HSV Headers

[monstar]

To fit dip stick tube with HSV headers you need two people one up top and one under neath and a good small pipe bender,very fiddly as the starter and oil temp wiring gets in the way,lots of in out bend a bit n back in but perseverance it does work with final tap of hammer to seat O ring.These cats will bolt up to mid section with flat flange on mid pipes,to make HSV cats fit real well cut flange off cats at exit end remove small pipe that holds conical seal it goes about 1 1/2 inside cat and about 2 1/4 in dia then reweld cat flange and you now have 2 1/2 cat exit or you can expand cat out let n weld 3inch flange to keep it stock looking.

I think most VFII people fitting HSV headers and cats want to keep the warranty though, hence the focus on keeping VFII cats and bung location. Because it won’t set off the check engine light.
Rather working the front, flange after merge at end of primaries into cat inlet.
Basically fabricating a better downpipe solves the tune issue whilst improving performance potential.

 

[LS1SS]

You are correct monster,that is the next thing I will work on,I think any one doing this mod if they can find flexible dip stick they will find it a lot easier,I don’t know where or what type to use that is compatible with these engines.

 

[3rspecB]

You are correct monster,that is the next thing I will work on,I think any one doing this mod if they can find flexible dip stick they will find it a lot easier,I don’t know where or what type to use that is compatible with these engines.

The oil dipstick was a pain too when I fitted HSV headers to my VF2 Redline. I had access to another VF2 LS3 to look at. This made it easier in the end to fit the disptick. We didn't bend the pipe, just had to go in at a different angle and all good.

 

[duaned]

Would it be safe to say those that are fitting HSV cats and HSV Headers are just wasting time and money if they propose not to get a tune to balance AFR's etc? With the extra exhaust flow, would this provide a more lean mixture resulting in less power?

 

[monstar]

Would it be safe to say those that are fitting HSV cats and HSV Headers are just wasting time and money if they propose not to get a tune to balance AFR's etc? With the extra exhaust flow, would this provide a more lean mixture resulting in less power?

No need (requirement) to tune anything, but yes is probably better to describe the effort as maximising combustion and exhaust scavenging efficiency within the parameters of the standard tune.
It will make a difference to performance and sound, I think worthwhile maintaining warranty compliance with zero risk / decent returns.

 

[Paulie81]

so who says it will preserve factory warranty?

 

[monstar]

so who says it will preserve factory warranty?

By not altering the factory warranted tune settings. Like virginal chastity changing that whatsoever definitely voids the warranty.

 

[blackve76]

You are correct monster,that is the next thing I will work on,I think any one doing this mod if they can find flexible dip stick they will find it a lot easier,I don’t know where or what type to use that is compatible with these engines.

Not have headers but I got a flexible stainless dipstick when I did my headers(Rex headers)

 

[LS1SS]

Blackve where or what make of dipstick did you use?

 

[franco]

So does any company make a set of headers for the VFII that will bolt on with no modifications using existing cats yet ???