My JB

Vulpes · Post by **Vulpes** » Wed Apr 20, 2011 3:46 pm

Man, I am impressed as hell with your work and love the attention to detail. As somebody else mentioned you are clearly a very clever bloke. I am pretty obsessive about the condition of my starion but you seem to take it all to a whole new level, well done !!!!!!!!!!!!

John196701 · Post by **John196701** » Wed Apr 20, 2011 4:32 pm

Thrash
Provided the tune is good, you should not blow the motor, you could easily blow a motor on 10 psi boost if the tune is not correct, 30 psi you just have to be more careful with the tune

thrash · Post by **thrash** » Wed Apr 20, 2011 4:38 pm

I know, i'm just having a dig at what Aaron said :)

incidentally, what afr have you found working best for your car on boost?

1320ft · Post by **1320ft** » Wed Apr 20, 2011 5:16 pm

thrash wrote:I know, i'm just having a dig at what Aaron said :)

Challenge accepted..... *insert barney stinson picture.

Now to find another staz....

OLD FART · Post by **OLD FART** » Wed Apr 20, 2011 5:48 pm

John196701 wrote:thrash
Yes, the bottom end is forged, shot and balanced, the top end is manley ss swirl polished valves and double valve spring with close to 1/2 valve lift and 290 duration cams, but low comp, only 6:1, HKS split pulse exhaust manifold, different to the factory split pulse, the turbo and the exhaust manifold was ex group team stock, a wideband O2 sensor and data logging helps the tuning

6.0-1 CR and add 24 PS1 boost and you get an 18.4 -1 effective CR

John196701 · Post by **John196701** » Wed Apr 20, 2011 6:07 pm

oldie
an engine at 6 to 1 CR at 1atm plus 2atm (30psi) of boost = 18 to 1, most engines run at a maximum efficiency of around 80% due to porting, cam overlap ect, this would bring the affective CR to 14.4 to 1.

OLD FART · Post by **OLD FART** » Wed Apr 20, 2011 7:33 pm

John196701 wrote:oldie
an engine at 6 to 1 CR at 1atm plus 2atm (30psi) of boost = 18 to 1, most engines run at a maximum efficiency of around 80% due to porting, cam overlap ect, this would bring the affective CR to 14.4 to 1.

I got that formula/info off a supercharger website so am not qualified to argue the toss with you :( :? :)

NXTIME · Post by **NXTIME** » Wed Apr 20, 2011 8:47 pm

I am very impressed with what you have done with your Starion, John. Definitely have done things differently to most and the fact that the car goes very hard is testament that there isn't anything wrong with the good ol' SOHC.

Will be interested to know the power and torque figures it make, and of course, what it can do down the 1/4 mile :D

Well done, mate.

John196701 · Post by **John196701** » Wed Apr 20, 2011 9:11 pm

Oldie
it has been a lot of years since i have done any of these calculations, before the internet, a lot of books, i found a website that basically follows what i had said, this may be useful to other people.

http://www.turbofast.com.au/TFcompB.html#readme

Engine VE: Engine Volumetric Efficiency in percent. VE changes with engine RPM, a engine at wide open throttle at 3000rpm could have a VE of 90% and at 6000rpm 60%. This is a rough guide. At maximum RPM modified engines may have a better VE, eg: average overhead valve engines 45% to 75%, overhead cam twin valve 65% to 80%, four valves per cylinder 75% to 90%.

this site you can enter all of your engine details and it will calculate the Boost CR

OLD FART · Post by **OLD FART** » Thu Apr 21, 2011 6:15 am

John I got my info from
http://www.jegs.com/s/tech-articles/sup ... itle=super everything you want to know about superchargers.Click on "tech articles and then on superchargers"

Post by **TOMSUN** » Thu Apr 21, 2011 10:00 am

Take it to the drags and we'll see where it sits on this list :D

http://forums.austarion.com/viewtopic.php?t=7030

John196701 · Post by **John196701** » Thu Apr 21, 2011 10:34 pm

Pete
First thing i will need to do is replace the clutch, just died tonight

John196701 · Post by **John196701** » Sun Apr 24, 2011 11:17 pm

I pull the gearbox out tonight, found the clutch plate has disintegrated

it brought back some memories, the flywheel had had about 6kg removed from it, i put back the old solid center clutch plate back in, the pressure plate in the car was a BMW M3 pressure plate, the bolt holes are the same as a Starion, the dowel pins need to be re-drilled, the standard Starion clutch has 1440 pound clamping force, the M3 standard has 1850, they change change the diaphragm in the and take the to 2400 pounds

the flywheel diameter has reduced down to the same as the pressure plate and the ring gear width has been reduced

the back of the flywheel has been machined out

while i had the gearbox, it gave me a chance to take a photo of the bottom of the exhaust manifold, this was a genuine HKS split pulse manifold

robert26t · Post by **robert26t** » Mon Apr 25, 2011 9:18 am

struth, nice work on that clutch!

John196701 · Post by **John196701** » Tue Apr 26, 2011 8:29 pm

Robert
I now know why i removed the solid centered clutch plate, the gearbox growls on over-run, off to order a sprung button plate this week.

Austarion

My JB

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