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93 300 efi straight 6 sheap performance mods 
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Post 93 300 efi straight 6 sheap performance mods
ive been a ford fan for ever and just got a new truck its a 93 f150 4x4 with a 300 straight six efi and was wonder about some cheap and simple performance mods i could do were im not realy looking to pull apart the engine yet if u have any good ideas of wat i could do please let me kno already doing exuast hedder and true dual straight pipe


Last edited by ford92 on Sat Feb 13, 2010 9:21 am, edited 1 time in total.



Fri Feb 12, 2010 5:56 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
I'll start. Low restriction exhaust system. Best bang for your buck

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Fri Feb 12, 2010 8:18 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
With stock exhaust manifold would changing the exhaust rearward from there help any?

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Sat Feb 13, 2010 3:06 am
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Post Re: 93 300 efi straight 6 sheap performance mods
well


Last edited by ford92 on Sat Feb 13, 2010 9:22 am, edited 1 time in total.



Sat Feb 13, 2010 8:17 am
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Post Re: 93 300 efi straight 6 sheap performance mods
THE FRENCHTOWN FLYER wrote:
I'll start. Low restriction exhaust system. Best bang for your buck

well im getting a headman hedder and running true dual straight pipes and eventualy getting a chip and programer but i was looking for other ideas as well


Sat Feb 13, 2010 9:20 am
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Post Re: 93 300 efi straight 6 sheap performance mods
The header is pretty much a waste of money on a stock or near stock engine which already has the EFI exhaust manifolds

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Sat Feb 13, 2010 3:11 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
Keep the EGO sensors and catalytic converters - replace everything from the cat back.

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Sat Feb 13, 2010 10:12 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
FTF: would StrangeRanger's exhaust recipe quality for "low restriction"? Any suggestions to improve his recipe for a stock motor?
viewtopic.php?f=2&t=60567&start=0

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Sun Feb 14, 2010 10:01 am
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Post Re: 93 300 efi straight 6 sheap performance mods
That sounds like a good way to go. I think you could use Flowmaster Series 50 or 40 mufflers. They are probably even less restrictive than Series 70s but probably also noisier. Your call.

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Sun Feb 14, 2010 2:14 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
I went with the 70 because it is quieter. The techie from Flowmaster assured me that there was no appreciable difference in performance. They make the 40 and 50 louder "for kids" :lol:

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Sun Feb 14, 2010 7:10 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
Wel call me Sonny, I am using the 50s. Are the 70s the same size as 50/40s?

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Sun Feb 14, 2010 7:15 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
70s have a bigger body than the 40/50s

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Sun Feb 14, 2010 7:26 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
That must have been why I chose the 50s for my '46 PU. Adequate space was an issue. For sure I didn't want the 40s.

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Mon Feb 15, 2010 9:04 am
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Post Re: 93 300 efi straight 6 sheap performance mods
THE FRENCHTOWN FLYER wrote:
Keep the EGO sensors and catalytic converters - replace everything from the cat back.

y would i want to keep the ego sensors and the catalatic converter i dont need them to pass inspection or anything like that and there going to restrict my exuast flow and its going to have a better sound with out them


Mon Feb 15, 2010 2:56 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
StrangeRanger wrote:
The header is pretty much a waste of money on a stock or near stock engine which already has the EFI exhaust manifolds

well on acount its only 175.99 its not much money and it will have a better flow and nicer sound along with the facter that i can run true duals of the header because of the fact its a split header so y wouldnt i want to change it


Mon Feb 15, 2010 3:00 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
1) The EFI will not work without the EGO sensor(s). It needs the signal to maintain closed loop control. Remove them and you will lose a lot of power and burn a lot more gas.

2) Since you already have the twin EFI manifolds, which are essentially cast shorty headers, you are already set up to run true duals.

3) Headers are problematical. They sometimes have sealing issues and they rust out unless they are ceramic coated, which you're not going to get for $175.99. Unless you're making a lot more HP than stock, the gains you're going to see from headers vs. the EFI manifolds are pretty minimal.

