Volkswagen South Charlotte
a.k.a. VSC Tuning
Unitronic through the
Can someone please take a look a the picture? My discharge pipe has a ventilation hole. Should it be blocked or open to atmosphere? I noticed when blocked the car doesn't like it and it messes with the idle and revs.
MK4 2000 Jetta vr6 12V
bumping this up, new setup being tuned, 22t cogs, v1 charger, mk4 HG , 268 DRC , currently no intercooler and on a 2.9 clone trying to tune it conservative for the street and put some racegas in at the track
Finally got my car on the road, but now I'm dealing with some serious DV flutter on decel. I have a good vacuum source (verified with gauge), but when I let off the gas at higher RPMs, I can hear the valve fluttering along with some other noises which I imagine is compressed air backing into the charger.
I've tried the valve mounted in both directions & in different locations (after intercooler, before, discharge after the MAF) with the same result. I even tried a softer spring in the DV (comes stock with the stiffest (30psi) spring).
UM S1 FI tune
Forge supersize valve
Help! I can't drive the car like this or I'll ruin the 'charger.
Yeah you will want a very soft spring in your DV. I run a Forge Super DV on my cogs and it's working wonders. It opens and shuts super fast as it should. I think it's a 4-6psi spring max.
Keep in mind that when you have cogs and you're off the throttle on decel, the DV should be completely open pushing a TON of air. It's kind of loud and cool to hear how much air is recirculating when it's open.
Last edited by vampvr; 07-21-2016 at 02:09 PM.
If you're making your own, your best bet would be to use a string and measure the length when wrapped around every pulley in the correct orientation with the charger in.
This is the belt I use on my Supercharger Innovations kit for a 24 tooth pulley.
Fueling question for any guru's out there... current setup is UM stage 2, 440's, 225 walbro, ~14psi on a V1, 12v with 268 cams.
After doing a fuel pump and test pipe on my car, I've noticed an increase in power but getting some weird power loss up top. Once I hit 5500-6k RPM my car is popping loud out the exhaust almost like a misfire and all power drops immediately. If I shift fast after this happens, the second I'm back in WOT it just doesn't move at all. If I stay in lower rev's this never happens at all and car drives perfectly normal.
Am I still lacking fuel? Bigger injectors? Bad coilpack? Spark plugs were just replaced a few weeks ago. Let me know what you think...