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1d
comment Symmetric tyres with tread reversed in each side of the axle
Is there an arrow on the side wall of the tyre? If not, don't worry, else all the arrows should point forward.
2d
comment Why hasn't anyone beat the 6:11:13 Nürburgring Record set in 1983?
The radical went the extra 2km, plus its aerodynamics force it to have a lower top speed.
Apr
15
comment Can I still drive my car when one of the tires has lower pressure?
I can't give you an exact figure. If the wheel is noticeably flat, I wouldn't drive far on it.
Apr
15
revised Why hasn't anyone beat the 6:11:13 Nürburgring Record set in 1983?
added 492 characters in body
Apr
15
comment Why hasn't anyone beat the 6:11:13 Nürburgring Record set in 1983?
The Porsche 956 weighed 400kg less than the Zonda R and had a similar peak horsepower. If the zonda weighed 800kg, it would beat the record.
Apr
15
answered Why hasn't anyone beat the 6:11:13 Nürburgring Record set in 1983?
Apr
15
answered Can I still drive my car when one of the tires has lower pressure?
Apr
13
comment Is it common for ECU's to maintain individual limit maps for each knock sensor?
I was wrong. See my update.
Apr
13
revised Is it common for ECU's to maintain individual limit maps for each knock sensor?
added 319 characters in body
Apr
8
revised What does it take for a modern muscle car to sound like a classic muscle car?
added 1 character in body
Apr
7
comment my car sputters and it wont hold idle
There is usually a way to make your car "flash" the error codes for you. I don't know how your car works specifically, but in the case of my old Opel Astra, I had to turn on the ignition, then press the brake and clutch for 10 seconds, then the check engine light will start flashing a pattern which you can write down and do a google search on. I did a quick search for yours but couldn't find anything. Maybe you should give it a try yourself.
Apr
2
comment Is it common for ECU's to maintain individual limit maps for each knock sensor?
The maps DO change over time. Specifically, the short term and long term fuel trims and the FLKC, FBKC and IAM tables (I assume the tables you are looking at are the FLKC tables). The only other reason I can think of is that BMW wants to limit the amount of power you lose if a knock event occurs, so they created the ability to pull timing on just one cylinder and leave the rest alone. That means one cylinder will work at 99% and the other 7 (or is that 9?) will all still work at 100%.
Apr
2
comment Is it common for ECU's to maintain individual limit maps for each knock sensor?
They're not "static maps". They're just shared by all the cylinders. You could call them common maps. Static maps refer to Carb engines. If you take a brand new engine and do a leakdown test, you'll see the average pressure a cylinder can hold may be around 190psi, but some will hold 180psi, others will hold 195psi before leaking. Fuel injectors are much better at distributing fuel to far-off cylinders, but they can still go bad. I was just guessing as to the reason. Still, I don't think it's absolutely necessary to have a unique map per cylinder. That's a bit overkill.
Apr
1
answered Is it common for ECU's to maintain individual limit maps for each knock sensor?
Mar
31
comment my car sputters and it wont hold idle
If you have a Check Engine Light, there's an associated fault code stored in your ECU. Have that code pulled by a workshop, then take it from there. It sounds like an ignition or fuel pump problem, but it could be lots of other things too, which is why the actual error code is useful.
Mar
26
comment Changing Firing Order in a 4 Cylinder Car
Let us know how it turns out.
Mar
24
revised Changed O2 Sensor and my mileage went down
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Mar
24
comment Changed O2 Sensor and my mileage went down
You may need to have your new O2 sensor calibrated. It will require re-flashing your engine management system, so if that's going to cost more than what you expect to save from improved mileage, it may not be worth it. You can expect to pay between $200 and $600 for the exercise.
Mar
23
answered Do I need expensive tires for my Audi A4?
Mar
23
answered Changing Firing Order in a 4 Cylinder Car