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post #1 of 2 (permalink) Old 05-22-13, 09:28 PM Thread Starter
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91 ford thunderbird sport 5.0

Hey everyone i have a question about my 91 thunderbird sport 5.0 aod trans. i just bought the car yesterday i wanna know why it doesnt take off from the line very fast but takes off pretty good when going about 40mph. it has the following mods
Port and polished gt40 heads, trick flow upper and lower tubular intake and spacer, 70mm bbk throttle body and spacer, titanium valves retainers and springs new push rods and 1.7 rockers e303 cam flow master exhaust cobra 24lbs injectors and a bbk cold air intake.
the guy told me that he thinks there is a shift kit in it but not sure..
Do i need to put 3.73 gears in it? do i need to put a high flow fuel pump on it...or upgrade my mass air meter please help!
what do you think a good degree is for advancing my timing..

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post #2 of 2 (permalink) Old 05-23-13, 04:02 PM
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Re: 91 ford thunderbird sport 5.0

The most notable difference you'll see is going to the 3.73 gears. You should have 3.08 which are fairly long legs, great for top end and cruising but poor for coming out of the whole. Be advised that going with shorter legs will get up and go quicker, but you're not going to be as comfortable on a long haul. My truck has 4.11 in the back and around town she holds her tongue but cruising around 70... you might want some hearing protection. Right now you're sort of limited by the block itself. Knowing where your peak is on your power curve (in regards to RPM's) will help in the set up. I wouldn't think you'd be out running your fuel pump and I don't think the MAF will make that much of a difference. To some degree, you might notice a difference with the timing as well, it can vary, especially with cams, I'd start at 15 advanced and work towards 20. Old timers used to set the time, then go climb a hill, and keep advancing it until they start to ping.

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Did you ever think that maybe they NEED them?
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