5 port turbos - can they take the punishment on a track?
Turbo Mini Forums

I am realistically not going to be able to afford or have the resources to do the k1100 turbo for quite a while so need to decide whether to stick with the n/a 1380 or to throw a turbo at it. The criteria for the engine are simple and I have nearly all the parts required to carry out the conversion just though hoarding stuff.

1. It can be used for track days - so sustained periods of full throttle, high revs ect
2. Will have power to 7500rpm - thinking gt17 or td04 and a pretty hot cam.


My only concern is really how well carb'd engines respond to say feathering the throttle round a corner, or say letting off at 5500rpm, then quickly flooring it again - the last thing I want do to is it to go lean and do head gaskets ring lands ect. A lot of the successful cars on here seem to have destroyed many an engine through detonation, and the last thing I want to do is follow suit hence the fact I ultimately want to go down the k1100 route.

Power wise I'd be looking for 170bhp to make it all worth while, which shouldn't be do difficult on a 8.7:1 comp ratio with lots of revs in a 1380. The question is essentially can the 5 port deliver what I want in turbo form or should I just hold out and do the 16v engine?


Thanks

Edited by minimole23 on 7th Jun, 2011.

Fiat 8v head?

Ah, ok,

I suggested it as they are dirt cheap and are much easier to convert, (already belt drive, and dont need piston cutouts)

not even started!

still need to get the 7 port back together first...

Its a very good question , and id love to see peoples thaughts on the matter.

rick

The head makes not a jot of difference to working on a track or road if it is set up correctly. Things detonate and/or blow up because they are poorly tuned not because the head is of a different configuration.

I've never had a turbo motor running a carb and I'm not 100% sure but don't the metro challenge series run carbs? They seem to go well enough,
Plus you'll have no restrictions to your build, you can have the best of the best to the highest standard,
and like Jamie said configuration shouldn't be a problem but I'd assume your running injection with a k head so I can see where the question came from definitely got me thinking...

Jack Jones

I think the Metro Challenge Cup clearly shows what 5 port turbos can do on the track, if you're still unsure as JF to take you for a spin round Combe in his Metty :)

Edited by Rob H on 7th Jun, 2011.

And look into the past there was the group a metro turbo's which were alleged to be around the 200nana mark.

If something is worth doing, it's worth doing half of.

and the cylinder head design makes a difference to that does it?

Yep, il do my best. As usuall ive too much on to finish the car.

It need a good weekend then were ready to roll. lol

Rick