Supercharged K20a2 Vtec - Race Spec by cptkirk

9 minute(s) of a 377 minute read

I know what its like to write a questioning reply to something and try not to offend, I completely understand and welcome constructive questions/comments, hopefully it'll lead to a better solution/answer any questions.....

I will only be using this when tracking the car and it should cover the majority of the downshifts I will be doing as they will all be dropping into a lower gear at high revs when braking like mad.

Until I test it I wont know how effective it will be, whether a delay will be required (I figured the delay should last as long as it takes to depress the clutch, but the time this takes might be the same as the time it make to make the circuit, activate the solenoid, pull the pedal and rev up the engine) and how long the blip needs to be will all need fine tuning. I will make the circuit so it kills the feed to the solenoid should the clutch get released early or you get a foot slip off - not currently in the setup on the video.

The solenoid/throttle interface is proving interesting to design, due to the snappy nature of the solenoid, I am aiming to use some springs to soften the initial pull, to be a bit kinder on the throttle pedal/cable/body. There are various changes in angle between the rotating pedal and the linear solenoid which need to be overcome, the solenoid also needs to rotate slightly to take up the angular changes in one plane. I have some hand sketches now and some parts ordered so I shall be making a 3D model to prove the theory soon. Trying to keep the mechanical side of it simple is the biggest challenge, consider also that it must not affect the throttle pedal when not in use.

3-19-2015

I have Toyo R888 225/45 R13 (E marked (list 1B in the MSA rulebook) medium compound track tyre) on my rears and you do not need to do any monkeying around to get them on the same size rims, they will grip a feck load better than continental road tyres. They aren't bad in the wet, just not great with standing water as there's not enough grooves to expel the water.

I have posted this before but here it is again, a list of track/performance tyres and sizes - you might want to try the Kumho 215/50 if you're wanting a track tyre or the ZZR 215/55 for a road tyre

Still waiting on parts from the east to make any progress on the throttle blipper...

3-20-2015

Flowmaster DBX Silencer Setup

With the help of my good mate Stevie G we made some progress on the welding up of the new silencer setup. WE hope to make more progress next week, I'll let the photos do the talking:

AUTOMATIC THROTTLE BLIPPER

I got my new Solenoid through, to give a sense of scale, there is the original 5kg solenoid and a 13mm spanner in the photo. The new solenoid is good for 45kg so shouldnt have any bother doing what I need it to do....

Now I need to draw it up and model the whole setup to know what I need to manufacture to get it working.

 Here's a hand sketch of initial ideas of how to mount it, the pedal isnt in view yet...after receiving the new solenoid I might look at getting a new insert for it machined that will incorporate a lot of this - maybe, depends on the hassle factor

I hope to have some modelling done next week to show.

3-23-2015

Re the tyres, I had a quick look and although a ACB10 245/45 is tempting, the tread width is 31mm less than the ZZS (ACB10 = 206, ZZS = 237):

If the tyres are as Cheap as Jim is saying I will be tempted to get some, however I do get R888's at pretty much cost price so they are going to need to be a really good deal for me to swap over to them.......Also ZZS noisier than R888's at a reported 69dbs (ZZS 72db's):

3-27-2015

Going to repost the photo's of how I made my inner arches, hopefully this will show how big they are for people that might want a set. I need people to realize that they were made specifcally for my car and the big Zcars arches that are on it, combined with fitting flush to the Zcars spaceframe forward of the wheel. What I am trying to avoid is people ordering some and then telling me they are too big or that they dont match the cut for their outer arches.

After loading the photos and looking at them again there may be different options to fix them to the car, maybe using the sapceframe and a rubber gasket to the body??

3-31-2015

Flowmaster DBX Silencer Setup

A bit more work done on the silencer set up.....I will make it stupid quiet so I dont get blag flagged......Damn you - decibel meters.....

Here's a couple of photos of the silencers, it's a little difficult to see the conical shape of the perforated material but you get the idea, the inlet looks to be about 6" deep and the exit about 10".

exit end:

A few of last nights welding - thanks Stevie G...