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Search took 0.01 seconds. Search: Posts Made By: Occasionally6
Forum: EcoModding Central 02-02-2019, 05:39 PM
Replies: 46
Views: 6,273
Posted By Occasionally6
For several years I have been using a relay...

For several years I have been using a relay connected in series with the A/C switch and activated via an R-C based timer triggered by a switch on the brake pedal. This means the A/C can be on only...
Forum: DIY / How-to 03-29-2018, 09:04 PM
Replies: 24
Views: 4,749
Posted By Occasionally6
Most likely the ECU earths the switching side of...

Most likely the ECU earths the switching side of the cooling fan relay. The way to check is to find the wire from the relay into the ECU and measure the voltage present with respect to a ground - all...
Forum: Off-Topic Tech 12-25-2017, 04:31 AM
Replies: 6
Views: 1,488
Posted By Occasionally6
To address the OP, How to MakeYour Car Handle by...

To address the OP, How to MakeYour Car Handle by Fred Puhn has a few pages on Anti Roll Bar (ARB) design. Included is a figure with a mathematical formula for calculating the spring rate of a...
Forum: General Efficiency Discussion 12-10-2016, 10:22 PM
Replies: 66
Views: 10,461
Posted By Occasionally6
Apparently not (enrichment) : Ford’s new...

Apparently not (enrichment) : Ford’s new 1.0-L EcoBoost I3 is big on low-friction technology - SAE International (http://articles.sae.org/10714/)

Power density was the biggest single R&D...
Forum: The Lounge 10-24-2015, 08:11 PM
Replies: 15
Views: 2,128
Posted By Occasionally6
Don't neglect this bit: A simple...

Don't neglect this bit:



A simple repaint of a bumper can cost a few to several hundred dollars, let alone a more complex repair.
Forum: Instrumentation 07-28-2015, 04:41 AM
Replies: 12
Views: 2,897
Posted By Occasionally6
It's been asked before. If you have a throttle...

It's been asked before. If you have a throttle position sensor that generates a voltage that varies with throttle position you can do this:
...
Forum: Aerodynamics 07-28-2015, 04:35 AM
Replies: 19
Views: 2,394
Posted By Occasionally6
Would a camera attached to a kite towed behind...

Would a camera attached to a kite towed behind the subject car be a simpler/cheaper solution?
Forum: EcoModding Central 07-09-2015, 04:22 PM
Replies: 20
Views: 3,333
Posted By Occasionally6
Maybe just drop the boost pressure? ...

Maybe just drop the boost pressure?



From a psych chart, here:

https://lehighcheme.wordpress.com/2013/11/23/psychrometric-chart-2/

If the ambient air is at 25C and 60% RH and cooled to 5C...
Forum: EcoModding Central 07-05-2015, 04:38 PM
Replies: 7
Views: 1,295
Posted By Occasionally6
Maybe model the air in the tire as the difference...

Maybe model the air in the tire as the difference in volume between two cylinders and use P.V = m.R.T. Plug in the numbers and see what the difference in pressure works out to be.
Forum: DIY / How-to 06-30-2015, 02:27 PM
Replies: 5
Views: 2,619
Posted By Occasionally6
These may be of use: Lab: DC Motor Control...

These may be of use:

Lab: DC Motor Control Using an H-Bridge | ITP Physical Computing (http://itp.nyu.edu/physcomp/labs/motors-and-transistors/dc-motor-control-using-an-h-bridge/)

Bipolar...
Forum: DIY / How-to 06-28-2015, 06:45 AM
Replies: 5
Views: 2,619
Posted By Occasionally6
The shutter motor operates at 3V so you need to...

The shutter motor operates at 3V so you need to organise that whatever else you do. That's easy with a voltage regulator fed with "12V".

Then you want the shutter motor to operate for long enough...
Forum: Instrumentation 04-02-2015, 06:04 PM
Replies: 6
Views: 1,570
Posted By Occasionally6
In another thread I have posted a simple circuit...

In another thread I have posted a simple circuit that does this. Yes, it works! <$20. The proviso is that the MAP signal puts out a 0-5V signal.

An alternative is to connect the voltage divider to...
Forum: Off-Topic Tech 03-12-2015, 08:18 AM
Replies: 9
Views: 3,332
Posted By Occasionally6
In this type of system, the pressure difference...

In this type of system, the pressure difference between fuel and inlet manifold is held constant.

