Cosworth Supercharger Owners Thread

[weederr33]

Originally Posted by Drewskie

To those of you guys that have this kit installed is like to know if there is noise from the supercharger that you can hear inside the car. The whine to be more specific. Is it loud or not there at all.

Thanks

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It's hardly there, but you can hear a very subtle noise. Just depends on your exhaust.

[Matt@Cosworth]

If you go for an aftermarket intake box then you will hear more whine
bear in mind that this is a modern eaton unit and noise is wasted energy
so less whine means more efficency

[Drewskie]

Originally Posted by Matt@Cosworth

If you go for an aftermarket intake box then you will hear more whine
bear in mind that this is a modern eaton unit and noise is wasted energy
so less whine means more efficency

What's the difference between the Cosworth unit and the Sprintex or Edelbrock.

Thanks for the replies folks this helps a lot.

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[weederr33]

Originally Posted by Drewskie

What's the difference between the Cosworth unit and the Sprintex or Edelbrock.

Thanks for the replies folks this helps a lot.

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I believe the Cosworth is a TVS 900 while the Edelbrock is a TVS 1320 unit. But... I'll let Matt answer that one haha

[Drewskie]

You guys are awesome thanks for answering all my questions.

OK so a quick question that has probably been answered but I'd like to hear what you guys say. What is the maximum amount of power one can get out of a fa20 with this kit before hitting diminishing returns? I guess this is more directed at Matt

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[weederr33]

Originally Posted by Drewskie

You guys are awesome thanks for answering all my questions.

OK so a quick question that has probably been answered but I'd like to hear what you guys say. What is the maximum amount of power one can get out of a fa20 with this kit before hitting diminishing returns? I guess this is more directed at Matt

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Matt talked about it briefly (he's very secretive lol) a few pages back. Basically Cosworth determined that 280-290 hp (at the crank) is the recommended output for a stock engine. BUT, if you've read any other threads in the FI section, you will quickly find out that that is not always the case. Some people can go much higher than that, while others blow the motor on a CARB-tuned engine. Of course, Cosworth has done a megaton of research so that's why I feel pretty confident with them.

The supercharger itself is good for about 380 hp. But that would require a built motor and a specialized pulley set which Cosworth will hopefully release.

[Drewskie]

Honestly the thing that is selling me is the charge coolers on each bank. It just seems like a much better design than others. I'm probably going to get this kit as I would feel most confidant driving it. I just wish it was a bit cheaper. But I do understand where a lot of the cost goes so c'est la vie.

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[Matt@Cosworth]

Originally Posted by weederr33

Matt talked about it briefly (he's very secretive lol) a few pages back. Basically Cosworth determined that 280-290 hp (at the crank) is the recommended output for a stock engine. BUT, if you've read any other threads in the FI section, you will quickly find out that that is not always the case. Some people can go much higher than that, while others blow the motor on a CARB-tuned engine. Of course, Cosworth has done a megaton of research so that's why I feel pretty confident with them.

The supercharger itself is good for about 380 hp. But that would require a built motor and a specialized pulley set which Cosworth will hopefully release.

as weederr33 says really
the main issue is that the stock rod being sintered is a bit of a lottery
some folks may go bang - some may not all depending on how far you're pushing it
our stress analysis on the parts showed a certain cylinder pressure level was safe so we developed our tune with cylinder pressure measurement to even up all the cylinders and then dialed in the minimum of boost required to achieve this pressure level with optimised cam timing spark, fuel etc

now if you want to push on with the stock rods then you can of course just press on and machine up a smaller SC nose pulley you can go about 10% smaller before you run out of room and this gives another 0.1bar boost pressure and our tune will just about accommodate this

more than this will need a larger crank pulley to get the ratio you need and ideally you'd resize all the other pulleys too so you don't overspeed the water pump for example
now I'm experimenting with a small increase on the crank pulley to avoid changing everything else and this should result in about 0.9bar of boost and 330-340Bhp
obviously we're into a custom tune here and the need to go SD instead of MAF and possible consider a aftermarket airbox at this point too
it would also need larger injectors / fuel pump / better clutch etc

[ajc209]

Originally Posted by weederr33

I believe the Cosworth is a TVS 900 while the Edelbrock is a TVS 1320 unit. But... I'll let Matt answer that one haha

it worth pointing out that the bigger blower necessarily better. These roots charger are not like turbos, they displace air to make boost and usually they have a engine capacity range they are designed to work with for the best efficiency.

