What to make the 3sgte compression ratio?

[vvega]

i would have thought with such a small cavity a custom front cover with a a35mm intake wouldnt have been such a silly ideawoudl liek to see some tests doign exactly that...i guess they probably alreay have though

[RedMist]

:lol:
with rallying, as you probably know, the driver plays such a huge part that 20hp can be overcome..... by some!
so......

and I'll let you think on why I'm trying to get every HP I can.

As you probably know. Most rally drivers drive to the limit, get a co driver and drive several steps over the limit, and then when pushed take a step or two further.
I've spent the last 17 years with no co dog, 1/2 the corners being blind, most with tricks to rip the suspension from the car, a fair percentage of time spent with far too little traction in a point and squirt car. I'm now building a car that will be expensive to repair and on a race when budget allows basis. It'll take me a while to get to trust the car and co dog, get used to the surface (far too much grip for my liking) and build a reasonable budget so that I can throw the car a little harder.

Have I missed any lame excuses?

However an engine is a sum of its components. You never throw away 20 cheap HP in favour of attempting to gain it back somewhere else. The restrictor and the consequential effects on the configuration of engine components is what determines which cars have the potential to run at the front and which at the rear. I'll debate this for days, suck everyone's opinions, flow test every reasonable theroy, if it could possibly gain me a 20hp.
I know the car is heavy, I know the engine is reasonably capable, I know the drive train is strong. I know I'm a reasonable, very clinical, agressvie, sometimes a little conservitive driver. I'm not flucking around here, I either have to have the potential to run at the front (pre 96, with a couple of years development) Or I'll go do something else.

Anyone for Bar Stool racing. I have a nice strong 3sgte that would be wonderful in one.

you the next possum?

By that you mean dead? Not yet, but there is always hope.

[Mr Revhead]

yep, fair enough......

dont forget to save for some good tyres....
tyres are the single most important thing.

[RedMist]

No, what I'm saying in the you need to bellmouth the entry and exit if the exit taper is greater than 8°.

I see if I can find time to take some measurements from the CT20B and draw it up.

Would be most appreciated. All I can amagine at the moment is a bellmouth blending into a greater than 8 degree taper. Or are you stating increase the radius on the bellmouth until the ramp is below 8 degrees?

Just need a very basic pic. No need for measurements. I'll have to mock it, flow it and run it here anyway.

[fivebob]

Oops I just checked the data and the optimal angle for laminar flow is 7°

Anyway I just did some calculations and it's not going to be an issue. A 7° taper over 50mm from the 36mm throat will almost exactly match the CT20B inducer size of 48mm (it's about .25mm over).

[soopachargen]

i was talking to my tutor today (ex ralliart) and he said that the design of the restrictor that they were using was a bellmouth and then its just tuned to the revs you want it work at and whether you wanna make torque or horsepower etc... he also showed me how the illegal toyota ones worked but im guessing you dont wanna go illegal and you can probably find them on the net anyway.

[Mr Revhead]

and those ones wont be cheap to replicate!

im assuming this guy is ralliart nz

[soopachargen]

nah, ralliart europe by way of ralliart australia, has since worked for suzuki

[vvega]

we have a cheating one at work as well

[soopachargen]

thats two votes for cheating... anyone else?