DeathLK

I'm wondering why my 4runner's rpms are too high. Is it the fault of the 3.0 V6?
When I'm driving my 1994 Toyota 4runner 5 speed on the Freeway my RPMs are up there. When I'm going about 65-70 in 5th, my rpms are at 3000 and above. I want to know if there is something I can buy or change to lower my RPMS or is it just the fault of the engine. Also its flat land not hills or anything.

donomite49

sounds about right to me, you can put bigger tires on and lower the RPM, that is untill you downshift to pull cajon pass lol.

i used to live near Hemet. hold down Berdoo.

jbtvt

You can re gear your rear differential with a lower ratio, must do the front also if you ever use four wheel drive. That's about it really. Check your ratio here - http://www.brian894x4.com/Gearratiosanddiffs.html and look for a parts truck with a smaller number.

nothingbetter

that rpm level sounds about right.

DeathLK

Is there anyway to lower it though? I'm trying to save some gas.

DeathLK

I haven't put my truck through the Cajon pass just yet. I want to upgrade a bit before I end up there. Put going back down should be fun

combatcarl

It'll be even more gutless and suck more fuel at road speeds at lower rpm. They're designed to run around 3k at speed. It ain't a Ford.

'89 22RE 4x4 longbed DLX
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nothingbetter

carl nailed it. Lower rpm doesn't mean less fuel. You'll be at a lower rpm, but your throttle will be farther open to maintain the same speed since your farther out of the power band. So it will be injecting fuel less often, but will be injecting more fuel when it does!

But if your set on it. The only way to lower your rpms that I know of are re-gearing your diffs, changing your tire size, or changing the gear ratio of your transmission.

TNRabbit

That's stock speed. If you lower it, you'll never be able to go up any hills without downshifting. You're talking about a 4,000+ lb truck with a 150 hp engine. It's a torquey unit, but just not enough oomph for the weight/brick-like coefficient of drag~

DeathLK

Will Regearing help me out with gas?

combatcarl

What size tires on the truck now?

'89 22RE 4x4 longbed DLX
Sent from my LG-P505 using YotaTech

TNRabbit

You'd be struggling so much I doubt it. Unless you're on flat land (like Kansas flat).

So what exactly is your fuel MPG? There are a lot of things other than gearing that can cause MPG drop. Old O2 sensor is the most common culprit.

Pat8942

If you want good MPG you should have bought a economy car, 4runners are not good on gas, and almost all 4WD are gas hogs and were never meant to be MPG champs, but it will go almost anywhere, you should have considered this from the start.

nothingbetter

no. Buy a bicycle or a vw tdi.

Roark

I've got a pickup on 31's with stock gearing and average 17 mpg while my uncle's lifted, geared 4Runner sitting on 33's gets 18.. So these factors shouldn't make THAT much of a difference, if any. For example, intake, exhaust, additives, and the like have done nothing for my truck's mpg. I suppose it's all in the cards.

But of course, YMMV.

dzldust

My 1988 Runner with 4.10 gears and the stock Wrangler 225/75/15's sits at 3000rpm in 5th gear at 70mph

jbtvt

Yeah, if improving mpg was the goal, there are much easier ways to go about it as said. O2 is a good check, but even a basic tune up should give you something. You can also advance timing and adjust the spring inside your VAFM. Good thread on that if you search for it.

combatcarl

If you are set on lowering your rpm, the easiest way to do it is to increase tire size. Regearing would require front and rear gear sets, not hard, but harder than tires. All this, if fuel mileage is not a concern.

'89 22RE 4x4 longbed DLX
Sent from my LG-P505 using YotaTech

DeathLK

I currently have P265/70R16 on my truck. I know it isn't a fuel economic vehicle but I'm trying to get the best I can until i can afford my engine swap.

combatcarl

Oh. Well with 265/75s, you might have been regeared already. Did you get it recently, or did you put those tires on it?

'89 22RE 4x4 longbed DLX
Sent from my LG-P505 using YotaTech