WA_R32

yeah

yeah i thought it was a bit strange myself but i now also understand

this is what he meant Cams won't destroy the bottom end of the engine, they will destroy the low end power. Its fairly complicated how it occurs. But basically a high lift camshaft will allow air a larger gap for air to get into the engine. This means that the velocity of the air entering the engine will be lower. If the velocity becomes too low, it reduces the turbulence of the airstream and the atomised fuel begins to condense into droplets. These droplets will lead to poor combustion as liquids don't burn. During combustion these fuel droplets are evaporated by the heat of combustion, all of the energy that goes into evaporating these droplets is no longer available for pushing the piston down. This is also why your fuel economy will get worse, as more fuel will need to be injected to get the same amount of easily ignited atomised fuel. However the aspect of a lumpy cam that has the greatest effect on low end power is the duration (how long the valves are held open for). There are a number of factors that cause this, but the easiest to explain, and probably the biggest contributor to a loss of low end power is the fact that a long duration camshaft will hold the inlet valve open longer. A long duration camshaft will hold the inlet valve open a considerable amount of time after bottom dead centre. At high rpm the inlet gasses are moving so fast that they have a considerable amount of momentum. Holding the inlet valve open past BDC takes advantage of this momentum allowing more air into the engine (air continues to flow into the engine even fter the piston has begun to travel upwards). However at low rpm the air has much less momentum, and consequently some air can actually be forced back out of the engine before the valve is shut. A similar thing occurs in the exhaust, except that the exhaust gasses are let out too early. There is also the possibility of inlet gasses being sucked out the exhaust during the valve overlap period. not confussing at all

sorry guys i was going to do this myself so i asked my mate who is a mechanical engineer and has been working on engines his whole life and he advised me against it as he thinks they can eventually destroy the motor EDIT sorry guys miss i miss understood what he said, he said that it will destroy bottom end power not the bottom end whoops

+1 to doing it yourself you will save heaps of money

i wouldn't bother with doing poncams it will eventually destroy your bottom end they are good for power but only if you are looking for big numbers and require taking the engine apart, also dont bother getting 1000cc injectors again only needed for big power aplications 250rwkw is a big number and very streetable and you would only need 550cc injectors for that and they sell for about 600 a set. Have a look in the traders section for mechanical parts (dont buy them second hand your asking for trouble) and you should be able to pick up a profec b and power fc from someone pretty cheap just look around My 2 cents

bit strange though spending 800 on a car when you are about to sell it hey chi have you had a go at the scratch yet or you waiting till the weekend?

still here

just dont crash

they usually charge about $170-$180 per hour on the dyno but depends where you go

i thought they were only illegal for cars newer than 1995 i remember reading a post on it somewhere maybe try searching for it

if water gets into the coils it makess the car run funny (earths the coil) causes a wierd misfire, happened to my mates corolla when he got it back from th epanel beaters they had left t in the rain with the bonnet up sounded quite nice on a corolla mind you

hey also andrew if you wanted to do it yourself or not have to pay a garage to do it my housemate and i would do it for a small fee (only because timing belts are time consuming to change) we live just around the corner of where you saw us the other day. Send me a PM if your interested

yeah will do im living a lot closer now to your place so makes it easy

mate your best bet would be to ring around a few workshops and see how much they charge

cheers will try it out tonight

Hey, i just installed my profec b on the weekend and am having trouble tuning it. I had a look in the performance section to see if anyone knows how to tune these but couldn't find an answer so is there anyone that would be able to give me a hand tuning it, i have sort of tuned it and got my desired boost pressure but the problem is that it now feels really laggy compared to my manual boost controller. Any help would be great

Pm replied

hey mate, I wouldn't go running your car at 12 psi without a bigger intercooler otherwise you could get engine knock which is bad also would suggest getting an aftermarket boost guage as that way you can monitor the boost better than the stock one. Running the car at about 10 psi should be fine and not cause any damage to the engine. The bov should just bolt up where the stock one goes but not knowing too much about rb25s i wouldn't be able to tell you. If wou need a hand with anything send me a pm and i can help you out Matt

use the search function i remember a thread listing all the paint codes on it probably in the styling mods section

This is why they need to keep raising revenue they keep on loosing equipment were you travelling north or south might go see if the light is still there

Price dropped again

Bring to the top

hey mate i have a friend in the silviawa club i will get him to ask around for you and see if he knows anything, D#%kheads like that always want to brag about what they have done so you should be able to catch them

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