970cc K-Head Turbo Racer
Turbo Mini Forums

I think so too. Think of it like this the 17 will make an easy 200bhp on a 2.0l engine at say 5 or 6 k. If you want to run at 10k then it will be operating in a similar region of the map.

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

The bid advantage of the gt17 is his highflow turbine, the lack of corresponding compressor map is still a bit confusing,
anyway last gt comp wheel are very efficients, and a 52/38mm will have enough breath for 200 bhp .
I think Rob and wil engines prove this is a very good one.

ps: the gt17 thread should only be read tangentialy:
It is mainly a discution about the amount of power possibly produced by our beloved pushrod a-series. whatever said/argued in this are just words which just cannot be approved,just words,
the only judge is: chrono and that is someting we know:
Rob and Wil machines are certainliy scaring when it's Grenn light.

So whats the theoretical max power the GT17 will flow?

Chris

We don't know ,
just imagine something between 2052 52 trim and 2252 60 trim, but all is fogguy around his flow capacity,
One fact is:
saab switched from the gt1752 used on lpt 150 and 180 bhp to a td04 for the aero 210 hp model, certainly for one reason, and they have the maps.

The only map i plotted that is known and correspond to your flow/pressure is the rs4 turbocharger k04 025, don't de messed by the lightly lower efficiency as it is a trade between wheel size and flow, and this one will rev happily, lessening the boost effect

Ok cool... I got my block today so tomorrow I can start playing!

Think im going to block it up for the 16v then do the undercrown jets first.

Ive ordered the oversize K-head valves form the states. They should be here in 3 weeks. (Better than the UK where the quickest lead time I could get was 14 weeks!) Quite expensive at £29 per valve!

Ive also sent the cams off to be measured and a new design come up with for the cam adapters. I'm having them made in billet with the cam adapter already built in so the pulleys just slide straight on :)

Just trying to decide on Pistons. MED 16v Cast Omega's, forged Omega's then do the cut-outs myself or Cosworth?

Chris

why not sleeve your bloc and use bimmer pistons?

? what size are they?

70.5 diameter
18mm pin
24mm deck height

weight: 260g with rings and pin

Suitable for turbo? Probs not?

they do look strong and are made by mahle

Think i'm going to stick to omega's I think.

Concentrate all my effort and budget elsewhere.

Chris

Ok.. got my BMW oil jets. Will do that tonight.

What compression do you lot recommend?

Chris

what's the cam profile, or rather what degrees does the inlet cam close...

Cams ar going to be custom, they have the origionals right now, measuring them up and then ive got to work with them to sort a profile that will work

I rekon 8.5?

Might be able to run higher, depends on what fuel your going to use as well as boost

Drives
-Ford S-max Mk2 Ecoboost
-Rover 100 VVC #2 - track project

Searching is all you need on TurboMinis

Have a read of this:

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=359932

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Read that.. I think im going to be running more boost that that? I'm not sure.

Fuel is determinded by the rules as "pump fuel" so i'm guessing the best I can get is 102 octane.

Off boost drivability doesnt really make much difference to me, i'm not going to be off boost during the run.

So if I go with 8.5 I could run boost up to 20psi?

Intercooler wise I'm thinking front mounted with a CO2 spray. Just dump a load of Co2 on the start line to supercool the IC. Then the runs only take 60-70 seconds at most so hopefully the heatsink capabilitys of the IC that cold should mean my IC is pretty efficent?

Correct if I'm talkin bollocks?

Chris

8.5:1 is pretty usual for an 5 port iron head with a phase 2 cam or smilar,

the trouble is you are changing nearly all the characteristics of the engine,different bore & stroke, Different chamber shape, different flow charachteristics, different cams, different head material, different rev range ect....

what i was alluding to is your cams and the change in bore, stroke and rod length are going to affect the dynamic CR significantly, first thing i would do is work out the dynaminc cr on a typical turbo A series then work it out for yours.

http://www.rbracing-rsr.com/comprAdvBMW.htm

I assume that you are going to end up with cams getting on for around 280 deg, if so I'm GUESSING 9.5:1 static is going to be closer to what you need

What dynamic CR should I be aiming for?

Chris

mine is about 6.6:1

http://www.not2fast.com/turbo/compression/compression.shtml

Mine comes out at 8.23:1

Hows that?

Have you ever competed in a hillclimb or sprint?

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

Yer a couple of seasons.. why?