Performance Mods for a Speed Density 302
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Senior User
Joined: Apr 2003
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From: Edmonton, AB Canada
Performance Mods for a Speed Density 302
I have a 92 F150 running an 88 Speed density system for a 302. I am looking into doing some mods in the mean time to give this truck some more bottum end torque till this motor decides to give up the ghost and I get to build my stroker motor. My questions are as follows:
Will the stock speed density computer be able to handle a head swap and an intake swap? (Heads: Ford GT-40, Intake: Edelbrock Performer EFI)
If so will I need to get a chip burned for it to run smoothly and dependably?
The performance increases that I have on this truck so far are a custom 2.5" y-pipe with a flowmaster exhaust kit(3" in/split 2.5" out) kit, as well as a set of shorty headers and a K&n FIPK. I also plan to use the new heads and intake on the new stroker motor, which will also be built with the ideas of low end torque and decent horspower numbers (300-350). This truck is still a daily driver and my work truck so some resemblance of mileage would be nice, though I am only getting 13 mpg now.
Thanks.
Will the stock speed density computer be able to handle a head swap and an intake swap? (Heads: Ford GT-40, Intake: Edelbrock Performer EFI)
If so will I need to get a chip burned for it to run smoothly and dependably?
The performance increases that I have on this truck so far are a custom 2.5" y-pipe with a flowmaster exhaust kit(3" in/split 2.5" out) kit, as well as a set of shorty headers and a K&n FIPK. I also plan to use the new heads and intake on the new stroker motor, which will also be built with the ideas of low end torque and decent horspower numbers (300-350). This truck is still a daily driver and my work truck so some resemblance of mileage would be nice, though I am only getting 13 mpg now.
Thanks.
Posting Guru
Joined: Nov 2005
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From: La Grande, OR
the way I understand how SD works, you won't have to get a chip for it to run right, but it won't get the full benefit because the engine is working on a pre-determined amount of air.
You will have to get something done when you throw in that stroker though.
You will have to get something done when you throw in that stroker though.
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Joined: Jun 2004
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From: Florida
With all the money spent on mods you might as well convert. The improve alone will make it worth it. There are non expensive ways of doing it with boneyard mustang parts. At most you will avg 15mpg, and I doubt it will get that with gt 40 heads and SD.
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From: Edmonton, AB Canada
I am planning on converting to mass air when I put in the stroker motor, but in the meantime i would like to have something better than just the easy bolt on stuff that everyone else has. I built the rest of the truck and would like something a little less stock under the hood, but not get too carried away until I am ready for the stroker motor.
Also after reading into the Gt-40 heads that ford motorsport offers, they only bolt on with the gt-40 mustang intake, so I have switched gears and looking at the edelbrock performer heads.
And as for full benifit of the mods, would that entail a custom burnt chip or say a generic jet chip or something like that? Also what are the average costs of a custom burnt chip and where would I start looking for one?
Also after reading into the Gt-40 heads that ford motorsport offers, they only bolt on with the gt-40 mustang intake, so I have switched gears and looking at the edelbrock performer heads.
And as for full benifit of the mods, would that entail a custom burnt chip or say a generic jet chip or something like that? Also what are the average costs of a custom burnt chip and where would I start looking for one?
Last edited by Tdvjensen; Mar 10, 2007 at 10:02 PM.
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I agree with thomadm, convert over to mass air now and dont worry about what mods will run with SD. SD prob wont handle the motor you want and will cause more problems. I kept my SD and installed a custom cam (very mild) with some headers. Thats about all you can do with it. It was a decent improvement but it is by no means a screamer.
Posting Guru
Joined: Nov 2005
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From: La Grande, OR
as for intakes with the GT-40 heads, check out the explorers. Ford explorers with the 302s had GT40 heads, so their intakes will work too. I know that if you want everything custom tailored to what you have for the best gain, a custom burnt chip is the way to go, but I don't know where to find them, or how much they cost.
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Where woud you get a burned chip from if you did invest alot of money into a SD engine...? I am going to have GT40 iron heads and a GT40 style intake on my 92 F-150 302 motor very soon..
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Postmaster
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From: Central PA
You doing good for miage. Maybe get 15 MPG tops .
I checked around for a custom chip and transport for price put MAF setup out of 94 in the best worked great. I paid $800.00 for truck used trans and MAF wiring etc. I have put together 3 others from scap yard parts. Average is 300-400 for parts . good luck
I checked around for a custom chip and transport for price put MAF setup out of 94 in the best worked great. I paid $800.00 for truck used trans and MAF wiring etc. I have put together 3 others from scap yard parts. Average is 300-400 for parts . good luck
Posting Guru
Joined: Dec 2003
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From: Northern California
Since your planning on going over to MAF with your future stroker, make that your first invertment for the current engine, you'll be able to use it all in your future engine anyways. This is your best bet and you wont be wasting your time with other mods then.
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From: Edmonton, AB Canada
Originally Posted by lostin90s
You doing good for miage. Maybe get 15 MPG tops .
I checked around for a custom chip and transport for price put MAF setup out of 94 in the best worked great. I paid $800.00 for truck used trans and MAF wiring etc. I have put together 3 others from scap yard parts. Average is 300-400 for parts . good luck
I checked around for a custom chip and transport for price put MAF setup out of 94 in the best worked great. I paid $800.00 for truck used trans and MAF wiring etc. I have put together 3 others from scap yard parts. Average is 300-400 for parts . good luck
And again thank you all for your input. Its really interesting to see what works and what doesnt before spending a pile of cash to be dissapointed at the end of the weekend when the truck goes back together.
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Joined: Jul 2006
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From: Central PA
If you put stock Maf on your truck . You will have to swap injector harness. (and if you have old firing order swap around wire in conector to match new. As for the kits they seen way to high priced . I'd peice on together.
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From: Ottawa, Ontario
The dyno simulation programs assume the intake systems are different for the sequential and tuned port applications. Changing form batch fire to sequential on an F150 makes very little difference in the torque powerband. Sequential mass air using the mustang ECC does a little better actually because the computer has more accurate info and the base maping is more agressive than the truck tables.
BTW. .the best bang for your buck upgrade on that stock 5.0 truck motor is put a cam in it. The factory grind is very mild, you are not getting anywhere near the full potential from the stock heads or intake with it. If your motor is an '88, it has a flat tappet cam and there are several nice cams that will work with the SD computer including the one I have and the Comp Cams 31-255-5 and 35-255-5(HO firing order).
BTW. .the best bang for your buck upgrade on that stock 5.0 truck motor is put a cam in it. The factory grind is very mild, you are not getting anywhere near the full potential from the stock heads or intake with it. If your motor is an '88, it has a flat tappet cam and there are several nice cams that will work with the SD computer including the one I have and the Comp Cams 31-255-5 and 35-255-5(HO firing order).