MK1 20V 4A-GE Engine
Changes that need to be made to accommodate the 20v by system
1. Exhaust
-Silvertop
The complete 16v exhaust system can be used with the 20v silvertop. The only needed modification will be to the outermost flanges of the stock 16v header (pictures are of an ae86 header, but the bolt patern is the same)
Incidently, the egr hole [...]
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Here are the results: 137whp & 111wft-lbs. This is with 103 octane unleaded gas. I don’t really trust the A/F ratio measurements. The tool they use for that is a little suspect, since it was barely even stuck in the tailpipe. After the dyno, I used a friend’s wideband O2 and the results were much [...]
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Another one of the main fabrication hurdles with the swap (but one of the easiest and funnest!) is routing the coolant system lines. Luckily, the input & output of the water system is on the exhaust side of the engine.
Instead of trying to find rubber hose of the exact shape, I purchased some 1-1/4″ 0D [...]
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Here’s a summary of the smaller things that you will need to do that aren’t big enough for their own page:
Fuel line
Contrary to what was previously on this page, the 16V fuel line fits fine with no modifications (both SC & NA). I mistakenly used the 20V line which needed to be extended. Sorry about [...]
Tags: adjust, air filter, belt, CEL, Clutch, ECU, engine, filter, pedal, remove, strut, swap, tensioner, transmission
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The most time consuming part of the swap. I was somewhat reluctant about doing this swap because I was afraid of the daunting task of the wiring. However, once I got into it it was fairly straightforward, but very time consuming. I had no previous experience doing anything like this before. I do have an [...]
Tags: CEL, check engine, check engine light, Clutch, ECU, engine, remove, swap, wiring
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20V 4A-GE • Engines • Exhaust • MK1
For the exhaust, you need to decide if you want to use the 16V manifold or the 20V. The 20V manifold is a much more efficient design, however involves more customization that the 16V. In both cases you will need to weld. I’ll cover both scenarios here.
Using the 20V Manifold
First of all, if you are [...]
Tags: Exhaust, swap, transmission, TRD
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Here’s what you will need to do to convert a front-engine FWD transmission to work in the mid-engined MR2, specifically the C56 transmission.
If you sit the stock C50/52 next to the C56, you can easily see what needs to be done to the new tranny. The red circled area is a point of concern on [...]
Tags: conversion, engine, remove, transmission
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Disclaimer: This documentation in no way replaces the Toyota MR2 Repair Manuals. The purpose of this content is only to provide supplementary information to fellow MR2 enthusiasts. Midship Runabout and its contributing authors will not be held responsible for any injury or damages that may occur as the result of practicing any of the methods or procedures described within this website.
