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20 votes

How do these similar engines differ so much in power output?

The biggest difference is that the M3 engine uses a cast iron engine block compared to the alu-sil block of the 330. Under hard (very hard) use, alloy blocks can physically twist and deform whereas ...
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7 votes
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What is the benefit of Forged Internals in an engine? Pistons, etc

Forging is a process where hot metal of the rough shape is then very forcibly squished by exact shape dies, severely compressing the metal or alloy molecules. There are internal tensions created ...
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5 votes

When doing an engine swap , do you have to have a matching ecu

GM engine management software (from your old Impala ECM) is not going to be able to run a Honda engine. If you managed to flash the Honda software onto your GM ECM, you'd likely brick the device. A ...
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5 votes

How do these similar engines differ so much in power output?

So I think that you have most of the reasons in your question. But I will list a few more that I think is possible: Higher compression ratio Different inlet manifolds Probably larger valves Lighter ...
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5 votes

How do these similar engines differ so much in power output?

I'm not an automotive engineer, but the differences are primarily: higher rpm higher compression ratio probably a better cylinder head design (valves, ports etc.) All these things create more power ...
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4 votes
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How can a car be tuned for low/mid/high end torque?

If the powertrain is identical, there's not much the ECU can do. The word tuning is thrown around a lot and means different things to different people. ECU tuning is one thing, and basically you can ...
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4 votes

How can a car be tuned for low/mid/high end torque?

The only thing you can tune while keeping an engine mechanically 'identical' as you word it, is playing with ignition timing and AFR. If you have variable valve timing and you know what you're doing, ...
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4 votes

Can reading from the ODB port interfere with a custom STO map?

I am a CAN App programmer so I would like to share a bit of my experience. Yes, you can report false. It's even very simple. Just watch for messages you don't like and then report error. But what is ...
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4 votes
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When doing an engine swap , do you have to have a matching ecu

There are 3 options: 1) use the ecu matching the engine 2) purchase a third party tuning ecu and get it programmed to suit 3) have a tuning company re-program the existing ecu from the old engine - ...
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3 votes
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Why do modern PCMs prefer MAP over MAF

In the turbo applications I am familiar with, both a wire or film (better) type MAF is used, in conjunction with a MAP, IAT, ECT, etc. Specifically on turbosupercharged Subarus, there's knowledge to ...
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3 votes
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Can a tune eliminate the need to avoid redlining a cold engine?

The tune might reduce the severity of the problem, but it can't cheat physics. As explained in this answer, redlining while the engine is cold puts undue stresses on the engine that shortens its ...
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3 votes

Tuning cars from the 90's and prior

One of the most popular modifications on pre-injection cars is conversion to multiple twin choke carburetors. For example Weber DCOE carbs. Typically this involves changing the inlet manifold which ...
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3 votes

Tuning cars from the 90's and prior

You can add anything including turbos , intercoolers, fuel injection, nox injection - just takes money and technical knowledge. If you want a relevant example of design progression look at the inline ...
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3 votes
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Is there a viable option for updating OBD-I to OBD-II in order to increase possibility of engine tuning?

I think it's a very laudable enterprise. I also think your "fish" isn't gonna last long. Your best bet is to convert to an aftermarket injection and ignition system (Haltech comes to mind; but there ...
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3 votes

Please help with my Intake for Opel Corsa 2014

This is a very difficult question to answer. Altering the airflow path before the airflow sensor can lean out an engine, which might improve performance, but cause unnecessary heat and stress. ...
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2 votes

Tuning an ancient carbureted Honda motorcycle

For you backfire check the following components. Clean Spak plugs Clean carb Clean air filter If the other two dont work then there might be issue with valve seating, not 100% sure but there are ...
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2 votes
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Reprogramming a Magneti Marelli Microplex MED604C

As I noted in the comments, I don't think the ECU is programmable, hence why you can't find anything on the topic online. It can still be "chipped", i.e. removing one or more EPROM's and soldering in ...
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2 votes
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How inaccurate is the stock wideband 02 sensor in the SG9 Subaru Forester XT at WOT

I wish I could provide you with facts, I map to reality and facts are the basis of it. Alas, I cannot. I do not believe you will have valid information unless you sample the stock 02 sensor and map ...
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2 votes

How can a car be tuned for low/mid/high end torque?

normally it would just be changing gear ratios/final drive just like you said, you could also do different tires/tire sizes as well, the person could go as far as changing the transmission if they ...
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2 votes

Is there a viable option for updating OBD-I to OBD-II in order to increase possibility of engine tuning?

As explained in other answers, the short of it is, no it is not easily feasible. For your purpose, a tunable after-market ECU would be necessary. You may be interested in an open-source ECU, that you ...
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  • 12.1k
2 votes

2002 kawasaki zx6r stutters

Does it happen at any throttle setting? It looks like your 2002 ZX-6R is carbureted, so it could have something to do with your jets. Different components of the carburettor are responsible for ...
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2 votes
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Tuning cars from the 90's and prior

I'd suggest a good starting point for you to look at is the tuning options available within the Gran Turismo games (4, 5 or 6, haven't played the earlier games so I don't know how the tuning options ...
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2 votes
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Is it possible for me to see oxygen, caused by valve overlap, in the exhaust gases?

TL DR: I would suggest you have an exhaust leak up stream of the sensor location. I know you said it doesn't have a leak, but I'd suggest you just haven't recognized it. Valve overlap only occurs ...
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2 votes
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Engine Starts Screeching at Low RPM and Continues When RPM is Raised

As stated, it definitely could be a belt. It also sounds like the bearings in your alternator are going out. I think it may be a combination of both. Being that the screeching increases when you ...
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2 votes
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How to get started tuning ecus?

I would suggest that you look at Megasquirt - it's a DIY ECU, and was designed from the start to allow people to learn about engine controls and how to adapt them. From their website: MegaSquirt is ...
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2 votes
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Ride stiffness vs roll stiffness

"Ride stiffness" refers to the spring rate, or road feel, of the entire vehicle. Does a rough road jar your teeth? "Roll stiffness" might be created by anti-roll or anti-sway bars, and refers to the ...
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2 votes
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Vacuum never decreases while leaning out carburetor mixture

I believe you are going about it slightly wrong. Here's what I found out about the adjustment for the Q-jet: Start by completely warming the engine and setting the idle speed where it’s comfortable, ...
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2 votes

Vacuum never decreases while leaning out carburetor mixture

Qjets are bad about the secondary metering well plugs leaking fuel which causes a rich condition, this explains why vacuum never drops off. Most Kits include a metering well closed cell sponge to stop ...
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1 vote

Can Engine Lugging cause Piston Ring wear?

I don't believe lugging it twice will be the cause, neither will blaming the change of oil. Without comparison values going back over time so that the progression can be seen, if any... One thing to ...
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1 vote

Nissan Sentra vvl

Usually these processing units in your case the dictator mangement system functions are programmed into a chip. So it just boots when the battery is on. So they cannot be erased until you reset them ...
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