Rotary Car Club - View Single Post - 13B Power @ 1 bar absolute pressure, to see what you might have if you MAN UP!

RICE RACING · 02-01-2014, 11:55 PM

[QUOTE=Barry Bordes;274121]Hey Peter,

We are having a Global Warming snow storm in New Orleans. Go figure.
Everything is shut down so I thought I would contribute.

Probably apples and oranges as far as taking data compared to your system.
Mine from the TFX combustion testing (see attached).

My daily driver set-up:
13B-COSMO (Judge Ito street ported)
peak power @ about 7800rpm
3" exhaust 1 muffler (Racing Beat single)
Cool intake box with 9" K&N.
and either fitted with T04s or T04z both use a 1.0 A/R .
9.0:1 compression ratio and about 38 deg C charge temp.

@ 15 boost T04s 50/50 WM injection (pre turbo and post intercooler).
it made 492 bhp @ 7730 rpm

(15/14.5) = 1.034
1.034 + 1 = 2.034 bar absolute pressure
492 / 2.034 = 242 bhp
Works out to 242 bhp @ engine N/A

at 18 psi and the T04z 50/50 WM injection and optimized ignition advance it made
580bhp @ 7854 rpm engine power

(18/14.5) = 1.241
1.241 + 1 = 2.241 bar absolute pressure
580 / 2.241 = 258.8 bhp
Works out to 258.8bhp @ engine N/A

*Personally your figures are way too high since you are not taking into account friction or if you are underestimating it? in the software deriving the bhp? thus it would be good to actually measure the 'brake' power directly rather than software estimation? (my thoughts on it) based off my experience and engine combos listed already that are well known.
This is where testing it with a VBOX (if you don't trust 'dyno's' would help)*

So this is indicated power of a single cycle, do you have a mean bhp? (bhp = iP-fP) over at least 1 second that you can average to confirm a 'statistical average of say at least ~100 cycles' mean pressure acting and thus power level for the sake of comparison to steady state measurement principles.

Thanks.

p.s. Have you ever tested your car for brake power on any system other than this to validate what it is saying you have? How are you or it measuring the frictional power (fP) loss in the engine????, you have the 'indicated power' through pressure from what I can see you posted, but its not what is coming out of the engine (brake horse power), like to know some more on how you derive your power figure? For others who don't know what I am on about here is a Laymans link > http://en.wikipedia.org/wiki/Testing..._of_IC_engines

02-01-2014, 11:55 PM	#28
RICE RACING Don Mega Join Date: Dec 2008 Location: Utopia Posts: 1,688 Rep Power: 18	[QUOTE=Barry Bordes;274121]Hey Peter, We are having a Global Warming snow storm in New Orleans. Go figure. Everything is shut down so I thought I would contribute. Probably apples and oranges as far as taking data compared to your system. Mine from the TFX combustion testing (see attached). My daily driver set-up: 13B-COSMO (Judge Ito street ported) peak power @ about 7800rpm 3" exhaust 1 muffler (Racing Beat single) Cool intake box with 9" K&N. and either fitted with T04s or T04z both use a 1.0 A/R . 9.0:1 compression ratio and about 38 deg C charge temp. @ 15 boost T04s 50/50 WM injection (pre turbo and post intercooler). it made 492 bhp @ 7730 rpm (15/14.5) = 1.034 1.034 + 1 = 2.034 bar absolute pressure 492 / 2.034 = 242 bhp Works out to 242 bhp @ engine N/A at 18 psi and the T04z 50/50 WM injection and optimized ignition advance it made 580bhp @ 7854 rpm engine power (18/14.5) = 1.241 1.241 + 1 = 2.241 bar absolute pressure 580 / 2.241 = 258.8 bhp Works out to 258.8bhp @ engine N/A Personally your figures are way too high since you are not taking into account friction or if you are underestimating it? in the software deriving the bhp? thus it would be good to actually measure the 'brake' power directly rather than software estimation? (my thoughts on it) based off my experience and engine combos listed already that are well known. This is where testing it with a VBOX (if you don't trust 'dyno's' would help) So this is indicated power of a single cycle, do you have a mean bhp? (bhp = iP-fP) over at least 1 second that you can average to confirm a 'statistical average of say at least ~100 cycles' mean pressure acting and thus power level for the sake of comparison to steady state measurement principles. Thanks. p.s. Have you ever tested your car for brake power on any system other than this to validate what it is saying you have? How are you or it measuring the frictional power (fP) loss in the engine????, you have the 'indicated power' through pressure from what I can see you posted, but its not what is coming out of the engine (brake horse power), like to know some more on how you derive your power figure? For others who don't know what I am on about here is a Laymans link > http://en.wikipedia.org/wiki/Testing..._of_IC_engines Last edited by Barry Bordes; 08-28-2015 at 10:07 AM.