Search the Community
Showing results for tags 'modifications'.
Found 4 results
Sadik posted a question in Mechanical problemsGents, i was able to get a GLS full rear wheel cover and garnish of a damaged Pajero (V98) from Japan and want to fit it to my 2014 GLX Montero. Can anyone recommend me a good mechanic to do the replacement with painting. Thanks S
I have a Nissan March K10 2-door car,can some one tell me some modifications that i can do on it,specifically at home. I have another question,recently i put up new Vipers on to it,But i Think now the vipers are somewhat slow,before putting new pair also i noticed that.What could it be? Thank You
Hi All, I would like to discuss on the topic "converting vehicle transmission from manual to automatic". Idea of this is mainly because, nowadays most of the manual transmission cars are lot cheaper than the auto. So if anybody is willing to buy a manual for a cheaper price and convert it to a auto he will find a price advantage?? If we can discuss the pros and cons of the transformation, good mechanics who have done it successfully and hands on experiences; it would be interesting!!! What do you say??
The main aim in creating this thread is to educate people about performance modifications and to share the knowledge regarding them. And also to build a more performance oriented car community rather than one based on fiberglass and huge spoilers Why do modifications? It's done in order to improve things in various departments of a vehicle such as handling,looks,speed,braking etc. A modification can make or break a car,so it's important to choose them wisely. What to start with? It depends on ones preference and what one really wants from his or her vehicle. If it's just the looks a good body kit and a set of alloys would be more than enough to satisfy ones need.But if you are more of a petrol head and into performance one might take the performance path. Performance path is for those who like to feel,hear the difference and not just see it. In my opinion its the best path to take because you can enjoy it at the end of the day. Where to start? It depends on the vehicle one would select for modifications. To make things better the weaknesses should be treated first."Power is nothing without handling" but to start with handling one should know what the final product would be and what figures he is looking for, so for someone who hasn't got an idea about it, starting with engine modifications would be the wiser thing. But for someone who would feel that stock power is enough the brakes and handling is the way to go. Engine Modifications The extent of the modifications depend on what one is hoping to achieve and the amount of cash allocated. Then one would have to choose whether he is going in the NA route or the Forced Induction route.But if it's someone whose wanting to get more power from an everyday car whilst keeping its drivability and practicality it's better to go in the NA route. Some of you'll might disagree but its cheaper when compared to forced induction. The power of an engine is mostly based on air,fueling and ignition,so in order to improve things these departments need improvements. So lets see what could be done. Intake The intake provides oxygen for the combustion of fuel in the cylinder. Therefore more oxygen leads to complete combustion which leads to more power. Colder air contains more oxygen, one might have realized slightly improved throttle response during a cold day or in a cold area like Nuwara eliya. The EFi engines consist of various sensors located in the intake route in order to measure the flow,Oxygen percentage,Intake temperature etc. The values obtained by these will lead to the performance of the engine. If we could decrease the intake temperature more fuel would be added to the cylinder due to the more oxygen present in the air resulting in more power and vise versa. In order to do this most performance engines come with a cold air intake which manages to keep the intake temperature down most of the time Cold Air Intake (CAI) and performance filters Cold air intake is one which is directed in a manner which sucks in air which is cooler than the air inside the engine bay. Normally these intakes are routed through the front bumper or else below the engine bay. These systems have proved to improve the gains but has their down sides. The increase in pipe length will decrease the throttle response slightly and there are chances of water going into the system due to floods etc. If one has a well ventilated engine bay (preferably one with a large front grille) a performance filter will improve the power slightly. A performance filter is one which has better flow than the stock filter whilst filtering the dust and particles. But most of the time the filtration suffers. So one should consider the filtering property too when choosing a performance filter because it would have adverse effects on engine life specially in a country like ours. Cone intake vs Stock replacement performance filter The cone intake would let in more air leading to a slight power gain and also will produce the induction noise which some prefer. The gains will be mostly in the high rpm range and the low end gain would depend on the car and sometimes might be negligible. Also when fixing a cone intake it should be fitted in a place where it could draw in cool air sometimes placing in the stock location of the air box might lead to a drop in power once the engine heats up due to hot air being drawn in. For better performance a heat shield could be used to prevent it from drawing in heated air. The stock replacement performance filter would improve the low end mostly and is not fancy as a cone intake. It doesn't alter the induction noise either yet quite practical for a daily driven car. The gains from these modifications depends on a lot of factors such as the displacement of the engine,compression,flow rates etc. The gain in figures would be anywhere between 2-5bhp (*subjective) Throttle body and intake manifold modifications Increasing the diameter of the throttle body will lead to a gain in some engines while it would kill the low end in some others. The ones running high compression would gain from this cause of the increased amount of air fed into the engine yet it might lead to a drop in air velocities in the ones with normal compression. Throttle body polishing would increase the air velocity which would lead to a slightly better throttle response. Bigger intake manifolds will make a difference in a high compression NA engine or one which is having forced induction but will not be ideal to be used one cars with normal compression ratios. Exhaust The Exhaust system consist of many parts namely the Exhaust manifold,down pipe, catalytic converter,muffler. Exhaust Modifications Before doing an exhaust modification one should know what he wants from it. If it's just the sound a free flow muffler a.k.a Beat barell would do. But if it's performance one would have to modify the components of the exhaust. The exhaust system is based on the backpressure which is needed to some extent for a daily driven car but too much of it will hinder the performance. So the the extent of the modification depends on which rev band power is needed. If one wants to squeeze a bit of power with a tight budget a Cat back system would be ideal. Cat back exhaust It is a system consisting of piping with larger diameter and a performance muffler. But the changes are done after the catalytic converter. This would lead to a better mid and high end whilst keeping the stock low end power. But when choosing the pipe diameter bigger isn't always better. Therefore the piping with the correct diameter should be selected. Exhaust manifold (Headers) These would be changed according to the gain expected. If its a turbo conversion these would definitely need changing. The pipe diameter depends on the application its being used on but they have a gain over the stock manifold which sometimes reduces the velocity of the exhaust gas due to its size and construction. So for someone looking for more power the headers would be a good option. But they should be fabricated by professionals and also it's better to use thermal insulation to keep the engine bay temperature low. Muffler The muffler is used to muffle the sound of the exhaust. The choice depends on the owners preference but most of the time a proper performance muffler which is made by a reputed company sounds better than a Beat barell which is made in Sri Lanka. The free flow is said to reduce the back pressure slightly but the gain in negligible in some cases. The sound it makes depends on the size of the internal pipe of the muffler, The amount of glass wool, the size of the tip etc. A small muffler on a large engine will make is sound real bad while the other way around will hinder the performance of a small engine. There are two types of exhaust setups that could be used in a conventional 4 cylinder engine. First one is known as a 4-1 and the other is known as 4-2-1 4-1 Exhaust Here the 4 pipes on the exhaust manifold is fitted to one exhaust pipe which is known as the down pipe. The gains of this kind of system is mostly on the mid and top end. It is an ideal set up for racing because the engine is running in the high rev range most of the time. 4-2-1 exhaust Here two pipes from the exhaust manifold is joined to a single pipe. This setup improves the mid and low end gain and most suited for street use. Please feel free to share your views regarding these and to correct me if I'm wrong. More information to be posted soon Drive Safe