slowslc

What happens if you disconnect the frequency valve (not the DV or BOV) on the 1.8T ?

If you keep the boost low enough on a chipped car , say at 12psi, would the car still be driveable ? Or will it confuse the hell out of the load maps ?

Thanks

d

Clark@turbo5.com

If you yank the Vac line off you will have no wastegate control. The turbo will make 30psi and blow up with in about 5 minutes. People have done it and that was the result.

If you take the Freq valve out of line but leave the Vac line hooked up you will get Low boost. The ECU Can no longer instruct the Freq valve to bleed air past the wastegate so it will slam shut.

Adding a boost controler electronic or manual would then alow you to raise the boost. I would not do it for several reasons. *unless, I had a turbo that was safe to run a controler and I had some way to set and monitor fuel flow from inside the car.

A. You dont have the correct Fuel maps to run more than stock boost with your stock chip. Once you go WOT on the Bosch injection you are stuck reading a map. That map was made for 5-7psi. The O2 sensors are out of loop. You WILL run lean and cause detonation.


B. Since the Ko3 turbo is over spinning at higher boost levels we must back boost down as RPM's rise. Depending on tuners you may see 10-12 psi at redline but 17-20 psi in the middle. At 3500 rpm the turbo can take a spike to 20 psi. It cant take that at 6000. Most* boost controlers have one preset level of boost. If you set it at 12psi it will make 12 psi to redline. You dont get to run a bit higher boost in the middle of the RPM band. You loose major amounts of torque and fun


This is just not a car where a boost control is needed. Add you favorite chip and your are all set.

Clark<ul><li><a href="http://www.turbo5.com">http://www.turbo5.com</a</li></ul>

Mach V Dan

The A'PEXi Super AVC-R has RPM-dependent boost control. There is still the problem of fuel enrichment, though...

--Dan<ul><li><a href="http://www.machvw.com">Mach V Motorsports</a></li></ul>