156 2.0 JTS, Full Supersprint system - Alfa Romeo Forum
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Tuning & Upgrades Discuss performance enhancements for your Alfa Romeo

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(Post Link) post #1 of 22 Old 04-05-13 Thread Starter
MGG
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Idea 156 2.0 JTS, Full Supersprint system

Well it has been about a year since I last posted anything on here

But now I am about to get a full supersprint exhaust system followed by a remap for my little 156 2L JTS.

You may wonder am I doing this to a 2L; well the answer is rather a long story. But the short of it is that the catalytic convertors replaced last year are failing mechanically again because of poor workmanship.

I do have one question I thought I might ask. As I am going to be remapping the car soon is it worth getting a performance filter like this or an induction system like the CDA before the remap or are they just not worth the hassle?
If the CDA system is any good does anyone know a company that would promptly ship one to New Zealand?

Also if anyone has done any similar or related mods and would love to here how they went.


Oh and just for a laugh: When I go to lock or unlock my car sometimes the boot/trunk now opens. I love my Alfa.

(Mechanical Engineer + Mechanic - Alfa)*time = ln(Bad News)
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When you say the cat is going again, was it a second hand official alfa cat or a none alfa after market one?
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(Post Link) post #3 of 22 Old 04-05-13 Thread Starter
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They were generic aftermarket cats welded in where the old ones once were. Due to poor workmanship, low quality components and bumpy Christchurch roads they failed.

They worked without error for about one year.
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Autopassion?
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(Post Link) post #5 of 22 Old 07-05-13 Thread Starter
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Yes I will be using Autopassion for the remap, the rest I will do myself. I am in the process of ordering the system from Supersprint; they are even looking into supply the OE manifold to engine gasket for me so that I can save on shipment.

I have learnt one good lesson: Never take your car into pit stop for slightly more complex exhaust repairs.
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Let me know how you get on with Supersprint. Thinking about it for my car. Autopassion remapped my car 3 weeks ago. Really happy with the results. Basil is a good rooster.
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(Post Link) post #7 of 22 Old 09-05-13 Thread Starter
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Supersprint have been good so far, they have sourced a OE gasket for fitting the exhaust to the engine and now all I am waiting on is for them to set up a paypal link so I can purchase the parts.

In hindsight I would have purchased the gasket from Alfa Workshop in advance.


If you ever need a part for your car, buying from Alfa Workshop in the UK can easily save you both time and money if you know what it is you require.
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(Post Link) post #8 of 22 Old 29-05-13 Thread Starter
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My Supersprint system arrived nicely packaged on Tuesday.

As I was being extremely fussy the whole system took me just over a day to fit. It went on with only a few minor issues, the manifold's hanger was about 4mm out, the rear muffler hangers hand to be bent slightly to centre the tail pipe and the rear centre pipe's hanger had to be ground off a little. Those really weren't big issues.

Performance wise there is a noticeable difference but only if the car is being driven through the gears. There is definitely more power in the high rpm. As the car seems to be more responsive than before up hills I think I may have increased the mid range torque.

Sound wise, the car sounds deeper especially below about 4000rpm, at which point the sound becomes higher in pitch.

The only issue I have with it so far is the awful weird burnt smell. I think the smell is a combination of the new exhaust system burning off and the lack of a catalytic converter. I am hoping that after a decent run the smell will die away.

If anyone has had a similar experience with the smell of a new exhaust I would like to hear it for my own piece of mind.

I will post pictures and maybe a video later.

If I was asked was it worth it? I would definitely say yes but I would also say pay more if you can and go for a high flow cat, if there is one; in my case there was no optional catalytic converter.
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(Post Link) post #9 of 22 Old 29-05-13 Thread Starter
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Images below.

And yes the exhaust pipe does extend by about 10mm when its warm.
Attached Images
File Type: jpg IMG_0940-2.jpg (90.4 KB, 62 views)
File Type: gif IMG_0890-2.gif (190.8 KB, 189 views)
File Type: gif IMG_0943-3.gif (187.1 KB, 62 views)

Last edited by MGG; 29-05-13 at 13:07.
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(Post Link) post #11 of 22 Old 30-05-13 Thread Starter
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Here is the link to the photo audio video I made: Alfa 156 2L JTS Supersprint Exhaust - YouTube
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(Post Link) post #12 of 22 Old 30-05-13 Thread Starter
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...and here is a video of the rev counter: Alfa 156 2L JTS Supersprint Exhaust Acceleration - YouTube
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From the pics - I cannot see the lambda's. Are they in place?

The smell will go away yes. As said combination of the new piping and the ECU needs to re-learn... to fast track that - do a throttle reset: https://www.alfaowner.com/Forum/south...ml#post4766240
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(Post Link) post #14 of 22 Old 01-06-13 Thread Starter
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The lambda's are currently tucked away to act as resistors for the heating circuit. The lambda signals are simulated by a circuit I made.

Interestingly my throttle body packed up yesterday, possibly because I didn't do a throttle reset. Anyway the throttle motor looked like it had been working overtime causing carbon to build up on both the motor's and sensor's brushes.
I cleaned up the throttle body then did a throttle reset and the car seems to be going ok; only time will tell though.
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You have no lambdas installed at all or just the front two are installed?
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Nothing to do with exhausts or what have you but i love NZ. christchurch especially. Nice marble plaque in the town centre saying that the settlers left gravesend all those years ago.....
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(Post Link) post #17 of 22 Old 01-06-13 Thread Starter
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Ah yes, I still have the pre cat lambda's. I don't want to mess with those.

Christchurch is nice I suppose. There are a few too many bumpy roads and roadworks these days. There also seems to be a shift in the gender ratio due to all the male workers coming in for the rebuild
It will however be interesting to see what the city is like once the rebuild is complete.
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How did you solve the issue with the post cat lambdas in detail? Sounds quiet interesting
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(Post Link) post #19 of 22 Old 08-06-13 Thread Starter
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Take a look at this thread: How smart is the emissions management system

If you do try this make sure that everything is wired up to the ECU correctly and a fuse is used. I ended up by using the original O2 sensors heating circuit as I couldn't get resistors to work.

I would recommend installing a high flow catalytic converter for the smell if you have the option.
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Did you get the remap in the end?
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(Post Link) post #21 of 22 Old 10-09-13 Thread Starter
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No I fooled the oxygen sensors in the end but sold the car soon afterwards after an unfortunate break down involving a throttle body. The car was fine after I fixed it but I had had enough of working on it.
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I have also SS centre and rear exhaust, but I have upgraded original catalysts ... Now they are 200 cpsi metallic ... Lambda also works great ...

I prefer this way to mantein the back pressure generated by catalyst ... Without them I think combustion chambers are unloaded too fast ... You can lose power at middle revs ...

Sorry for my english ... I hope you could understand what I wrote
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