new parts=slower..........why?
Originally Posted by qwkevo8
ok, ill make it simple, with hks intake, buschur downpipe,no cat, hks ss, and exhaust i ran 13.0 at the track @ 106..then i got a mbc, turbo xs bov and reflash...and an act clutch, and then i ran a best of 13.1 @ 104 and now i just put on a walbro 255 fuel pump and ran a best 13.3 @ 103! does it just need tuning or what.... seems like it keeps losing power..........i always get 1.8 or 1.9 60ft times. the other evos w/ about the same set-up are running between 12.4-12.9! any help at all is appreciated. 
you have just answer your own question bro. here is the clue F_A_H
I had the same problem. After i put a walbro 255 the car got VERY rich in fuel and run worse. Actually i dont think one needs a walbro if not run over 24psi. At least this is what we saw on a Dyno.
However i highly disagree with the stock airbox. The car needs air. Get a carbon hood with the hole in the place where airbox gets the air. Leave that "plastic curve" in place. Make a carbon box that follows that "plastic curve" and in there get the larger filter you can get. In a few words, create something like the A'PEXi Aluminum Induction Box but much cheaper and without relocating anything.
However i highly disagree with the stock airbox. The car needs air. Get a carbon hood with the hole in the place where airbox gets the air. Leave that "plastic curve" in place. Make a carbon box that follows that "plastic curve" and in there get the larger filter you can get. In a few words, create something like the A'PEXi Aluminum Induction Box but much cheaper and without relocating anything.
Originally Posted by qwkevo8
ok, ill make it simple, with hks intake, buschur downpipe,no cat, hks ss, and exhaust i ran 13.0 at the track @ 106..then i got a mbc, turbo xs bov and reflash...and an act clutch, and then i ran a best of 13.1 @ 104 and now i just put on a walbro 255 fuel pump and ran a best 13.3 @ 103! does it just need tuning or what.... seems like it keeps losing power..........i always get 1.8 or 1.9 60ft times. the other evos w/ about the same set-up are running between 12.4-12.9! any help at all is appreciated.
I have read that the Walbro makes you run a tad richer than stock, which is pretty bad considering how rich stock is. But it seems to me that your problem began BEFORE the Walbro and became worse with it.
As was suggested, go back to the stock airbox and a drop-in K&N filter. The stock box is good for 400 WHP. Our MAF is very finicky and does not like it when you change the airbox. But again, your problem seems to have started after that.
Get a JDM DV, they are the best for our cars. They hold boost well and are not VTA.
Good luck
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