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Author
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Topic: how to get some low end torque?
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65mustang
Gearhead Posts: 138
From: Stockton,CA
Registered: Jul 2001
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posted 04-26-2002 10:58 PM
   
i need some low end power in my 66 fastback with 289/c4. i have 3.80 gears, pertronix electronic ignition, crower beast cam, but not alot of low end power. i dont care about top speed because i do not pass 80mph anyway so i need some good street racing power. what modifications would anyone suggest for me to get some low end power?thanks. ------------------
66 fastback 289 C4 w/shiftkit and B&M Pro Stick shifter holley 650 carb edlebrock performer intake 3.80 w/ posi under rider traction bars and front anti sway bar american racing torque thrust wheels
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Mpcoluv
Gearhead Posts: 945
From: Charlotte NC usa
Registered: Apr 2001
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posted 04-27-2002 08:38 AM
what are the specs for the cam? what intake and carb are you running?
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Larry Jennings
Gearhead Posts: 540
From: Redwood City, Ca. USA
Registered: Apr 2000
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posted 04-27-2002 01:31 PM
There aint a lot of info here, but a good thing to try an pep it up a bit is either a recurve or lock out of the dist and get some low end lead in it.------------------
No matter what's happening, there's always somebody that takes it way too seriously.
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steve'66
Gearhead Posts: 6522
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 04-27-2002 05:16 PM
Larry,I was gonna say that too, but I read in another post that he's running a stock converter. Sooo, my vote is for a hi stall converter then lock out the timing. SteveW
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Larry Jennings
Gearhead Posts: 540
From: Redwood City, Ca. USA
Registered: Apr 2000
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posted 04-27-2002 05:57 PM
OOOH  Thanks Steve. "DO NOT" lock out the timing if the converter is gonna keep it under a hard pull below 2500 Rs, although it's not common it can push the crank out and cause slick streetidness  .------------------
No matter what's happening, there's always somebody that takes it way too seriously.
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65mustang
Gearhead Posts: 138
From: Stockton,CA
Registered: Jul 2001
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posted 04-27-2002 07:25 PM
i did not have the engine rebuilt or i would have went all out. the previous owner had it built and all i know about the cam is that it is a crower beast. i have no idea on specs. im certain it is very mild. holley 600 carb. and edelbrock performer 289 intake. pertronix ignition. pretty sure it has stock torque converter. what would i be gaining and losing buy putting in a higher stall torque converter?thanks. ------------------
66 fastback 289 C4 w/shiftkit and B&M Pro Stick shifter holley 650 carb edlebrock performer intake 3.80 w/ posi under rider traction bars and front anti sway bar american racing torque thrust wheels
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steve'66
Gearhead Posts: 6522
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 04-27-2002 08:00 PM
You won't loose anything if you keep it tight. I'd recomend a tci street fighter with about a 2800 stall for your car. They're pretty cheap and should rreally help out your launch. What it'll do for you is the engine will jump to 2500+ and the converter will multiply the torque for you off the line. You'll be closer to the engines peak torque rpm and your next problem will be traction.  Do not do the rev it up and drop it into gear trick!SteveW
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Dusty Kiser
Gearhead Posts: 126
From: Bethel,Oh USA
Registered: Mar 2002
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posted 04-27-2002 09:13 PM
quote:
Originally posted by 65mustang:
i need some low end power in my 66 fastback with 289/c4. i have 3.80 gears, pertronix electronic ignition, crower beast cam, but not alot of low end power. i dont care about top speed because i do not pass 80mph anyway so i need some good street racing power. what modifications would anyone suggest for me to get some low end power?thanks.
Let's assume everything is is top notch condition. The compression is good, timing chain in good shape, transmission isn't slipping, the chassis and suspension good, it isn't scrubbing the front tires or anything that's going to WASTE power. Now, you need to know what your static compression and cam specs are. The best indicator of engine condition is vacuum. You should have 18 to 21 inches of vacuum at idle. If not, you need to find out why. Make sure the timing pointer on your damper is at TDC. Make sure you have the correct pointer . Check your base timing AND your total timing. If any of these things are beyond the scope of your tools or training, make buddies with someone who has the skills and tools to get it right. I never had a problem with lack of bottom end with my 289's. Only getting the power to the road. Throotle response and low end is the forte of the windsors. The single biggest mistake made by young drivers is trying to modify an engine that isn't sound to start with. If funds are a problem, like I said make the right kind of freinds. Hell, you might even find a local gear head who hates cutting his grass! Good luck. If you can provide more specific info as to what you have and it's state of tune we'll all be glad to help any way we can.
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jkilroy
Gearhead Posts: 1719
From: Vicksburg, MS
Registered: Dec 99
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posted 04-28-2002 01:07 AM
By chance do you know which specific "beast" grind you have. Crower makes at least 5 different grinds with "beast" in the name. Here is a link to a PDF file that describes the various profiles.http://www.crower.com/pdf/24.pdf One way you could find out it to pull a valve cover and use a dial indicator to measure the movement of the valve. Divide by your rocker arm ratio and that will tell you actual lobe lift. If you don't have one, a dial indicator is a very useful item to have around, and you can pick up an import with a magnetic base off of ebay for $10 or less. ------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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bluestreek
Gearhead Posts: 1289
From: Athens,GA
Registered: Jul 2001
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posted 04-28-2002 09:02 AM
Even the smallest one on the list is too big for any low end torque below 2500 rpms a on 289 Ford. No wonder you're looking for some low-end torque. Pull it out and get something with 220-224 duration @.050 lift and 110-112 lobe center if you need some kind of torque below 2000 rpms. Otherwise you're gonna have to get a 3000 stall converter like mentioned earlier to move your combination up to where your cam starts pulling hard.BS
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