4.0 OHV Dyno w cam upgrade

[clowe1965]

Read it and weep gents.
Stock 200k bottom end with hiflo oil pump
422 cam, beehive springs, non-professionally ported heads, shaved .030 so it should be around 10.5:1. stock everything else except it's straight piped from the y and back. 158@4500 and 212@2900

 

[clowe1965]

 

[gaz]

@clowe1965
• Automatic or manual transmission?
• what size tires?
• which gears in the axle?
• stock exhaust?
• electric fan?

 

[clowe1965]

@clowe1965
• Automatic or manual transmission?
• what size tires?
• which gears in the axle?
• stock exhaust?
• electric fan?

Manual 2wd, running with auto ecu
3.27 gears
225/40/r15s
Straight piped exhaust dumped before the axle
No mechanical fan.
Stock airbox

https://l.facebook.com/l.php?u=https%3A%2F%2Fyoutube.com%2Fclip%2FUgkxeeuj7ldqDsSXtV1hqECU8ejhpF5ID5V-%3Fsi%3DtS9l1PPjhFlRStE3&h=AT2Yw1QQvuSLjv3110FPaYOFIw6BpvwzsOLkylthiBkpyjQE4934CDdWIWvDu34NPhTtvUhtxOOQquCe-3UOCnhOYFbQB_EdnMAunrurYbWUyDF04nhJrME9dy7g&s=1

 

[Jim Oaks]

Read it and weep gents.
Stock 200k bottom end with hiflo oil pump
422 cam, beehive springs, non-professionally ported heads, shaved .030 so it should be around 10.5:1. stock everything else except it's straight piped from the y and back. 158@4500 and 212@2900View attachment 136974

I've seen a lot of people say that they added a cam, but never see anyone share dyno results.

Now to decipher it.

The 4.0L OHV makes a 160hp. There's generally a 10-15% loss of horsepower to the wheels with a manual. In that case, I'm assuming you're 173-181 horsepower which is a gain of 13-21 horsepower. Sound right?

 

[gaz]

@clowe1965
I agree, 158 measured @ the brake is approximately +20+/- HP corrected for transmission loss, for the cam

Good job, thanks for posting the slip plus set up

 

[clowe1965]

@gaz @Jim Oaks
That's a big motivator I had to post, lack of info. The only non-standard item I had was the head porting, I took a lot out of the exhaust ports, probably opened up 15-20% in the restricted sections. Kept the exit about the stock size. I also cleaned up the manifolds, but they were mainly really bad castings so Id put them at still stock level performance.
You can see the power just fall off completely past the 4500 peak. I'm planning to put a bigger maf and tb on it and retest. Eventually a new ecu and tuning might be in order, but if the intake upgrades dont yield any changes pointing out a physical restriction up top then it might be a moot point.

 

[Blmpkn]

@gaz @Jim Oaks
That's a big motivator I had to post, lack of info. The only non-standard item I had was the head porting, I took a lot out of the exhaust ports, probably opened up 15-20% in the restricted sections. Kept the exit about the stock size. I also cleaned up the manifolds, but they were mainly really bad castings so Id put them at still stock level performance.
You can see the power just fall off completely past the 4500 peak. I'm planning to put a bigger maf and tb on it and retest. Eventually a new ecu and tuning might be in order, but if the intake upgrades dont yield any changes pointing out a physical restriction up top then it might be a moot point.

A bigger maf would require tuning just on its own wouldn't it?

 

[lil_Blue_Ford]

A bigger maf would require tuning just on its own wouldn't it?

Probably.

Realistically, where he’s at now with his mods, the old computer is probably not giving him full performance anymore. Close enough to work, but I would have expected slightly more.

Wonder what a free-floating rocker mod or some roller rockers would do for that as well. If I could get out from under all of the projects I’m buried in right now and free up some cash, I’d like to rebuild a 4.0 with all the goodies I can come up with just to see what it gets me.

@holyford86 , got anything to add?

 

[Blmpkn]

Probably.

Realistically, where he’s at now with his mods, the old computer is probably not giving him full performance anymore. Close enough to work, but I would have expected slightly more.

Wonder what a free-floating rocker mod or some roller rockers would do for that as well. If I could get out from under all of the projects I’m buried in right now and free up some cash, I’d like to rebuild a 4.0 with all the goodies I can come up with just to see what it gets me.

@holyford86 , got anything to add?

That was always my understanding.. computer can only properly meter air over the stock maf in a stock diameter intake. Make changes and its gonna be like "TF you trying to do here buddy?"

Sounds like a decent time to buy a twEECer for the op though

 

[clowe1965]

I'll have to keep a look out for one of the older maf with a calibration tube, at least according to the tech pages that would run on the stock ecu.
Most likely going with megasquirt or another stand alone. Trying to manipulate the older computer is a pain between lack of knowledge (no one is using these on the tuning market anymore) and availability. Id hate to spend 300-400 and brick something. Stand alone I can always go back to stock if needed.

I don't think the rocker modifications are really going to net anything until I can go to a higher rpm range. 4900 redline isnt exactly screaming for a valve train. In the plan, just ran out of time before the race event.

 

[clowe1965]

"TF you trying to do here buddy?"

I think this is applicable for the truck in it's entirety. Was 4x4 auto, now 2wd manual, been racing in the danger ranger events with cleetus, road courses with nasa. Can't threshhold brake to save anything, keeps locking up the tires. Did the 95+ spindle mod, next I might get some lowered arms and flip the axle in the back for better cg. Short cab, long bed, weighs in at 3100 lbs with 5 gallons of gas. Fuel cuts on hard braking depending on how ful it is.