Ok so.. last season car ran great with 0 issues. It still does BUT I'm now getting a p0108 and p1498 codes. When they come on my traction control light and eml light ALSO light up.
the only thing thats been changed from last year to now has been 1x ported intercooler horns , 2x gpr belt tensioner , 3x ac delete pulley , 4x 5% lightweight alternator pulley and 6x I swapped on the stock intercooler and am relying more on meth for cooling instead of the grs motorsport intercooler.
car is currently making 22lb of max boost. I smoke tested it at 5psi and found no leaks. Im also running a gen2 sprintex supercharger , tpr2 head and ns1 cam with full bolt ons , custom tune and stage 2x snow methanol kit set to start injecting at 13psi..so i highly highly doubt its leaking at the boost tube like the codes are usually associated with..
could these codes be caused by the 2lb extra of boost I'm now making vs last year ??
Idk if these cars throw codes for overboost or what but I've read and heard rumors they do but have never gotten a definitive answer regarding it..
Any help would be very much appreciated. I have spare tmap , map , crank , cam and even knock sensor and few of them are new still so I can try swapping sensors around but I'm not sure they're my issue since the car does run fantastic and pulls fricken HARD all throughout the rev range.
whats the dillio here guys , im stumped....?...

 

After a bunch more digging , I'm gonna remove my catch can tomorrow and run the car and check if it throws code..
I believe it might be having vacuum issues due to the can AND because my cars making over 20lb if boost which is almost 2x what the pvc system is designed for. So maybe the catch can is screwing up the flow and metering of the vacuum and boost... if that doesn't help maybe ille try and vgs mod...
any other things you guys think I should check or try ??? Im having the clutch done in like a week so I'd really like this last bug worked out 1st...

 

Anybody ??? I tried turning off my meth , removing the oil catch can , new tmap , map , crank and cam sensor. Smoke tested it from both map and tmap spots with the throttlebody closed off and NO leaks.
I'm stumped...the car runs great , it holds 21psi of max boost and its -13 to-15 in neutral at idle and in gear while off the throttle it goes down to-29 Vacuum so I can't imagine it's a Vacuum or boost leak but it cooooould be a possibility..
I'm stumped here guys help me plz ! I even painted the intercooler cover snd that STILL didn't help it..

 

Could the tuner have forgotten to tune in the bmwv12 throttlebody??? We did just finish tuning at the end of the season last year and that was a mod I'd needed added..
I'm wondering because I for ***** N giggles decided to try my stock ported throttlebody i had yet and wouldnt you know it.. no codes ! Maybe I didn't drive it enough but I drove 20miles and like 30min and befor as soon as I went wot abd it made more than 17lb of boost the cel , trac and eml lights would come on.. now , NOTHING !
I feel like it's lost a little power going down in size throttlebody and intake buuuuut NO CEL.. I will have to do some more testing and 2x check that it's for sure gonna stay off.. I could even run with my meth on and Injecting VERY low psi too without it going too rich..so maybe I might just leave it asis unless the tuner can dial in that bmw throttlebody with no cel. Idc if it's a trackcar or not but I'd rather NOT have my cel on constantly so that while I'm racing or running the car hard I want it to come on IF it detects an issue rather than waiting until I hear or feel the issue and by then it could be too late..

 

Not sure if this will.help , but a while back I believe I had those codes and overboost, we narrowed it down to the oem pre- cat being cracked and partially clogged . Swapped out for the 4-2-1 header and issue got better .

perhaps try to put your grs back on and see if anything changes .

 

Yes! My car was having overboost and it turned out the cat in my my Milltek header apparently let loose and clogged up the rest of my exhaust. Took mechanic forever to figure this out by the way. No more Milltek for me. Wound up getting JCW exhaust and mid pipe and putting OEM header back on. Liked the look of the Milltek better though, but what a pile.

 

my 421 obx header is catless and 2x yr old only.. I'm definitely not having an exhaust restriction. It also has nvida behind the headers..it's a FULL bolt on car , 550cc injectors , head , cam , sprintex ectectect...
im wondering if the larger throttlebody wasnt tuned for..
when we tuned the car we were doing on road tuning and got it spot on for its setup. So i think once i changed to the bmwv12 throttlebody, I believe that's my cause for the codes now....but that's still odd , you'd think just switch throttlebody wouldn't cause that because even stock tune can compensate for it but maybe my custom tune is so precise that little change threw off my metering...ille have to do some more test drives tomorrow and if cel stays off with stock throttlebody, ille have to talk to adriancl and see if he'd accounted for the throttlebody or not when we'd did my tune. We may have tuned it for the stock ported throttlebody and not the bmwv12 throttlebody...

 

Test the LDP in Inpa. Inspect wiring for tmap. How is Natase handling your boost level on the dme with stock tmap? Split second voltage clamp? Other wise 22 psi and the factory tmap will throw over boost which will throw DSC and EML as the DME can't calculate load in that condition so that's why those lights come on. I am assuming he disabled fuel cut?

Your prob just bouncing the max sensor input randomly based on our weather. What was the temp outside when you noticed this? Your already riding the line of the stock sensor and if it is a cool day you might have peaked over the limit and threw a code. If he shut fuel cut off you wouldn't really notice like a harsh reaction when you hit the limit. If it was still on it would likely buck when you hit that limit. I dont know if you can scale a omni 3 bar for the stock dme or not.

I can't recall the max range of the stock tmap but remember what ever it is you subtract atmospheric right off the bat, so in our area that is 15psi ish then you add your boost of 22psi to that and you get 37 psi. People sometimes forget that atmospheric gets subtracted right away for example if a sensor has a max reading of 30 psi you subtract right off the bat 15 psi (based on your elevation) and your left with a range of 15 psi to work in. So you might be very well be creeping over the range randomly based on weather or rpm or both.

 

I will look into what was done tune wise but yes , it was colder out that day. Colder than i usually drive the car in , it was below 40'F..
though driving today on stock tbody and intake I'm not getting any codes. So I'm probably just going to leave it asis..running the smaller tbody i loose abit of topend power but i believe the increase velocity from the smaller tbody allows me to run my meth activation at much much lower psi start point..I was having it turn on at i belive 14 or 15psi but now I can start it at 5psi and it still stays within good afr and doesn't go too lean.
I need an intake now for this stock tbody as I wanna still use my velocity stock so ille have my intake guy make me another one and get it en route soon...
I have 2x and 3x checked wiring..I actually put in new harnesses last year too and some wiring but I did recheck it all just encase and checked that the pins in the harnesses were making contact and it was all ok.

 

Do these codes get set when you drive a certain way? If so, how are you driving when they get set?

 

the codes ONLY come on when I go wide open throttle Above 3k rpm and colder outside temps. It also will happen while using the larger bmwv12 throttlebody because I believe it's making abit more boost and much more flow..
I have been talking with my tuner though and we will do some digging and retuning.. he seems to think he knows exactly why it's doing it and how to fix it.. so once my clutch n flywheel ect is in and a few breakin miles I will retune and post back if the problem was resolved fully , because I wanna run the bigger tbody if I can.