... Also won't be able to judge its true performance until you run 4.56's for the 31's, or slap on a set of 28's.
Gear ratios.. We have already discussed this topic… but for more insight into my thinking…
I realize that changing the ring & pinion in my truck closer to factory stock (smaller tire diameter) will improve my seat-of-the-pants drivability.
This is just my weird thinking…
There are thousands of posts on forums discussing the modifications of 20/22s. I believe the 22R carb’d engine will allow more power gains with relatively simple modifications – intake, cam, and exhaust – than the 22RE ECU controlled EFI. In my own experience with simple mods (Double Gnarly Air Filter Mod) to my 22R was very noticeable. H8PVMNT's thread on tweaking a carb’d engine proves to me that simple modifications can produce significant power improvements and throttle response.
In the early design of the 22s, I believe that the 22RE, with its sensors and ECU, “controls” and restricts power output. The reason is it’s designed to meet very strict USA, Federal and State emissions regulations and gas mileage.
So… when we attempt to modify it to get more juice out of it, the ECU says “Uh-Uh”.. “gotta keep those emissions and MPG in check!” The 8 primary sensors (Air Flow Meter, Throttle Position Sensor, Water Thermo Sensor, Air Thermo Sensor, O2 Sensor, Start Injector Sensor, Start Injector Time Switch, Ignition Primary Signal, and Starter Signal) in a 1986 22RE input “data” to the ECU. The ECU is programmed to keep engine output within a “boundary”. My 1986 California Longbed Automatic 22RE was rated at 116 HP. I don’t believe the Japanese engineers purposely designed the 1986 22RE and programmed the sensors and ECU, sold into the USA general automotive consumer market, to produce 150 HP… just my opinion.
Does the factory stock 22RE restrict performance gains produced with after market modifications designed to increase torque and HP?
The 22R, however, does not have the limiting controls of an ECU and sensor inputs.
I have been told by very reputable Toyota engine builders who “claim” that modifications to a 22RE will produce noticeable X to XX improvement in HP and Torque numbers. However, I have also been told by very reputable Toyota engine builders who “claim” that basic modifications, i.e. cam and exhaust will NOT produce noticeable X to XX improvement.
And, of course there are all those people out there who “claim” (myself included) to experience noticeable power gains with their modications in both their 20R, 22R, and 22RE engines.
I have spent many hours doing mock dyno tests on my desktop dyno software. I see numbers on paper and some have been substantiated by guys I’ve communicated with.
Here’s my bottom-line: I want to find out for MYSELF what this engine will or will not produce – measured by my seat-of-the-pants butt dyno OR on a chassis dyno – with my specific engine modifications.