LS1 220/224 profile cam and emissions question?

[stigmundfreud]

Looking at the putting the CompCams XR273HR cam (220/224) -http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=1087&sb=2 into my LS1 engined Monaro

As budget is an issue I am forgoing the head upgrade now and will save for the future but if the results from cam only match what I am aiming for then I will hold off.

The car is running with long tubes and 2.5 system with sports cats.

The question I have is for emissions more than anything. Tuning stoich won't be an issue but they measure CO and HC and this is where I am unsure. I beleive the current requirement is to be within the following:

fast idle (2500-3000rpm):
CO=0.3% volume
HC=200ppm

idle:
CO=0.5% volume

I know its a finger in the air type question but I'm sure someone ehre will know. Should that cam profile into an LS1 be possible to pass through emissions? I'm not sure if the Monaro was type approved so i have to assume it is and for the MOT must conform to the posted emissions

[stevieturbo]

you would really be better asking on the US forums, or also Aussie.

I'd say there would be limited experience in the UK with such matters.

[stigmundfreud]

asked on USA got told to ask in Monaro Left a message on ls1.com.au but no reply as yet

[eliot]

stigmundfreud said:

asked on USA got told to ask in Monaro Left a message on ls1.com.au but no reply as yet

lol

[stigmundfreud]

eliot said:

stigmundfreud said:

asked on USA got told to ask in Monaro Left a message on ls1.com.au but no reply as yet

lol

YOU!

[richard_abra]

www.ls1tech.com

[ringram]

US doesnt do emissions.

Neither do Oz. Only really Cali (well ok one US state) and they say a 224/224-114 passes ok. Some say you can go a little larger.

Also I understand Gareth passed with his cam which is larger than yours. PM him he will confirm.

[stevieturbo]

Also...given the flexibility of the MOT system in England etc....I guess somewhere will pass it fine.

[Boosted LS1]

I'm sure I put that cam into one of the marcos tso engines and they got it through sva or whatever they had to do with new cars. It had to have a few tunes on the ecu iirc which was an mbe.

[eliot]

Boosted LS1 said:

I'm sure I put that cam into one of the marcos tso engines and they got it through sva or whatever they had to do with new cars. It had to have a few tunes on the ecu iirc which was an mbe.

The testing isn't as rigourous with SVA IIRC. Just falls into post ~1994 cat equiped levels, which are easy to pass if you have a cat.

[2woody]

either way up, the fuelling requirement will have changed - to which you should alter the fuelling provided. emissions will be corrected that way !

[stigmundfreud]

2woody said:

either way up, the fuelling requirement will have changed - to which you should alter the fuelling provided. emissions will be corrected that way !

only so far as lambda is concerned, the mixture difference of air/duration/fuel amount will have a chnge on nox, co and so on which is what I was looking for clarification on. seems the 114 should be fine