There are other - returnless - systems in which the ECU compensates for the pressure difference....
Forum: The Lounge 03-12-2015, 08:05 AM
Replies: 20
Views: 3,292
Posted By Occasionally6
In my experience, they all do it. Many people...

In my experience, they all do it. Many people will initially shop around for the best deal then simply renew, paying whatever is asked for the new policy.

I've also found the exact quote can vary...
Forum: EcoModding Central 03-10-2015, 06:36 AM
Replies: 46
Views: 6,031
Posted By Occasionally6
There's nothing wrong with the concept but take a...

There's nothing wrong with the concept but take a look at the section and wall thickness of those cars (with safety cages). They're not even close to equivalent to 2"x2"x1/4" and they're not using...
Forum: EcoModding Central 02-19-2015, 04:12 AM
Replies: 28
Views: 5,145
Posted By Occasionally6
Yep. Also, check (measure) the reference voltage...

Yep. Also, check (measure) the reference voltage in the car and what you are using match. The reference voltage is what is across the CTS connector with the sensor disconnected.



The sensor...
Forum: EcoModding Central 02-16-2015, 05:41 AM
Replies: 28
Views: 5,145
Posted By Occasionally6
You can measure the voltage from the CTS that the...

You can measure the voltage from the CTS that the ECU reads. It will be a nominally 0-5V signal wrt ground/earth.

If you want, you can calibrate sensor voltage against an actual temperature with...
Forum: Hypermiling / EcoDriver's Ed 01-10-2015, 04:23 AM
Replies: 80
Views: 11,807
Posted By Occasionally6
Re. AC: The AC doesn't just cool the air...

Re. AC:

The AC doesn't just cool the air passing through the evaporator, it heats the air passing through the condenser. That may help a little in warming the radiator (at least) and with the same...
Forum: EcoModding Central 01-10-2015, 04:12 AM
Replies: 90
Views: 13,274
Posted By Occasionally6
You might like to consider the amount of heat...

You might like to consider the amount of heat being rejected in the exhaust. At idle, 1.0l/hr might be typical. Using ~0.75kg/l and 43MJ/kg the rate of heat energy release is about 9kW. About a third...
Forum: Aerodynamics 01-10-2015, 03:37 AM
Replies: 12
Views: 3,154
Posted By Occasionally6
Sometimes Coroplast or cardboard won't do :). ...

Sometimes Coroplast or cardboard won't do :).

As sheet steel and wood are relatively inexpensive, were I wanting sheet steel skirts I'd have a go at making them myself. There'd be few simpler...
Forum: DIY / How-to 12-13-2014, 05:37 PM
Replies: 15
Views: 5,280
Posted By Occasionally6
The following might be useful: The Jaycar...

The following might be useful:

The Jaycar DFA is one of three similar units.

A Digital Pulse Adjuster - PWM signal in, altered PWM signal out with the PWM input frequency the same as the...
Forum: DIY / How-to 11-14-2014, 06:20 PM
Replies: 41
Views: 10,869
Posted By Occasionally6
With chopped strand mat? Fibreglass cloth is much...

With chopped strand mat? Fibreglass cloth is much easier to drape over complex surfaces. Two layers offset at 45 degrees are necessary if you want ~anisotropic properties.

Perhaps it's worth some...
Forum: Instrumentation 09-27-2014, 04:53 AM
Replies: 10
Views: 4,009
Posted By Occasionally6
The premise behind watching manifold...

The premise behind watching manifold pressure/vacuum is to increase engine efficiency. That's not the same as the absolute quantity of fuel being used.

That manifold vacuum drops when climbing a...
Forum: EcoModding Central 09-12-2014, 11:28 AM
Replies: 17
Views: 2,176
Posted By Occasionally6
Perhaps something like this: 32x16 Red Dot...

Perhaps something like this:

32x16 Red Dot Matrix Display | Freetronics (http://www.freetronics.com/products/dot-matrix-display-32x16-red#.VBMN0V5-_IU)
Forum: Instrumentation 09-10-2014, 07:03 AM
Replies: 4
Views: 1,406
Posted By Occasionally6
Absent forced induction, the maximum, achieved at...

Absent forced induction, the maximum, achieved at wide open throttle (WOT), will be close to the local atmospheric pressure i.e. ~100kPa. Perhaps a little less at high engine power outputs (high MAP...
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