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 ...
- 23.5k
8
votes
Accepted
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 ...
- 12.4k
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 ...
- 1,136
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 ...
- 3,139
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 ...
- 151
4
votes
Accepted
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 ...
- 12.2k
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, ...
- 2,944
4
votes
Accepted
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 - ...
- 34.6k
4
votes
Accepted
MAF Clamping & Tuning
The MAF is a very accurate flow meter that sits in the intake air path. Its job is to tell the engine how much air is being drawn into the engine, so it can inject the correct amount of fuel to keep ...
3
votes
Accepted
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 ...
- 12.4k
3
votes
Accepted
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 ...
- 39.1k
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 ...
- 23.5k
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 ...
- 34.6k
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. ...
- 12.4k
3
votes
Accepted
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 ...
- 12.4k
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 ...
- 8,956
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 ...
- 81
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 ...
- 12.2k
2
votes
Accepted
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 ...
- 66
2
votes
Accepted
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 ...
- 153k
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 ...
- 3,012
2
votes
Accepted
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 ...
- 141
2
votes
Accepted
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 ...
- 12.4k
2
votes
Accepted
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 ...
- 28.7k
2
votes
Accepted
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, ...
- 153k
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 ...
- 8,010
2
votes
MAF Clamping & Tuning
The bottom line is, the MAF doesn't see boost, it sees air flow. The Manifold Absolute Pressure (MAP) sensor can see boost. In most normally aspirated cars, the MAF (if even equipped) and MAP work ...
- 153k
1
vote
How to get started tuning ecus?
Your best starting point is probably to get a standalone mappable ECU such as an Emerald K6 or an Omex. These will come with a basic configuration to get you started and the appropriate software to ...
- 9,989
1
vote
When doing an engine swap , do you have to have a matching ecu
With modern "engine" swaps, it is very easy to miss the point.
What you traditionally think of as an "engine" is really not much more than an air compressor.
The beating heart of ...
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 ...
- 34.6k
Only top scored, non community-wiki answers of a minimum length are eligible