8k rpm with a 64mm red. No matter how the duty cycle is adjusted etc it still spikes. was told it could be the bov spring replaced it.. same thing..
Buschur ported coat exhaust, 64mm red, forge dv006 w/ red spring injen piping grimmspeed bcs omni 4 bar tephra v7

It builds the desired boost up until 8k rpm then it for some reason surges/spikes to that boost level. I'm lost for ideas of what it could be. I'm thinking maybe a faulty map sensor, faulty boost controller.. I dunno.. Any advice?

 

'
'

what o2 housing are you using??also what mbc?

 

you sure its not the typical surge associated with the 64mm reds lol hints why they made the 84mm cover for them?

 

Make sure you have your WGA tables set to max out at like 9000, not 8000. Sometimes they will just go to 100% and cause boost to spike in high revs like that.

Have you logged WGDC to make sure this isn't the culprit?

 

I've done a ton of logging but 4ws is doing my tuning i'm just going by what he is telling me. And if you can point in the direction of the tables i'll be sure to check them out.

I just checked and no I have not logged WGDC.

 

I can provide a log too if you guys think that would help try and solve the issue.

 

it's an ebay housing and the grimmspeed electronic boost controller

 

It does not sound like surging to me (sounds like ECU boost issue)....A few ways to narrow it down:

(1) Install MBC - this will take no more than 5 minutes and will let you determine if it is the ECU controlled boost or something else....

(2) Log target boost and / or WGDC

(3) Log boost and TPS - I would like to see if the high boost reading is while you are still on 100% TPS or after you have lifted

 

I did log WGDC not the target boost etc.. It went from 40% duty cycle to 60% to 78.34% from 7200 on. I'll do a log with those values and report back.

 

Is it possible you are seeing a boost spike after you let off the throttle (BOV not opening) ? The reason I am asking this is because you mentioned the issue occurred after you messed with the BOV.

 

It's possible I did hear it open though.. It had a boost leak which after we fixed is when all this started. Had the blue spring installed swapped it out yesterday for a red spring and the same thing.

 

cij911 is on the right track, I think. As he suggested, you could try installing an MBC to see if that'll allow you to eliminate the spike. Also, you might want to replace your BOV with a factory metal MR DV for comparative purposes just to see if that'll fix the problem.

The stock metal DV per se usually won't create boost control issues. If properly functioning it is fairly neutral. Aftermarket BOV's if properly setup may work extremely well. However, in some cases they may require careful setup and fine tuning to function flawlessly.

If the above two fixes do not pan out then try the following method while leaving the stock DV in place instead of your aftermarket unit: Disconnect your boost control device and don't reconnect the Grimmspeed BCS either.

Next, connect a length of vacuum hose directly from the compressor housing discharge tube's nipple to the nipple on the wastegate actuator nipple. Adjust boost up to your target level manually by rotating the turnbuckle on the end of the threaded, actuator rod.

 

Yeah I agree with what he said.. When I had the aem tru-boost i never had any problems.. Then again the bov was leaking too so I'm not sure how it would of reacted once the leak was fixed. I'm going to see If i can get my hands back on the hallamn i used to have on the car and try it out.

 

EDIT: Sorry about the double post! See my post #12 above.

 

OP - You can send me logs, but HONESTLY if you just follow my recommendation (and try the MBC) you'll help narrow down the problem. I also agree with Sparky that changing the BOV to the stock one would help narrow the problem as well.

I am quite confident the issue is NOT the turbo ....