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Showing results 61 to 90 of 178
Search took 0.01 seconds; generated 99 minute(s) ago. Search: Posts Made By: arghx7
Forum: Engine, Exhaust, Transmission 01-21-2014, 01:22 PM
Replies: 150
Views: 57,515
Posted By arghx7
Just keep in mind guys that people measure their...

Just keep in mind guys that people measure their cam durations and lift like they measure their junk. The bigger number is always better, and nobody's sure exactly how the ruler was positioned.
...
Forum: Engine, Exhaust, Transmission 01-21-2014, 10:52 AM
Replies: 150
Views: 57,515
Posted By arghx7
Also, please release Intake Valve open event...

Also, please release

Intake Valve open event @ 1mm lift (or .05" if you want to do it that way)
Intake Valve Close event
Exhaust Valve Open event
Exhaust Valve Close event

Cam centerlines at...
Forum: Engine, Exhaust, Transmission 01-16-2014, 01:31 PM
Replies: 72
Views: 230,655
Posted By arghx7
Here is some stuff on cold starts on this engine...

Here is some stuff on cold starts on this engine (coolant temperature around 23C), originally posted as part of this thread: http://www.ft86club.com/forums/showthread.php?t=55676
These charts and...
Forum: Engine, Exhaust, Transmission 01-14-2014, 09:59 PM
Replies: 408
Views: 202,139
Posted By arghx7
A couple more... based on what I am seeing so far...

A couple more... based on what I am seeing so far in this log, the AVCS isn't really doing anything in the starting process. Keep in mind that coolant temperature is about 23C. It might behave...
Forum: Engine, Exhaust, Transmission 01-14-2014, 07:44 PM
Replies: 408
Views: 202,139
Posted By arghx7
http://www.ft86club.com/forums/attachment.php?atta...

http://www.ft86club.com/forums/attachment.php?attachmentid=63445&stc=1&d=1389742684

Here's how you can divide the cold start up. You have cranking, run up, flare, then a transition to catalyst...
Forum: Engine, Exhaust, Transmission 01-14-2014, 05:22 PM
Replies: 408
Views: 202,139
Posted By arghx7
Maybe mad_sb can post his logs and I can make...

Maybe mad_sb can post his logs and I can make some charts to explain a little further. You can go second-by-second and divide a cold start into different sections with different priorities for...
Forum: Engine, Exhaust, Transmission 01-14-2014, 01:52 PM
Replies: 408
Views: 202,139
Posted By arghx7
Yes. It has AVCS on intake and exhaust cams....

Yes.

It has AVCS on intake and exhaust cams. Basically, a hydraulic cam phaser moves the cam centerlines. Intake cam can be advanced from the most retarded position, and exhaust cam can be...
Forum: Engine, Exhaust, Transmission 01-14-2014, 11:00 AM
Replies: 408
Views: 202,139
Posted By arghx7
High RPM & retarded spark provide heat to warm up...

High RPM & retarded spark provide heat to warm up the cat. -15 degrees (BTDC firing, so 15 ATDC firing) is about average spark retard on a modern direct injected engine during cold start. I'd have...
Forum: Software Tuning 01-07-2014, 12:03 PM
Replies: 135
Views: 32,856
Posted By arghx7
Since this is a broad-open ended question, here's...

Since this is a broad-open ended question, here's what I can say. This is based on what's been publicly posted about how Subarus drive by wire and engine control systems work.

It could be called...
Forum: Software Tuning 12-18-2013, 04:51 PM
Replies: 7
Views: 5,099
Posted By arghx7
Can you explain how the DI + Port fuel mapping...

Can you explain how the DI + Port fuel mapping and control logic works? On the most basic level: is it pulsewidth and fuel pressure lookup tables? Or does it calculate a fuel quantity and then...
Forum: Software Tuning 12-09-2013, 10:04 PM
Replies: 12
Views: 5,974
Posted By arghx7
Keep this in mind: When your exhaust cam is near...

Keep this in mind: When your exhaust cam is near its most advanced point, and your intake cam is near its most advanced point, you have early overlap. By early overlap, I mean that as the piston...
Forum: Software Tuning 12-08-2013, 11:41 PM
Replies: 12
Views: 5,392
Posted By arghx7
All that spark advance is due to slow combustion....

All that spark advance is due to slow combustion. Part of the reason for the slow combustion is the cam phasing/overlap diluting the mixture.

As I mentioned in this post...
Forum: Software Tuning 12-07-2013, 09:26 PM
Replies: 23
Views: 14,918
Posted By arghx7
We're all familiar with knock retard in the sense...

We're all familiar with knock retard in the sense that we understand the ECU pulls timing based on the sensor signal. Allow me to provide a little background on false knock detection from the...
Forum: Software Tuning 12-03-2013, 11:06 PM
Replies: 40
Views: 33,468
Posted By arghx7
A lot of the practical concerns have already been...

A lot of the practical concerns have already been discussed here. To summarize: the MAF sensor was never designed for very high airflow, and the ECU software as we understand it was never really...
Forum: Engine, Exhaust, Transmission 11-24-2013, 10:01 PM
Replies: 58
Views: 26,906
Posted By arghx7
Well I'd have to see the exact text here. NA...

