3.17 gears
- Thread starter pssd eco
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EcoBrick Bob
SHO Member
Depends....
SHOvinstuff
Member
What have people run at the track with and w/o the PP, completely stock? That'll give you your 1/4 mile time. I thought Insideline had tested our cars and ran like 13.8 s with the PP and 14.1 w/o it, but that's off the top of my head.
RB Designs
New Member
The differance is very slight and I doubt it make a 2 tenth improvement. In a modded car the taller gears would be the way to go. IMHO These things
are designed for low end power and the taller gears actually "load" the turbos
more. I wouldn't be surprised with all things being equal the higher gears win.
SHOvinstuff
Member
I looked it up really quickly:
non-pp, 14.2 s at 99 mph
http://www.insideline.com/infiniti/...-taurus-sho-vs-2009-infiniti-g37-journey.html
and
http://blogs.insideline.com/straigh...ed-2010-ford-taurus-sho-vs-pontiac-g8-gt.html
pp, 13.7 at 103 mph
http://www.motortrend.com/roadtests/sedans/112_0909_2010_ford_taurus_sho_test/performance_price.html
Since the trap speeds are pretty similar, the PP is probably launching a lot harder off the line. I think if they gave 60' times that would tell the whole story.
The taller numerical gear ratio increases the torque to the wheels while decreasing the wheel speed given the same engine RPM and transaxle gear ratio vs. a lower numerical gear ratio. You can't change power through gearing, power is torque times speed. All you do with gears is balance the speed and torque differently. Given that, the 10% increase in gearing gives you faster acceleration at the expense of lower fuel economy (engine is always running higher RPM).
The change in "load" to the turbos is not real, what I think you mean is that you are running the engine at a different speed than you would be with different gearing. This is important if you have a narrow powerband (such as a car with a mid-top range powerband like most turbocharged engines that have noticeable "lag," with weak low RPM response) and want to have higher gear ratios to keep engine speed up and out of the low RPM range. This is not important on our engines that produce significant torque at low engine speeds. Gearing in this case is for torque improvement, and not to keep the engine in a certain RPM band.
By the way, I am in the powertrain and driveline testing portion of this industry.
What I want to know is what people on this forum have run with PP and non-PP SHO's that are bone stock. How do these compare? Is the 0.5 s difference in the 1/4 mile from the websites above repeatable? This is what matters to me, if it matters at all. I'm sure people have posted time on here, I just haven't looked and figured someone would post their times.
EcoBrick Bob
SHO Member
Another factor that needs to be considered is where each vehicle is in the powerband of it's gearing at the 60 ft mark, 1/8 mi and 1/4 mi.
Using a Pontiac G8 Gt as an example, many drag racers hold them in 3rd and let them bounce off the rev limiter rather than let them shift into 4th, as the shift costs a couple tenths. To keep car from hitting rev limiter, one has to either increase the rev limiter setting or increase tire diameter.
Another consideration that hasn't been discussed is weight of your wheels/tires. 20" wheels/tires are generally heavier by a few pounds each. That could bring performance between reg. SHO and PP SHO with 20"s, closer in times. With my Brick... I have shorter & lighter 18" tires/wheels. Have saved over 60 total lbs. My axle ratio is an effective 3.40 up from stock 3.16. Still, my mileage is not worse, likely because I have a 3+ inch lower Flex (only 63" tall) and a lower un-sprung weight.
Using a Pontiac G8 Gt as an example, many drag racers hold them in 3rd and let them bounce off the rev limiter rather than let them shift into 4th, as the shift costs a couple tenths. To keep car from hitting rev limiter, one has to either increase the rev limiter setting or increase tire diameter.
Another consideration that hasn't been discussed is weight of your wheels/tires. 20" wheels/tires are generally heavier by a few pounds each. That could bring performance between reg. SHO and PP SHO with 20"s, closer in times. With my Brick... I have shorter & lighter 18" tires/wheels. Have saved over 60 total lbs. My axle ratio is an effective 3.40 up from stock 3.16. Still, my mileage is not worse, likely because I have a 3+ inch lower Flex (only 63" tall) and a lower un-sprung weight.
