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7
votes
1answer
123 views

Consequences of a Dirty Intake Manifold

This is similar to, but not the same as my question Effects of Dirty Piston Heads and Intake Valves. Basically, I often see people talking about taking the intake manifolds off older cars to clean ...
5
votes
2answers
53 views

How much horsepower to expect from a cold air intake in Dodge Ram

It's a 1999 Dodge Ram 1500 4x4, Laramie SLT, automatic transmission, 5.9l magnum engine, and crew cab (222k mi). I have a friend who could put a cold air intake on it, with a new hood. But I have ...
9
votes
1answer
48 views

How do you plan an engine build?

What must be accounted for when building an engine for performance applications? How do you methodically plan a build? Take for instance a stock Small Block Chevy. Budget I understand with an ...
4
votes
0answers
46 views

What will upgrading the Camshaft do to my BBC 454?

I have been told that upgrading the Camshaft in my GM 454 will increase performance. What will this do exactly and what will the engine actually gain? 10069286 block casting 454cu '90-'91 MY, Mark ...
6
votes
2answers
128 views

What are Performance Camshafts?

I read the following question recently: What is it about performance cams that make engines produce more power when they are installed? I know there are a few components for cars that have "cam" ...
5
votes
1answer
70 views

How to increase horsepower? [closed]

How can you increase horsepower on an engine through general modifications without modifying the internals of the engine? Are there benefits or tradeoffs from doing so? What kind of things could I ...
8
votes
1answer
498 views

What is a 6 Pack and will it add performance to my engine?

What is a 6 pack in the hotrodding world? Does it improve performance of my engine?
9
votes
1answer
69 views

How does a dynamometer work?

I don't have much to add here. Pretty simple. How does a dynamometer work? How are Horsepower and Torque measured as separate figures during a single dyno run? There are quite a few components and ...
12
votes
1answer
88 views

Dynamometer Question - How is it operated and what are they doing?

When guys are doing dyno runs they to do it in a gear, interact with the keyboard and then do it again in another gear. It seems they do multiple runs in multiple gears. In this post Paulster ...
6
votes
4answers
191 views

Cheap vs Expensive Fuels [closed]

What is the difference between the cheapest fuels in a place like Tesco's and the 'high quality', highly priced competitors? Is there actually any noticeable difference in available power, engine ...
3
votes
5answers
74 views

1980s motorcycles and engine size: still good performance?

A buddy of mine is considering a fix it upper road bike for fun and to learn (prior dirt bike rider). I still go by the rule of thumb that 600cc is iffy for beginners but a lot of used 1980s bikes are ...
3
votes
1answer
44 views

2011 Infiniti G37 - Throttle Response Issue

When I step on gas in my G37 the throttle response is a bit lagged. It has increased ever so slightly over the past 6 months. Can someone explain what the cause of this might be and any preventative ...
2
votes
2answers
74 views

Replacing Spark Plug with Laser Iridium NGK Spark Plug

I have 2012 KTM Duke 125 at 10 000 miles (16k kilometers). I am the third owner of bike for 2 years. Whenever i twist the throttle fastly, motorcycle is chocked up. So i thought the problem could be ...
2
votes
1answer
101 views

Which is better, Power to Weight Ratio or Horsepower

When looking for specifications of a car/vehicle we come across two parameter. Horse Power/Pferdestärke (PS) Power to weight Ratio So, while considering any vehicle , which one of the above ...
3
votes
2answers
221 views

Does Max Power RPM Equal Max FE?

I was looking over the specs for a 98 Mazda 626 2L and noticed that it says the max power is at 5500 RPM. Will the Max Power RPM also be the RPM at which the engine is most efficient assuming ...
4
votes
1answer
55 views

Ford TDCi 1.6: more performance in cold weather

For some time, I've had a problem with the performance of my Ford Focus 1.6 TDCi (Diesel): when accelerating hard in the 3rd or 4th gear, there was a performance drop and I sometimes had to go off the ...
3
votes
0answers
81 views

What causes an engine idle to increase briefly?

I have an old twin cylinder 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 ...
3
votes
2answers
2k views

Wheel offset effect on performance

When it comes to upgrading wheels and tires, drivers tend to have two different goals in mind: Improving their vehicle's handling/performance Improving their vehicle's appearance A lower positive ...
4
votes
0answers
251 views

Power loss in Nissan Primera SVE. Possible causes?

I have a Nissan Primera SVE (2002 model). Mileage is about 200000KM. Had its timing chain replaced at the end of 2013 because it was "stretched". Since then, I haven't had any problems (up until now). ...
3
votes
3answers
273 views

Are there any negative sides to using multiple air filters?

My question is actually quite simple. Do you get any performance/sound/feel differences while driving with multiple air filters? For example, the stock filter that's built into most engines: and an ...
2
votes
1answer
764 views

Using an open vs closed clutch cover on a motorcycle with a dry clutch

A common modification I've seen on motorcycles with a dry clutch is to replace the closed clutch cover with an open one. Besides the visual and auditory differences, will I notice anything else ...
3
votes
1answer
13k views

What are the differences between a wet motorcycle clutch and a dry motorcycle clutch?

