How bigs to big?
Turbo Mini Forums

Hi,

I have a 1098cc thats been bored 80thou. Is this to big to turbo or supercharge? Also what kind of compression would i be aiming for?

Thanks Blake

Not too big at all. Depending on use and poer wanted, somewhere between 8.5 and 9:1 is what I'd aim for.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

I'm turboing a +0.060" 1098. 24.5cc chambers, 7cc dished hypatecs and a CR of 9.2:1 iirc

On 12th Nov, 2009 Paul S said:

I think Gary OS has taken over my role as the forum smart arse

Thanks, its being used for everyday use but a majority of my driving is on back roads doing 50 odd mphs 90% of the time. I wasnt looking for huge power but i like the idea of having abit of power on tap if i needed it.
I was only looking at running about 6psi. Would it be worth doing it with only 6psi?


Thanks Blake

Definately! Take a look at Wil's "How To Turbo A Mini In 20 Hours". I think that runs at 6psi on a 998 and its a TM legend

On 12th Nov, 2009 Paul S said:

I think Gary OS has taken over my role as the forum smart arse

Yeh ive had a look at that quite a few times now. The main thing was, i was concerned about the cylinder walls being to thin.


Blake

No need to worry. There are up to +0.120" 998 pistons available and being used on twin cam builds. 998 blocks are the same as 1098s. If there are reliable 1380 turbos then I wouldn't worry about wall thickness on a small bore

On 12th Nov, 2009 Paul S said:

I think Gary OS has taken over my role as the forum smart arse

Well now i know that i better start sourcing some parts.

I have a TD04-09 in the garage, will this be to big for what im looking at?

TD04 is used for the higher power Saabs over the GT1752 so it's probably way too big. What are the trim and A/R figures? Have you got a compressor map for it?

On 12th Nov, 2009 Paul S said:

I think Gary OS has taken over my role as the forum smart arse

Yeh this one is off a Mitsubishi Delica. I dont have any info. other than that for it as i picked it up from a mates wreckers for nothing. It hasnt got any play and seems to be in really good condition so i thought id take it.

BUt if its to big i might try and swap it for a smaller turbo then. The T02 is what i should be looking for isnt it?


Thanks Blake