351W Maximum torque rpm?
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Cargo Master
Joined: Aug 2007
Posts: 2,560
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From: New Zealand
I probably wouldn't change the rear (F250 with 3.54 axle) but it has an AOD trans - I'm in a hilly area & with the reputation of the AOD , I'm considering a change to a NP435 if it gives me problems. I would lose overdrive but with this axle & our terrain, I don't think it should be a problem.
I would like to know the torque/rpm figure just to be sure that I wouldn't end up with a poor combination
I would like to know the torque/rpm figure just to be sure that I wouldn't end up with a poor combination
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FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
What year is it truck and is the motor original? The reason I ask is because the 351 was never mated to an AOD from the factory, and the EFI motor makes 90% of full TQ right from torque converter lockup. If the AOD is in good shape now a shift kit will go a long way to keeping it that way for the forseable future.
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Post Fiend
Joined: Aug 2006
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From: Yorkton Sask
not to hijack this thread, but question for you... 351 windsor with edelbrock airgap intake, 600cfm 4bbl carb, headers and free flow exhaust will merit how much power and torque?? this will be my setup...
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Cargo Master
Joined: Aug 2007
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From: New Zealand
Thanks for those figures Hemieater - I think it should all work pretty well
With my tires & diff I'd be doing 100kph (60mph) at 2350rpm in top gear & thats the local speed limit. So loaded or empty, it should be a good all-round combination for me.
Paul - it's an 1983 Light Duty F250 (7300lb GVWR). You're right - it has had it's original 302 replaced with the 351W. The truck (& trans) have done 163,000 miles but the engine has done less than 4000 since being rebuilt.
I haven't driven it yet - I'm in New Zealand. The truck is in transit here from San Diego. I had it checked over by the importer & the transmission seemed fine, I'm just looking ahead - I'll get all the life I can from the AOD, but I prefer manual transmissions anyway
With my tires & diff I'd be doing 100kph (60mph) at 2350rpm in top gear & thats the local speed limit. So loaded or empty, it should be a good all-round combination for me.
Paul - it's an 1983 Light Duty F250 (7300lb GVWR). You're right - it has had it's original 302 replaced with the 351W. The truck (& trans) have done 163,000 miles but the engine has done less than 4000 since being rebuilt.
I haven't driven it yet - I'm in New Zealand. The truck is in transit here from San Diego. I had it checked over by the importer & the transmission seemed fine, I'm just looking ahead - I'll get all the life I can from the AOD, but I prefer manual transmissions anyway
Postmaster
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I ran the program again, for some reason I thought the first pull was high. It was set up with open headers and the intake was wrong... Here is what it gives for a stock 351W with 1 1/2 long tube headers with a holley 2bl on a production intake
Analysis Report for Mild Street Engine with Desired HP Peak at 5000 RPM
Peak Tq =340. @ 2500 RPM .97 Ft Lbs per CuIn
Peak HP =238. @ 4000 RPM .68 HP per CuIn
Analysis Report for Street/Strip Engine with Desired HP Peak at 5000 RPM
Peak Tq =352. @ 3500 RPM 1. Ft Lbs per CuIn
Peak HP =263. @ 4000 RPM .75 HP per CuIn
Maximum Exhaust System Backpressure 'Exh Pres' is 2.3 PSI.
This is typical for a street/strip vehicle with a free flowing,
full exhaust system. To simulate open headers, select the
'Open Headers' from the Exh System Type combo box.
Analysis Report for Mild Street Engine with Desired HP Peak at 5000 RPM
Peak Tq =340. @ 2500 RPM .97 Ft Lbs per CuIn
Peak HP =238. @ 4000 RPM .68 HP per CuIn
Analysis Report for Street/Strip Engine with Desired HP Peak at 5000 RPM
Peak Tq =352. @ 3500 RPM 1. Ft Lbs per CuIn
Peak HP =263. @ 4000 RPM .75 HP per CuIn
Maximum Exhaust System Backpressure 'Exh Pres' is 2.3 PSI.
This is typical for a street/strip vehicle with a free flowing,
full exhaust system. To simulate open headers, select the
'Open Headers' from the Exh System Type combo box.
Posting Guru
Joined: Nov 2004
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From: sunny fla sometimes windy
Engine_Specifications
The aod ain't that bad of a tranny as long as you keep the fluid fresh and the
temp below the fluids breakdown point. So a temp gauge should be used on
any tow rig and any truck that has bigger than stock tires!! Unless you enjoy
tranny work bigger tires is a special operating condition and needs all the
fluids changed out more often (trans, diffs, hub grease power steering fluid)
Lincolns OnLine | Tech Tips and Articles
The aod ain't that bad of a tranny as long as you keep the fluid fresh and the
temp below the fluids breakdown point. So a temp gauge should be used on
any tow rig and any truck that has bigger than stock tires!! Unless you enjoy
tranny work bigger tires is a special operating condition and needs all the
fluids changed out more often (trans, diffs, hub grease power steering fluid)
Lincolns OnLine | Tech Tips and Articles
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