Im just not happy with my motor... Not sure what steps to take - Ford Bronco Forum
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post #1 of 47 (permalink) Old 04-11-2017, 11:29 AM Thread Starter
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Im just not happy with my motor... Not sure what steps to take

FSB world, im just not satisfied with my motor output. I changed my cam to the xtreme 4x4 one with hopes of increasing the bottom end but it hasnt helped. Im not sure if its a tuning/timing issue, if its my gears n tires or what. Basically i want to spend 5k on a stroker long block and be done lol but that is not an option but a dream.... Basic rundown on the motor, 85 351w ho bored. 30 over, 2.02/1.60 valves in iron heads with port n polish, comp xtreme 4x4 cam, performer intake, truck avenger 670,short tube headers, very free exhaust. All connected to a zf5 turning 37s on 4.11 gears.

What am i to do to get more off the line power? I dont want a race car but i do want more get up and go.

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post #2 of 47 (permalink) Old 04-11-2017, 11:52 AM
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post #3 of 47 (permalink) Old 04-11-2017, 12:07 PM
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With 37s and a ZF, you could likely go to 4.56s or 4.88s, they should give you a good sized boost

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post #4 of 47 (permalink) Old 04-11-2017, 02:14 PM
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big block time..
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post #5 of 47 (permalink) Old 04-11-2017, 02:41 PM
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A 460. You need gears more importantly though, like 4.56's at least. My bronco has a lot off the line I think and I have a 302. The 5.13's are the difference maker.
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post #6 of 47 (permalink) Old 04-11-2017, 02:56 PM
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Is that the only carb you have had on this engine?
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post #7 of 47 (permalink) Old 04-11-2017, 03:07 PM
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Quote:
Originally Posted by Elliott000 View Post
FSB world, im just not satisfied with my motor output. I changed my cam to the xtreme 4x4 one with hopes of increasing the bottom end but it hasnt helped. Im not sure if its a tuning/timing issue, if its my gears n tires or what. Basically i want to spend 5k on a stroker long block and be done lol but that is not an option but a dream.... Basic rundown on the motor, 85 351w ho bored. 30 over, 2.02/1.60 valves in iron heads with port n polish, comp xtreme 4x4 cam, performer intake, truck avenger 670,short tube headers, very free exhaust. All connected to a zf5 turning 37s on 4.11 gears.

What am i to do to get more off the line power? I dont want a race car but i do want more get up and go.

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Aside from gears, you've got an additional problem - you're being bottlenecked by the craptacular stock 80s Windsor heads. Even ported and polished they suck.
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post #8 of 47 (permalink) Old 04-11-2017, 03:08 PM
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seems like you might try a different carb. your gears also need to be at least 4.88's. I run those gears with 35's and its just right. cant imagine 4.10s with 37's

94 5.8/E4OD Edelbrock efi intake, jba headers, transgo shift kit. 6" PC stage II, 4.88 gears, front Aussie. Warn HS9500, custom bumper and sliders. RedHead steering and TieRod flip.
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post #9 of 47 (permalink) Old 04-11-2017, 04:18 PM
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AFR 165 heads and 4.88 gears. I say 165 and not 185 to keep the torque curve lower, with higher figures.

My 94 had this combo with 37"s and e4od. Had plenty of get up and go. About 8 seconds 0-60. Desktop dyno rated my engine 340hp at 6400 rpm and 470 lb/ft at 2000rpm (where the graph began, so idk about below 2k). Was speed density, with comp 35-512-8 XE roller cam. 10.5-1 compression approx. Had the Eddy truck fuel injecton intake. Stock tune, injectors, and TB. With a carb, cam specs don't matter as much as the SD efi.
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post #10 of 47 (permalink) Old 04-11-2017, 05:03 PM Thread Starter
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Quote:
Originally Posted by CrazyBRONCOguy View Post
Is that the only carb you have had on this engine?
Thanks for the replies guys, yes this is the only carb ive ran on it. Ive tried richer and leaner, neither seem to make a difference

