+1

 

Hi Unhingd,

How have you fared with these? Do you still have plans to dyno the gains? Also, how is the sound?

Thanks!

 

We're still working on this project. Car has been at the performance shop for about a week and I'm in "Withdrawl".

 

You should leave the drawl to those that grew up with it; otherwise, it's painfully fake.

 

Haven't seen much on the V8 headers. What is the status of those?

 

Lance your car done yet and if so what do you think about the VAP headers?

 

Stuart or I will have something to report in a couple weeks.

 

Nice. Sounds good Lance.

 

so....any new developments with the headers guys?

 

Unhinged. What is the latest on the headers?

 

They did add about 5 lb-ft of torque and 10 hp, but at the price I couldn't recommend them, unless you were thinking of adding sports cats to radically increase the sound level. Sports cats are needed to allow everything to fit. The sound level was just too much for me, so I reverted to the OEM setup. The power increase is too incremental to notice.

 

Hey Unhinged, did you end up keeping the sports cats? Any power increase on them?

 

I removed the sport cats because of the noise and would have left the headers on if I could have retained the OEM cats. As mentioned above, the headers/sport cats netted a small gain, probably because I am already running at 20 lbs of boost and getting plenty of airflow through the engine without the headers.

 

I see, I guess our OEM cats are not that restrictive at all. Thanks for testing all this out.

 

+1

 

+1

 

Hi Guys,

Long time I've been meaning to update this thread.

So.... put a lot of time, work & $$$ into this project. Part of the engineering work was to try and ensure we were designing something we believed would fit both RHD and LHD cars, as well as those with electric or hydraulic steering racks.

We developed V8 headers in 1 7/8" primary diameter and tested them extensively on the dyno. We also developed V6 headers in 1 3/4" primary diameter, which Lance tested pretty extensively.

In both cases we also played around with some parameters like knock sensitivity (a stainless long tube is going to transmit much more than a cast log) as well as timing, fuelling etc.

The net result in both cases was that there is a measurable gain in mid-RPM torque. However, that gain is only IRO 15-20 ft/lbs at peak, and it was only demonstrated across a relatively narrow power band of about 2000RPM.

We considered some other possibilities in terms of bottlenecks in the system, like the remainder of the exhaust system at 2 1/8"-2 1/4", however if you look at the V6, making 450BHP with pulley/tune setup and realize that the cat sections and diameter of the rear exhaust setup are the same as an SVR making 575BHP there's clearly not a bottleneck there. Or if there was, we would have seen bigger gains on the V6 but not the V8.

Intake is a possibility, but again the same V6 to V8 rule applies here.

And while it's certainly possible that there could be a couple of little improvements made in the header design, the setups we tested were pretty darn close to equal length, with proper merge collectors, and sport cats.

So, the conclusion we have reached is that for the time being, there's not much to be gained from a header setup on these cars. If one got right into it, upsizing supercharger, charge cooler etc. we might see a different story but at these HP and flow levels it doesn't appear to make much difference.

We could produce them, and offer them with the measured gains, but I don't believe that the price we would have to sell them for, there would be a significant enough return on investment for us to see much in the way of sales.

So for now, these are shelved. We have all the jigs and drawings cataloged, so it may be re-opened at a later date.

 

Thanks for having the integrity to come to that conclusion Stuart and for the time, effort and $$$ you put into getting to that point...

 

No worries man. We probably burned $10K or more on this, but at the end of the day if it's not something we believe in 100% we don't sell it. I know the aftermarket industry, and often times in this circumstance the company might just run off a batch and not say too much and just sell them until the truth came out. We just don't work like that.

Sometimes you hit dead ends.

 

Stuart thank you for the update. Thats why I love Velocity AP because of such honesty and great customer service. I've already bought your sport cats and tune for my v6 S and plan on getting your crank pulley next.