|R500 standard exhaust.
|Springs holding catalytic converter and collector to manifold.
|R500 catalytic converter and exhaust collector ready for removal.
|Caterham R500 catalytic converter with guard and lambda sensor in shot.
|Caterham R500 catalytic converter being weighed in at 3.3kg
|Caterham R500 cat bypass pipe at standard length weighing in at 1.49kg
|Loosing off these header pipe bolts allows easier fitment of collector pipe.
|Cat bypass pipe fitted to Caterham R500 Duratec.
|Exhaust system re-fitted with cat bypass pipe and standard R500 silencer.
|Caterham Carbon Track Day Airbox - weighs 1.06kg
|Caterham Pipercross air filter - weighs just 384g.
Then it was time to fit the Raceco silencer. I placed the Raceco silencer on some cloth and next to the standard R500 silencer and you can see how much larger the Raceco can is.
|R500 standard silencer next to Raceco titanium silencer.
|Raceco Titanium Silencer - weighs 5.5kg
|R500 Standard Silencer - weights 5.7kg, 200g more than the Raceco Titanium version.
|Caterham R500 Cat Bypass Pipe marked up ready for cutting.
|Cutting the Cat Bypass Pipe with my Dremel.
|Cat bypass pipe cut, after first cut, de-burred and fitted.
|Cutting another 3cm off the cat bypass pipe with my Dremel.
|Cut cat bypass pipe, now weighing in at 1.1kg
|The inside of a brand new R500 Duratec Raceco Titanium Exhaust.
|Raceco Titanium Silencer fitted to my Caterham R500.
|Raceco sticker fitted to silencer.
As I'd weighed everything I thought I'd total up what the before and after weights are.
Pipercross Air Filter - 384g
Carbon Track Day Airbox - 1066g
Catalytic Converter (with guard) - 3314g
Cat Bypass Pipe (uncut) - 1490g
Cat Bypass Pipe (cut to length) - 1162g
Standard R500 silencer - 5.7kg
Raceco Titanium silencer - 5.5kg
So my old setup of the Pipercross air filter, catalytic converter and R500 standard silencer weighed 9.4kg and the new (track day) configuration now weighs in at 7.7kg - so that's a 1.7kg saving. I think I'll order myself another cat bypass pipe and run that with the standard exhaust and pipercross air filter for road use as not only will it sound amazing, it'll also be 7.3kg which is 2.1kg lighter (all due to the cat!)
The Noise Reduction
A couple of days ago I went to Maplin and bought a cheap decibel monitor to measure the results of each possible configuration of the air filters, collector and silencer pipes. Turns out I spent about 2 hours recording video of startups, 5,000RPM revs (as this is the 2/3rds region for testing at track days) and fettling with the different setups to find out that Maplins' decibel monitor was absolutely rubbish.
So I decided to go for a blat instead, and remembering there were some nice tunnel noises on a blat I done on Wednesday, I went back to get some footage to compare the two setups. The setups were:-
1. R500 standard exhaust, catalytic converter and pipercross air filter
2. Raceco titanium silencer, cat bypass pipe and carbon track day air box
There's definitely a different tone between the two, and I prefer the sound of the standard exhaust - but that's ok as the Raceco (for me) is purely to ensure I get through the noise tests at track days.
|AP racing front calliper on Caterham R500.
|Blown 10 amp fuse.
|Fuse box with blown fuse removed.