R400 D Roller Barrell TB

[Jmracing66]

Hi all,

Can someone give me an idea of the cost to upgrade from standard to roller barrel throttle bodies on a r400 duratec ?

Cheers

[Caterhamdreamer]

Hi

Been looking at getting something like this as well.

The Roller Barrell kit is about £2200 plus fitting for the Caterham version. Apparently make a huge difference to driving pleasure.

Hope that helps.

[coppice]

I paid about that - it is worth it . Don't believe the naysayers who mumble that it seems a lot of brass for a small power increase; the car is utterly transformed by the upgrade. Much quicker, more responsive and that noise....

[k20erham]

Hi I know a lot fit roller barrels, but read up on roller barrels VS spindle /butterfly throttle bodies first, you will be supprised how they act differently, Jenvey have good info.
total inlet length, bell mouth area airbox volume, which exhaust, length of ex primiries, camshafts all go into the mix,get it right and the results will indeed transform the otherwise standard engine BUT there is a price to pay for the change and not just money.

[coppice]

And the price is ? Some say that RBTBs drink fuel-they do if you hammer it , just the same as anything else.

[k20erham]

In such a light car part throttle drivablity small throttle fueling is often superior with butterfly, rollers work best wide open and suit very high rpm and are more compact, thats why caterham use them, it's a packaging compromise. It's not about max power it's how it delivers from idle IE part throttle/ drivablity, I'm not saying don't fit rollers, I'm saying read up talk to expert mappers but your kit once and buy it right because lots don't

[coppice]

I just bought the Caterham upgrade without fretting too much as the reports I had seen were all positive. Ironically the second biggest difference is light throttle usability ; it also ticks over smoothly from cold which is more than it did before.

[forest07]

My last Caterham had a Duratec engine fitted with Jenvey's . If I had an R400 that's the route I would go as they never dropped out of balance and the engine was tractable throughout the rev range.

[DCL]

I've recently done some back to testing with the roller barrels and throttle bodies albeit for a higher state of tune.

https://www.facebook.com/Duratec.in.detail

The results were somewhat surprising. The roller barrels out performed the throttle bodies on this engine. There are many factors of course, but the roller barrels can more than hold there own and don't deserve the bad press they sometimes get.

[onward]

Had it fitted to my Supersport R - Brilliant !! well worth the £££ - The noise is the best thing - puts an even bigger grin on ya face,

[mic]

The roller barrels give no more trouble than Jenveys if they are properly fitted and the settings to the TPS and the barrels are right. With the R400 light throttle openings do not present any hesitation or kangarooing etc.