What does a tune do, specifically?
02-25-2008, 04:39 PM
#1
2nd Gear Member
Thread Starter
Join Date: Sep 2006
Location: Long Island, New York
Posts: 185
What does a tune do, specifically?
just wondering exactly what a tune does. How do they change the computer to increase performance? How does it "teach" the car to use higher octane fuel, etc..
anyone know?
anyone know?
02-25-2008, 04:46 PM
#2
5th Gear Member
Join Date: Apr 2007
Location: The High Country
Posts: 3,547
RE: What does a tune do, specifically?
Simply put, it tells the computer to advance the timing to make a little more HP and allow for quicker throttle responce. Because the timing is advance, it forces you to use a higher octane but lessor BTU gasoline to allow for a cooler burn.
02-25-2008, 05:12 PM
#3
4th Gear Member
Join Date: Dec 2007
Location: Pacific Palisades, CA
Posts: 1,834
RE: What does a tune do, specifically?
it teaches the user to try the search button.
and allow the car to breathe more efficiently and it's not out of breath all the time so it can do those 100 mile runs in the morning.
and allow the car to breathe more efficiently and it's not out of breath all the time so it can do those 100 mile runs in the morning.
02-25-2008, 07:21 PM
#6
Join Date: Oct 2007
Location:
Posts: 21
RE: What does a tune do, specifically?
As you add components which allow more airflow such as intakes and, to a lessor extent, less restrictive exhaust, the air fuel mixture will become more lean. In order to compensate for the increased airflow, more fuel needs to be added to bring the A/F ratio down to an optimum level. The end result is an increase of fuel entering the engine - more horsepower.
To ensure the engine doesn't experiencepre-ignition, (pinging), in stock tune using various brands of 87 octane fuels, the manufacturer retards the timing to a conservative value. While this prevents pinging, it robs horsepower.
A tune will add more fuel, and advance the timing. As timing is advanced, within limits, horsepower will increase. Octane helps prevent pre-ignition, so a 93 tune can have the timing advanced further than an 87 tune. This is why you can't use 87 octane with a 91 or 93 tune as pre-ignition will result which can damage the engine. A tune can adjust other things such as idle speed, shift points in automatics, cooling fanturn on temperature, etc., but the biggest advantage is the timing advance and the addition of fuelgives. that a tune .
To ensure the engine doesn't experiencepre-ignition, (pinging), in stock tune using various brands of 87 octane fuels, the manufacturer retards the timing to a conservative value. While this prevents pinging, it robs horsepower.
A tune will add more fuel, and advance the timing. As timing is advanced, within limits, horsepower will increase. Octane helps prevent pre-ignition, so a 93 tune can have the timing advanced further than an 87 tune. This is why you can't use 87 octane with a 91 or 93 tune as pre-ignition will result which can damage the engine. A tune can adjust other things such as idle speed, shift points in automatics, cooling fanturn on temperature, etc., but the biggest advantage is the timing advance and the addition of fuelgives. that a tune .
02-25-2008, 07:35 PM
#7
Is the tide gonna reach my chair?
Join Date: Mar 2007
Location: Nor'east
Posts: 4,389
RE: What does a tune do, specifically?
The SCT Tuneradjusts the air-fuel ratio: From FordMuscle:
Ford rates the motor at 300 horsepower and 320 lb-ft. Peak horsepower is said to be at 5750 rpm. We put the car on a Mustang Chassis Dyno at Custom Dyno Tuning in Hayward, California. In as-delivered form our test Mustang spun the wheels to 255 horsepower at 5150 and 277 lb-ft of torque at 4300. Granted we expect about 8-10% lower numbers on a Mustang dyno than a Dynojet, our power curve did not match that of other 05 Mustang's. Examining the air-fuel ratio revealed a conservative 11.8:1 ratio up to 5100, then a drop to 10.8:1 which continues to decline to 6000 rpm. As a result of the rich tune, power suffers horribly, and where we see 05's carrying a steady horsepower from 5000 to 6000 rpm, our car drops from 255 a 5150 to 235 at 5800.
2005 Mustang GT - Manual Transmission (Ford Media Test Vehicle)
Location: Custom Dyno Tuning Hayward, CA (510)331-0608[/b]
Type: Mustang Dynomometer MD-1100[/b]
The new 05's are looking to be a huge hit amongst enthusiasts, racers and the aftermarket.
Explanation? With a build date of August 2004 we suspect our media car is one of the first 05's off the assembly line. Other publications have also indicated observing very conservative tunes on the early media cars - perhaps Ford was playing it safe until they had more run time data on the production engines. Whatever is the case, the dyno results hardly detracted from our experience with the car, and the 05's coming from the dealership seem to be holding nothing back. The dyno results we've seen show the manual GT's to be pulling hard to 6000 with air-fuel ratios in the 12.x range. With an aftermarket high-flow air intake and tune they are picking up as much as 30 horsepower to the rear-wheels. And there is more left. With Ford announcing the new SVT GT500 Cobra the furvor around the 2005 Mustang GT is just starting. Like the vintage Mustangs and Fox-body Mustangs, the new S197 platform is destined to be another huge success for enthusiasts and the aftermarket alike.
Ford rates the motor at 300 horsepower and 320 lb-ft. Peak horsepower is said to be at 5750 rpm. We put the car on a Mustang Chassis Dyno at Custom Dyno Tuning in Hayward, California. In as-delivered form our test Mustang spun the wheels to 255 horsepower at 5150 and 277 lb-ft of torque at 4300. Granted we expect about 8-10% lower numbers on a Mustang dyno than a Dynojet, our power curve did not match that of other 05 Mustang's. Examining the air-fuel ratio revealed a conservative 11.8:1 ratio up to 5100, then a drop to 10.8:1 which continues to decline to 6000 rpm. As a result of the rich tune, power suffers horribly, and where we see 05's carrying a steady horsepower from 5000 to 6000 rpm, our car drops from 255 a 5150 to 235 at 5800.
2005 Mustang GT - Manual Transmission (Ford Media Test Vehicle)
Location: Custom Dyno Tuning Hayward, CA (510)331-0608[/b]
Type: Mustang Dynomometer MD-1100[/b]
The new 05's are looking to be a huge hit amongst enthusiasts, racers and the aftermarket.
Explanation? With a build date of August 2004 we suspect our media car is one of the first 05's off the assembly line. Other publications have also indicated observing very conservative tunes on the early media cars - perhaps Ford was playing it safe until they had more run time data on the production engines. Whatever is the case, the dyno results hardly detracted from our experience with the car, and the 05's coming from the dealership seem to be holding nothing back. The dyno results we've seen show the manual GT's to be pulling hard to 6000 with air-fuel ratios in the 12.x range. With an aftermarket high-flow air intake and tune they are picking up as much as 30 horsepower to the rear-wheels. And there is more left. With Ford announcing the new SVT GT500 Cobra the furvor around the 2005 Mustang GT is just starting. Like the vintage Mustangs and Fox-body Mustangs, the new S197 platform is destined to be another huge success for enthusiasts and the aftermarket alike.
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