what size exhaust tube/elbow etc for my setup?
 

Ok so my cut'n'shut DET manifolds now finished (see thread http://www.nissansilvia.co.uk/vbb/showthread.php?t=1466 ) so nearly ready to trial fit it to the car ready to make a new elbow, downpipe and exh system. My question is regarding the bore of tube to use. Bit of background on the spec and what its used for may help with your suggestions.
its a CA18ET as in the S12s with Autosprint cam, flowed head, KA t/b, CA20E inlet manifold running 444s, forgies and steel rods, with a turbo technics T28 lo-lag hybrid, all controlled by an Emerald aftremarket ecu. Its used for sprints and hillclimbs, so response is key rather than out and out power but that said dont want to restrict the motor if i wish to up the boost again:p
currently runs 250brake at 16psi but looking to run bit more possibly?....

current system is 63mm (2.5"), will that be enough or do i go 2.75 or 3"?

Ive got a elbow now (cheers Mike:cool: ) thatll be cut up for the flange and the lambda boss.

Hi Craig. I reckon 3 inch but other people that are in the know will advise you better.

Was wondering where you got your 'autosprint' cam from and whats the difference from this one to a piper and standard? In the process of getting a cam so i can finally fit that vernier pulley i purchased off you some time ago.

cheers

Paul

Hiya Gripo:D
cheers for that, thats what im thinking too.

Autosprint cam is a regrind by Autosprint in Coleshill, nr Birmingham. They did all the balancing on my engine and rebore etc. I havent got the specs of the cam, it was all abit a) hush hush b) above my head anyway lol. The guy at Autosprint, Geoff, looked at the silvia engineering cam (i assume Piper) that was in the engine i blew, and worked from there. its deifinitley different to the eye than the Piper and has non-symetrical lobes with a flat on the downside of the lobes. Dunno why, its a trick they used on ford pinto profiles amongst others. A few of the guys that have fitted them since, have noticed the engine bretahes better at the top end of the rev range and stops that slightly strangled feel. Ive never measured the lift or duration etc or done back to back with teh piper, but it works very well in my engine. its a bit more expensive i think than the piper, about £120 iirc. Turbomike has one for sale i believe if you PM him.

personally i would go 3" as you expect to use more boost,you only have half a exhaust to make anyway:D

im actually gonna go all soft in my old age and have the exh sticking out the back again rather than the passenger door:D . It wont have any silencing tho, well not to start with, and then only if the sound police at events get the arse and make me put a silencer on:(

oh yeah did i mention it will have a passenger seat again, and will be road legal (well have tax MOT and insurance anyway:D )

On the road
 

Sounds t like that will be a bit lively on the road i bet lol!!!:D :D

no you didnt:) ,is anybody brave enougth to get in there then:confused: :eek:

http://www.ss1turbo.co.uk/photo.htmfound craigs car on here.

im only gonna fit the spare seat for track days really and it will never be run on the road as it only has a 2 gallon tank.