Adding Cosworth Barrel Throttles to a SBD 2.3 Duratech

[John B]

Hi All,

I have an '03 SV with a 235hp 2.3 SBD Duratech with SBD butterfly intakes. The car currently runs great. It's very tractable and powerful, but as usual, too much is not enough...

 

I'm thinking about adding a Cosworth barrel throttle and map. I think this may yield an additional 10hp or so. Has anyone on the board done the conversion? What all is involved? did it work out??

[yellowss7]

John, I have a 2.3L Cosworth with the Roller Barrel Throttle bodies and SBD provided some uprated Cams and mapping to get it to 310 hp according to the prior owner. Steve is now reviewing my map after some recent work to ensure that it is properly functioning.

 

If you are looking for more Power, I'd give Steve a call and see what he recommends. I'm sure he can find a way for you to spend a few more dollars for a few more Ponies.

 

Tom

[John B]

Thanks Tom, I just sent Steve an introductory email.

 

310hp, I like that number!! What compression ratio is that? Race gas I presume? Does it have a forged crank and pistons? Keyed crank?

I'm not sure what the internals of mine are, Steve can probably help with that. I think I'll use the car 75% street, 25% track, so will want to stick with 93 octane pump gas.

Edited May 17, 2016 by John B

[yellowss7]

Yes, it's a big number for a little car. Karl, the original owner, spared no expense when building this car. The motor is a Cosworth built 2.3L, Duratec, with 13:1 CR. So definitely 100 Octane race fuel. Forged Rods, crank, ARP everything, Billet Crank, keyed of course and the current map has a soft cut at 8600 rpm with a hard cut at 8700. Just NUTS!!! Then after all that, he had Steve at SBD, send over some radical cams that required some machining of the head to get enough clearance. Definitely over the top.

 

SBD says that it is go to go on 98 RON gas, which is about 93 or so in US terms, but suggested since I'm running it on track to play it safe. At $12 a gallon, its still probably cheaper than burning a piston or two. :ack:

 

Don't go crazy, it's only good on the Straights and the turns are still where the fun is. Hope you'll bring it out to NJMP with us one of these times. Let Croc or I know if you are around and we'll bring you in as a guest for a members day if you can't make the July gathering. Tom

[John B]

Wow, that sounds fiesty!

I'm a member of NJMP and am definitely looking forward to bringing the Caterham down for some fun this summer. Maybe T-Bolt 5/21 or 22.

I think I met you there last summer before I purchased my SV. You and Doug P both had your Cats at Lightning while my son and I were racing at T-Bolt. We popped over looking for Doug and had a brief chat.

[yellowss7]

John, I am planning on going on the 21st and 22nd, although Saturday is looking a little iffy. I'll have the Yellow car that weekend as the Orange one is waiting to get the map refined and still has to get on a dyno to finalize the tune after the work I just had completed.

 

See you at NJMP. Tom