turbocharging a standard A+
Turbo Mini Forums

hi,
I am in the process of building an engine in my head, before going back to the UK to gather the pieces I need.

I want to use a T2 and the mirage mainfold package on a standard A+ engine with a 10:1 compression ratio.

How far could I go with out going internal on that thing?

My thoughts were to get a Metro turbo head with modified chambers to lower compression, don?t know how low I could get it... any ideas?

Then with a good intercooler and boost retarded ignition, I?ve been dreaming off possibly getting away with up to 10 psi...
not sure if that is possible at all, bearing in mind that it will be run on 100 oct fuel

And finally, what sort of boost retard are you guys using? I have been looking at an MSD ignition module

Check out the boost retard units that TurboDaves mate Graham is building. Perfect for the job.

Id look for a lower compression 1275 to be honest. Just a std HLE or something is a lot lower than 10:1.

Any 1275 head will do the job. It all depends on what CR you can get down to. Bear in mind a std mg metro is 9.4:1 and that can be run upto 10psi with careful ignition and mixture settings

As iain say you need to start with a lower CR than 10:1...

Alex

AlexF

Speeking from experience 8.5 cr is a good one to go for, room for more than standard boost and nice off boost drivability.

I was 12 psi unintercooled with that set up.

Rolling road tune essential.

Jon.

So, new pistons as must. I might just build up a new engine in the UK and ship it over next summer... could be fun!

Any info on the internet about that boost retard unit??

you'll need to do a search on this forum, there has been a couple of posts about it, and it sound just the job!

New pistons arent a must at all. There are std mini/metro 1275 engines that run a lot lower CR. cant remember which ones, HLE springs to mind but not sure. With an increased chamber that should be fine.

Cant remeber who it is runs a std mini engine and pistons, i.e. not a turbo one, and is quite successful.

Saying that a short motor fully rebuilt and assembled where i get my machining done (with omega cast turbo pistons) is ?650.

?650 for a short motor! thats well cheap :)

iain you have PM

thanks for all the advise!

I've used several types of piston.

Give me a call if you like on 01953 888936 to have a chat about your engine build.

Richard.

Mirage Motorsport