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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

Acceleration

Old 01-27-2019, 06:04 PM
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Acceleration

1990 Toyota PU. 22RE 5spd 4x4 4:10 rear. 15x10s with 32inch tires. Lifted 3 inches. 190k miles
Problem: Truck starts right up. Drives fantastic. BUT will not get out of its own way. Its good for local driving. It won't accelerate for s***. Forget the expressway . It doesn't like inclines at all. Tranny was rebuilt 6yrs ago.
I was resolved to a motor rebuild but after speaking with some friends they think it might be the rear gears. Does anyone have any suggestions.
Thanks Lenny
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Old 01-27-2019, 06:07 PM
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Might try advancing your timing a few degrees... its been my experience too little timing results in symptoms your having issues with...
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Old 01-28-2019, 05:04 AM
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Define slow.

Should go 80 in 4th at least, with your gearing and tire size.

31", but still... performance should be similar.


Do a compression test.
Adjust valves and timing.
New fuel filter (a bitch), new air cleaner.
OEM cap and rotor
Then buy a 29,99 Voltmeter and start testing sensors.

For each sensor, you will find something on the net.

TPS (4crawler tps adjustment)
Airflow
Temp sender (ECU)
et cetera
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Old 01-28-2019, 07:34 AM
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Originally Posted by ev13wt View Post
Define slow.

Should go 80 in 4th at least, with your gearing and tire size.

31", but still... performance should be similar. https://www.youtube.com/watch?v=vVuPe83NTUg


Do a compression test.
Adjust valves and timing.
New fuel filter (a bitch), new air cleaner.
OEM cap and rotor
Then buy a 29,99 Voltmeter and start testing sensors.

For each sensor, you will find something on the net.

TPS (4crawler tps adjustment)
Airflow
Temp sender (ECU)
et cetera
Prior to adding the 32s I never had a problem with accelerating or stopping. 75 feels like it's pushing it. The motor seems to struggle at that speed and getting up to that speed takes a while.

I then even had problems stopping the truck. The momentum was too great and I had to bypass the lspv valve , replace booster, upgrade to 1 inch and add manual adjuster just to get it to stop.
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Old 01-28-2019, 07:58 AM
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Are you compensating speedo reading for the larger tire? I can't remember what stock tire size is, you can read it off your door jamb, but let's say it is 28", and you've put on 32s. That is a 14% change in tire size, so your speedo will read 14% low. In this example, 75MPH reading is really 87MPH. So check your door for your stock size.

On top of that, yeah a larger wider tire is really going to bog your truck down. Re-gearing puts you back into the stock RPM range, which helps your pep, but re-gearing can get pretty expensive. Toyota OEM 4.88 diffs and I believe 4.30 can be found, and those are probably going to be the most economical, but sometimes those will have lots of mileage.
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Old 01-28-2019, 08:03 AM
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Time to got to 4.30 or 4.88 gears

Last edited by Robert m; 01-28-2019 at 08:04 AM.
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Old 01-28-2019, 08:22 AM
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I had 31s on it prior and the speedo was off by about 12 mph but with the 32s its only off by about 3mph with a side by side test with another car. I found that strange .

Is there a site that I can use to calculate the correct rear gear's?
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Old 01-28-2019, 09:13 AM
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I pretty much already described the process, read your door jamb to figure out original tire size, find the relationship to the 32" tire size....as I showed in the example above it was 14%.

With your ratio of new to old in hand, if your tire size goes up 14%, your gear ratio needs to go up 14%. 4.10*1.14 is about equal to 4.67, but to my knowledge there is no 4.67 gear ratio, so your choices are either 4.30 or 4.88.
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Old 01-28-2019, 03:48 PM
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Checking it with another car is not 100% accurate as that cars speedo could be off too. Check it with a GPS or a GPS app on a smart phone.
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Old 01-28-2019, 06:01 PM
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60 MPH is 1 mile per minute. Get on the interstate with traffic flowing at or above the limit. Have a passenger time your miles while you keep it at 60. Let us know the results.

