Questions tagged [performance]

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votes
1answer
67 views

ECU tuning exhaust - why?

When a sports exhaust is fitted to a car apparently a re-tune of the ECU is required. For a simple example consider a regular unmodified normally aspirated petrol car which then has a sports exhaust ...
38
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3answers
370k views

What does a water-like drip 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 drops from its exhaust steadily in 4-5 second intervals. I tried to ask a couple of people at the ...
3
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2answers
1k views

Any means to add more batteries to an electric car?

A lot of the electric cars available today (except Teslas) have too small ranges. Inspecting them I see a lot of trunk that I might want to relinquish in exchange for extra range. However I don't see ...
4
votes
1answer
606 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 IV ...
1
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1answer
79 views

Does the engine oil affect the top speed of each gear

I have an R15v3 with 4.5km mileage, just recently I had no choice but to use semi synthetic oil because the shop I bought the oil from gave the wrong product, now I feel that my engine "roars&...
3
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1answer
195 views

Captiva problem

My Captiva Diesel 2007 has a problem going on a distant journey. During short or town drives, it is fine. When it turns to be a long journey, the car turns off after a while. My mechanic tried a ...
1
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1answer
101 views

There's no replacement for displacement

I grew up with the saying "There's no replacement for displacement" when referring to engine size, performance, etc. Does that saying still hold true today? It's getting harder and harder to ...
1
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0answers
37 views

CB400SF Hyper Vtec Spec 3 Sluggish performance @ 5000 rpm onwards

my 2005 CB400SF is experiencing sluggish performance at 5000rpm onwards. I deemed it sluggish because the sound is not as "smooth" as before. It behaves like how a rev limiter would. Vtec ...
3
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5answers
69k 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 ...
0
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2answers
51 views

Brakes slowly locking up while driving

Hello everyone I have a 2001 Honda Civic dx that I just bought as a commuting vehicle to replace my wrangler. The only problem with it is that the brakes slowly lock as you drive it. I was told it was ...
1
vote
1answer
34 views

What kinds of tuning can ruin a car's ability to pass emissions testing?

Suppose I want to tune a car for performance, like doing an ECU re-map for a Toyota Supra. Could this affect the car's ability to pass emissions testing? If so, how? And in general, what kinds of ...
16
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5answers
72k 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 ...
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0answers
21 views

Car engine performance is sporadic

I have a 2000 Holden (Opel) Astra. The performance of it is sporadic. The driveway I live on is a hill, and a couple of days ago, reversing it seems like the engine is stalling and it requires a big ...
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0answers
35 views

How to design an exhaust pipe to increase scavenging at specific RPMs

Good day all. I'm looking for advice on an exhaust design problem. It is easy to find videos explaining exhaust scavenging, but how do you control it? Surely there must be some physics that can be ...
0
votes
1answer
62 views

Performance brakes on the front axle only. Bad idea?

Here is the back story. I have a 5yo Jeep Wrangler Unlimited Rubicon. I do a lot of long-distance driving as well as off-roading whenever possible. My vehicle is mostly stock with the exception ...
0
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1answer
296 views

Issues after installing performance headers in civic ek

I own civic ek sedan with D16Y4 engine with auto transmission. I have installed performance headers 4-2-1 after installation I faced an issue during low rpm (during heavy traffic), engine started to ...
2
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0answers
74 views

What causes a vehicle/engine to lose power over time? [closed]

Considering normal everyday use. What factors may cause a generic vehicle/engine to lose some of it's power over time? I recently did a dyno test and noticed that my torque output has decreased ...
3
votes
1answer
83 views

High Idle in Tata Manza, occasionaly

I have noticed that the diesel car idles high (1400-1600 RMP) in Idle. This is occasional and some times the engine check light comes on and goes off. scanned the system, but was not able to find ...
8
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8answers
51k 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 ...
0
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1answer
46 views

Improve performance on Golf 1.6 diesel [closed]

I have a 2011 1.6 TD golf estate.The car looks fantastic as it's has darkened windows and Audi alloys but has terrible acceleration,so can this car be chipped to improve the performance? I will even ...
11
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2answers
24k 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?
10
votes
1answer
60k 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
4
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2answers
1k views

wheel offset and effect on car geometry

I have a Subaru WRX which is about to have Brembo calipers and disks. The OEM wheels at 17x7J and 55 Offset do not clear the Brembo calipers. After spending days measuring clearance from wheel hub, ...
1
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0answers
117 views

What is the purpose of this hole in cylinder head. Thanks

What is the purpose of this hole in cylinder head bottom?I dismantled cyl.head and change a new one but when I opened the cooling water, water is coming out to this hole.Is there a possibility that ...
0
votes
3answers
620 views

Why are high performance electric cars promoted as requiring no gearbox?

