RenegadeWRX

You are very close it seems the SC46 is a twin scroll turbo rated at 47 lbs per min and a 470 bhp rating. spools about 500 rpms sooner

I'm running a single scroll of that turbo rated at 49 lbs per min and 480 bhp.

huge difference I know

For some reason a lot of the charts I've seen on the single scroll have been pushing supposedly 450 wheel horse power which is way beyond the 480 bhp rating.

http://www.bptstore.com/Subaru-WRXST...ger_p_130.html

http://forums.nasioc.com/forums/show...6#post36181323

http://www.bptstore.com/Subaru-WRXST...rger_p_25.html

http://shop.scoobyclinic.com/index.p...product_id=133

chopperman

I know what you mean mate. Here in the uk where stuck between imperial and metric. We buy petrol ny the litre but then try and work out our mpg (miles per gallon) Like the america we use HP, BHP ect but there is no official standard to this measurement. Because of this most other country's either use PS or KW.

chopperman

Yeah and its this type of reports that had me asking the questions ive been asking.

banny sti

iTrader: (68)

General rule of thumb American whp is equal to our fwhp

chopperman

That's the conclusion i came to mate

RenegadeWRX

alright now what's with this Fwhp?

Now I'm getting really confused a lot of math is involved and I'm tired. I think I'll go to sleep and check back tomorrow sometime and see if I can wrap my stupid American brain around this.

I feel like I fell into a Time Warp or another universe or something. I'm sure I'll get it eventually once my car gets here and I take it to a local tuning shop and throw it on their dyno.

chopperman

fly wheel horse power mate.

and for the record i like Americans no so much the gun toting Republican's tho Visited your country many times and loved it. Mainly cali.

RenegadeWRX

The other thing I don't get is that how can a turbo be rated for xxx number of horse power before adding into effect the fuel being used, the altitude, the amount of air flow through the intake (3";2.4";air box;cone filter;etc;etc), the compression ratio, so on and so forth til every last part on the car has been fully upgraded to the max.

How does the turbo have that kind of restriction on it?

RenegadeWRX

How is flywheel horse power different from brake horse power?

chopperman

I think its worked out as a potential target at sea level with no bad restrictions such as small airbox, crap fuel ect. How much air with the ideal fuel mix can be pushed into the cylinders of a certain cc should give enough info to work out a realistic power target.

chopperman

Well it pretty much the same thing but as i said there is no real official standard. In the factory they will test the power on the end on the crank using a crank brake. They will up the revs in say 500rmp increments while applying a measured amount of resistance with the crank brake. This works out the BHP or Brake horse power.
On a dyno they will power the car in a selected gear up to the redline and measure the power, then let the car over run on the rollers and this will measure the transmission resistance. This figure then deducted from the first figure should give the approx FWHP. That's how i understand it anyway. If i'm wrong i'm sure we will both be educated shortly

Tidgy

US results tend to be higher than whast seen in the UK. make of that what you will.

Infected by sti

iTrader: (6)

They obviously know something or are doing something we don't

Tidgy

different laws of phyisics in the new world,,,,, lol

RenegadeWRX

I'm hoping to get my car up on a dyno when it gets here and see exactly what kind of numbers it puts down at a lower altitude and whatever rating they read here in Germany.

chopperman

I think they use PS in europe which is a similar number to bhp. 320ps = 316 bhp. Not sure if the dyno places use ps,bhp or kw. Maybe they can give you the graph in whatever unit you want?

Infected by sti

iTrader: (6)

Just demand a proper one

RenegadeWRX

This thread got way off topic, sorry for this but I got rather educated.

chopperman

I wouldn't worry about it, i think the op got his question answered. May just as well let this thread evolve than start a new one. Save on paper

RenegadeWRX

johnfelstead

540lbft on my TMIC No water or meth injection used, just plain air.

mantazini

iTrader: (25)

Most of us know what you got John , so not really a comparison...

Maz

iTrader: (34)

Imagine that same intercooler mounted in the right place.

MattyB1983

iTrader: (51)

Was thinking the very same thing.....

Maz

iTrader: (34)

Much as John may extol the virtues of his TMIC even he can't change the laws of physics.

MattyB1983

iTrader: (51)

Careful, you'll upset him and he'll start posting all his log sheets, graphs and pie charts that he's accumulated. .......

RenegadeWRX

lol