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Old 11-01-2008, 10:54 PM   #1
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Forced induction on the cheap

Hello,
First off I would like to introduce myself. My name is Cory and I am a Senior mechanical engineering student at Rose-Hulman Institute of Technology. I have been passionate about cars my entire life. Once I got to college, that really took off. I was a member on University of Pittsburgh's FSAE team working on intake and exhaust design as well as being the head of forced induction. After I transferred to my new school I joined the supermileage team, immediately taking over the engine program. I do work for Castellano Performance Engineering (www.cpeturbos.com) in Chicago and R Sport International (www.r-sportinternational.com) in Portland, OR. I work mostly on Volvos and Vipers (weirdest combo ever), but am looking to get into the V8 Rx7 scene as well. I am pleased to be here. Looks like you guys have a nice little forum.

My room mate has a 2001 Ford Zx3 with the 5 speed manual tranny and Zetec engine. He keeps complaining that it is slow and I said, "Well why don't we do something about it?" I suggested a home made turbo system and he asked how much a bare bones system would cost. I said I thought I could do one for 600 dollars, depending on the tuning required. I read the intro threads to forced induction on the Focus and thought I would run some things by you guys.

My plan was to use the factory tube manifold and a cheap turbo from a Volvo (I can get them very easily), or WRX. Those can be had for 50-100 dollars in great shape. I would obviously have to put some flexible bracing on the turbo so that the manifold isn't taking the entire weight. My friend, Chris, owns an exhaust shop and could probably do a turbo back, 2.5 inch system for 200-250 dollars. For intercooler and intake pipes, I figured I would get one of those ebay kits for 140 dollars. I know lots of people that run them and have success. I can get oil lines from CPE for cheap. This leaves about 150-200 bucks left for odds and ends and engine management.

I have to be honest, I am surprised there are no tuning solutions for the Focus that don't require a box. This is the largest hold up. Our goals are to run about 7-10 psi. So, instead of doing a predator or other such solution, I have started considering doing an extra injector and variable resistor on the IAT sensor controlled by a pressure sensor and PIC controller. I saw that the stock fuel pump is nothing to get excited about, but will it be able to feed 7-10 psi's worth of power? I understand that the Focus doesn't have a return style fuel system. I take it the pump is PWM to keep a constant rail pressure? Are there any obstacles I am going to run into with an extra injector?

My roomy has also been reading around and said someone apparently did a system for $250. Does anyone on here know about this?

Any advice you have to give is appreciated.


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Old 11-02-2008, 12:31 AM   #2
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Don't cut corners with tuning. Do it right and forget the extra injector idea.


Go to Ford they will replace that old 2001 pump with a new one since there is a recall on them. That will help your fuel problem a little.

You need larger injectors also.


Also need a Wideband A/F.
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Old 11-02-2008, 12:38 AM   #3
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Have a wideband and EGT. The new fuel pumps are MOAR better?
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Old 11-02-2008, 12:40 AM   #4
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WAY better lol
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Old 11-02-2008, 12:43 AM   #5
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any changes to fueling you make without actually writing to the EEPROM will be learned out within a week. you really need to either get the SCT Pro Racer Package (or get it tuned by a shop) or try a standalone, but they never work and only save you about $100. PRP is the way to go if you know what you're doing (which it sounds like you do). Literally every single function in the ECU can be modified to your desires.

Check out the sticky thread "so you're planning on going FI"

the pump itself is not PWM, the injectors are.

if you screw with the IAT input on an EEC-V computer your load calculations will be thrown off and you will have a hole in a piston in no time.
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Old 11-02-2008, 12:54 AM   #6
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Does any SCT Ford Tuner work for the Focus, or are they Focus Specific? Are they limited in how many cars they can tune? If I can find someone who will agree to let us use theirs, that might work, as new injectors are only $140 and I can get cheap/free dyno time and can tune myself, especially if I can get a baseline tune to expedite the process.

I was considering megasquirt...but it wouldn't save me any money to do it.
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Old 11-02-2008, 12:58 AM   #7
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Quote:
Originally Posted by illinipo View Post
the pump itself is not PWM, the injectors are.
So the pump doesn't modify it's speed, it just sits there and cavitates against the fuel? I know we experimented with a PWM pump with a returnless system controlled with AEM. It worked great, until the prototype pump (we were beta testers) burned up. Its a good idea because the fuel stays cooler, but it is obviously not as common as a standard return system.
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Old 11-02-2008, 12:59 AM   #8
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Each xcal2 or X3 can only tune one car.

42lb/hr injectors are as low as I would go for 10psi. There are 2 or 3 sets for sale in the BST section of the forum right now for about $120.

the PRP should come with a base tune from the shop you buy it from. They will be able to put in an approximate maf transfer function and the correct values for injector breakpoint and such

im not sure of the mechanism in the pump. But i doubt it is the usual turbine type.
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Old 11-02-2008, 01:04 AM   #9
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Also you are likely going to need a diablosport MAFia. Its possible to get by with just a 3" MAF tube but it will be your limiting component. Once you peg the maf that is it you cannot make any more power.
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Old 11-02-2008, 01:07 AM   #10
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Quote:
Originally Posted by illinipo View Post
Also you are likely going to need a diablosport MAFia. Its possible to get by with just a 3" MAF tube but it will be your limiting component. Once you peg the maf that is it you cannot make any more power.
What are the limits on the stock MAF? Remember, we are just going for 7-10 psi which, looking at dyno graphs, might net us 170 ish FWHP.
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