Cosworth Supercharger Owners Thread

[ajc209]

Originally Posted by JerryIII

Same boat here lowered the compression 10:1 forged internals ect. And also had Sharif tune mine would also like to get more power then .1 bar but is is a start

Presumably your losing some power on the lower compression with just the stage 2 pulley too.

if you have injectors and fuel pump to suit i'd get a new crank pulley engineered to boost it to 350hp and call it a day.

Obviously its untested territory though.....

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[Matt@Cosworth]

Originally Posted by weederr33

Woah, that's interesting. Essentially instead of a smaller SC pulley, we'd upgrade the crank pulley? So with the 10% smaller pulley, would larger injectors and and upgraded fuel pump be required?

my current plan is to go smaller on the SC pulley by 10% in addition to replacing the crank pulley with something about 5-7% larger which will roughly make a 3:1 ratio on the SC to crank
the slight increase in crank pulley should mean no need to change the other drives


and with just the 10% pulley on its own there's no need to uprate the injectors or fuel pump or change the tune although it probably can't go much further

[weederr33]

Originally Posted by ajc209

Presumably your losing some power on the lower compression with just the stage 2 pulley too.

if you have injectors and fuel pump to suit i'd get a new crank pulley engineered to boost it to 350hp and call it a day.

Obviously its untested territory though.....

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I feel as though 320-330 would be the perfect medium for this car. Any more power and it would be a bit silly.

[ajc209]

Originally Posted by Matt@Cosworth

my current plan is to go smaller on the SC pulley by 10% in addition to replacing the crank pulley with something about 5-7% larger which will roughly make a 3:1 ratio on the SC to crank
the slight increase in crank pulley should mean no need to change the other drives


and with just the 10% pulley on its own there's no need to uprate the injectors or fuel pump or change the tune although it probably can't go much further

So thats spinning the sc at about 22k rpm. Thats about 290 ish whp?

I think alot of people will be tempted to run that on stock internals.

Do you have any idea how long the stock rods would last at that power or is it a case of how long is a piece of string.





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[Matt@Cosworth]

Originally Posted by ajc209

So thats spinning the sc at about 22k rpm. Thats about 290 ish whp?

I think alot of people will be tempted to run that on stock internals.

Do you have any idea how long the stock rods would last at that power or is it a case of how long is a piece of string.





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the trouble with the stock sintered rod is they are a complete lottery, they are essentially a big mass of cracks just waiting to happen and the extra load can push them into the dangerous part of the SN (fatigue life) curve so they could last 10,000 more cycles or 1000,0000 more cycles
unlike a proper material you cannot predict the fatigue point with any great accuracy
which is why we settled on the cylinder pressure figure we did

[Matt@Cosworth]

Originally Posted by weederr33

I feel as though 320-330 would be the perfect medium for this car. Any more power and it would be a bit silly.

I'd agree with that as after this point you're into breaking drive-shafts, transmissions etc

well I say that now,
whats the saying ; power corrupts ? and absolute power corrupts absolutely


I remember when I had my TVR Cerbera ( 350Bhp) that seemed very rapid for about 3 weeks and you then get used to it and start feeling ' I could do with a bit more'.......

[weederr33]

Originally Posted by Matt@Cosworth

I'd agree with that as after this point you're into breaking drive-shafts, transmissions etc

well I say that now,
whats the saying ; power corrupts ? and absolute power corrupts absolutely


I remember when I had my TVR Cerbera ( 350Bhp) that seemed very rapid for about 3 weeks and you then get used to it and start feeling ' I could do with a bit more'.......

Haha! That is very true. Of course, I'm pretty comfortable with the 280 right now. It is a happy medium for me.

[ajc209]

At least with the sc its quicker than the average diesel exec.

I have to admit, 330hp seems a bit low if im going to the effort and expense of adding uprated internals though.

No hope of a pulley kit offering the full power the sc is capable of?


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[CSG Mike]

Originally Posted by Matt@Cosworth

my current plan is to go smaller on the SC pulley by 10% in addition to replacing the crank pulley with something about 5-7% larger which will roughly make a 3:1 ratio on the SC to crank
the slight increase in crank pulley should mean no need to change the other drives


and with just the 10% pulley on its own there's no need to uprate the injectors or fuel pump or change the tune although it probably can't go much further

There's a little knob cast in the block that's in the way... are you shaving it off?

[ajc209]

Happy New Year Folks! I'm sure ill be too drunk to post in 2 hours time..

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[weederr33]

Originally Posted by ajc209

At least with the sc its quicker than the average diesel exec.

I have to admit, 330hp seems a bit low if im going to the effort and expense of adding uprated internals though.

No hope of a pulley kit offering the full power the sc is capable of?


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It may seem a bit lack luster, but for me, the internals would just help the longevity. But still give you the opportunity to upgrade as needed. Maybe twincharge the engine? haha

[muckypuppy]

I would also be interested in the smaller pulley, but ideally would want the internals as well for peace of mind.

[Matt@Cosworth]

Originally Posted by CSG Mike

There's a little knob cast in the block that's in the way... are you shaving it off?

thanks for the heads up, I'll check if its removal is required

[Adam (NoVA)]

Originally Posted by Matt@Cosworth

I'd agree with that as after this point you're into breaking drive-shafts, transmissions etc

well I say that now,
whats the saying ; power corrupts ? and absolute power corrupts absolutely


I remember when I had my TVR Cerbera ( 350Bhp) that seemed very rapid for about 3 weeks and you then get used to it and start feeling ' I could do with a bit more'.......

That's why we often refer to boost as the dark side