Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [tuning]

Referring to the act of calibrating the Engine Control Unit (ECU) or Powertrain Control Unit (PCU). This is done for better performance, gas mileage, or to allow the components of the vehicle to run better after modification.

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How to begin learning engine tuning?

Quite simply, I want to begin tuning and modifying automotive engines for hobby. I have always been fascinated with cars, and I want to become knowledgeable in as many aspects of car tuning as possible. In particular, I want to learn the right way.…
Mr. Shickadance
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How do these similar engines differ so much in power output?

I have a question that is bugging me for a long time. I will take a BMW E46 (3-Series) as an example so that it's easier to ask. Comparing M3 and E46 330 engines: S54B32 and M54B30, they are both petrol inline six engines where the M3 engine has a…
Max Urbanowicz
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What is the benefit of Forged Internals in an engine? Pistons, etc

I've heard of these for years and not fully understood the benefits, can someone elaborate? Frequently the vehicles with forged internals have serious boost pressures, but I've also heard of naturally aspirated and / or carbureted engines that have…
voxobscuro
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Why do modern PCMs prefer MAP over MAF

Why do modern PCMs prefer to use pressure sensors to estimate the air charge going into an engine instead of air flow meters. Eg they typically use a MAP sensor and complex software to estimate air charge based on current cam positions when a simple…
rollsch
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Please help with my Intake for Opel Corsa 2014

I have an Opel Corsa D 1.4 turbo. I have bought a Conic Air Filter, but I need to know what I can do to make a better installation. I don't think that I have a good one, because is too close to the warm air from the engine. To install it, I remove…
Pablo Entrala
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What causes an engine idle to increase briefly?

I have an 82 Honda 450 Nighthawk motorcycle that I'm rebuilding and I need to tune/balance the carbs. I have them bench-balanced and reset the idle screw on both. Now it runs a lot better, but every 10-15 seconds the idle raises and it starts…
Eric Fossum
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Rebuild for longevity

So, I have a question about a 98 2.0 rt neon. I am going to get a top/bottom rebuild on it, the block has 260000 km on it. I have seen rebuild kits on the market anywhere from 300 dollars (ebay specials) to just under 3000 dollars (modern…
TheRamRodder
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Do automakers ECU-tune their motors to make new models and versions?

I am considering ECU tuning my car (landcruiser 150 2.8 D4D) and have been reading about the issue. Someone told me that automakers frequently use the same motor across models and versions, yet it ends up having different power. This seems to…
user1721135
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How can a car be tuned for low/mid/high end torque?

When someone mentions tuning the car for low end torque, do they mean changing something mechanical (gear ratios/final drive) or something that has to do with the ECU ? if so what is done exactly to tune for low, high or mid end torque? I don't…
method
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How inaccurate is the stock wideband 02 sensor in the SG9 Subaru Forester XT at WOT

As the title suggests, I'm trying to get concrete data on how inaccurate the stock wideband O2 sensor is in the Subaru Forester XT (MY06 to MY08). I am attempting to create a custom map for the car and was cautioned by a Subaru expert that the stock…
Captain Kenpachi
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Tuning cars from the 90's and prior

Introduction (for those who dont care): Hi. I'm currently developing a drag racing game in the style of the beloved Street Rod and I'm kinda new to cars in general. Im reading about tuning as is the main focus of the game but almost everything i…
Jh62
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Is there a viable option for updating OBD-I to OBD-II in order to increase possibility of engine tuning?

I've been told this is a terrible idea and just wanted greater confidence even though the warning against has been taken. I want to be able to fine tune a 1990 car with an OBD-I port in addition to adding features such as launch control.…
Adrian Stubbs
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Reprogramming a Magneti Marelli Microplex MED604C

I'm interested in reprogramming a Magneti Marelli Microplex MED604C ECU for the ignition of an uno turbo, but I can't seem to find any documentation on this? I'm new to ECU remapping, and my understanding is that all the resources available relate…
javawocky
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MAF Clamping & Tuning

I am planning on making my normally aspirated engine into a boosted Supercharged Engine using the AEM F/IC 6. From many searches and forum posts I've heard I need to do MAF (Mass Airflow Sensor) Clamping, I don't mind doing it however, I was to…
1NAR
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Vacuum never decreases while leaning out carburetor mixture

I have a Rochester Quadrajet 4MV carburetor that has 2 mixture adjustment pins in the front of the carb. As I understand it, you tune these by continually tightening the mixture screws while watching a vacuum gauge. The vacuum will increase…
Ryan Griffith
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