New SL-C owner

chesneydtec · Jun 3, 2014

Long time lurker but couldn't help but jump in. I have extensive knowledge and experience with transient emissions testing such as IM240. So hopefully I can shed some light. If you could share with me the cut points for the interest gasses, CO, HC and NOx that would be a good start. Then provide the test results and any data that the test center may have shared. The primary cause of high tailpipe NOx is poor fuel control or, better stated, inaccurate feed gas to the front of the cat. While high temps can sometimes influence NOx it is typically not an issue. As well NOx is created at all temps. They just tend to spike at mixtures leaner than Lambda of 1.000 and the cat can't reduce them if the AFR is leaner than 1.02. The reason the stock LS3 cam works is the PCM can now maintain the feed gas to the front of the cat in a range that allows the reduction process in the cat to work. It may be possible to tune the existing configuration to run at Lambda of 0.995 +/- 5% under the limited driving conditions of the IM240 which would provide the correct feed gas to the cat. All this is assuming the cat is working and is robust enough to handle the overhead of the LS3. Matching cat size and structure as well as precious metal loading will determine success no matter the situation.

So if you can provide the data I asked for above I'll review and may be able to determine if there is a chance of passing with the current cam. Loose cut points can help in this matter. Look forward to playing.

StuM5 · Jun 4, 2014

Firstly thanks to everyone who contributed and sorry for not responding to what each of you have offered. All advice is noted.

Henry,
my own mechanic friend, who imports many vehicles to Aust and is always doing IM240 looked at the spec’s of LS376/480hp engine and said exactly what you've said…change the ‘cam’ back to the standard 430hp version first.
I will talk to the IM240 tester about it in more detail.

Chris, I appreciate the offer. I have requested all the data recorded and what the ‘cut points’ are, unfortunately I’ve just discovered the ‘tester’ is on annual leave till mid June. Hope someone else there can get me the info.

cheers
Stuart.

Trent · Jun 4, 2014

Oops I thought it had the 430hp cam in it. Mabey the E85 will get it through depending on overlap and tuning but as ChironWSC said its probably cheaper/easier to put the 430 cam back in.
And no a rotor wont pass the current gas limits. They will only pass up to the early 2000's with no porting.
Im planning on a ls3 after almost 20 years of owning/building rotors.
(stopping hi-jack now)
For emissions passing in Sydney mat (aka hitman injection tuning) is the man to talk to if he's still doing it. He tuned all our cars for years and then switched to just emission passing and had a constant Monday booked at Penrith testing station. He now works for haltech but I think he still does a bit of emissions stuff. If your having trouble finding him call race solutions as maroon the owner is his brother in law. If you really need a hand pm me and ill get in touch with him.

StuM5 · Jun 5, 2014

Thanks Trent!
Streamline Automotive have a full IM240 certified dyno (thus no need to go to the RTA/RMS testing stations at Botany or Penrith) Streamline are the ones who ran the initial IM240 test and will perform mods and tuning to get it to comply.

Thanks to this forum I'm now better informed so I can converse with the tester on the topic and how to achieve the results. To be honest, I've not had an 'informed' chat with the tester as yet about the whole process.

We need to change exhaust to meet decibel limits so may as well throw Euro4 cats on, the cats should assist in bringing down NOx by around 10-15%. Without the data or the 'gas cut points' I don't know how many % we have to bring NOx down by.

Thanks for responding!

Trent · Jun 6, 2014

Emissions is a bastard!
Last time I had anything to do with it there were no other places than botany and Penrith and the waiting time to get the car tested was 3 months :shocked:.
With a 430 cam, good cats as close to the engine as possible, standard tune and E85 you should blitz it. Don't know if you have closed loop o2 but you should have it on anyway. I would also look on the ls forum because they will definitely have some threads on it.

StuM5 · Mar 12, 2015

Update:
The SLC was certified for NSW registration back in December 2014.
The engine tuner managed to get the LS3/480hp engine tuned to comply with all emissions without having to change back to the standard 430hp cam. This was all done on pump fuel, it did take many hours of tuning though.
The SLC was also put through numerous other tests including decibel testing and brake testing (for which we had to hire an airport runway!)

Here are some pic’s of car with new number plates. We also had to change another item on the exterior of the car that didn’t comply with regulations, can anyone pick it from the photos?

http://mrc013.com/post/109728425845

http://mrc013.com/post/109728425845

There were numerous changes that had to be made to the car to get it passed NSW registration… this included remaking the door hinge system in high tensile steel and bolting the hinge system to the chassis to add strength.