What are the differences between a wet motorcycle clutch and a dry motorcycle clutch? More specifically, what are the differences in applications performance reliability maintenance/repair
0
votes
1answer
334 views

1999 olds alero wont acelerate over 70mph need help

I have a 1999 Oldsmobile alero 4cylinder. This is what im noticing when I put the car in drive sometimes, and press gas the car doesn't want to go it hesitate even when im pressing gas a n d then I ...
0
votes
1answer
67 views

Dodge Neon SRT-4

My SRT-4 is putting out the proper boost and pulling vacuum, but it's not pulling the right amount. When I bought the car in 2008 it was pulling about 20hg, but it sat for three years and now it is ...
22
votes
3answers
96k views

What does a water-like drop coming out of the exhaust of the car signify?

Sometimes while driving in the traffic, I come across a car or two which would be dripping water-like drop from it's exhaust steadily in a break of 4-5 seconds. I tried to ask a couple of people at ...
5
votes
4answers
3k views

What could be the reason and solution to a sudden drop in mileage?

Got my Suzuki Swift Diesel serviced two months back, and all of a sudden the mileage dropped from 20kmpl to 12kmpl and that is confusing! After i returned to Service shop, the guy said that there is ...
-1
votes
2answers
435 views

The disadvantages of mitsubishi lancer 2007 [duplicate]

I am planing to buy a new car that has to be good enough to be used everyday . I have tried the speranza and the brilliance but weren't good and not reliable to be used everyday . Many friends ...
3
votes
1answer
14k views

How much does displacement affect performance?

I'm interested in learning more about the steps that can be taken to increase the performance of an engine. I'm curious how much displacement affects performance. For example, compare the following ...
7
votes
5answers
129k views

What is the meaning of BHP and torque in bikes or cars?

BHP = Brake horse power. It says that it is brake horse power but it is generally relates with high pick up (your bikes reaches top speed in lesser time). So what does this actually mean?. Torque = ...
5
votes
4answers
14k views

Random RPM jump when accelerating hard

I should state first off that I'm not much of a car guy when it comes to the actual mechanics behind them. I just wanted to check if there's anything going wrong with my transmission. I drive a 03 ...
7
votes
4answers
379 views

Assuming identical and sufficient ABS, and ignoring aerodynamics, are tires the only factor for braking distance?

I had my first accident two days ago (minimal injuries so don't worry about that), and it's got me thinking about a lot of different aspects to driving and cars, such as braking. Had my braking been ...
5
votes
3answers
82 views

What is a good strategy for adding performance upgrades in phases to a 2013 Mazda 3?

I have a 2012 Mazda3 s (manual transmission, base engine) to which I'd like to begin adding more performance-oriented parts once the OEM parts begin to degrade. However, I am not the kind of person ...
1
vote
1answer
196 views

Diagnose lag in acceleration

Honda Accord 2003 V6 - I've recently noticed that there's a slight lag from when I depress the gas pedal to feeling the car accelerate. What could be the cause? I the mornings when I start the car I ...
0
votes
1answer
42 views

Does the advantage of ballast make minimum weight rule pointless? [closed]

Rules pertaining to the minimum weight of cars in motorsport (600+ kg in F1) were introduced to prevent manufacturers from producing dangerous designs for the sake of being lightweight. However, we do ...
7
votes
3answers
34k views

Differences and Recommendation between Steel and Alloy Wheels for Winter?

There are many discussions regarding steel vs. alloy wheels in Winter on multiple forums. It would be good if someone could lay out full facts and help scale these differences (questions below). For ...
2
votes
1answer
2k views

What (if anything) does the Sport button on a Mini Cooper do?

There is a button next to the stick shift labelled Sport. It feels like it just re-maps the throttle so the pedal is more sensitive, but does it really change anything about the performance, ...
2
votes
2answers
391 views

Advice on buying a new car (Ford Focus Zetec 1.6 vs. Subaru Impreza 1.5R)

This question is probably somewhat subjective as all cars are slightly different. I am currently in the process of looking for a new car. I'm currently driving a Vauxhall Astra 1.8 SRi (mk-5, 5 door ...
2
votes
3answers
89 views

Alternate fuel for motor cyce

In some countries, Government mixes ethanol with petrol & diesel and distributes it to their consumers. This will save some of their imports. My question is Can I blend petrol with Zatropha ...
8
votes
2answers
394 views

Performance Exhaust — what, how, why?

I've seen performance exhaust pipes on sale for cars and motorcycles, and my questions are these: What does it do? (better performance [and how so?]? better mileage? cooler sounds?) Is/how is it ...
2
votes
2answers
2k views

Seat Leon FR TDi 170 injector recall - affected cars

I am looking at purchasing a 58 plate (late 2008) Seat Leon FR TDi 170. I am aware of the injector recall, however I would like to know for how long the problematic injectors were a problem for? The ...
3
votes
1answer
365 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 ...
2
votes
2answers
8k 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 no check-engine-light (CEL) or codes. One month ago an independent garage looked at it and did $2200 of work including transmission ...
-2
votes
2answers
104 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
4answers
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
36k 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
128 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
40k 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 ...
12
votes
4answers
46k 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 ...
9
votes
2answers
12k 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, ...