Questions tagged [performance]

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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 ...
4
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0answers
910 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). ...
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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 ...
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 ...
3
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0answers
101 views

How to adjust power for 1st & 2nd gear in classic 350?

i am facing loss of power with 1st & 2nd gear while accelerating after changing gears. As soon as RPM goes high the power becomes stable. I want to know that which type of setting should be done ...
2
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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 ...
2
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0answers
225 views

1992 Ford F-250 4x4 5.8l 408ci stroker tuning questions

I have a 1992 Ford F-250 4x4 w/a 5.8l blocked 408ci stroker attached to a ZF 5 speed tranny running 3.55 gears. On the engine sits a set of 64cc chambered, 190cc intake runner, 70cc exhaust runner, 2....
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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 ...
1
vote
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&...
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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 ...
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 ...
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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 ...
0
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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 ...
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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
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0answers
36 views

Polishing internals?

How should I polish the internals of an engine to create a smooth and carbon free surface? I am just wanting to polish the internals with little to negligible amounts of metal being removed. I was ...