I have read somewhere that the 1.3 Copen shares an engine with the 1.3 Yaris of the same age. So any opinons of whether the exhuast manifold form the Yaris might fit? There are a few knocking around andthey look better than the Copen ones. I have seen the thread on this forum talking about fitting the Sirion exhaust manifold but couldn't find any of those. Would be interested to hear what people think.
__________________________________________________________ I have a 659 turbo Copen but I've had 2 Sirion GTvis & they can toast any Yaris. Ordinary Sirion manifolds connect to a 3cyl engine so you'd have to find a Sirion GTvi. For the record, a bog standard GTvi, weighing about the same, can do a 9.6sec - with no improvements. As far as I know that's just another flavour of Toyota/Daihatsu's 1.3. Daihatsu took the Yaris 1.3 & their engineers went to work on it, making it a proper "warm" hatch. As such, I think if you can find a manifold from a Sirion GTvi then that would be the best. Caveat: GTvi manifolds are integral to the cat system, due to space, but this might be a good thing. However, unless you can put it on a hoist & do the work yourself, swapping manifolds on a Copen is a very expensive way to make a small improvement. My exhaust guys said don't bother trying to swap manifolds on my GTvis, as it's really hard to do & makes bugger all difference. It'd be much better to find a GTvi at the wreckers with a good engine, just do a straight swap, then sell your engine to some Yaris bloke. For now I'd definitely get rid of the OEM air intake & replace it with a direct cone filter, then go a straight through 2"exhaust. You aren't going to make a 1.3 Copen into a Golf GTi no matter how hard you try. I've had to give up on that with my 'normal' Copen, but I can at least match a standard 2.0 Golf now so I'm happy. Hope this helps, Brian.
_____________________________________________________ Further to my suggestion of changing the [invariably crappy] OEM air intake unit, I found this post that might be of interest to you from 'The Technician" in Birmingham & posted in March 2020. 1300cc Copen Induction Kit I'd have a word with him about all this. Cheers mate, Brian
___________________________________________ One last thing MCP. You know that useless big briefcase sized "luggage" bit under the folding roof? To counter the front heavy 1.3 Copen's tendency to plow on in corners, which I'm assuming is similar to the same weight GTvis, I'd put some bags of sand in it. Don't exactly how much, bit I used to stuff 25-30kg of sand around the spare tyre on my GTvis. It really fixed the nose heavy problem & made it much more responsive to steering inputs in corners & roundabouts. A very cheap fix to experiment with, even if you don't notice an issue. You would, I'd expect, notice a positive difference. Anyway, let me know how your plans work out. B
