im expecting to get a rich reading everytime i take off ,,,but in 4th and 5th gear,,,i go into stoiche,,,,is this normal...and what voltage should the vc2 be tuned to, to get a normal lean to reach reading during boost,,,please help because tuning this thing is a pain in the ass.... thanx johnb everytime i try to fine tune it by turning the screw to the left,,, it will sit at low lean....help!!

I'll see if I can give you guys some ASSistance since I worked on this car with John......I definately know we got the VC2 wired right and when we goto adjust the little gold flatheaded fitting no matter how much we turn it in 1 direction or the other it seems to do nothing...after we ran the dedicated line to the wastegate and rerouted some other lines we started up the car and drove it...for the first 2 minutes when you got on it the a/f guage went to rich and the car pulled pretty damn good....then after driving it for awhile it seemed like the car didn't want to get rich anymore and just kept going lean in every gear and you didn't hear much spooling from the turbo and didn't seem as fast as it did moments after startup....I think the problem is the disc he got with the kit has the wrong ratio for the fuel 12:1 I believe.....If any of you guys could meet up with him or some of the old dogs on this board that are turbo'd please respond with some words of wisdom, I don't want to see his car blow up because it keeps running lean....Thanks for the time and John fix the damn oil pan !!!!

Jeff O.
96NT to WRX

Is this the SplitSec VC-2? I don't really know how you would "tune" it per say; you want to set it to the highest allowable MAP sensor voltage (can't remember if it's 4.7 or 4.9) so that when it does clamp the voltage it clamps at the highest allowable voltage and pours in as much fuel as it can. You just don't want it to go over the allowable voltage; the ECU starts to do some weird things (cutting fuel) when it goes above either 4.7 or 4.9 (can't remember, lol).



Eric Madden

the cutoff is supposed to be 4.7V

well i turn the screw to the left it seems to act better until i readjust to get some rich readings,,,then caput it runs right back to lean,,,should i just keep turning the screw to the left or what,,,it becomes a real pain in the ass to retune the screw and keep getting out of my car..... so is there a easy way..the bov got louder and the pickup and launch gets better when i turn the screw to the left .should i get a voltage meter???

The best way to test it so that you know you have the correct cutoff is to hook it up to a power supply which sends >5V to the input (preferably not much more than 5, but it shouldn't really matter for a quick test). hook up a volt meter on the output side and adjust the screw 'til you see 4.7v on the volt meter.

Matt

thanx mat.... john