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Spare the tranny, don't go 80% injectors?

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Old 11-27-2017, 09:51 AM
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Spare the tranny, don't go 80% injectors?

I'm about to do a $4,000 upgrade on our 7.3. It has forged rods so I feel okay going for 500 HP. I was planning to go with 80% injectors, new cups, bigger turbo, new ducting, Banks power elbow and downpipe, tuner and Command Module screen. That's not an exhaustive list.

But my mechanic just did all that, and roasted the tranny in his Excursion. Now I'm wondering if I should go to something less than 80% injectors just spare the life of my tranny. A very good, fully built 4R100 transmission costs about $4,000. Mine has been rebuilt and beefed slightly, but not prepped for 500 HP. Nobody does fully stock rebuilds here in Texas anymore, because they got tired of customers coming back angry.
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Old 11-27-2017, 10:00 AM
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Well, the simple and short answer is that any HP/TQ increases dramatically reduces the life of the transmission. The best transmissions in the business are from BTS, John Wood, Diesel Site and the HD4R100. Some people are aware of local shops that are capable of doing a damn fine job too though.

500 HP is going to require a lot of transmission.

Just having 80% injectors is not the only factor, what cc injector are you looking to run with the 80% nozzles?

Roasting a transmission has a lot to do with modifications, but has more to do with what your right foot does to the skinny pedal.
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Old 11-27-2017, 10:13 AM
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If I were shooting for 500 hp, and I am, I would run 238cc/100% nozzles. The 100% nozzles will get the fuel in quicker and lower EGTs.
I would also plan for a drastically shortened transmission life so start saving right away for that.
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Old 11-27-2017, 02:08 PM
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A stock 4R100 is barely capable of handling the power from a stock 7.3L. As soon as you start adding go-fast goodies, you make it harder and harder for a stock trans to survive. If you are really going for 500 HP, a stock transmission might not make it to the end of the street.

I would also re-think the Banks stuff. It's very expensive and while there isn't always something better out there, there is almost always something cheaper that works just as well.

What kind of tuner are you looking at and what is a command module screen?
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Old 11-27-2017, 03:04 PM
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Originally Posted by HD Rider View Post
If I were shooting for 500 hp, and I am, I would run 238cc/100% nozzles. The 100% nozzles will get the fuel in quicker and lower EGTs.
I would also plan for a drastically shortened transmission life so start saving right away for that.
Ask Krazee Matt how long his transmission lasted with 238/80 injectors.
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Old 11-27-2017, 03:40 PM
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I'm going to guess about a week.
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Old 11-27-2017, 03:49 PM
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Do both.

Do the injectors and then a few months later do the transmission.
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Old 11-27-2017, 04:41 PM
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Quote:
Originally Posted by mecdac View Post
Do both.

Do the injectors and then a few months later do the transmission.
Are ya sure you got the order right on that?
Injectors first and a new transmission and a tow will be required, transmission first and he could get the other go fast goodies at his leisure. Just my $0.02
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Old 11-27-2017, 05:11 PM
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Are ya sure you got the order right on that?
Injectors first and a new transmission and a tow will be required, transmission first and he could get the other go fast goodies at his leisure. Just my $0.02
I "had to" do the HPOP and injectors first and I know at some point I'll be doing the transmission.
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Old 11-27-2017, 07:59 PM
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But wait, guys, my tranny is already rebuilt, and beefed. It's not beefed like a $7k ATS trans, but it's rebuilt to last longer than stock. It shifts flawlessly and firm.
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Old 11-27-2017, 08:25 PM
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Quote:
Originally Posted by Sous View Post

Roasting a transmission has a lot to do with modifications, but has more to do with what your right foot does to the skinny pedal.
I ran a stock 250K+ transmission with 160/100% AND 250/200% injectors for a looooonngggg time. I don't beat on the poor thing though; just a daily driver. It made a few dyno runs, five runs down the 1/4 mile, and then 12.5K miles with the 160/100% injectors and lived. Then it went 3000+ miles on the 250/200% injectors until I preemptively replaced the transmission with a Ford HD unit (not like it's a really "beefy" transmission but figured the warranty was worth it). I kept the core and still have it in my shed....in working condition.

It all boils down to how you drive it.
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Old 11-27-2017, 10:08 PM
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^ THIS!!! Also keeping the tranny cool will help it survive for a while.
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Old 11-28-2017, 09:15 AM
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Quote:
Originally Posted by andym View Post
I'm going to guess about a week.
It took time, but with them dialed back to 160/100, it was hanging by a thread. He ended up building a solid trans that stood up to the power and begged for more

Quote:
Originally Posted by z31freakify View Post
^ THIS!!! Also keeping the tranny cool will help it survive for a while.
This is why my 7.3 Excursion has had a 6.0 trans cooler since 2009. I've had zero cooling issues and all I've done is change the fluid every 30K.
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Old 11-28-2017, 10:20 AM
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You are going to need custom tuning with bigger injectors not the Banks tuning. Your transmission will be on borrowed time unless you run it on a low power tune until you upgrade. I killed my auto with 120K on it with stock injectors.
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Old 11-28-2017, 10:34 AM
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Quote:
Originally Posted by 00t444e View Post
You are going to need custom tuning with bigger injectors not the Banks tuning. Your transmission will be on borrowed time unless you run it on a low power tune until you upgrade. I killed my auto with 120K on it with stock injectors.
My auto is still going with over 220k on it. I'm still on stock injectors with all the mods in my sig and I have flogged it.
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