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4
votes
1answer
395 views

How much longer than a copper plug will an iridium plug last (on average)?

I've been hearing a lot about iridium spark plugs lately. I have read claims that these plugs are more durable than copper plugs due to iridiums high melting point and anti-corrosive properties, but ...
4
votes
2answers
10k views

Audi A4 2007 2.0T boosts but poor performance, fuel economy

My 80,000 mile 2.0TFSI Turbo Audi has lost a lot of performance but produces no check-engine-light (CEL) or codes. One month ago an independent garage looked at it and did $2200 of work including ...
-2
votes
2answers
113 views

how to compute performance of clutch [closed]

I have this idea: attaching electric motor to clutch and then to a generator then computing when for example we 1kw give the motor how much generator will take back? now we have performance of ...
1
vote
1answer
69 views

v-tech now vs then

Back around 2003-2006 I looked into V-Tech which was using a variable cam lobe with a more agressive profile that engaged when "needed". Today, we have motors with a continuously variable valve timing ...
3
votes
5answers
4k views

Why does my automatic 2002 Honda Accord EX V6 seem to struggle when shifting gears?

It's happening more and more these days where I will hit the gas while at a complete stop. My car starts moving, but not as fast as it should based on how far I have the pedal down. Anymore, I can ...
5
votes
6answers
41k views

Racing Fuel (100 Octane Rating) - Better than Premium?

Earlier today while driving out East on Long Island I stopped to fill my tank with gas, and at the station, all the pumps had the usual Regular, Mid, Premium on one pump, but on the 2nd pump which ...
2
votes
3answers
132 views

Jet performance chips & mfgr warranties

I was toying with the idea of getting a bit extra from my 2011 Chevy Cruze Eco. It's a great car but I think the turbo is being control via the computer and in my opinion, could be a bit better. I was ...
4
votes
3answers
48k views

What is ECT Mode for? - Toyota Cars?

I'm not sure if this is a feature on Toyota cars alone, but I currently drive a '99 Avalon XLS and in addition to the D3 mode which I know disables overdrive, right above the radio near the top of ...
13
votes
4answers
53k views

What would be the most likely cause of engine sputter?

Most of the time my 2001 Honda Civic sounds like this... Vrooooooom. But some times when I start driving it sounds like this... Vrooom putt pa putt pa putt pa vrooooom. When it's in the "putt pa putt"...
11
votes
2answers
15k views

How much power (HP) do the components on the engine belt generally use?

In general, how much power (HP) to the components on the the engine belt actually use? I'm trying to come up with an estimate of how much horsepower an engine wastes on things like the AC compressor, ...
7
votes
5answers
17k views

How to extend the life of the dual mass flywheel in a diesel engine?

I am looking for ways to improve the life of the dual mass flywheel (DMF) in my 2005 Ford Focus tdci. I have heard that they can wear out quite quickly on the Ford Focus if they are driven in city ...
17
votes
3answers
20k views

Why is my motorcycle losing power when accelerating?

I ride a Honda Rebel 250 motorcycle and over the past few days I find that the bike is losing power when accelerating fast. When I twist the throttle to accelerate quickly (in any gear) I hear the ...
12
votes
3answers
9k views

Is high octane fuel a requirement for high-compression engines?

I own and use a 2005 Chrysler Crossfire SRT-6 as my daily commuter vehicle. I'm not interested in trying to eek out a few extra miles on a tank, I want to keep the vehicle and its engine running as ...
25
votes
3answers
7k views

Static vs. Effective compression: Why does higher effective compression not require higher octane gas?

Background I've been trying to do a lot of research on boost lately because I'm planning on running a moderate turbo setup on my daily/light-duty-autox car in the future. I'm trying to get into the ...
2
votes
2answers
2k views

Should I get a reusable/washable air filter for my Kia Soul?

I've got a 2010 Kia Soul, and I was wondering if I should get a reusable/washable air filter, such as the K&N 33-2960. The reasons I would think to get such an air filter would be: Save on the ...
12
votes
4answers
2k views

How to troubleshoot excessive timing retard?

I've seen numerous cars that for one reason or another, retard timing excessively at wide open throttle - getting worse over time. Seat of the pants impression is that power drops off steeply as RPMs ...