Supercharged K20a2 Vtec - Race Spec by cptkirk

6 minute(s) of a 377 minute read

Link to a video that shows all the participants of the Saturday morning session, a real varied bunch of cars:

6-25-2013

In an attempt to get my noise levels down to get onto 98db track days I have added a removable extra silencer to my system now and I still have the ability to add my little bike silencer to mix as well should I require it. Also for the mini purists the exhaust comes out the correct side now (I personally like the centre exit look but its not an option with the diffuser).

So Last night Stevie G and myself set about making the new parts of the system and finally finished at 01:00 this morning which was good as there wasn't anything on the road when we went for the road test at unmentionable speeds.

So I removed all the wadding from the original silencer which was not in good shape as the outer skin of the silencer was colouring up with heat patches where the wadding had blown out of the exhaust. I have replaced the old wire wool/fibreglass wadding with Acoustafil High Temp wadding from PTR Exhausts. Its got a good rep and is a piece of p!ss to fit as it expands with heat so was jsut a case of taking out the old, wrapping the new around the perforated pipe and slotting it all back together. Anyone thinking of doing this will require 2 linear meters to fill a 6" silencer, width is dependent on size of silencer (I used 500mm wide for an 18" wide box).

Anyhooo, here are a few pictures of the work: 

6-25-2013

Personally I am not a fan of the Supertrap as they choke the system a bit too much for my liking especially in forced induction engines, I am not doubting their ability to reduce the decibels though as I know they do work. After seeing my manifold glowing bright red through the ceramic coating I figured that an absorption setup is the only way to silence the car, any form of restriction will just cause unwanted heat build up.

Hopefully with all this work should see the end of my black flag woes. As I said before if this still isnt enough I have the bike silencer that I know reduces the noise by approx 4db on a static (Stevie G if your reading this might need another stay making for the little silencer.....)

On a positive note I have to say that the whine of the charger never sounded so loud or so sweet......

9-5-2013

Thanks, it would be even more fun if they weren't so strict on noise limits, having to lift for noise meters and going into higher gears to avoid being black flagged........it was good fun though.......

For those that haven't seen them here they are:

9-10-2013

A mate of mine came to see me at the LSMOC day at Goodwood and took the picture below, I kinda like it.......

9-18-2013

The below is copy and pasted from the comments box in YouTube:

I managed to get some footage of a few 0-60 runs, this was the best of the day, I still think there's room for improvement.
This attempt was setting of in 2nd, as it hits the rev limiter the needle goes blue to indicate that it has reached 60mph and then shows the 3.3 in the speedo LCD display - you might have to get close to the screen to see it clearly.
The SPA speedo/tacho is calibrated to within 1mph of my GPS speedo/camera detector.
Apologies for the quality of the footage - its difficult holding onto an iphone and trying to get a good 0-60....

I would really like to footage of other peoples 0-60's as knowing what mine can do with 370BHP I struggle to believe other claimed 0-60 times.

Its one thing to claim your car can do something on the strength of what you've heard others can do   -   its another putting the proof out there....

10-1-2013

WHEN IS TOO MUCH POWER TOO MUCH????

Well for the Z's supplied drive shafts it would appear that their 'Race Drive Shafts' is about 333RWHP:

Setting off from traffic lights with a fair amount of revs but by no means dropping the clutch in like an idiot and BANG - one snapped driveshaft..

Waiting to see what the cost is of a new one from Z's and also looking into getting a more heavy duty bespoke version made for it as not sure that replacing like for like is the best way forward.........It could have been a faulty bit of steel but do I want to take that chance again??????

Haven't even covered 9000 miles in it yet.

Struggling to hold back the expletives.

10-4-2013

I have been in contact with Zcars about buying a replacement unit but was asking if there was any difference to the one I had on mine and their newer versions?? Turns out the ones I am running are the same, however in discussion they said that this is the first time they have had anyone break a driveshaft and we both agreed that there were other setups out there running bigger numbers than I without issue. Also as I looked deeper into driveshaft failures it would appear this is more than likely a case of a bad bit of metal as driveshafts tend to break on or near the transition to the splines, not in the middle as mine did. So with this in mind and the very kind offer of a free replacement I am going to stick with the Z's supplied unit.

Thanks to everyone for their suggestions of other driveshaft suppliers and words of encouragement. Hopefully get the new shaft fitted next weekend and then back on the road.....