RB Designs
New Member
good points.......the 19" stock tires that my SHO came with are 28.1" and the
20" optional wheels that come with the PP are taller at 28.7" which makes the ratio differance less of a factor
How does your 60ft and mph compare?
EcoBrick Bob
SHO Member
The "Brick's 20" Goodyear RSA's are 29.1" tall and 32 lbs.
The Conti. Extreme DW (Summer extra load tires] that actually have a higher load rating than 20"s) are 27.0" tall and only 26 lbs.
For comparison with Darrell... my 60 ft times with TC ON... were from 1.956-1.969 & 1/8 mi from 8.64-8.67. Would guess my weight w/driver at close to 5,000 lbs. Was around 75 deg.. and it rained before and after last run, which was slowest.
There is an even bigger difference in wheel weight (9 lbs ea). The ASA AR-2 V2's are an average weight 18" wheel. Could have saved even more weight with a higher end-lighter weight forged wheel.
Does require an adjustment to speedometer via computer.
The Conti. Extreme DW (Summer extra load tires] that actually have a higher load rating than 20"s) are 27.0" tall and only 26 lbs.
For comparison with Darrell... my 60 ft times with TC ON... were from 1.956-1.969 & 1/8 mi from 8.64-8.67. Would guess my weight w/driver at close to 5,000 lbs. Was around 75 deg.. and it rained before and after last run, which was slowest.
There is an even bigger difference in wheel weight (9 lbs ea). The ASA AR-2 V2's are an average weight 18" wheel. Could have saved even more weight with a higher end-lighter weight forged wheel.
Does require an adjustment to speedometer via computer.
RB Designs
New Member
wow thats quite a bit quicker......it must really help a lot
EcoBrick Bob
SHO Member
Darreli's Times "Brick Times"
Oct 1 -75 deg high humidity
60ft...........1.8639 1.956 .12
330ft..........5.2890 5.587 .3
1/8 ET........8.186 8.641 .45
1/8 MPH......85.20 80.54 4.7 mph
1000' ET......10.6941 11.285 .59
1000' MPH....98.25
1/4 ET.........12.788 13.522 .734
1/4 MPH.......110.12 100.74 9.38 mph
Quite a bit of difference!
And my reaction times were so slow... that a friend at TireRack claims he could have downed a chili cheese dog and a coke before I left the line!
(NOTE: I TRIED TO EDIT THIS TO SPACE IT PROPERLY BUT NOT POSSIBLE)
Oct 1 -75 deg high humidity
60ft...........1.8639 1.956 .12
330ft..........5.2890 5.587 .3
1/8 ET........8.186 8.641 .45
1/8 MPH......85.20 80.54 4.7 mph
1000' ET......10.6941 11.285 .59
1000' MPH....98.25
1/4 ET.........12.788 13.522 .734
1/4 MPH.......110.12 100.74 9.38 mph
Quite a bit of difference!
And my reaction times were so slow... that a friend at TireRack claims he could have downed a chili cheese dog and a coke before I left the line!
(NOTE: I TRIED TO EDIT THIS TO SPACE IT PROPERLY BUT NOT POSSIBLE)
Last edited:
RB Designs
New Member
reaction time does not change your et. though, clocks do not start till you break the timing beam
Showgun
Canuck SHO
Are these gears optional on cars delivered here in Canada? Any canucks out there who may know?
Seems they're part of a performance package in car delivered in the US but I don't see that option up here in Canada.
Thanks,
SG
zeus268
Maple Leaf SHO
No PP in Canada
We also get screwed on the headlights..... no HID in Canada eitherThe only benefit we get is if you get into an accident our healthcare system will take care of you :woo-hoo:
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