Supercharged K20a2 Vtec - Race Spec by cptkirk

4 minute(s) of a 377 minute read

New Driveshafts

So late autumn last year I had been out for a hoon and when setting off onto a roundabout I snapped a driveshaft. The same side as had previously snapped. Not happy, more than anything not happy because had to push the fecking thing myself off the roundabout, with everyone I'd previously overtaken going past.....I'd like to add that I consider myself fairly mechaincally sympathetic when driving and absolutely do not clutch drop when setting off so this happening a second time was disconcerting.

I got in touch with David at Zcars in Ashford, about getting new ones and went for a trip to see them in the new (to me) premises. For those that haven't been it's a really professional outfit and is so good to see someone trying to make a go of the company. If anyone ahd any doubt about the new company being as good, I can tell you they are and their customer service is top notch.

In our discussion we agreed that just using the same driveshafts as previously supplied was not going to work long-term. The new driveshafts are made from gearshaft steel so should be able to take the abuse, especially as I plan to add a few more ponies down the line (more of that later).

Old snapped one:

New shiny ones:

I am trying to get them fitted asap.

Total of new shiny bits:

New Supercharger:

Some of you may have noticed a new SC in the photo of new shiny bits. Well this payment for CAD work for my man at Merc Racing in the US. I've been designing a new intake manifold for use with the Honda K20 engines that can take different sized superchargers and also have the facility to add a water to air intercooler core if required.

The old Jackson Racing unit I have currently strapped to the car produces 1.02L per revolution (3 lobe 60degree twist). The new SC is a Magnuson TVS2300 and produces 2.3L per revolution, not only does it move more air but it uses a 4 lobe design with 160degree twist which is better for peak performance.

I am currently waiting on the new manifolds being cast so wont have one in my hands any time soon.

Here are a few renders of what it looks like:

I invested in a 3D printer earlier in the year so I could validate the design, here's a few pictures of the print:

Here's a few more of the TVS2300:

It's only downside:

Obviously more to come as and when things progress.....