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Author Topic: Omega booked in for the dyno  (Read 12671 times)

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minifreek

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Re: Omega booked in for the dyno
« Reply #45 on: 19 January 2017, 08:21:31 »
Engine spec....

2.5 Litre V6 24valve blueprinted Vectra Challenge engine...

ECU remapped...

Pipercross cams x 4, basically reground G cams...

Heads ported polished and port matched to inlets... with slightly bigger valves...

Saab V6 injectors....

Ported and polished throttle body (made no difference TBH but meh...)

3.0 litre longnose plenum

Decatted with custom freeflow SS custom exhaust system with X pipe to balance exiting gasses.... (skiving system I believe its called)

EGR removed....

AC system removed...

3.0 bottom pulley (not quite as light as a Courtney alloy pulley but damn near)


RR figures might have been 'massaged' a bit, as it was done with another club at a RR day that they used to hold every couple of months.... but operator couldn't get the full power onto the rollers as the gearbox kept changing down a gear when he booted it to get the power figure, but by god he tried for almost an hour.... LOL

« Last Edit: 19 January 2017, 08:23:10 by minifreek »
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Kevin Wood

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Re: Omega booked in for the dyno
« Reply #46 on: 19 January 2017, 10:22:29 »
With that work done I could well believe it's accurate. :y
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Kevin Wood

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Re: Omega booked in for the dyno
« Reply #47 on: 19 January 2017, 10:38:38 »
Dave Walker's web site has a nice article for those who want to discover the strengths and weaknesses of rolling road testing...

http://www.emeraldm3d.com/rolling-road

« Last Edit: 21 January 2017, 17:15:43 by Kevin Wood »
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Webby the Bear

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Re: Omega booked in for the dyno
« Reply #48 on: 21 January 2017, 16:52:34 »
Interesting read guys. Due to work commitments ive changed it to the 9th Feb.

As said I'll be having a word with the chap and stressing tat I don't want to be flattered. I want the true result.

so as to absorb all what's been said.....

The 167ftlb of torque at the fly wheel... does anyone know what rpm that's at? I'm assuming I'll see this figure (minus drivetrain loss) at the rpm that vx got it at?
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anV6

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Re: Omega booked in for the dyno
« Reply #49 on: 21 January 2017, 17:02:27 »
Quote from: minifreek on 19 January 2017, 08:21:31
Engine spec....

2.5 Litre V6 24valve blueprinted Vectra Challenge engine...

ECU remapped...

Pipercross cams x 4, basically reground G cams...

Heads ported polished and port matched to inlets... with slightly bigger valves...

Saab V6 injectors....

Ported and polished throttle body (made no difference TBH but meh...)

3.0 litre longnose plenum

Decatted with custom freeflow SS custom exhaust system with X pipe to balance exiting gasses.... (skiving system I believe its called)

EGR removed....

AC system removed...

3.0 bottom pulley (not quite as light as a Courtney alloy pulley but damn near)


RR figures might have been 'massaged' a bit, as it was done with another club at a RR day that they used to hold every couple of months.... but operator couldn't get the full power onto the rollers as the gearbox kept changing down a gear when he booted it to get the power figure, but by god he tried for almost an hour.... LOL

Looks like a lot of work indeed. Well done on getting that extra power without resorting to forced induction.  :y
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LC0112G

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Re: Omega booked in for the dyno
« Reply #50 on: 21 January 2017, 19:57:47 »
Quote from: Webby the Bear on 21 January 2017, 16:52:34
Interesting read guys. Due to work commitments ive changed it to the 9th Feb.

As said I'll be having a word with the chap and stressing tat I don't want to be flattered. I want the true result.

so as to absorb all what's been said.....

The 167ftlb of torque at the fly wheel... does anyone know what rpm that's at? I'm assuming I'll see this figure (minus drivetrain loss) at the rpm that vx got it at?

This site : http://www.carfolio.com/specifications/models/car/?car=198759

says 168 bhp @ 6000 RPM, and 167 ft/lb @ 3200 RPM

No Idea where the data comes from.
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Doctor Gollum

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Re: Omega booked in for the dyno
« Reply #51 on: 21 January 2017, 20:44:40 »
Quote from: LC0112G on 21 January 2017, 19:57:47
Quote from: Webby the Bear on 21 January 2017, 16:52:34
Interesting read guys. Due to work commitments ive changed it to the 9th Feb.

