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 The Effects of Ambient Temp on Acceleration

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PostSubject: The Effects of Ambient Temp on Acceleration   Wed Oct 03, 2007 12:00 pm

Last week I did a WOT at 85F ambient temp. This week I did a near identical run at 75F. Same location, same mods (3.4" SC pulley), same tune, same fuel (94 oct). Here are the results:



The 75F (yellow) curve does spin out a tad at the launch, but notice it stays ahead of the 85F (orange) curve the whole time, and starts to gain slightly up top. KR (not shown) was minimal for both runs. I plan to do more tests for 65F and lower temps to show the effects of colder air on our engines. Also will compare 3.3", 3.2", and maybe 3.1" SC pulley if possible.

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'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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PostSubject: Re: The Effects of Ambient Temp on Acceleration   Thu Oct 04, 2007 4:53 pm

was IAT the same?
it will be nice to prove how air temps change our engines dramaticly...nobody believes me when i say it feels so slow when its 90* outside.

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1996 with 244k miles, L324" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs.
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PostSubject: Re: The Effects of Ambient Temp on Acceleration   Thu Oct 04, 2007 6:08 pm

quote: "was IAT the same?"

No, IAT was of course higher on the 85F day. This is the reason for the performance increase.

Below is the same graph, but including IAT curves for the 85F (red) and 75F (green) ambient temps. My IAT sensor typically reads close to true ambient immediately after a WOT run, and according to the numbers, my 85F day was actually 88F. My 75F day was actually 72F. I try to take the car out when it's exactly the right temperature, but sometimes things can change by the time I get to "the track".


_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
AA
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Name : Aaron
Age : 40
Location : C-bus, Ohio
Joined : 2007-01-13
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PostSubject: Re: The Effects of Ambient Temp on Acceleration   Sat Oct 13, 2007 4:26 pm

Here's a new graph with a 55F run added:



The 55F run is using a slightly different tune, but I think the results would be the same as it's close to the old tune at this point. I'm seeing the lower temps are making less of a difference now. Time to drop pulley size...

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
AA
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Name : Aaron
Age : 40
Location : C-bus, Ohio
Joined : 2007-01-13
Post Count : 18310
Merit : 239

PostSubject: Re: The Effects of Ambient Temp on Acceleration   Thu Oct 25, 2007 6:38 pm

Today I did another WOT run at 60F with the 3.3" SC pulley. Interestingly, the result was EXACTLY the same as my run at 55F with the 3.4" pulley (green line above). I was very surprised at how close they were.

Just shows how much ambient temps can affect your times... just 5F can make as much impact as a pulley swap!

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
 
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