seems sluggish
Thread Starter
|
New User
Joined: Oct 2010
Posts: 13
Likes: 0
seems sluggish
hi, i'm looking for a little insight. i got a 83 f-250 with a 300, offy c, edelbrock 600, efi manifolds, hi flo cat and 2.5'' exhaust. it also has a np435 and 4.11s. it seems to work well on the flat and in all gears but 4th. on even a small highway incline it seems almost gutless in 4th gear. I find this odd with the 4.11s. Any input would be great! Thanks
Thread Starter
|
New User
Joined: Oct 2010
Posts: 13
Likes: 0
tires, 235/85/r16. i did alot of messing with the timing, 2nd new distrubtor, 1st sheared off a gear. and speed varies if i am at 65 on a small hill it'll stay there or only drop like 5mph, less it will drop more, almost seems like a dead spot floor it and no change in rpm or speed
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
235 85R16s are the same as 32" tires. That'd put you at 2850 RPMs at 65mph. I agree, you should have plenty of power at that point. (I was curious about tires in case you were getting out of your RPM range with the 4.11s).
What transmission do you have? Is 4th a 1:1 or an overdrive?
How old is the cat? Is it plugged? (I know you said it was high flow so I imagine new-er).
Are you certain the vacuum advance is working?
Is the carburetor tuned correctly?
Plugged fuel filter?
What transmission do you have? Is 4th a 1:1 or an overdrive?
How old is the cat? Is it plugged? (I know you said it was high flow so I imagine new-er).
Are you certain the vacuum advance is working?
Is the carburetor tuned correctly?
Plugged fuel filter?
Thread Starter
|
New User
Joined: Oct 2010
Posts: 13
Likes: 0
np 435 sp it should be 1:1, vacuum advance works, dist. is only 4 months old, it does move when ya give it gas, cats like 2 years old, but 1st carb i used was dumping fuel, could that have ruined it? tuning wise the plugs are light brown and only smokes after several days of sitting. maybe valve seals, but no smoke when running normal.
Thread Starter
|
New User
Joined: Oct 2010
Posts: 13
Likes: 0
i was thinking, 4.11s were too much gear for the combo of tranny and tire size i have, keeping me out of my ideal rpm range, 3rd gear 35mph i'm at like 3000rpm
Trending Topics
Senior User
Joined: Sep 2009
Posts: 108
Likes: 0
I'm having the same problem. I have the offy dp with an edelbrock 600. I'm running 31s with the 4 speed and 4.11s and granny through 3rd its beast but when i hit 4th there's low power i can hear the 4 barrel kicked in but not much pull. It's running 2000rpm at 55.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread Starter
|
New User
Joined: Oct 2010
Posts: 13
Likes: 0
yea i hear mine opening to, since ya can't adjust a edelbrock to open how ya want it to. is it opening far enough at 2000 rpm, i noticed in 3rd gear and 3000rpm ya really hear it but at 2000 rpm not so much
Lead Driver
Joined: Dec 2000
Posts: 6,289
Likes: 47
From: South central, Minnesota
You did a lot of mods to the engine. You need to recurve the distributor to take advantage of the mods.
Here's a good link. It's for a big block but same basic info.
http://www.reincarnation-automotive....ons_index.html
Here's a good link. It's for a big block but same basic info.
http://www.reincarnation-automotive....ons_index.html