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jufferb

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stourport-on-severn, worcestershire

22nd Nov, 2005 at 05:15:19pm

hi all,
im stripping down my turbo engine to put my new bits on at long last. im fairly new to the turbo scene s-o sorry to be a pain with the boring questions. I have a few questions to ask that you turbo nutters will hopefully have the answers for.

1) i dont know which cam to use. most people use the phase two turbo cam from avonbar but i was wondering what the sw5 cam would be like.What would you recomend?

2) what is a sensible boost to run for fast road and track use without putting strain on the engine.

3)What sort of bhp am i looking to get out of my spec with the boost and cam you recomend you recomend.

engine spec:

mirage manafold
renault 5 t2 turbo
ported and gasflowed head
1.5:1 rockers
doulble valve springs
lightened fly wheel
grp A head gasket
ford rs intercooler
4 pin diff
k&n
powerflow large bore single box system


thanks

If in Doubt, go flat out !!!

Tom Fenton
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Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner

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Rotherham South Yorkshire

22nd Nov, 2005 at 05:40:30pm

The phase 2 is the way to go. The SW5 is a great cam for use in NA engines, but the phase 2 has extended exhaust duration tailored to the turbo setup.

The glaring omission to me is what pistons do you intend to run? In addition, the main mod you need to do to the cyl head is to increase the chamber size to lower the compression ratio.
Group A head gasket it turns out is not really required. I say "turns out" as before I found this forum, I had my engine modified to accept the group A gasket. I think I have the only engine I know of that uses this gasket?


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Turbo Phil

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Lake District

22nd Nov, 2005 at 05:53:40pm

On 22/11/2005 17:40:30 Tom Fenton said:
I think I have the only engine I know of that uses this gasket?


You're not alone Tom i also used this "overpriced" gasket. lol.

Like Tom i also reccomend the P2 cam, as do many others. Great for a fast road motor, and also doesn't sem to be much of a limiting factor where big power is sought.

I'm guessing your wanting something fairly road driveable, but with a decent bit of go when required ?
Drop the compression to about 8.5-1 use the Minispares Mega pistons and run 10-12psi. {standard pistons will do the job at this boost, but i doubt you'll be lucky enough to find a standard engine which isn't in need of a rebore} Providing the engine and transmission is well built and properly set up, you should have many miles of happy motoring.

Phil. *smiley*

WWW.TURBO-MINI.COM


turbodave16v
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SouthPark, Colorado

22nd Nov, 2005 at 06:06:15pm

Good answers!

Welcome to the #1 site for turbocharged minis!

Dave

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BENROSS

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Resident Cylinder Head Modifier

Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem

22nd Nov, 2005 at 09:43:01pm

the phase 2 is excellent to say the least

its got great road manners & produces the goods!

my advice is ditch the 1.5 rockers and stick with 1.3s with the phase 2

oh! place on your list the Avonbar supaflow oil pump is the one to use

the minispares one is made of wood & wears out easily!

Edited by BENROSS on 22nd Nov, 2005.






mini300bhp

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Cambs

23rd Nov, 2005 at 11:13:45pm

me got the gasket too.

Its only a bit of metal. If it blows it blows!

http://www.putfile.com/mini300bhp


Richie

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a LIL fishing village on the coast - Newcastle Upon Tyne

23rd Nov, 2005 at 11:39:02pm

yeh i spoke to avonbar when i baught my phase 2 they recomend 1:3 ratio rockers (just to corroborate what Ben has already said mate) the cam costs about 70 quid ish posted and is a work of art !



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wethepeople

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Felixstowe, Suffolk

23rd Nov, 2005 at 11:51:02pm

yeah i hear if you run the 1:3 rockers over the 1:5, you are likely to gain at the bottom end, without sacrificing much if anything at all at the top end, but then you could always try both and see what works best for your set up? :)

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