You seem to have answered your own question though. It was fine before you put the new tires on it. Bigger and heavier tires can and will slow these small motors down quick.
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Old 01-29-2019, 07:06 AM
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Thank you for all the insight. It makes sense to change out the gears. I am looking into 4:88s .
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Old 01-29-2019, 08:43 AM
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Originally Posted by LIBANKER View Post
I had 31s on it prior and the speedo was off by about 12 mph but with the 32s its only off by about 3mph with a side by side test with another car. I found that strange .

Is there a site that I can use to calculate the correct rear gear's?
The sticker on the door has an axle code, then with a quick search on the forums you can find a chart listing all the axle codes to their corresponding gear ratios. If the truck originally came with 31" tires there should be at least 4.55's in the pumpkins.
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Old 01-29-2019, 10:53 AM
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Originally Posted by thefishguy77 View Post
.... Have a passenger time your miles while you keep it at 60. . ...
How would the passenger know the miles? Looking at the odometer won't help (if the speedo if off due to changed tire size, the odometer will be off by just as much).

There are some places in the US where there are (were?) signs posted at very accurately measured distances along a stretch of 3 miles or so. I think they were originally intended to help the police calibrate their speedometers. I haven't seen one is a while. Using a GPS seems much easier, though slightly less accurate.
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Old 01-30-2019, 07:18 PM
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Mile posts on the freeway/highway.
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Old 01-31-2019, 09:18 AM
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I would trust a GPS to be more accurate at a steady speed and compare it to your speedometer right there, than someone clicking a stop watch and doing the math to figure out your speed?
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Old 01-31-2019, 10:00 AM
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Thats how we used to do it. You shouldnt be off by more than a 1/2 second. The hardest part was getting a steady 60 on your spedo without cruise. Bow I guess with GPS its easier to get a quick baseline. Dont know if all GPS units are equal. But I have had google maps up running with speed displayed, was over limit to make it show my speed, and another GPS app, Spyglass, that I trust more personally. And spyglass matched my spedo google was close.

Both Iphone run side by side same network
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Old 01-31-2019, 11:28 AM
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Originally Posted by thefishguy77 View Post
Mile posts on the freeway/highway.
That's what I use to do before all the smart phone stuff. Best to find a good flat stretch with the cruise set.

Trucking company I worked for swore up and down that my speedometer was right. I said nope it's off seven mph Sure enough they got off their lazy asses, and finally fixed it, and it was off what I said from the get go.

For you guys that have never had an airplane speeding ticket. Ever seen those white hash marks on the highway? They know the distance of those marks, so all they have to do is time you at two marks with a high speed camera. Say hello to the state troopers lined up 20 deep to give you your speeding present.

s=d/t speed=distance/time

Last edited by snippits; 01-31-2019 at 11:29 AM.
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Old 02-02-2019, 08:48 AM
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Originally Posted by 87-4runner View Post
Might try advancing your timing a few degrees... its been my experience too little timing results in symptoms your having issues with...
Originally Posted by LIBANKER View Post
1990 Toyota PU. 22RE 5spd 4x4 4:10 rear. 15x10s with 32inch tires. Lifted 3 inches. 190k miles
Problem: Truck starts right up. Drives fantastic. BUT will not get out of its own way. Its good for local driving. It won't accelerate for s***. Forget the expressway . It doesn't like inclines at all. Tranny was rebuilt 6yrs ago.
I was resolved to a motor rebuild but after speaking with some friends they think it might be the rear gears. Does anyone have any suggestions.
Thanks Lenny
Is the truck new to you? The 22re is a turd, albeit a reliable one. I’ve owned every variation of 80s/90s Toyota. It will feel nimble and torquey in a light little regular cab 2wd but anything else is a slog. It will never be “fast” (relatively) unless you dump $10k into it and even then you’ll be lucky to keep up with the also-slow v6.

Advancing timing won’t make that noticeable of a difference but is worth the 5 minutes it takes.

I’ve only driven one vehicle in my life slower than a 22re truck and that was a ‘76 Westfalia. 25 MPH in 1st/2nd hear up I-70 West of Denver. Thst thing was dangerously slow. Made the 4Runner feel like a racecar.

Unless you bought it specifically to off-road, these trucks are more of a novelty these days.

Last edited by beef tits; 02-02-2019 at 08:49 AM.
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