As said I'll be having a word with the chap and stressing tat I don't want to be flattered. I want the true result.

so as to absorb all what's been said.....

The 167ftlb of torque at the fly wheel... does anyone know what rpm that's at? I'm assuming I'll see this figure (minus drivetrain loss) at the rpm that vx got it at?

This site : http://www.carfolio.com/specifications/models/car/?car=198759

says 168 bhp @ 6000 RPM, and 167 ft/lb @ 3200 RPM

No Idea where the data comes from.
Presumably factory/production/sales literature...

Rpm figures look reasonable  ;)
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TheBoy

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Re: Omega booked in for the dyno
« Reply #52 on: 22 January 2017, 18:45:34 »
Quote from: YZ250 on 18 January 2017, 13:26:50
I'm not in to the figures malarkey myself. If, hypothetically, I floored it off the lights and the car next to me outruns me, and I can't catch him, then he has a faster car. No maths involved there, quite ingenious really isn't it.  :) 
Not that you'd ever do such things Mr YZ, as you are now a reformed character and have seen the light that speed is supposed to be evil ;)
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Webby the Bear

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Re: Omega booked in for the dyno
« Reply #53 on: 22 January 2017, 19:07:24 »
Quote from: LC0112G on 21 January 2017, 19:57:47
Quote from: Webby the Bear on 21 January 2017, 16:52:34
Interesting read guys. Due to work commitments ive changed it to the 9th Feb.

As said I'll be having a word with the chap and stressing tat I don't want to be flattered. I want the true result.

so as to absorb all what's been said.....

The 167ftlb of torque at the fly wheel... does anyone know what rpm that's at? I'm assuming I'll see this figure (minus drivetrain loss) at the rpm that vx got it at?

This site : http://www.carfolio.com/specifications/models/car/?car=198759

says 168 bhp @ 6000 RPM, and 167 ft/lb @ 3200 RPM

No Idea where the data comes from.

Thanks LC.

I kind of assumed that the two figures for torque and hp would be at the same rpm?
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Re: Omega booked in for the dyno
« Reply #54 on: 22 January 2017, 19:15:40 »
Nope, because they do different things... strong torque lower down the rev range is good for getting moving and keeping moving, the higher the engine revs, the more power it produces...

Look at a bike engine, 6-800 cc producing the equivalent of 500bhp per ton at 12,000 rpm, yet produce minimal torque.
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Webby the Bear

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Re: Omega booked in for the dyno
« Reply #55 on: 22 January 2017, 19:21:26 »
Thanks al. Keep in mind I've never even seen a dyno report.......

So I'll be able to look at torque at 3000rpm. Measure against the above figures. And then look at 6000rpm and compare hp against the above figures?

So could I have a scenario where my horse power figure is about right but I'm down on torque?
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Doctor Gollum

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Re: Omega booked in for the dyno
« Reply #56 on: 22 January 2017, 19:33:02 »
Possibly,  but they are related, just not in a linear way. Don't forget also that the engine is designed to perform a particular function in a reliable and efficient manner... a race tuned custom build will produce very different curves ;)
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Migv6 le Frog Fan

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Re: Omega booked in for the dyno
« Reply #57 on: 22 January 2017, 20:01:20 »
Quote from: Doctor Gollum on 22 January 2017, 19:15:40
Nope, because they do different things... strong torque lower down the rev range is good for getting moving and keeping moving, the higher the engine revs, the more power it produces...

Look at a bike engine, 6-800 cc producing the equivalent of 750bhp per ton at 12,000 rpm, yet produce minimal torque.

Fixed.  :).....but absolutely correct otherwise.  :y
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Doctor Gollum

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Re: Omega booked in for the dyno
« Reply #58 on: 22 January 2017, 20:02:36 »
 ;)
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Webby the Bear

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Re: Omega booked in for the dyno
« Reply #59 on: 22 January 2017, 20:30:04 »
Ok. Well let's see what the report says. All I want to do is slap a report in front of u guys and determine whether it's producing same power and torque as when it was factory fresh. Or whether it's down. That's all 👌👍😀 remember also I am a simple bear 🐻 😂
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