percentage increase in torque - SC

[Chilliman]

OK, the basis of power increase with forced induction is loosely double the pressure double the power, so 1 bar of boost (used to be atmospheres in my day) will double the bhp (twice atmospheric pressure). Although of course things are never that simple and there's lots of other other things to take into account so there's losses to contend with. (I know this is simplification at its best but simple is what I'm trying to be).

So typically, when a SC is fitted, and assuming no other modifications undertaken when it is, can we expect the percentage torque increase to be in line with the percentage power increase or, (as I seem to suspect but I don't know why) the torque gains are greater in percentage terms than the power gains. Oh, and if it makes any difference it's a 10.5:1 CR and a fairly lairy cam (somewhere between a Stealth and a 404)

I hope that makes sense to someone

[Alun Ivor]

Nope, but I like the sound of it, ha ha ha.

[Alun Ivor]

Actually, I'm not sure but that sounds on the money to me, and I've observed the same kind of stats to back that suggestion up, turbo, the torque figure is the one that stands out! And do we love torque or what, ha ha ha.

[Hoofa]

Nope not a clue, however throttle push equals a warm feeling in your pants, which after all is the result of the for mentioned mods

[neal1980]

Hoofa said:

Nope not a clue, however throttle push equals a warm feeling in your pants, which after all is the result of the for mentioned mods

So come on then whats yours pushing out you have been very quiet!

[Hoofa]

I think we should have a dyno day where the big boys meet, that said I think I will be to yours , hope fully the hog roast grill will be still be in place , just shoving a new clutch into mine at the mo

[Dr Mike Oxgreen]

Hoofa said:

throttle push equals a warm feeling in your pants

I thought it was only Griff drivers who suffer that kind of incontinence.

[neal1980]

Hoofa said:

I think we should have a dyno day where the big boys meet, that said I think I will be to yours , hope fully the hog roast grill will be still be in place , just shoving a new clutch into mine at the mo

I will be up for that almost stripped my new engine down now for machining, gotta get a move on with it

Hog roast is being glassed back in sorry...

What clutch you going for twin plate??

[slideways]

neal1980 said:

Hoofa said:

I think we should have a dyno day where the big boys meet, that said I think I will be to yours , hope fully the hog roast grill will be still be in place , just shoving a new clutch into mine at the mo

I will be up for that almost stripped my new engine down now for machining, gotta get a move on with it

Hog roast is being glassed back in sorry...

What clutch you going for twin plate??

Neal did you get over your overheating issues then? Or are you not putting turbos on the new build?

[neal1980]

slideways said:

Neal did you get over your overheating issues then? Or are you not putting turbos on the new build?

It did run hotter when I had the smaller rad in there, put back to standard wih the uprated spal fans and all fine. New build will have turbos but im having a different rad again...I want it to look standard on the outside

[slideways]

neal1980 said:

slideways said:

Neal did you get over your overheating issues then? Or are you not putting turbos on the new build?

It did run hotter when I had the smaller rad in there, put back to standard wih the uprated spal fans and all fine. New build will have turbos but im having a different rad again...I want it to look standard on the outside

I must admit I really didn't want to have to cut my bonnet, just as Well mine stays nice and cool now

[Hoofa]

neal1980 said:

Hoofa said:

I think we should have a dyno day where the big boys meet, that said I think I will be to yours , hope fully the hog roast grill will be still be in place , just shoving a new clutch into mine at the mo

I will be up for that almost stripped my new engine down now for machining, gotta get a move on with it

Hog roast is being glassed back in sorry...

What clutch you going for twin plate??

Going same as slide ways , very impressed how light it feels, I have the rather heavy helix that juddered on take up so time it hits the bin

[v8 racing]

Chilliman said:

OK, the basis of power increase with forced induction is loosely double the pressure double the power, so 1 bar of boost (used to be atmospheres in my day) will double the bhp (twice atmospheric pressure). Although of course things are never that simple and there's lots of other other things to take into account so there's losses to contend with. (I know this is simplification at its best but simple is what I'm trying to be).

So typically, when a SC is fitted, and assuming no other modifications undertaken when it is, can we expect the percentage torque increase to be in line with the percentage power increase or, (as I seem to suspect but I don't know why) the torque gains are greater in percentage terms than the power gains. Oh, and if it makes any difference it's a 10.5:1 CR and a fairly lairy cam (somewhere between a Stealth and a 404)

I hope that makes sense to someone

Hi rich, yes it does make sense, however you will allways gain a higher percentage in torque than bhp, the reason for this is the cylinder has more time to fill the lower the rpm, also as the revs rise you get more and more pumping losses, (exhaust gasses trying to get out)

[Chilliman]

Thanks Rob, can't wait to get this under way

R.

[v8 racing]

Chilliman said:

Thanks Rob, can't wait to get this under way

R.

No worries however i am going to nick your car for a day to see what it does down the strip!!

[Chilliman]

Er, righto....

[GasMunkey]

I wonder how many 450+ bhp Chims will be running by the end of 2013?

[v8 racing]

well its about time i had one!