4) Catalytic converters in good condition cost something on the order of 3HP. I assume you still breathe air, so I would also assume that you would want that air to be as clean as is practical. Also be aware that removing them may or may not cause you a problem with your state BMV but it is against Federal law and subject to substantial penalties. You can be fairly certain that the regulations are not going to get easier over time and that your state will eventually start inspecting for cats like most of the others already do. Keep the cats.

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1993 Mustang 5.0 (hot rod and auto-x monster)
1982 Tiga Formula Ford (SCCA racecar)
2013 Hyundai Elantra Coupe (daily driver)


Mon Feb 15, 2010 3:50 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
StrangeRanger wrote:
1) The EFI will not work without the EGO sensor(s). It needs the signal to maintain closed loop control. Remove them and you will lose a lot of power and burn a lot more gas.

2) Since you already have the twin EFI manifolds, which are essentially cast shorty headers, you are already set up to run true duals.

3) Headers are problematical. They sometimes have sealing issues and they rust out unless they are ceramic coated, which you're not going to get for $175.99. Unless you're making a lot more HP than stock, the gains you're going to see from headers vs. the EFI manifolds are pretty minimal.

4) Catalytic converters in good condition cost something on the order of 3HP. I assume you still breathe air, so I would also assume that you would want that air to be as clean as is practical. Also be aware that removing them may or may not cause you a problem with your state BMV but it is against Federal law and subject to substantial penalties. You can be fairly certain that the regulations are not going to get easier over time and that your state will eventually start inspecting for cats like most of the others already do. Keep the cats.


well the header has a ego sensor hole and the stock manifols only has a single outlet so it is impossible to run true dual exuast with out the dual outlet header that im buying and the cat is of no importance to me im not a save the earth freak. since the truck is a 93 its of no importance during inspection and will not be checked. my main resaon for wanting the headers is more for the sound than the horsepower gain i relize i wont gain much but when i do get the programer and throw 50-100 more horspwer at the engine as the programer says it can do it will do a lil


Mon Feb 15, 2010 6:02 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
LOOK AT YOUR EXHAUST MANIFOLDS.
The stock exhaust manifolds on a '93 are split. There is one for cylinders 1-3 and one for cylinders 4-6. They are configured as cast shorty headers. Each has a separate downpipe which are joined together at the front cat. You can run your duals straight from the manifolds.

You're not going to get "50-100 HP" with a programmer. You will need significant internal modifications, specifically head work and a cam. You will also have to upgrade your injectors.

There is absolutely no justification whatsoever for removing the cats from a street-driven vehicle. I don't give the proverbial rodent's posterior about how much noise it prevents you from making or how many HP you erroneously think it costs you. We all breathe the same air. If you want to pollute your lungs that is certainly your right but you have no right to pollute anyone else's. Just get over your attitude and leave the cats in place

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Mon Feb 15, 2010 7:10 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
StrangeRanger wrote:
LOOK AT YOUR EXHAUST MANIFOLDS.
The stock exhaust manifolds on a '93 are split. There is one for cylinders 1-3 and one for cylinders 4-6. They are configured as cast shorty headers. Each has a separate downpipe which are joined together at the front cat. You can run your duals straight from the manifolds.

You're not going to get "50-100 HP" with a programmer. You will need significant internal modifications, specifically head work and a cam. You will also have to upgrade your injectors.

There is absolutely no justification whatsoever for removing the cats from a street-driven vehicle. I don't give the proverbial rodent's posterior about how much noise it prevents you from making or how many HP you erroneously think it costs you. We all breathe the same air. If you want to pollute your lungs that is certainly your right but you have no right to pollute anyone else's. Just get over your attitude and leave the cats in place


i was only saying wat the paper work with the programer and chip said i havent actualy tested it yet and i undersatnd wat ur saying about the cats and ik it only cost like 5 hp. as far as i knew it wasnt a split maniflod thanx for the info tho but other than exuast work wat else is there i can do with out tearing apart the engine


Mon Feb 15, 2010 7:18 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
There are only two ways to increase the performance of an engine:

1) Increase the volumetric efficiency, i.e. increase the amount of fuel/air mixture which the engine consumes. In general this requires internal modifications. The improved exhaust is one of the few things you can do externally that helps but it will help only slightly since the exhaust system is not the choke point on the 300.

