rusefi.com

Hi,

I have an old Toyota that at some point will get a new engine, but I want to learn some tuning & building by torturing the current one. Please correct me about any wrong assumptions, as this is all quite new to me.

My engine is a Toyota 3S-GE (gen 2). I want to add a supercharger to it (probably one from a Mercedes SLK).
This is a 10:1 compression 4-cylinder with an un-tunable ECU from 1990, and a distributor based ignition system.

As I understand it, since the ECU is not built to handle compression, I would need to adjust timing and increase fuel injection, which is easiest to achieve with a programmable ECU. I figure it would be best to switch to coil packs for better ignition tuning capabilities?

And probably replace/add some sensors for MAF/MAP/intake temperature and fuel pressure so the ECU can make decisions based on those.

All of this is happening on a budget - I'm not looking to spend more than maybe a 1000 euros on this engine, except for maybe parts that could be reused after an engine swap (fuel injectors, fuel pump, intercooler etc).

Any tips would be helpful! I'm an embedded software engineer by trade, so the electronics and software bit doesn't scare me that much, but I know almost nothing about cars. I'm not worried about ruining the engine, but it would be a shame if I ruined it without learning anything!

Good news it's _really_ hard to damage an engine while idling under no load.

Other news is that fine-tuning the engine to run great would be the most complicated part of the ordeal.

Well, optimizing is the last 80% of the effort, first I would need to get the thing up and running. I'd already be elated if I got it to idle for starters.

Is there a base tune that can be used for an engine like this, or should I create a base map from scratch?

I'm sorry if these are stupid questions - I'm trying to learn.

all engines would start on same default map

wvdschel wrote: ↑

Tue Oct 27, 2020 12:50 pm

Well, optimizing is the last 80% of the effort, first I would need to get the thing up and running. I'd already be elated if I got it to idle for starters.

Is there a base tune that can be used for an engine like this, or should I create a base map from scratch?

Once you have your sensors/trigger inputs configured, you don't need much more to attempt a start. Pretty much all engines will idle at 50-70% VE, and 20 degrees of timing. It might not run great, but it'll run.

A MicroRusEFI looks perfect for what you want, but every rusefi works for you.

I recommand you to use pieces from 3S-GTE, like crank sensor, injectors and COP.
For 2JZ, for example, you can put the oil pump of the GTE on the GE to have the hole and sensor for the crank sensor. Just had a wheel with missing tooth behind the crank pulley and you are good for semi sequential. I don't know for the 3S, but it's considered like the inline 4 2JZ.

You have a lot of choices with toyota and "smart" COP, personnaly, I use 1ZZ one on my 1JZ.

A correct MAP sensor is really simple to use and tune.

The 3S-GE is subject to headgasket failure, the 3S-GTE has multi-layer steel and is bulletproof, not the GE. A replacement can be considered if the engine is more accessible before the failure. (or maybe already replaced ? )