I have an 87 GT with speed density. I am thinking about adding new aluminum heads, intake, exhaust, basically changing everything but the block and i have heard people run into problems when they try to get too radical with speed density. I was just wondering if I would be better off converting to mass air when i do all the upgrades or if I'll be alright just leaving the speed density system the way it is?
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302 cubic inches of raw power wrapped in sheet metal with a throttle cable for a leash is THE DOG I'M WALKIN'
Keep valve overlap @ .050" lift at zero or negative (no overlap) and you'll be OK. SD needs a good idle vacuum signal for the MAP sensor to work the fuel curve well. My 88 SD cam has 112.5° lobe seperation and runs great.
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Tom Moss
88 GT 5spd Vert 3:73s, Flowmaster catbacks, stock cam +4°, GT40P heads & 1.7 rockers, Jet-Hot coated MAC P headers, 97 Explorer intake, 65mm TB and 19# Explorer injectors. 277RWHP/330RWTQ
Can someone explain to me exactly how speed density works?
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Stephen and the Blue Demon
89 LX vert
Holley 750, Edelbrock Vic Jr, TFS T/W heads, FRPP X cam, Crane 1.6 rr's, longtubes w/Dynomax Bullets, PA Super Comp C4 w/brake, Precision Performance Kwik Shift II, Art Carr 3200 w/ ballooning plate, NOS super powershot plate, complete UPR tubular front suspension w/coilover conversions on Lakewood 90/10's
It measures the amount of fuel needed (MAP and other sensors) based on manifoild vacuum (indirect airflow measurement) from Fords prototype 5.0 HO engine testing.
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Tom Moss
88 GT 5spd Vert 3:73s, Flowmaster catbacks, stock cam +4°, GT40P heads & 1.7 rockers, Jet-Hot coated MAC P headers, 97 Explorer intake, 65mm TB and 19# Explorer injectors. 277RWHP/330RWTQ
It measures the amount of fuel needed (MAP and other sensors) based on manifoild vacuum (indirect airflow measurement) from Fords prototype 5.0 HO engine testing.
I see. so this is from the time before my best friend the Mass Airflow meter?
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Stephen and the Blue Demon
89 LX vert
Holley 750, Edelbrock Vic Jr, TFS T/W heads, FRPP X cam, Crane 1.6 rr's, longtubes w/Dynomax Bullets, PA Super Comp C4 w/brake, Precision Performance Kwik Shift II, Art Carr 3200 w/ ballooning plate, NOS super powershot plate, complete UPR tubular front suspension w/coilover conversions on Lakewood 90/10's
Tom Moss
88 GT 5spd Vert 3:73s, Flowmaster catbacks, stock cam +4°, GT40P heads & 1.7 rockers, Jet-Hot coated MAC P headers, 97 Explorer intake, 65mm TB and 19# Explorer injectors. 277RWHP/330RWTQ
I'll be at St Louis Internatinal again this year for the big Ford show - we could meet up then. I always wear a 5.0Tech.com t-shirt with "tmoss" stenciled on it.
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Tom Moss
88 GT 5spd Vert 3:73s, Flowmaster catbacks, stock cam +4°, GT40P heads & 1.7 rockers, Jet-Hot coated MAC P headers, 97 Explorer intake, 65mm TB and 19# Explorer injectors. 277RWHP/330RWTQ
Awesome, ride on man. I definately plan on being there, I'll keep an eye out for ya hopefully I might have my car running 'right' before then. Anyhow, I cannot wait for that event. I'm from Caseyville so the track is like.. right down the road
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Traded: 1986 GT, 5spd, 92k miles
BBK 1 5/8 shorty headers, BBK Offroad H-Pipe, Flowmaster American Thunder catback, 5" Monster Tach with Shiftlight.
My wife grew up in Caseyville/Collinsville. We go over to the VFW for Friday night fish on a regualr-irregular basis as her family still lives in Collinsville.
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Tom Moss
88 GT 5spd Vert 3:73s, Flowmaster catbacks, stock cam +4°, GT40P heads & 1.7 rockers, Jet-Hot coated MAC P headers, 97 Explorer intake, 65mm TB and 19# Explorer injectors. 277RWHP/330RWTQ
My wife grew up in Caseyville/Collinsville. We go over to the VFW for Friday night fish on a regualr-irregular basis as her family still lives in Collinsville.
That's cool, how old is your wife if you don't mind me asking. She may have went to school with my mom or something lol, never know.
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Traded: 1986 GT, 5spd, 92k miles
BBK 1 5/8 shorty headers, BBK Offroad H-Pipe, Flowmaster American Thunder catback, 5" Monster Tach with Shiftlight.
She's 48 - I married a child I'm 56. Her maiden name was Sharon Williams and her sister and brothers are Jeanice, Gary and Roger. Mom and Dad are Ray and Mary.
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Tom Moss
88 GT 5spd Vert 3:73s, Flowmaster catbacks, stock cam +4°, GT40P heads & 1.7 rockers, Jet-Hot coated MAC P headers, 97 Explorer intake, 65mm TB and 19# Explorer injectors. 277RWHP/330RWTQ
There are chips that will make a SD car run with whatever mod you want to throw into them.
Just a matter of locating a good chip tuner that knows SD systems well.
Including radical cams in the stock DA1 computer?
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Tom Moss
88 GT 5spd Vert 3:73s, Flowmaster catbacks, stock cam +4°, GT40P heads & 1.7 rockers, Jet-Hot coated MAC P headers, 97 Explorer intake, 65mm TB and 19# Explorer injectors. 277RWHP/330RWTQ
speed density, worth keeping? 
Stephen and the Blue Demon
I'm 56. Her maiden name was Sharon Williams and her sister and brothers are Jeanice, Gary and Roger. Mom and Dad are Ray and Mary.
