1971ccm Street-Turbo-Typ4 need some ideas

[Typ4-Boy]

Hey,

i`m from germany and just build non-charged engines, but now, i want to go new way for my own.
So i want my first turbocharged engine. The last 3week, i read the "turbomania" and learn a lot about this topic.

At this time, i build an 1200-stock-engine with an garrett gt15, just to learn, it will be a test-engine...

now my idea for my daily-race in the city
It will be a typ4-engine with
-stock crankshaft and pistons/connection-rod
-1,7l Heads with 42/35,5 valves ant optimised ports
-double-valvesprings on the intakes
-singel harder springs on the outtakes
-56g TP-lifters

And now, i`m not sure:
-8.2:1 compression?

and this parts i don`t know
-turbocharger? garrett gt25?
-camshaft? i like pauter-cams

For the fuel-injektion, i`ve 2 double 42mm trottlesbodys with injektors

I want from the engine a lot of power but driveable,
from ~1700rpm to ~6500rpm must the engine be unbeliveable

I hope someone understand my word and can help
Best greetings von germany

[Peter]

hello,
i wish i could tell you, but dont have much experience myself..
I am building a turbo motor myself now, but i want it to turn more revs..
you have got to find the maps from the turbo and ask yourself how much power you want
i found some good info on squirrel performance; they have a calculator based on engine size etc to give you an idea what turbo to take..
hope it helps a bit

[Torben Alstrup]

Definitely keep dual springs on both valves. - Especially if you use Pauter cams.

Depending on how high up you want max power, I would choose a Web 119 turbo or a 163 turbo. The latter can aid in the supply of over 300 hp out of a 2 liter if you make the combo right.
CR. depends on how much you want to boost. - Say the 163 cam and 1 bar, 8,2 - 1 will be fine. If your chambers are perfect even 8,5 is possible. same cam/engine with 1,5 bar boost, and 8 - 1 is more like it. If you wanna pump 2 bar on it you need to reduce the CR to about 7,7 I think. (Havent made the math)

Also, chose real 36 mm exh. valves instead of those cheapo 35,5 mm. Both valves and seats live longer.

T

[volkskris]

talk to Armin Klein
http://www.turboboxer.de/

[Typ4-Boy]

Hey,

thanks a lot, this are good informations. the next days i will read everything about turbomaps
Then i can choose the turbo!
And then i ask for the cam *g*

But i don`t know why doublesprings on the exhaust-valves?
Oh and i just want mendley valves, but you get mandleys just in 35,5 or 37,5

Greeting

[Torben Alstrup]

Yes I know. Step up and take either DelWest or Racemaster valves instead.
You do NOT want a floating exhaust valve in high rpm. The risk is not hitting a piston, but getting fuel mix out in the header under boost. Resulting in overheating the turbo hence failiure as a result.
T

[Typ4-Boy]

Okey, now the engine ist almost ready, the compression ratio will be 8:1, the turbocharger will be a garret GT2871r with 71mm, 48trim, 0,60A/R. The cam will be a pauter turbo-grind.

Now the last thing witch makes me sure... how much boost pressure is good for daily driving? The Power i want from my engine is just at ~30psi! Its a lot, or?
Greeting