The Post Whore Thread!

[IGOTASTi]

Make them wonder. You'd be surprised about the pm's I get on there.

Now I'm curious.

 

[Z1107]

Fuji should have his title changed to forum headhunter or 1A recruiter. Keep up the goodwork.

 

[Z1107]

Fuji you need to come to Atlanta next Friday. I got the invite to a Victoria secret modeling event after party.

 

[IGOTASTi]

poor leo... he is still in the running and able to compete though...

HOLY CRAP! Glad hes OK.

 

[Z1107]

Subaru announced 2014 for the new WRX release. 3 door hatch with a 1.6L electric turbo DI boxer 4.

 

[Vermont]

Subaru announced 2014 for the new WRX release. 3 door hatch with a 1.6L electric turbo DI boxer 4.

Bull shit!

 

[Z1107]

Bullshit to what? 3 door hatch, 1.6L 4, or the electric turbo?

 

[Paul.c]

It doesn't matter what he is saying bullshit to, he will be angry regardless. Subaru could announce the re-release of the 05 and 06 STi in a spec-c version exclusively for the USDM and he would still find something to bitch about.

 

[IGOTASTi]

Eh, I'm moody myself. Why can't shit be simple dammit!



Butt posted over Tapatalk

With you Fuji nothing is simple. I have learned that already!

 

[Vermont]

It doesn't matter what he is saying bullshit to, he will be angry regardless. Subaru could announce the re-release of the 05 and 06 STi in a spec-c version exclusively for the USDM and he would still find something to bitch about.

Lol fuck you dude... even if you are right . I am pissed about the hybrid part. Small displacement engine? Nt a problem as long as it is turbo charged. The 3 door hatch part is fine as well... means the car will be lighter. It is the hybrid part that pisses me off.... why the fuck would we want a fucking electric motor on a sports car? The only company that has made a hybrid sports car, that actually works, is porsche. In the track monster they built they used the electric motors to give a boost of speed which is quickly drained as it does not use batterys, which is then charged back up during breaking.... kinda like a NOS button on the need for speed games.

 

[Z1107]

Mark only the turbo will be electric not the motor

 

[Vermont]

I think what you mean is not an electric powered turbo but an electric motor used as a power booster, a turbo if you will.... this is what I am talking about when I said hybrid... a hybrid by definition is a mix of electric and gas motors. The problem is this adds complexity to the system and also adds weight as the power generated needs to be stored some way until it is used.... I would much rather prefer a traditional small displacement, direct fuel port injected flat 4 with a variable geometry turbo.... but I guess that is too much to ask for from a large multi national auto and heavy equipment manufacturer....

 

[Vermont]

Also, I'd rather see a hydraulic fluid powered supercharger, not electric...



Butt posted over Tapatalk

Why?.... just why? Super chargers are old tech they are an out dated relic of a bygone era... Turbo chargers are more efficient in every single way. The only down side to the majority of current turbos is their lag and the fact that boost takes time to build. This has been solved already though by porsche and holset. With the introduction from both companies of the variable geometry turbo...

 

[Z1107]

It is an electric turbocharger Subaru has been working on since 2007. They claim it will have no lag and more boost control. Only the turbo is electronic, Mazda and Ford have tried them on test cars but couldn't work out the bugs, Subaru has been hush about it.

 

[Z1107]

Oh and Subaru again confirmed that the STi is being dropped as the top of the line model instead the WRX will be rally oriented car and the STi will be a track oriented car. We'll see in 2014 if that's true. Doubt it is.

 

[Td_d]

FML, my home PC's motherboard is fried (and the PSU). Irritating to have to shell out for it, and damn it, I don't feel like assembling a PC... sigh. Having to use my tuning netbook which is as slow as ass...

