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What mods can be done with out tuning ECU?


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#1 Josh18

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Posted 25 January 2019 - 01:48 PM

As the title suggests, what mods can I do to my early gen2 LGT, twin wastegate model? I'm not planning much at this stage but it would be good to know what I can do ie exhaust, filter etc with out tuning the untuneable old ECU. I'd like to put a more free flowing better sounding exhaust eventually.

Cheers



#2 Barbbachello

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Posted 25 January 2019 - 02:48 PM

Can pretty much do whatever you want apart from change maf or injectors. The older ecus tolerate mods pretty damn well and you cant replace the twins with anything big enough to outflow everything else.

Mod away


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#3 Josh18

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Posted 25 January 2019 - 03:05 PM

That's good to know.

As far as by feel performance increase, If I put better downpipes, cats, exhaust on it and a better filter would much change? The stock downpipes in particular seem super weedy and restrictive. I have read that just freeing up the exhaust will increase boost levels on its own. I have also read that relocating the boost control solenoid to the engine bay and shortening the lines helps the performance of the primary. Has anyone tied this?

Lastly, how similar is a WRX exhaust to an LGT? I realize that I would need to modify it to make it fit the TT but I thought maybe a big exhaust from a wrecked rex might be a good place to start.

Cheers and thanks for the info.



#4 Barbbachello

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Posted 25 January 2019 - 06:05 PM

Exhaust is always a good upgrade on turbos. 

GC8 catback will fit with about 10cm extra added. 3" catback with 2.5" dumps is the way to go. Dumps youll either have to do custom or import some from japan


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#5 Josh18

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Posted 25 January 2019 - 08:17 PM

Thanks Bab, that's what I wanted to hear, sizes too. I'm ok to fab the down pipes. Mine has a cat in the down pipe and another in the primary down pipe- do I need to run both to keep the ECU happy? I was thinking just one high flow in the centre pipe.

Also since Ive had it the O2 sensor for the centre cat has been unplugged. It has one plugged in in the in the primary down pipe and another somewhere maybe the primary up pipe. I cant find a corresponding plug for that rear O2 sensor. It runs fine but does it need it? I have seen cars before where they place an O2 sensor before and after a cat foe emissions or something that does nothing for the running of the car- is this that sort of thing?

Another thing I noticed when changing my primary turbo is that the up pipe diameter is much larger than the inlet of the turbo and the junction is all right angles. I don't know why they would do this but it looks like a major flow restriction- can the turbo inlet be ported?

Cheers



#6 Ordex

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Posted 27 January 2019 - 07:35 PM

the rear sensor is a temp sensor to warn you not to park on grass when it's hot :)

there should be a lamp for it on the dash that turns on when you turn on the ignition. Mine's never turned on other than when starting the car.

I've read around the place it'll run fine without the temp sensor. No idea what it actually does apart from operate that lamp.



#7 Josh18

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Posted 27 January 2019 - 09:26 PM

Thanks Mate. Yeah mine has just been sitting there with nowhere to go since I got it, doesn't seem to bother it, that makes sense.






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