OK Bodger, the stub pipes you may have seen on some cars are the ones used for an identical air valve plumbed into the air rail and plenum just below and ahead of the inlet tunnel and it is wired in parallel with the clutch for A/C cars to prevent the engine stalling, at idle speed, when the A/C compressor engages.
So to summarise - there are actually two antistall functions designed for Efi RV8's such as the SD1 Vitesse and the VDP Efi.
1 A/C factory fitted antistall system described above
2 Post production modification (dealer or DIY owner fitted) to prevent Auto cars stalling when the transmission is engaged as described below.
Regarding the factory fitted A/C antistall function you can see the item number 6 on the below A/C circuit.bodger wrote:did the STD for want of a better word AUTO version have some extra pipe work there ?? i seem to remember seeing the blanked off pipe stubs around the trumpet base being in use ???ramon alban wrote:I dont see that? The stuff that Dave identifies consists of an air valve, just visible below the small, loose water pipe on the RH side of the first image - and on the LH side of the second image.that would explain the extra air bypass piping under the throttle body too
It's tee'd into the Air Rail adjacent to the throttle lever bracketry and the EAV "U" pipe using specially restricted metal tee pieces and 4 jubilees.
The whole aftermarket fitment is explained in detail (why, how, when) in the PDF available from Here
And a very useful mod, too, for Auto cars that tend to stall as they go into gear.
the article is interesting , thanks
ooopppsss Sorry Chris for hijacking your post ..
