I have no secrets, I'm just a Newbie trying to learn. My Dyno results (approx, as I don't have the papers with me) are (at the rear wheels):
With 3" exhaust, front mounted intercooler, gutted and rotated upper, ported lower and Forge bov: HP 174, Torque (I'll have to check)
With addition of Walbro, big VAM, PE: HP 208, Torque 215
I still running the stock air box with a K&N filter and an additional cold air inlet. This week I will be swapping in a K&N cone through the fender. Maybe this might help lean it out?
Retired and Accepting it!
Its hard to beat that at $58 with the same range as the bbk and kirban.
1988 XR4Ti Chestnut Brown/Spice Leather
MC2 Coilovers and Bushings, Contour Rims and Rotors, Ported Motorsport Head, Cosworth 4x4 Intercooler, Holset HY35 Turbo, 80LB Injectors, Megasquirt2 EFI
Get a wide band of your own. The single best thing you can buy for your car hands down.Having your a/f ratio off by just 1.0 will make huge power differences. I would not recomend playin with an adjustable fuel reg without being able to see what your a/f is doing. You ever done a headgasket on one of these yet?You might be soon.
In my experiance it is possible to get this tuned in pretty good if you do it right.
If you are at 12.6 at 6k/wot you are too LEAN. You need to raise the fuel pressure to get it back down to around 11.5-11.8 range.
The reason its so rich down low is from the VAM door being sucked open to early,you can help lean it out down low by tightening the vam spring to put more tention on the vam door so it will not open as and so fast before you hit WOT. It will take some playin with but it is totally possible to dial this in way better than it is now.
If raising fuel pressure doesnt richen it up at WOT you could be beyond what the injectors can flow or a possible fuel pump issue.