more power
07 March 2008, 08:20 AM
#2
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Ive run turbo's and non turbo'd cars for a long time in Street Strip and have worked for MSD for years, with Hyundai rally cars and renault touring cars. Did a bit of vauxhall stuff too.
If you have a NA car (natural aspiration) you can throw ££££ at it in chips induction exhaust and get **** all of nothing!
Firstly unless you buy a head with BIG valves, ported and flowed, then an Induction kit is going to do nothing. DONT beleieve the 10bhp gains they spout!
If you make the exhaust bigger you reduce back pressure, and in doing so you ruin the pressure at the engine, therefore you loose power. (try blowing hard through a straw, now blow hard through a bit of drainpipe. Youll run out of breath and theres no pressure with a drainpipe!!!)
Chips and upgrades and FPR products wont do anything either. You are again limited by the amount of air the engine can DRAW in, you can make the intake as big as you like but 2000ccs will drag 2000ccs IN!! even if you raise the CFM level its making 1 or 2 bhp. you wont feel that and will have lost it in other areas.
If you want to make your car make more power without a turbo, you need a few other mods that are going to be costly.
First, you need to make sure the bottom end will handle whatever you do further down the line.
get the crank balanced. this helps i promise you! next have the heads skimmed down to the maximum you can do with the valves-piston gap.
This raisies the compression. get the valves made out as big as you get, or at the very least port the valve ports. DO NOT POLISH THE PORTS!!!! It hurts the engines performance!
Next dish the tops of the pistons slightly or buy pocketed pistons. This is so the burn is centered in the middle portion of the cylinder. Make sure you use good quality rings, and even have a rebore if necessary. Youll only get blow by otherwise.
Now use high tensile bolts and high pressure head gasket and bolt the thing together, use no more than a 2 inch pipe, with at least one decent muffler box, unless youre only racing then ditch this.
Get the car mapped and you might be able to add 50 horses. All depends on what youre doing.
Now theres also nitrous but its costly in the long run and you wont get greqt gains from it.
So now you see, go buy a turbo as its cheaper, easier and less hassle. and youll always be able to make more improvements with a turbo.
If you threw the money you would spend on the above build at a standard turbo, you could reach over 500bhp in the old cossies easily, in a subaru im sure you could make it up there towards 400 odd. Ask the people here what a well-modded scoob will make.
Hope that helps!
07 March 2008, 09:44 AM
#4
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Just want to add my two pennies here.
Ive run turbo's and non turbo'd cars for a long time in Street Strip and have worked for MSD for years, with Hyundai rally cars and renault touring cars. Did a bit of vauxhall stuff too.
If you have a NA car (natural aspiration) you can throw ££££ at it in chips induction exhaust and get **** all of nothing!
Firstly unless you buy a head with BIG valves, ported and flowed, then an Induction kit is going to do nothing. DONT beleieve the 10bhp gains they spout!
If you make the exhaust bigger you reduce back pressure, and in doing so you ruin the pressure at the engine, therefore you loose power. (try blowing hard through a straw, now blow hard through a bit of drainpipe. Youll run out of breath and theres no pressure with a drainpipe!!!)
Chips and upgrades and FPR products wont do anything either. You are again limited by the amount of air the engine can DRAW in, you can make the intake as big as you like but 2000ccs will drag 2000ccs IN!! even if you raise the CFM level its making 1 or 2 bhp. you wont feel that and will have lost it in other areas.
If you want to make your car make more power without a turbo, you need a few other mods that are going to be costly.
First, you need to make sure the bottom end will handle whatever you do further down the line.
get the crank balanced. this helps i promise you! next have the heads skimmed down to the maximum you can do with the valves-piston gap.
This raisies the compression. get the valves made out as big as you get, or at the very least port the valve ports. DO NOT POLISH THE PORTS!!!! It hurts the engines performance!
Next dish the tops of the pistons slightly or buy pocketed pistons. This is so the burn is centered in the middle portion of the cylinder. Make sure you use good quality rings, and even have a rebore if necessary. Youll only get blow by otherwise.
Now use high tensile bolts and high pressure head gasket and bolt the thing together, use no more than a 2 inch pipe, with at least one decent muffler box, unless youre only racing then ditch this.
Get the car mapped and you might be able to add 50 horses. All depends on what youre doing.
Now theres also nitrous but its costly in the long run and you wont get greqt gains from it.
