Cobalt4209

Im thinking of ordering a forged vented bpv from modern performance, does anyone know how i can tune for this with hp tuners ?

Cobalt4209

Nvm Just remembered My lower charge pipe came with a maf relocation with wire extension lol.

cobaltss#01

iTrader: (4)

So am I to understand that if you put this on and just use the maf relocation you don't need to change your current tune?

Cobalt4209

All you would.have to do is retune the maf

cobaltss#01

iTrader: (4)

Cool thanks.

Cobalt4209

k just to update i relocated the maf and at first it ran like a pig so i changed the maf base table too all 1s then i multiplied my hole freq table by 1.15 . This fixed my idle and it runs pretty good +/- 5 on the trims. all i gotta do now is log and dial the trims in and its done , Im ready for my forged vented bpv when it arrives

Cobalt4209

Just to update I had to switch my maf back to its stock location. I noticed it was running real rich at wot and the afr was all over the place under boost . I do not need to destroy my ring lands and runing that rich sucks lol. The commanded vs actual afr was way off . I would rather have it run rich between shifts for a second with my vented bpv rather then always running rich . Im gonna figure out how to tune with my maf in its stock location . I wish we had access to pe tables.....

tomj77

iTrader: (2)

doing ur fuel trims one time isn't tuning for a basically bov. get it done properly

Cobalt4209

I was tuning the trims all day coundnt get my wot afr right it was off by 13 % . Running .74 lambda at wot when it was commanding .85. Now i think i made a mistake by adding 15% to my maf freq at the beginning when i was suppose to subtract 15% So Im gonna give it another shot.

Cobalt4209

noticed in my logs the car is going into open loop during wot this is where the afr goes out of wack . During a wot pull it goes from closed loop to open loop then back to closed loop during open loop my afr is rich ...

Cobalt4209

k started with a stock tune and the maf was pretty close dialed it in over several logs and my afr is bang on now . Im not sure but the tune i built off of previously was a zzp tune i had . I think they have access to other tables that were messing with my blow through setup cause once i started with a stock tune things worked properly. Also i switched out my maf with a spare i had so that might of been the difference as well.

tomj77

iTrader: (2)

did u accidently do something with fuel on the previous tune before u started over?

Cobalt4209

Nope . It might of been the maf sensor itself causing the problems .

Cobalt4209

Well got the forged vented bpv installed it sounds awesome . The only problem im having is it will blow off at the slighted throttle and it also stays open while cruising at the right rpm . Is this because the spring in it is to weak or is it the wastegate demanding boost to early ?