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 Post subject: Time to eat crow dudes.
Posted: Thu Apr 10, 2008 4:49 pm 
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I knew the first dyno readings i got were high but just how high i didn't know.
Went on the shootout dyno at AUTO-TECH in Toowoomba and went 210RWKW.
Real world figures and a good place to start.
Pete and Griffo at AUTO-TECH are now going to stock Raptor superchargers as they liked the system and it's in their view "money well spent".
270RWHP is 300+EKW on this dyno so i'm over 300kw and if i get the pics up you'll see we were a bit rich at that figure but we ran out of time and had to finish there.

 

 

Attachments:
File comment: A wee bit on the rich side.
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File comment: 9lb of boost,will have to sort out the inlet.
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Cooky_003[1].JPG [ 919.63 KiB | Viewed 51 times ]
File comment: Torque curve is good.
Cooky_001.jpg
Cooky_001.jpg [ 411.34 KiB | Viewed 65 times ]

 

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Posted: Thu Apr 10, 2008 4:53 pm 
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how are the AFR's? is the line smooth?

 

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Posted: Thu Apr 10, 2008 4:54 pm 
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Top picture dude.

 

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P'maker headers',Hi flow cat,3" sports sytem,
Raptor V-clutched lightweight not intercooled,no tranny cooler,no worries.

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Posted: Thu Apr 10, 2008 4:58 pm 
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Ride: EF XR8 347

Power: 232 rwkw

Location: Perth
WA, Australia

this a 6 cyl BA?

 

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Posted: Thu Apr 10, 2008 9:07 pm 
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Power: 229 rwkw

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Yup,

Good stuff.

280 is 210 rwkw, she seems to be all there mate. Well done.

 

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'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

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Posted: Thu Apr 10, 2008 9:18 pm 
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Nice graphs.

Whats next on the agenda for it?
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Posted: Thu Apr 10, 2008 9:38 pm 
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Power: 608 rwkw

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why was it run in 2nd? pretty low torque for a 2nd gear pull

 

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Posted: Thu Apr 10, 2008 10:08 pm 
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An SS Holden V8 has about 1170 lb of tractive force i have 1480 lb so it can't be too bad , the graph is photographed on an angle so it looks like it's falling away when it ain't.
It would hit the cut out in 3rd is why.
Actually we got those AFR's with a fuel pressure regulator at 35psi and left it slightly rich as we ran out of time. Pete at AUTO-TECH has offered to fine tune it free off charge as he's got an interest now.
Next is a 12lb pulley to match the peak torque to the power curve,in my head that should be a real gain in driveability.
Did ya notice the Air temp compared to the Inlet temp there's plenty of room to grow guys.

 

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Posted: Thu Apr 10, 2008 10:28 pm 
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Tell him to fix the scale on the AFR axes when he prints your next run.
Whats the blue run, the tune it was on before you got in there?
Looks lean but its hard to tell with that scale LOL
210rwkw is good, dunno about over 300kw at the engine, but yeah, good result.

And yes I noticed the ambient temp to the inlet temp LOL
It's shootout mode mate, it has corrections for that.
An inlet temp thats higher then ambient temp actually means a higher reading :P

 

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Posted: Fri Apr 11, 2008 12:46 am 
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i thought the general rule of thumb was rwhp= flywheel kw.. loosely give or take a bit... therefore wouldnt 270 rwhp make for around 270 at the fly?

 

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Posted: Fri Apr 11, 2008 1:17 am 
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AFR's look ok at 12:1, i know forced induction like abit more fuel so it may be able to take abit more. The first run seems dangerously lean at what looks like around 14-14.5:1. SteadyED is right it would have been easier to read if the AFR axis was set out better.

More Grunt wrote:
i thought the general rule of thumb was rwhp= flywheel kw.. loosely give or take a bit... therefore wouldnt 270 rwhp make for around 270 at the fly?


Thats an old school saying but it definately aint true. Neither is the statement that the car in question making 210rwkw has 300kw @ the f/wheel. More like about 250kw. Last dyno run i pulled 317rwhp which i think would make my engine around 285kw.
General rule of the thumb and being more accurate is that you lose 17-20% power through the manual 5spd and 20-22% through an auto.

 

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Posted: Fri Apr 11, 2008 1:32 am 
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More Grunt wrote:
i thought the general rule of thumb was rwhp= flywheel kw.. loosely give or take a bit... therefore wouldnt 270 rwhp make for around 270 at the fly?


yer thats what i go on

as a "rough" guide

 

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Posted: Fri Apr 11, 2008 9:51 am 
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Disco Frank wrote:
More Grunt wrote:
i thought the general rule of thumb was rwhp= flywheel kw.. loosely give or take a bit... therefore wouldnt 270 rwhp make for around 270 at the fly?


yer thats what i go on

as a "rough" guide


Slightly O/T, The most accurate way to measure lost is after an engine rebuild or during engine performance development. meaning hooking the engine onto a engine dyno. same goes for all performance turn key grate engines. they were tested & run-in directly from the flywheel.

Example- If I was to have my engine rebuild & blueprinted, I'll have it develop on an engine dyno. say after a couple of engine tear downs between dyno runs, finally the builder made the perfect engine combo that made the best reading of 305fwkw out of the other runs.

drop the engine in and away you go. a couple of weeks later you decide to squeeze a little bit more poke. you run it on the roller dyno and find out you've lost 31%, thats your first base run before the up grade!
engine dyno=305fwkw, roller dyno=210rwkw.

I think badcooky's would get a better reading if he was to run an intercooler or water/meth injection, & tune the air fuel ratio correctly.

The lost is just a guide to give you an idea whats at the flywheel. the best way is engine dyno then roller dyno. just to let you know beforehand that its an expensive excise having it develop on an engine dyno. especially the time sorting out strong engine parts & tear downs for the perfect compination... parts & "TIME" $$$$$

 

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Posted: Fri Apr 11, 2008 11:17 am 
Getting Side Ways
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Power: 253 rwkw

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on the episode of top gear when they did the 10,000p 1970's supercar challenge they had to dyno them to see how much hp they had lost over time... when they were on the dyno after the run, they did a "run down" on which the dyno measured the drivetrains resistance to convert rwhp to hp at the flywheel. as far as I understand it. Why dont we do that over here?

 

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Posted: Fri Apr 11, 2008 11:30 am 
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Did you mean over time as in the life of the engine? OR measurement over time as back to back runs with the bonnet closed?

 

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