Well I'd have to see the exact text here. NA engines simply can't get more than maybe 16-17 bar IMEP (work before pumping and friction is subtracted). Boost can do a lot more than that, but has...
Forum: Engine, Exhaust, Transmission 11-24-2013, 05:52 PM
Replies: 58
Views: 26,906
Posted By arghx7
You're talking about three different things:...

You're talking about three different things: ignition delay (0-10% burn time), combustion speed (10-90% burn time), and combustion phasing for MBT.

In the ECU you set the spark timing. That's...
Forum: Engine, Exhaust, Transmission 11-24-2013, 01:13 AM
Replies: 58
Views: 26,906
Posted By arghx7
Adding timing, or adding boost in the case of...

Adding timing, or adding boost in the case of forced induction. You can listen for it but most of the time with a stock ECU it's just a matter at looking at what the knock control system is doing
...
Forum: Engine, Exhaust, Transmission 11-23-2013, 03:40 PM
Replies: 58
Views: 26,906
Posted By arghx7
Here's something to check out. It's from a Ford...

Here's something to check out. It's from a Ford study of using dual fuel pump gas + E85 capability in an 3.5L Ecoboost engine with PFI and DI. Ford Ecoboost E85 Study...
Forum: Engine, Exhaust, Transmission 11-23-2013, 10:25 AM
Replies: 58
Views: 26,906
Posted By arghx7
One thing people don't realize is that when you...

One thing people don't realize is that when you run E85 or race fuel cylinder pressures can go way up with enough spark advance. I know that sounds strange--say you have 300whp (or 300wtq) on E85,...
Forum: Software Tuning 11-14-2013, 08:40 PM
Replies: 66
Views: 44,946
Posted By arghx7
How often do you put in E10? Every other tank? ...

How often do you put in E10? Every other tank? Once a month? One time since you initially switched to E85? Or have you literally run only E85 that entire time?

The reason why I ask is because...
Forum: Software Tuning 11-12-2013, 07:42 PM
Replies: 14
Views: 9,284
Posted By arghx7
Of course there are concerns about fuel system...

Of course there are concerns about fuel system life. A lot of the vendors promoting their E85 tunes *cough*Visconti*cough* just swept those aside. Lots of people are running E85 at least...
Forum: Software Tuning 11-07-2013, 07:43 PM
Replies: 31
Views: 40,238
Posted By arghx7
It could be as simple as adjusting the fuel flow...

It could be as simple as adjusting the fuel flow delivery higher or lower, and setting the split according to that mean injection split map. That would eliminate the need for separate trims. Or it...
Forum: Software Tuning 11-07-2013, 12:02 AM
Replies: 31
Views: 40,238
Posted By arghx7
It's hard to say. We're going off an...

It's hard to say. We're going off an advertisement. They are describing a very late port injection timing, which is normally terrible for HC emissions unless you're very careful with AVCS. And we...
Forum: Software Tuning 11-06-2013, 11:28 PM
Replies: 75
Views: 25,816
Posted By arghx7
In my experience, race fuel basically eliminates...

In my experience, race fuel basically eliminates LSPI. It's mostly a pump fuel phenomenon. Ethanol is a different beast--in some ways it has its own unique tendencies.



I'd have to look...
Forum: Software Tuning 11-05-2013, 09:50 PM
Replies: 75
Views: 25,816
Posted By arghx7
I know you're not the OP but I'm going to address...

I know you're not the OP but I'm going to address your posts because it is still relevant. I downloaded your logs and made some plots.
...
Forum: Software Tuning 10-30-2013, 11:27 PM
Replies: 41
Views: 13,713
Posted By arghx7
What the maps mean and how values are calculated...

What the maps mean and how values are calculated for engine operation are pretty different from some low-level hardware stuff. The controls are handled by the guys tuning the car, and the ECU...
Forum: Engine, Exhaust, Transmission 10-22-2013, 09:44 PM
Replies: 11
Views: 3,372
Posted By arghx7
Dude. That's what rental cars are for.

Dude. That's what rental cars are for.
Forum: Software Tuning 10-21-2013, 07:50 PM
Replies: 35
Views: 20,210
Posted By arghx7
For posterity's sake, here is the info from...

For posterity's sake, here is the info from mad_sb , who has done a great job contributing to this forum.

Here is the original thread: ...
Forum: Software Tuning 10-19-2013, 01:42 PM
Replies: 35
Views: 20,210
Posted By arghx7
I'd like to point out some principles of throttle...

I'd like to point out some principles of throttle design, pedal mapping, and torque control calibration: Throttles are inherently non-linear due to the laws of physics. Cable-driven throttles from...
Forum: Software Tuning 10-17-2013, 11:19 PM
Replies: 41
Views: 13,713
Posted By arghx7
I'm not an expert on the minutiae of how that...

I'm not an expert on the minutiae of how that kind of low-level handling of data occurs on a production controller (stock ECU that comes on your car). On a $10k prototype ECU, yes that's true for...
Showing results 61 to 90 of 178
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