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The Pub For General Automotive Related Talk |
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#1 | |||
FF.Com.Au Hardcore
Join Date: Dec 2004
Location: The Patch
Posts: 1,011
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Quick question that will hopefully get a straight answer. How does the gear a car is run in effect the power output?
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#2 | ||
SnortPerformance.com
Join Date: Aug 2005
Location: Brisbane, QLD
Posts: 1,430
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If it does at all it would only acount for a mnimal difference of say 1 or 2 horse power.
The only real difference between gears on a dyno is the speed that your rear wheels reach on the dyno. However, having said that, it is best to run a car, on the dyno, in the gear that is closest to a 1:1 ratio. Then you are purely testing engine power at the wheels. But like I said the difference is so small it's not worth worrying about. |
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#3 | |||
FORMERLY TX3DUDE
Join Date: Jan 2005
Location: "THE GONG"
Posts: 2,487
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on a turbo car it can load the car lower in the rev range giving you a false torque hence power curve
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#4 | |||
FF.Com.Au Hardcore
Join Date: Dec 2004
Location: The Patch
Posts: 1,011
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Load the car?
How do you explain a stock (187kw engine, not mine) R33 GTS-T getting 182rwkw in 3rd gear? That's around 40rwkw too high. What about a modified one with 200rwkw in 4th over 240rwkw in 3rd? Those were on different days, different dynos.
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#5 | |||
TL40 Wagon?
Join Date: Dec 2004
Location: Sydney
Posts: 2,377
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Variance between them is huge. Its not so much the gear as the dyno and operator. |
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#6 | |||
FF.Com.Au Hardcore
Join Date: Dec 2004
Location: The Patch
Posts: 1,011
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a 187kw car can't get 182rwkw though surely? That's almost no drivetrain loss. I think I confused you with the last bit I meant the 2 cars were on different days the one with 200 then 240 was on the same dyno same day.
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#7 | ||
KITTY Crew Member
Join Date: Sep 2005
Location: WA
Posts: 5,267
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true measurements are made in a gear with 1:1 ratio, normally 4th. Any lower gear creates a mechanical advantage thus increasing torque etc.
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FOR SALE BAII Super Pursuit 0083 ![]() Awsome power by XTREME FORD TUNING 500rwkw New ALLOY Block Awesome exhaust by THE EXHAUST CENTRE MIDLAND Awesome Kenne Bell Supercharger setup by AGRO! and Bluepower Racing Developments Now with full DOT approval and Permitted for road use
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#8 | |||
TL40 Wagon?
Join Date: Dec 2004
Location: Sydney
Posts: 2,377
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#9 | |||
The one and only
Join Date: Dec 2004
Location: Carrum Downs, Victoria
Posts: 9,053
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Quote:
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1992 DC LTDHO 360rwkw built by me Tuned by CVE Performance Going of the rails on a crazy train Other cars include Dynamic ED Sprint, Dynamic DL LTD, Sparkling Burgundy DL LTD, Yellow, Red & Blue XB sedan & Black XB Coupe
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#10 | ||
Formerly Black EX-R6
Join Date: Jan 2005
Location: Earth
Posts: 1,265
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geez, 15' wheels, freeking HUGE rims. He musta rolled the guards im betting.
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""It's not the ideal way to win, but we got here, so yeah baby," said Kelly." Stinking, mongrel, dog. |
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#11 | ||
The Fun Mobile
Join Date: Dec 2004
Location: Cairns
Posts: 5,219
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I done many runs with my 3 sp auto, in 2nd and 3rd and it makes 1 or 2 hp difference maxx. Like stated, the dyno can tell with the different wheel speeds.
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408 cube Cleveland TFC @ AFD 2V, 750 DP 10.7 @ 125 mph 2V powahhhhh |
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#12 | |||
Two > One
Join Date: Dec 2004
Location: Adelaide
Posts: 7,063
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Quote:
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1978 LTD - 408ci - 11.5@120.6mph - 2004 S4 - 4.2 - M6 - quattro - |
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#13 | |||
buickman
Join Date: Dec 2004
Location: eastern suburbs Melb Vic
Posts: 1,462
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[QUOTE=Black XR6]
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They were back in the 70's & early 80's |
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#14 | |||
The Fun Mobile
Join Date: Dec 2004
Location: Cairns
Posts: 5,219
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Quote:
Are you driving a monster monster truck. haha
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408 cube Cleveland TFC @ AFD 2V, 750 DP 10.7 @ 125 mph 2V powahhhhh |
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#15 | ||
Regular Member
Join Date: Mar 2005
Location: melbourne
Posts: 106
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was the dyno in shootout mode? if not the figures can be played with.....
eg a 100hp engine could be made to look like it is a 200hp engine... next time look at the dyno screen, and see if it says "shootout mode", if not, they could be having you on |
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#16 | ||
KITTY Crew Member
Join Date: Sep 2005
Location: WA
Posts: 5,267
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Sorry looks like i am all torque
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FOR SALE BAII Super Pursuit 0083 ![]() Awsome power by XTREME FORD TUNING 500rwkw New ALLOY Block Awesome exhaust by THE EXHAUST CENTRE MIDLAND Awesome Kenne Bell Supercharger setup by AGRO! and Bluepower Racing Developments Now with full DOT approval and Permitted for road use
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#17 | ||
○○○○○○○○○○○○○○○○○○○○ ○○○○○
Join Date: Mar 2005
Posts: 5,954
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so basically, dynos are lying pieces of crap, and are usless apart from when tuning.
I am sure there are ways to exploit dynos with diff ratios etc, probably what the dyno queens do. hahaha |
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#18 | |||
Two > One
Join Date: Dec 2004
Location: Adelaide
Posts: 7,063
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Quote:
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1978 LTD - 408ci - 11.5@120.6mph - 2004 S4 - 4.2 - M6 - quattro - |
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#19 | |||
TL40 Wagon?
Join Date: Dec 2004
Location: Sydney
Posts: 2,377
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#20 | ||
Ute Forum Moderator
![]() Join Date: Dec 2004
Location: Melb
Posts: 7,227
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I would say only a small power difference due to the faster turning tailshaft, diff centre, axles & wheels absorbing a bit more power. 18 vs 15 inch rims will be heavier with the weight further from the centre so they will actually take more power to accelerate.
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