blr2g

iTrader: (5)

I recently switched to a Tial 50mm vta bov from a hks ssqv v2 bov and now my gas mileage has diminished to an awful 10mpg from 20mpgs. I also upgraded my injen intercooler piping to an ETS v2 licp and turbotrix short route uicp all fed into a fullblown 70mm tb. Everything else remained the same. I adjusted the tune from the additional air the car now pulls in from 12-12.5 afr to a steady 11.5 afr for WOT pulls. I adjusted the tps and the idle is great. I boost leak tested the car and didnt find any leaks to 30 psi. I noticed that now the car stays pig rich when off the gas in any situation and not going lean like it did before. I suspect I am losing my gas mileage at this point. I changed the spark plugs with new ones gapped appropriately and that did not help. The car runs strong with VD dyno numbers at 450 awhp and 360 ft lbs with little to no knock.

I changed the bov springs from the black spring staying open very easy to the white spring and now I am back to the unpainted spring which seems to have helped a little.

I am on maf with tephra v7 9653xxx. Can anyone else think of anything I can try? I attempted to adjust the decel table values but that didnt seem to help.

My next guess is a new o2 sensor.

I searched everywhere but cant find anything. I have been running the ssqv vta for years now with the known annoyances but they wrre tolerable. The tial will not be if I can only get 10mpgs.

Not really wanting to speed density as I have a lot of elevation changes to deal with in the Alps.

2004 evo 8 gsr ssl
Kelford 272
fp red dbb
Spoolinup cop
pretty much every bolt on can be seen in my signature.

any help will be appreciated.

andrewzaragoza

iTrader: (6)

how are your fuel trims? those mods shouldn't cause the mpg drop.

blr2g

iTrader: (5)

Fuel trim low was at 10%, mid at 0.9%, high at 0%. I adjusted the latency-voltage values and will check it out. Thanks for the suggestion. I also am running some fuel system cleaner through as well.