So I've been having fun trolling the genius who tuned my car initially, before I learnt all of this. Went onto the local board to help a mate out, and realised that in the absence of others knowledgeable in tuning, he's the afficionado on the board. Been having great fun poking holes in all the self important pearls of wisdom that are being thrown around In the kingdom of the blind, and all that

Here's a great example

also remember injectors and there duty cycle - anything above 82% means the injector is open all the time and your power just tapers off

Are you saying that injectors go static above 82% ? I do not believe that is correct, and I think an oscilloscope would prove it (in fact, I've seen the results) - I agree that it's not a good idea to run IDC above 80-85% - primarily to give yourself some headroom in colder weather / lower altitudes, but there are guys running injectors at over 100%. If I'm not mistaken the '08 STI's 550's are closer to 90%IDC from the factory. Once you factor in dead time, you're only reaching static well above 100%. Running 750's I logged 122% IDC - at which point I of course was leaning out dangerously, so pulled back.

oz on fuel injector duty cycle - do the maths yourself an injector is open 100% of the time at 82% duty cycle - remember to factor in latency and how fast an engine is rotating - (put it this way when the next cylinder is getting ready for its intake stroke - the faster the engine turns the faster this happens - work out how many times an injector has to fire at 6k rpm on a 4cyl ? then divide that by the fuelling needed or called for in the cu - a pulsewidth of 18ms is not unheard of - if the engine/ecu is needing injector to be fired every 15ms then the injector is open all the time) and the next intake stroke occurring - there is simply not enough time for the injector to open and close - it also means the mechanics inside the injector are at risk and this is how injectors get damaged and literally burnt out - an injector is simply a coil that is activated by electric current to pull the injector pintle and allow fuel to flow

when you are seeing more than 82percent injector duty cycle it means your fuelling is being controlled purely by the flow of the fuel pump - if you fit it big fuel pump you can run at static injectors and let the fueeling work like a gardena hose pipe

Sorry ? disagree with the maths. You?ve got the latency calcs the wrong way round.

Injector duty cycle, as it?s calculated for our 4 cylinder is as follows:

IDC = RPM * IPW / 1200

Now there?s evidence that the Subaru Ecu factors latency into that calculation ? so say a 1ms latency means an additional 1ms to open and 1ms to close.

So at 6000 Rpms, to get IDC of 100%, you would need to be firing for 20ms. Except that you?re only firing for 18ms (given the latencies on either sides of 2ms), which means that your true IDC is actually 90% (6000*18/1200).

So as our ecu?s report it, you are only reaching true 100% - i.e. static by definition (the injector never has time to open or shut) ? at around 22ms ? i.e. IDC = 110%. Add into the mixture potential inaccuracies in how the ecu reports RPM (hence the jagged nature if you look at CAN generated or fast poll logs), the possibility for the IDC to be reported as 120%.

So in a nutshell ? when you see the IDC being reported as 82%, with the stock 550?s injectors with a latency of .81ms at 14v, the true IDC is actually lower than 82%.

On the second point, whilst agreeing that full static is not a good idea, I disagree on the reason. Injectors don?t fail due to overheating - modern injectors are cooled by the fuel running over them and can do high IDCs, in fact are designed to. The danger comes in with what fuel is required at what RPMs. If you?ve maxed the injectors out at say 6000 RPMs at an IPW of 20ms, which provides you with an absolute amount of fuel (related to the cc / minute) that the injectors are rated at, and you continue up the RPM scale (and hence require more grams per second of air, and hence more fuel) you will lean out ? since the injectors cannot flow more than being fully opened.

It's great fun... anybody want to join me? :twisted:

 

[Z1107]

Nasioc posted one recently, then there was an online article from a British auto enthusiast publication can't remember the name. I have it saved on my PC but it's in storage. There is slot of stuff online from auto sites.

 

[DownforceTom]

What's up in here?

 

[Z1107]

This thread isn't as active as it once was, due to the chatbox, thats where everyone is probably at.

 

[IGOTASTi]

They have become chat whores, lol.