TheSamba.com :: View topic

Sat Oct 17, 2009 3:21 am

I only know the Fuel pressure with out a motor load. the gauge is on the motor. I plan on adding a pressure transducer over the winter and a switch on the dash to select between oil pressure and fuel pressure using the existing gauge. That way I can monitor the pressure during testing.

riNR wrote: Fuel pressure ok? My turbo runs like crap when the filter gets dirty and the fuel pressure is just slightly restricted. .....Just a stab in the dark.

Sat Oct 17, 2009 9:19 am

If you truly believe you are sealed and leak free, as a diesel mechanic my thoughts are that the turbo is not spooling up. While it may seem to spin freely, it may still not be attaining the normal several thousand rpm to produce meaningful boost, especially since it is now on an application that should supply drive so much better than the previous one,

Sat Oct 17, 2009 11:18 am

Well I found the problem today DUH! . I assummed the BOV was working because it released when I quickly let of the throttle. As it turns out at around 3000 RPM and up while stilll in Vaccumme it was also releasing. So I readjusted it so it would only release when the throttle plate closes. On a flat road it now Builds Boost at 3000 RPM and is a 10 PSI by 3800 RPM and the Buggys going sideways. :shock: With the offroad gearing there really is not much load on the motor at lower RPM. I suspect that on the trails and climbing hills it will Boost earlyer in the RPM Range. Thanks for all the help.

Sat Oct 17, 2009 11:30 am

awsome. glad you figured it out. now get some mud on those tires, and about 20 feet in the air :twisted:

Sat Oct 17, 2009 3:28 pm

The system was sealed just not the BOV. BTW Dont know if you knew or not but most Turbos spin between 60,000 to 95,000+RPM.

\\ ZARJDR wrote: If you truly believe you are sealed and leak free, as a diesel mechanic my thoughts are that the turbo is not spooling up. While it may seem to spin freely, it may still not be attaining the normal several thousand rpm to produce meaningful boost, especially since it is now on an application that should supply drive so much better than the previous one,

Sat Oct 17, 2009 6:09 pm

Told you it was building boost up to the BOV relief pressure :wink: Just neither of us realized it was relieving at 3 psi.

Glad you got it figured out.

Do you think the BOV got misadjusted during the swap, or is the suby making more vacuum than the vw?

Sat Oct 17, 2009 9:13 pm

16,000m to 32,000 at idle on some units. Really glad to hear you are all good. It really sucks to put so much time effort and expense into something just to experience problems. I can only imagine the grin you are sporting when you have it out for play!