As far as my limited knowledge can tell, both the 900 and 1320 are capable of running the maximum 2.4bar pressure ratio before getting to max speed. So there isnt a huge difference in max power between the kits as people will have you to believe.

Originally Posted by Drewskie

Honestly the thing that is selling me is the charge coolers on each bank. It just seems like a much better design than others. I'm probably going to get this kit as I would feel most confidant driving it. I just wish it was a bit cheaper. But I do understand where a lot of the cost goes so c'est la vie.

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Same reason I went wit this kit. I was at the track event this weekend and got to see the Harrop SC kit fitted up close next to my cossy. Its a nice bit of kit and fits snuggly in the engine bay. Its notably smaller and lower, so much so that a strut brace might fit.

regarding IATs roughly over ambient:

Cosworth +15C
Edlebrock +30-35C
Harrop +25-30C

[Matt@Cosworth]

thanks for the info Ade

also to answer weederr33 yes our unit is a R900 which displaces 0.9 ltrs every rev whereas a R1320 displaces 1.32 ltrs every rev
BUT
both have the same pressure ratio so the maximum boost that either can make is 1.4bar over atmospheric
the R1320 will reach maximum boost quicker than a R900 but you can compensate by spinning the R900 faster and the larger blower will also consume more power to produce the same level of boost
when we did our initial analysis we concluded the r900 is the right size for a 2 ltr engine

[weederr33]

Originally Posted by Matt@Cosworth

thanks for the info Ade

also to answer weederr33 yes our unit is a R900 which displaces 0.9 ltrs every rev whereas a R1320 displaces 1.32 ltrs every rev
BUT
both have the same pressure ratio so the maximum boost that either can make is 1.4bar over atmospheric
the R1320 will reach maximum boost quicker than a R900 but you can compensate by spinning the R900 faster and the larger blower will also consume more power to produce the same level of boost
when we did our initial analysis we concluded the r900 is the right size for a 2 ltr engine

Thank you for the explanation, I would not have known the difference.

[ajc209]

Originally Posted by Matt@Cosworth

thanks for the info Ade

also to answer weederr33 yes our unit is a R900 which displaces 0.9 ltrs every rev whereas a R1320 displaces 1.32 ltrs every rev
BUT
both have the same pressure ratio so the maximum boost that either can make is 1.4bar over atmospheric
the R1320 will reach maximum boost quicker than a R900 but you can compensate by spinning the R900 faster and the larger blower will also consume more power to produce the same level of boost
when we did our initial analysis we concluded the r900 is the right size for a 2 ltr engine

Yes that's how I understood it. So the harrop car runs a pressure ratio of 2.2 to achieve about 320whp and with a 65mm pulley which is roughly 12k rpms - same as our stock pulley.

They cant spin it much faster as the max pressure ratio of the TVS units is 2.4 (1.4Bar boost).

With the R900 in the cosworth you just need to spin it at 17500 rpm to match that.

How fast can the R900 spin? Looks like much past 20k the efficiency starts falling off but that should be enough to get the max 2.4 pressure ratio?

[Matt@Cosworth]

agreed the max continuous rpm for the R900 is 20,000rpm as specified by Eaton

however at Cosworth we've run this unit quit a lot faster than this without any issues

28,000 rpm anyone......
obviously you' well off the efficency zone here but sometimes needs must

[weederr33]

Originally Posted by Matt@Cosworth

agreed the max continuous rpm for the R900 is 20,000rpm as specified by Eaton

however at Cosworth we've run this unit quit a lot faster than this without any issues

28,000 rpm anyone......
obviously you' well off the efficency zone here but sometimes needs must

But the real question is, what if you took the Cosworth supercharger, spun it up to say 25,000 rpm, and then added a turbo kit for a nice twin-charged unit?!