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post #11 of 47 (permalink) Old 04-11-2017, 06:53 PM
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Like Big Bleu said, heads will be a huge increase. With the aluminum GT40x heads, I got the advertised 65 HP increase, with exhaust, headers, intake and a comp cam. So I think you have everything you need but heads. I am at about 275 HP, and assloads of torque, so I am about at the end of my injector flow. You should carb up, and gear down, you'll have it. You got to remember, a 37 is a lot of weight to get turning, for any engine. With 33s I get to 60 in just under 8 seconds, with my automatic transmission.
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post #12 of 47 (permalink) Old 04-11-2017, 07:44 PM
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I'd get at least 4.88 gears before motor.
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post #13 of 47 (permalink) Old 04-11-2017, 09:07 PM
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I think the carb is too big if what you want is low end response. I only run a 625 on my 460 in my '78. I totally agree with anyone that you will give up some on the high end but your not saying you have issue there so maybe no big deal.
Like a lot of others I think gears will help also.

Which of the 4 extreme 4x4 cams did you put in? if the x4270 what your describing makes perfect sense. Also at what RPM do you usually let the clutch out?
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post #14 of 47 (permalink) Old 04-12-2017, 01:25 AM Thread Starter
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I put the x4250 in there. id say i let the clutch out around 1000 rpm, never really paid attention but I will now.

Id like to keep the carb as I am very happy with its performance when bouncing around off road, Gears are something Ive been considering for quite awhile and may start trying to figure out. Ive always wanted heads but they are an expensive addition that I have put off. I guess Im at the point now where the seat of my pants says its time to get the high dollar items lol!

Those gt40x swirl heads loo pretty great, are they ok to use with a flat tappet cam? i only saw roller info on there. Also, with an assembled head will I be able to pull my rocker studs/plates and reuse all my valve train components aside from the springs if they line up with the cam references? or should one get ned valve components with new heads

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post #15 of 47 (permalink) Old 04-12-2017, 02:02 AM Thread Starter
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****balls, a gear change to 5.13 thick cuts w/ install kits will be 1500 buckeroos taxes in.... Canadian money is junk . I do the install, might have to withdraw some cash from the stash lol

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post #16 of 47 (permalink) Old 04-12-2017, 06:59 AM
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Have you drove it in 4 lo but 2wd? Maybe try that first, just to see if the gears are really what you need. The 5.13's should be just a little less then you current 4.10's but in 4 lo, especially with he 1.96 low that the 205s have, assuming yours is stock.
It should be like 5.13's may act if you drove your current setup in 4lo and started off in 3rd. As in your 3rd (in 4lo) would be 2nd or 1st with 5.13s.
If you were closer Id let you borrow my 31's so you could also try it like that and see if gears are going to get what you need before spending the money.
Gear Ratio Calculator the best website for comparisons for gears and tire sizes.
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post #17 of 47 (permalink) Old 04-12-2017, 09:21 AM
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$1300 for gears or $1300 for heads? I would do the gears first. GT40's work with flat tappets and the valve springs are rated up to .600 lift. I have .544 lift and stock pedestal rockers.
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post #18 of 47 (permalink) Old 04-13-2017, 08:12 PM
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I agree with everyone else. Gears and better heads. I have the X heads and like them, but as stated in other threads there are better heads. Even if the real world difference is only slight. :)

I run 4.11s with 33" tires. I wish there was a way I could have ran 4.30s.

Good luck and hth
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post #19 of 47 (permalink) Old 04-13-2017, 08:18 PM Thread Starter
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Right on, im goin to go and put the tcase in lo and cruise around the block from 2nd and third. They arent the same ratio but close enough that i could use it as a comparison so to speak. Ill have to decide. Probably gears then new tires in the winter. Heads will have to wait awhile lol

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post #20 of 47 (permalink) Old 04-13-2017, 08:28 PM
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Quote:
Originally Posted by Elliott000 View Post
Right on, im goin to go and put the tcase in lo and cruise around the block from 2nd and third. They arent the same ratio but close enough that i could use it as a comparison so to speak. Ill have to decide. Probably gears then new tires in the winter. Heads will have to wait awhile lol

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Well don't wait too long on the heads, none of us are getting any younger! lol

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