I took the SLC to the race track for the first time a few weeks ago, what a blast!
Unfortunately my fun was hampered by the engine oil temp going through the roof. If anyone intends to spend anytime on the track with their SLC I suggest you include an external engine oil cooler in your build.
The SLC is currently having an external engine oil and transaxle cooler installed along with an Accusump system.

The SLC will be appearing on a national Australian TV program within the next few months. The series starts on 21 March and runs for 12 episodes. Here are all the episodes from last year https://www.youtube.com/user/cartorquechannel/videos

They filmed the SLC on the road and race track and I can’t wait to see how the footage turned out. The only down side was me being interviewed about the car, I hope I got all the facts right (I know I got brake rotor size wrong by 5mm but hopefully that gets edited out!)

The workshop doing the fab work for the oil coolers etc has documenting the build and I will post photos/film when done. They are also performing a few other alterations which you’ll see when photos/film is done.

Cheers
Stuart
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Eric McClellan · Mar 12, 2015

Hey Stu, can you get a close up pic of your dash? Curious to see how they laid out the buttons/switches

P-nut · Mar 12, 2015

StuM5 said:
Update:
We also had to change another item on the exterior of the car that didn’t comply with regulations, can anyone pick it from the photos?

Looks like they made you close out the external fuel filler, or make a door to cover it.

Do I win the Internet? :laugh:

Edit: on closer examination, it looks like a stock door after all. I admit defeat!

Subsequent edit: Did you change mirrors? Looks like the original ones were swapped for what looks like ones with more area.

Mesa · Mar 13, 2015

A front plate.

prothct · Mar 13, 2015

Turn signal light on the front fender forward of the door. Starting to see these in the US also. That's a gorgeous red!

Howard Jones · Mar 13, 2015

Do you have any pictures of the door mounts attached to the chassis? I would love to see them if you do.

Pow3r · Mar 14, 2015

The exterior mirrors are larger

StuM5 · Mar 19, 2015

Eric

I took a quick pic this morning sorry for poor quality. The button without a symbol is the 'Horn' and the top left is 'seat belt' light, goes out when seat belt is engaged.

[URL=http://s553.photobucket.com/user/580madness/media/SL-C/IMG_2243_zpsaofwu9ob.jpg.html]

[/URL]

Will, Mesa, P Roth & AJ
The door mirrors have been changed to series 6/7 FD RX7 mirrors
That turn signal forward of the door also needs to be there for compliance purpose.

Howard,
I've asked for photos of this, will post when received.

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prothct · Mar 20, 2015

There is quite a few nice details to this SLC. I like the center brake light in the lip of the tail. Are the LED tail lights surface mounted or recessed in?

StuM5 · Apr 22, 2016

Thought I’d update this post.

I’ve now thoroughly enjoyed 13,600kms (8,450 miles) of driving on the SLC.

One problem I encountered is one of the lift kit connectors is made out of nylon and because of that it has started to weep the hydraulic oil.
I have now replaced this with a metal fitting and connector. The unexpected added benefit of this is that it has halved the time it takes to reach maximum lift.
Worth doing if you ask me.

]

I also suffered a radiator core failure. As the core heated and expanded it came into contact with the end tanks and over time it destroyed the core causing it to leak.
These seemed to have been caused by the core and end tanks were installed in relation to each other along the radiator mounting system being too rigid.
I had a friend fabricate new end tanks and install a new core to prevent this from reoccurring, he also designed a mounting system that allowed the entire system more flex.
Also changed to a cross flow radiator cooling method and new fan shrouds.

I had already installed external coolers for both engine and transaxle oil. Problem is they were so efficent that in cooler weather they were taking forever to get up to operating temp.
I installed the Improved Racing thermostats. 82 Degrees C for engine and 47 degrees C of the Ricardo.

Had the air intake hydrographically dipped in carbon fibre, I think it came out pretty good.

Some other shots

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Scott R. · Apr 22, 2016

Very cool. Thanks for coming back in and sharing fixes.

PeteB · Apr 22, 2016

Great pics Stu! Thanks for sharing.

IanAnderson · Apr 23, 2016

Love the number plate!

New SL-C owner

ChrisChesney

Stu Coleman

Trent

Stu Coleman

Trent

Stu Coleman

Eric McClellan

Will Campbell

Mesa

P Roth

Howard Jones

A.J. Schreder

Stu Coleman

P Roth

Stu Coleman

Scott Rowland

PeteB

Ian Anderson

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