Why are high performance electric cars promoted as requiring no gearbox? Moreover, why don't they have gearboxes ("a gearbox" in this context implies a gearbox with multiple selectable gear ratios)? ...
0
votes
1answer
89 views

How often and for how long a motorbike (Honda CBR 919 RR Fireblade) needs to run in order to be healthy?

I love my motorcycle but I have been thinking about coming to work by bicycle sometimes. My motorcycle is a 1998 Honda CBR 918RR Fireblade I currently use it every week day. On Mondays, after being ...
1
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0answers
28 views

Optimizing temperature and spark for horsepower

I recently completed a heads+cam project on my car to increase horsepower. I ended up falling about 50hp short of my goal, and am looking for every little knob I can turn to eek out that last little ...
2
votes
0answers
114 views

What transmission can I join to a 2JZ GTE to support 600 bhp in a Lexus IS300?

I've been researching various transmissions that are popular to connect to a built 2JZ GTE engine. It looks like a popular choice is a Magna PT V160 6-speed manual. However, I'd like to know if there ...
0
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0answers
20 views

What could be the problem with my Range Rover going off when driving? [duplicate]

What could be the problem with my Range Rover going off when driving? I need to stop and restart it over again at times it doesn't pull after restarting , I need to wait for some few minutes before ...
13
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2answers
49k 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, ...
1
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0answers
42 views

Poor performance

I have a 2005 chevy avalanche 5.3L 4wheel drive. The vehicle starts and runs good and you wouldn't think anything was wrong with it while driving. That is until you step on it. If I were to spin my ...
7
votes
8answers
46k 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 ...
0
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1answer
4k views

Water like drop coming out of the exhaust of the car stops? [duplicate]

Earlier, water like drops come out of the exhaust of my car. I searched web, and it shows that its a good sign. But for last few months after a regular maintenance cycle (Oil, Oil Filter, Air Filter, ...
0
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2answers
64 views

Is there a difference between unleaded and premium unleaded fuel?

As far as I'm aware the octane rating is the important thing so in th uk, using super unleaded(97) or v power(99 i beleive) gives the superior performance. I have seen 'unleaded' which says its 95 ...
2
votes
1answer
76 views

Does having no oil/thinner oil make an engine feel more revvy/lively?

I saw a comment which said if you run with no oil this would make a car sound and feel more revy and lively etc(though it wouldn't last very long). Is this true? Personally when I've been low on oil ...
3
votes
3answers
5k 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
3answers
1k 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 ...
0
votes
4answers
1k views

Why do most performance cars have longitudinal engines?

Why do most performance cars have a longitudinal-mounted engine? By performance cars I mean sports cars that typically develop at least 400hp and are usually coupes two seaters.
4
votes
2answers
26k 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 ...
4
votes
2answers
6k views

How to increase the lifespan of a diesel turbo?

Replacing a diesel engine's turbo costs a lot of money. How should a diesel car's owner drive, park and take care to insure that he/she gets the maximum km/miles out of his/her car's turbo?
5
votes
1answer
50k 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 ...
5
votes
5answers
114k 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 ...
1
vote
2answers
207 views

Honda Dio performance reduced after 9000km

I see a drastic performance reduction on my 2017 Honda Dio gearless scooter which has just completed 9000km. I just went back to the service center and the guy there, after riding my scooter said the ...
3
votes
2answers
328 views

760li M performance G12 overheating brakes issue

We recently got BMW 760li M performance G12. It has the M blue brakes system, see image below. When driving in extreme mode (it is for officials, almost always in rush mode) the brakes do not ...
6
votes
7answers
72k 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 ...
1
vote
1answer
797 views

Sienna lurching, loss of power

OK drove my previously functioning 2000 Sienna, it was driving fine/like normal for a minute, then it started "lurching" when I hit the gas. Felt like it was losing power or starved or something, it ...
2
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2answers
3k views

Performance Modifications for the EJ253 - Throttle Body Spacer?

I've got a 2007 Subaru Forester school-bus, with a EJ253 N/A mated to a 4EAT A/T. So I've done some mild Googling, and came across This Great Post. Deep in there is this gem: THROTTLE BODY ...
2
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5answers
5k views

Increase my cars BHP?

I have a corsa, it's very slow and sluggish. It's my first car and feel like it could do with something to give it a kick. Here's my specs any reccomendations what I can do with it?
9
votes
3answers
46k views

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 ...
3
votes
0answers
118 views

2011 Chevy Impala was inactive with dead battery for 3 months! I have tons of problems now! Help!

In late December 2017, I discovered my 2011 Impala wouldn’t start. My boyfriend and I jumped it with our other vehicle and it worked. We disconnected the cables and left it running for a while. We ...