Honda CRX track car build (270bhp N/A)

[Bright Halo]

Looks like excellent workmanship.
Glad you are all sorted.

[Partyvan]

Thankyou!

[Partyvan]

Couple more pics of the exhaust





I am now working on the aero package

[Butter Face]

Looks like a great job. Mind me asking what it cost?

[Partyvan]

Butter Face said:

Looks like a great job. Mind me asking what it cost?

Sorry I only just saw this. It was around £1600 fitted, all inclusive. Price will vary for wall thickness, silencers, length etc

[Partyvan]

Last week I finished off the aero mods on the CRX

The front splitter was made with 3mm aluminium sheet, supported by steel pipe, crushed at the ends to make a mating surface and bent in a vice to the correct angle to allow it to mount to the splitter and the car frame. The whole lot was then powdercoated black.



The rear diffuser was similar, with cutouts to clear the towing eye and backbox. It then had fins made from the same material, riveted onto 90 degree brackets



I was then told the front splitter would never clear The Mountain at Cadwell Park, so that was removed. I then headed out to Cadwell for it's first ever track outing. This was a shakedown test to check reliability and test various systems on the car.







It's a little down on power lately and there's a couple of changes I need to make but overall it went well.

Here's my first couple of steady out laps, excuse the camera shake
https://www.youtube.com/watch?v=Hnc1wiyBpmQ&t=...

Here's a cool trackside video of me smashing my diffuser
https://youtu.be/vykWn20b3l4

I was at a fairly steady pace, and clocked a 1min 46, equalling my PB. To go quicker, I need to ask more of the car. It can give so much more, the lack of weight gives it the ability to push hard the whole lap. I didn't even get the tyres squealing!

Now I need to decide on whether to do another trackday in it, or start early on the modifications to prepare it for the Ring next year.

[Partyvan]

Here's a short clip of it on the dyno
https://youtu.be/uJ3ruO7Wd_s

I seem to have lost some power since the engine was in the EP3. The manifold is tighter and smaller for the conversion and I've no longer got a carbon airbox. It's now 250bhp which is disappointing. On the other hand it's the same power-to-weight as a 500bhp 1500kg car.

I'm going to be pushing to get this on track again soon - with some proper in-car footage

[Partyvan]

Sorted my headlight gap out with these 3d printed headlight blanks. There's a cold air duct in one of them too, which lines up with the intake. And it's a 5kg weight saving!

[Partyvan]

I've also upgraded the ECU to a Hondata Kpro, supplied by Jcal. For those of you not familiar with Hondas, it's a modified OEM ECU to provide a USB link, so you can map it. It's very user friendly and does lots of useful things like reading sensor values, datalogging etc.


upload pic

This will hopefully enable me to fault find a running issue I currently have.

[Bright Halo]

Looking really good and sounding nice as well.
In your Cadwell video both the bucket seats seemed to be moving around a lot, are they fixed in ok?

[The Rotrex Kid]

Great work. Is JCal going to map it for you?

[Partyvan]

Bright Halo said:

Looking really good and sounding nice as well.
In your Cadwell video both the bucket seats seemed to be moving around a lot, are they fixed in ok?

They're moving for 3 reasons. First is they're fibreglass so they flex quite a lot. Second I'm really fat and third there were some really high G-forces. It out corners everything it's come across by a huge margin.

The Rotrex Kid said:

Great work. Is JCal going to map it for you?

It already is mapped by Jcal, that's who was at the rolling road mapping day above.

[The Rotrex Kid]

Ah yeah, I didn't see that! Good chap.

[Partyvan]

The Rotrex Kid said:

Ah yeah, I didn't see that! Good chap.

Thanks!

[Partyvan]

Just an update on my CRX's weight saving programme

Phase 1 is now complete:
Bespoke lightweight wiring loom
Aluminium calipers
Titanium exhaust
FRP wings
FRP bonnet
FRP bumpers
Sunroof delete
Headlights delete

Phase 2 is now underway:

Firslty these are on order from Radical. I am going to completely remove the door wiring and also look at removing the boot latches / hinges.


Secondly I will be installing perspex windows

Thirdly I will be making some detail weight savings with titanium fasteners, changing the intake pipe to titanium etc

I am hoping for a mega low kerb weight

[Partyvan]

Panels have arrived! Mega light.

[The Rotrex Kid]

Nice! How much lighter are they?

[Partyvan]

The Rotrex Kid said:

Nice! How much lighter are they?

The OEM boodlid is well over 30kg with glass. The glass extends to the vertical face as well, adding more weight. The new bootlid is under 2kg, maybe ~5kg with acrylic windows in it.

Doors are less of a saving maybe 15kg each side as I'll be binning all wiring, regulators, glass and of course the steel.

[The Rotrex Kid]

Good stuff, that’s a fair old saving on an already light car.

[J B L]

Partyvan said:

The OEM boodlid is well over 30kg with glass. The glass extends to the vertical face as well, adding more weight. The new bootlid is under 2kg, maybe ~5kg with acrylic windows in it.

Doors are less of a saving maybe 15kg each side as I'll be binning all wiring, regulators, glass and of course the steel.

Blimey. We're going to need a bigger wing