Hi iv got a u8 ecu in my classic turbo 1994 wot is a good replacement for a straight swop

None you should get a proper reprogramable one. But it you don't have £800 you could drop a z4 in it, extra 20 ponies it's an aggressive ecu I've been told (ignition advance) . 

Any problems with it

Risky. In my opinion 99 octane is a  must it raises the fuel cut and boost a little. You don't won't detonation. Don't tell anyone but I've got one in mine 😅

Just google Subaru z4 and the specs will be there 

I'm only running on that anyway do you think there is any point if I'm going to get the esl bord

Go straight to esl if you can no point messing about. I want to as well but I just haven't had the time or money. I plan to get a proper job done but I saw a z4 on eBay for £40 so I slapped it in just to try it. While I save for a proper ecu 

yeah just banging a ecu in is pretty silly really , they will go pop but the z4 is pretty safe as factory map etc should only get a little bad detonation 

I think the z4 runs yellow 440 injectors and a tdo5 16g.

your 94 runs grey 380's so give both the z4 and your scoob a google first to make sure you have the same turbo and injectors first. As it will over fuel or over boost if they're not the same [emoji6]

I've never taken the chance with a ecu lottery and always waited until I'm ready to remap before changing anything . It can get very expensive cutting corners on mapping if it goes kaboom

If it's not broke .....upgrade it 😊

I think the z4 runs 380 injectors not 440 savage.

Your right savage it's not worth playing the lottery with your engine. I'm still trying to find an apexi ecu it's the one I really want plus my turbo is apexi also 😊.

 But to answer the initial question z4 is a fairly 'safe' swap. But not worth it in the long run. 

Yeah I wasn't 100% sure what the z4 or the op scooby's model was so thought I'd mention too google em first .

I'd probably be tempted to try a z4 if they matched but then that would be on my own car and if it went bang it would be my problem.

I never advise anyone else to take a chance on unmapped mods . As 20 yr old performance engines sometimes go bang on the standard map if 1 of the previous owners has mistreated it at some point in its life .

If it's not broke .....upgrade it 😊

Agreed mate. I stuck one in mine just because if it goes pop I have the tools and ability to pop a new engine in. But would recommend a professional remap. 

Well I'm going to get the esl in a month or two and have picked up a z4 for £30 so will give it a go for a short while just take it easy I think

Just put my z4 in and it runs like a dream pulls well and feels good had a fue little problems with the u8 and this seems to of stopped all of them