18-03-2019, 01:32 PM
There aren't really any easy gains with this engine I'm afraid. By 'flash tubes' I assume you mean 'flash tuning' of the ECU. The Bosch MP5.2 in these can't really be mapped (from what I've read) or adapt to very significant changes to the engine. Taylor engineering, in your neck of the woods, did (don't know if they still do) a very mild regrind of the camshaft which they claim just about works with the stock ECU. http://www.taylor-eng.com/xu10j4rs/306_camgrinds.htm . Anything else you're looking at significant spend on aftermarket ECU in addition to any engine changes you make.
Some people look to swap to a GTi6 inlet & exhaust manifold. That might make sense in the context of other changes to the engine but from what I've read I'm not convinced they make any difference on their own. See discussion below.
https://www.306oc.co.uk/forum/showthread.php?tid=37055
Finally, I've seen very knowledgeable people state multiple times on forums that going down the route of making big changes to the XU10J4R doesn't really make sense …..much easier & cheaper to just drop a J4RS lump in (with stock GTi6 ECU).
The XU10J4R is definitely no screamer but it's a half-decent, solid engine that moves you along at a good pace if in good condition. Make sure it's still making good compression & everything around the engine is in good order (sensors working well, breather systems ok, injectors tested & cleaned, plugs ok etc) before rushing to find more power in other ways.
Some people look to swap to a GTi6 inlet & exhaust manifold. That might make sense in the context of other changes to the engine but from what I've read I'm not convinced they make any difference on their own. See discussion below.
https://www.306oc.co.uk/forum/showthread.php?tid=37055
Finally, I've seen very knowledgeable people state multiple times on forums that going down the route of making big changes to the XU10J4R doesn't really make sense …..much easier & cheaper to just drop a J4RS lump in (with stock GTi6 ECU).
The XU10J4R is definitely no screamer but it's a half-decent, solid engine that moves you along at a good pace if in good condition. Make sure it's still making good compression & everything around the engine is in good order (sensors working well, breather systems ok, injectors tested & cleaned, plugs ok etc) before rushing to find more power in other ways.