The Tibby Its Done... 2 Years In The Making..
Senior Member
Joined: Mar 2006
Posts: 7,799
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Vehicle: 2001 Hyundai Tiburon
Awesome, that what I figured for the Trans cooler. About time you let us in on some good info. Im going to check on having my stock rail bored to. My dad should be able to do it at the machine shop at his work. Looks amazing man. Let us know when you got some updated numbers for us!
Thread Starter
Senior Member
Joined: Aug 2004
Posts: 2,764
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From: South Korea where u car from fool
Vehicle: 2008/Hyundai/Tiburon gt
hyundai Paint code XA Marble gray.. it was painted with dupont paint. and its the santa fe colour.. I feel so bad i have not washed or waxed my car for a year now and its been on jack stand for a year now..
well this set up i got after looking at the tunning cars in japan..they do some wild ass shit there..one big pump has its good points and its bad. if you look at the one big pump set ups most of them have a surge tank. and most big pumps cant self prime " or that is what i have been told"
the surge tank also help with fuel starvation on accleration and connering or any fancy foot work for that matter.. also it keep a conset uninterupted suppy of fuel even under full boost.. hens no KA-Boom.. from going lean..
Reading time:
Fuel Pumps
Uprated fuel pumps are usually essential at some point when modifying an engine. There will always be some latitude in the the original pumps supply capacity, the danger is going beyond this, especially with a turbo charged engine. A high speed lean condition could result in melted pistons!
In order to calculate whether your pump is up to the current or planned horsepower output use the following formula:
Fuel Flow (cc min) = HP x K
K = 5.6 for forced induction and 4.6 for Naturally Aspirated engines
You might like to work the other way round and see how much power your pump can deliver. If you had a 130hp N.A engine and you wanted 180 hp and you know the pump delivers 644cc a minute what power would the pump supply.
Fuel Flow / K = HP so for N.A engine this pump will deliver 140 hp.
In this example you need to increase the pump flow to more than 828cc minute. In reality most pumps are rated well above the actual output of the engine in order to ensure the fuel injection system works correctly. If the pump is up to the job your next job is to check the injectors are. Divide the flow required at the estimated horsepower output by the number of injectors to get the required injector flow. Remember that you need to have an injector at least 15-20% higher flow than this. This is because to operate reliably injectors should only operate on around 85% duty cycle. So for our engine we want 180 hp from we need an injector of = 180hp x 4.6 = 828cc divide by 4 (4 injectors) = 207cc minute plus 20% allowance for duty cycle = 248 cc min.
well this set up i got after looking at the tunning cars in japan..they do some wild ass shit there..one big pump has its good points and its bad. if you look at the one big pump set ups most of them have a surge tank. and most big pumps cant self prime " or that is what i have been told"
the surge tank also help with fuel starvation on accleration and connering or any fancy foot work for that matter.. also it keep a conset uninterupted suppy of fuel even under full boost.. hens no KA-Boom.. from going lean..
Reading time:
Fuel Pumps
Uprated fuel pumps are usually essential at some point when modifying an engine. There will always be some latitude in the the original pumps supply capacity, the danger is going beyond this, especially with a turbo charged engine. A high speed lean condition could result in melted pistons!
In order to calculate whether your pump is up to the current or planned horsepower output use the following formula:
Fuel Flow (cc min) = HP x K
K = 5.6 for forced induction and 4.6 for Naturally Aspirated engines
You might like to work the other way round and see how much power your pump can deliver. If you had a 130hp N.A engine and you wanted 180 hp and you know the pump delivers 644cc a minute what power would the pump supply.
Fuel Flow / K = HP so for N.A engine this pump will deliver 140 hp.
In this example you need to increase the pump flow to more than 828cc minute. In reality most pumps are rated well above the actual output of the engine in order to ensure the fuel injection system works correctly. If the pump is up to the job your next job is to check the injectors are. Divide the flow required at the estimated horsepower output by the number of injectors to get the required injector flow. Remember that you need to have an injector at least 15-20% higher flow than this. This is because to operate reliably injectors should only operate on around 85% duty cycle. So for our engine we want 180 hp from we need an injector of = 180hp x 4.6 = 828cc divide by 4 (4 injectors) = 207cc minute plus 20% allowance for duty cycle = 248 cc min.
Senior Member
Joined: Mar 2006
Posts: 5,754
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Vehicle: 1997 Tiburon
So than using your formula, lets say we have a 255LPH walbro.
255LPH =4250ccpm
So lets see how much power that will support. You said you wanted 600hp?
5.6x600 = 3360ccpm, we still have a lot more in that pump! Lets try 700hp
5.6x700 = 3920ccpm, I think we can squeeze a bit more out of it. Lets find out how much more.
4250/5.6 = 759hp.
So a single 255 walbro supports 759hp, forced induction.
Do you see now why I don't find 3 fuel pumps and surge tank necessary, unless you want a 2000hp monster? laugh.gif
255LPH =4250ccpm
So lets see how much power that will support. You said you wanted 600hp?
5.6x600 = 3360ccpm, we still have a lot more in that pump! Lets try 700hp
5.6x700 = 3920ccpm, I think we can squeeze a bit more out of it. Lets find out how much more.
4250/5.6 = 759hp.
So a single 255 walbro supports 759hp, forced induction.
Do you see now why I don't find 3 fuel pumps and surge tank necessary, unless you want a 2000hp monster? laugh.gif
Thread Starter
Senior Member
Joined: Aug 2004
Posts: 2,764
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From: South Korea where u car from fool
Vehicle: 2008/Hyundai/Tiburon gt
Its ALIVE and running pics and video will soon follow... you will love this hand made buy me. this will be the new standard...
Senior Member
Joined: May 2006
Posts: 537
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From: Kingston ON
Vehicle: 1998 Tiburon
Not to seem that I actually understand MJ's madness but the whole 3 fuel pumps and surge tank is very clever for canyon carving ( apparently he does this stuff lol wink1.gif Anywho Dsports last installment shed a bit of light on that setup. As Mj mentioned the idea is for balanced delivery under lots of g's and deep in the twistys. Also to protect detonation from lean conditions. So a Walboro would do the trick of course, but it may or may not be as good in twisty surprises lol.
That the general idea behind it?
No matter man your car is EPIC!!! Props for not taking any easy way outs.
That the general idea behind it?
No matter man your car is EPIC!!! Props for not taking any easy way outs.