So now you see, go buy a turbo as its cheaper, easier and less hassle. and youll always be able to make more improvements with a turbo.
If you threw the money you would spend on the above build at a standard turbo, you could reach over 500bhp in the old cossies easily, in a subaru im sure you could make it up there towards 400 odd. Ask the people here what a well-modded scoob will make.
Hope that helps!
Ive run turbo's and non turbo'd cars for a long time in Street Strip and have worked for MSD for years, with Hyundai rally cars and renault touring cars. Did a bit of vauxhall stuff too.
If you have a NA car (natural aspiration) you can throw ££££ at it in chips induction exhaust and get **** all of nothing!
Firstly unless you buy a head with BIG valves, ported and flowed, then an Induction kit is going to do nothing. DONT beleieve the 10bhp gains they spout!
If you make the exhaust bigger you reduce back pressure, and in doing so you ruin the pressure at the engine, therefore you loose power. (try blowing hard through a straw, now blow hard through a bit of drainpipe. Youll run out of breath and theres no pressure with a drainpipe!!!)
Chips and upgrades and FPR products wont do anything either. You are again limited by the amount of air the engine can DRAW in, you can make the intake as big as you like but 2000ccs will drag 2000ccs IN!! even if you raise the CFM level its making 1 or 2 bhp. you wont feel that and will have lost it in other areas.
If you want to make your car make more power without a turbo, you need a few other mods that are going to be costly.
First, you need to make sure the bottom end will handle whatever you do further down the line.
get the crank balanced. this helps i promise you! next have the heads skimmed down to the maximum you can do with the valves-piston gap.
This raisies the compression. get the valves made out as big as you get, or at the very least port the valve ports. DO NOT POLISH THE PORTS!!!! It hurts the engines performance!
Next dish the tops of the pistons slightly or buy pocketed pistons. This is so the burn is centered in the middle portion of the cylinder. Make sure you use good quality rings, and even have a rebore if necessary. Youll only get blow by otherwise.
Now use high tensile bolts and high pressure head gasket and bolt the thing together, use no more than a 2 inch pipe, with at least one decent muffler box, unless youre only racing then ditch this.
Get the car mapped and you might be able to add 50 horses. All depends on what youre doing.
Now theres also nitrous but its costly in the long run and you wont get greqt gains from it.
So now you see, go buy a turbo as its cheaper, easier and less hassle. and youll always be able to make more improvements with a turbo.
If you threw the money you would spend on the above build at a standard turbo, you could reach over 500bhp in the old cossies easily, in a subaru im sure you could make it up there towards 400 odd. Ask the people here what a well-modded scoob will make.
Hope that helps!
09 March 2008, 10:34 PM
#5
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No worries!
Just hate seeing people waste good money on GO FASTER products sold by halfords or carnoiseur, and the like with claims of 20 hp from a filter or a chip.
The money you just saved on all that crap will buy you the Turbo later!!!
THEN come back and ask the same question, just because you have a turbo doesnt mean you can buy the same bolt on **** and wizz off down the road!!!
Theres loads of people here that have tried and failed and tried and gained, its experience they gained!!! THAT IS INVALUABLE!!
The people here have all tried 99.9% of the stuff out there and will give you honest advice on what works and what doesnt. The spotty *** salesman in the go faster shop doesnt normally know one end of a con rod to the other!!!
Always ask loads of questions, get loads of opinions and see what comes out..
Hey Saxx, thanks man! Worked hard and made many mistakes along the way, dont claim to know everything, but do have a track record that shows at least some idea!!
Just hate seeing people waste good money on GO FASTER products sold by halfords or carnoiseur, and the like with claims of 20 hp from a filter or a chip.
The money you just saved on all that crap will buy you the Turbo later!!!
THEN come back and ask the same question, just because you have a turbo doesnt mean you can buy the same bolt on **** and wizz off down the road!!!
Theres loads of people here that have tried and failed and tried and gained, its experience they gained!!! THAT IS INVALUABLE!!
The people here have all tried 99.9% of the stuff out there and will give you honest advice on what works and what doesnt. The spotty *** salesman in the go faster shop doesnt normally know one end of a con rod to the other!!!
Always ask loads of questions, get loads of opinions and see what comes out..
Hey Saxx, thanks man! Worked hard and made many mistakes along the way, dont claim to know everything, but do have a track record that shows at least some idea!!
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