2) Reduce the parasitic losses. In general, this can be done externally but gives very little return on investment.
To reduce parasitic losses normally you'd concentrate on the belt driven accessories, but no one makes underdrive pulleys for an engine that only turns 3500 RPM so you're SOL there. You could put in an electric fan but since you already have a clutch fan you're only going to pick up a couple of HP and you'd have to upgrade the alternator to run it. Before you even ask, the smog pump, if working properly, only costs about 1/2HP; leave it alone.

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1993 Mustang 5.0 (hot rod and auto-x monster)
1982 Tiga Formula Ford (SCCA racecar)
2013 Hyundai Elantra Coupe (daily driver)


Mon Feb 15, 2010 7:38 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
StrangeRanger wrote:
There are only two ways to increase the performance of an engine:

1) Increase the volumetric efficiency, i.e. increase the amount of fuel/air mixture which the engine consumes. In general this requires internal modifications. The improved exhaust is one of the few things you can do externally that helps but it will help only slightly since the exhaust system is not the choke point on the 300.

2) Reduce the parasitic losses. In general, this can be done externally but gives very little return on investment.
To reduce parasitic losses normally you'd concentrate on the belt driven accessories, but no one makes underdrive pulleys for an engine that only turns 3500 RPM so you're SOL there. You could put in an electric fan but since you already have a clutch fan you're only going to pick up a couple of HP and you'd have to upgrade the alternator to run it. Before you even ask, the smog pump, if working properly, only costs about 1/2HP; leave it alone.


Doesn't a 300 want more exhaust volume than the stock 2 inch system? I know stock were only talking 140hp, but if we wanted to increase that to say 170hp then we would need a system that supports 170hp and not 140hp. Sense were talking about 300 Cubic Inches, I would think a proper exhaust would show a good number with a engine this size, not like your little 3.0L engine that are running around town that might show a 5hp increase with a catback.

IMO, 2.5 Minimum, 3 inch probably do-able with a correct system without tq loss.


Mon Feb 15, 2010 9:43 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
I've got a 2.5" on mine but there isn't a lot to gain from it.
The head is the real restriction and fixing that takes surgery

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1996 F-150 (tow missile)
1993 Mustang 5.0 (hot rod and auto-x monster)
1982 Tiga Formula Ford (SCCA racecar)
2013 Hyundai Elantra Coupe (daily driver)


Mon Feb 15, 2010 9:49 pm
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Post Re: 93 300 efi straight 6 sheap performance mods
Back around 1990 the federal fine for removing catalytic converters was I think $10,000.

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White 04 Ranger 2wd 2.3 5sp 143hp 3.73 134k miles


Tue Feb 16, 2010 12:48 am
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Post Re: 93 300 efi straight 6 sheap performance mods
StrangeRanger wrote:
There are only two ways to increase the performance of an engine:

1) Increase the volumetric efficiency, i.e. increase the amount of fuel/air mixture which the engine consumes. In general this requires internal modifications. The improved exhaust is one of the few things you can do externally that helps but it will help only slightly since the exhaust system is not the choke point on the 300.

2) Reduce the parasitic losses. In general, this can be done externally but gives very little return on investment.
To reduce parasitic losses normally you'd concentrate on the belt driven accessories, but no one makes underdrive pulleys for an engine that only turns 3500 RPM so you're SOL there. You could put in an electric fan but since you already have a clutch fan you're only going to pick up a couple of HP and you'd have to upgrade the alternator to run it. Before you even ask, the smog pump, if working properly, only costs about 1/2HP; leave it alone.


well i was also lookeing to eventualy put in a performance cam witch i havent been able to find anywhere and have my head ported and pollished but aint sure how much that will cost me and higher injectors but aint sure how big to go


Tue Feb 16, 2010 4:02 pm
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