<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbo-charged &raquo;</TD></TR><TR><TD CLASS="quote">your not fully depressing the clutch, just enough to change the pressure in the line.</TD></TR></TABLE>

thers many ways of doing it.

we actually fully clutch in/out. it helps with shifting ALOT, ive never missed a shift after doing it this way, when i used to miss 3rd every once in a while (synchros worn).

 

when i had a trans in my car that was sketchy i did something very similar while using the clutch and you are right, it def. helps with the shifting. i imagine it would be even more helpful on a H tranny.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jjspec &raquo;</TD></TR><TR><TD CLASS="quote">Not to jack your thread but show me a strain gauge. I would really like to see one!</TD></TR></TABLE>

Jimmy,
It's acts like a resistor basically. It's tough to explain so here are some pics....




If you want to get a cheap strain gage take apart a computer joystick.... some of them use strain gages to monitor stick position and feed it back to the PC....

And for the record it's strain gage not gauge.... lol

 

OK. Thanks. I feel like depressing some clutch. I think I will air up the tire in my dd and take it for a spin. That does make sense-less power=easier shift.

 

it sounds like what you guys are doing isn't really making anything faster. I don't think dave wants to touch his clutch after the car has launched. This is for dog trans that does not require a clutch just an interupt in power to change gears.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tepid1 &raquo;</TD></TR><TR><TD CLASS="quote">

Jimmy,
It's acts like a resistor basically. It's tough to explain so here are some pics....


If you want to get a cheap strain gage take apart a computer joystick.... some of them use strain gages to monitor stick position and feed it back to the PC....

And for the record it's strain gage not gauge.... lol

</TD></TR></TABLE>
Thanks. I have heard the term for a while just never have seen one. I appreciate you showing a pic.

 

No problem man. Google pics FTW!

 

Ok. So heres the deal, things you need, strain gauge, ems capable of reading input signal, ems with output signal and of course a decent ign box. Heres an example set up.

EMS
Strain Gage
MSD 7530(I think maybe mr. hicks can chime in)

Basically the strain gage sends a voltage signal to the EMS, which in turn send a signal to the MSD box. The msd uses its built in rev limiter to "unload" the motor, but at the same time keeping boost numbers up. There is alot more to setting it up, but this is the basic system. I beleive you should be able to get this to work with most EMS's as long as they have add. inputs and outputs. I have wiring diagrams somewhere, as I'm doing a similair setup on my talon, I'm setting it up with full throttle shifting(no lifting or clutching), timed boost control, boost launch control, and progressive n2o control. hopefully it will allow me to get the car pretty consistent.

 

Or you can just buy an EMS that does it all and then just modify the shifter to read the strain signal.

 

no offense but I wouldn't trust aem to run my ign, let alone my ign interupt. anyhow, for what its worth eggum racing used the exact setup i listed. so i guess it works hey?

and the shift doesn't read the strain signal. the strain gage is installed in the shifter(usually in the shift lever) it has a processor that sends a voltage signal out. so you need something to interpet the signal, wether thats an ems or some sort of kill box.

 

Who said anything about AEM? lol That's junk in my opinion.

There are a few different ways that you can use a strain gage. The most common way is to affix the film sensor on the shifter and once it sees a deflection it alters resistance (which causes a change in voltage and current) and the EMS reads that. Based on the voltage limits setup in the EMS you can have it trigger under almost any stress.

It's a really simple circuit.... if this is correct....


It's a simple op-amp circuit. The only thing I don't understand is where the op-amp feedback line is getting a signal from. I would have expected it to use feedback from the sensor.

There are also strain gage pressure sensors. That's a whole new ball game though.

This has gone a bit off topic. lol

 

why don't you just use the upper rev limiter when ever you hit it shift and the rpm will come back down with the gear change just set your shift light a few 100 rpm before the limiter to let your body react

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bob menuts &raquo;</TD></TR><TR><TD CLASS="quote">why don't you just use the upper rev limiter ......just set your shift light a few 100 rpm before the limiter to let your body react </TD></TR></TABLE>

you wont get the same <U>consistancy</U> out of it like you would on something that sense's how much pressure your arm is putting on the shift lever.


Tepid- on your pictures, there is the actuall straingage, and then there is another box with it, what is that box for? an amplifier ? (the "straingage bridge" )

G2K- from what i understand, they had to write a program for thier particular ems that would inteperate the signal from the straingage, and know what to do with it? can you explain any further ?

 

Which 'box' are you talking about Dave? The triangle or the other side of the dsub connector 'J1'?

This circuit is wired up so that it is looking at the delta, or the difference, between the two signals. It's using a fixed resistor in parallel with the strain gage. The strain gage being the variable. Based on the delta, it drives a signal to the ECU.

I wouldn't use this setup for a car. This was drawn for other reasons. I would use the op-amp a bit differently so that it only needs one input to the ECU.

 

just use a pressure switch in your line if you dont have a programmable ecu . Our kill unit needs to be powered up. SO when your driving around just dont turn the switch on and it wont do anything. When you get to the track flip it on and everytime it sees a ground input it will kill the ignition.

 

I'm pretty sure Jeromie did have theirs connected to the launch rev limit, thats what I understood from a couple of conversations with him. I don't think it was an actual ignition cut. We use the motec ignitin cut feature.

 

got some good news back from Matt @ cycle-tek.com
http://www.cycle-tek.com/html/completesys.html

Hi Dave,

It has to see a ground signal. Sure, I sell a lot of my kill boxes separately, they're $95 plus $10 for shipping and paypal fees if using paypal. In stock and ready to rock!

Thanks
Matt

 

Dave,

Just curious, but why are you looking into these ign cut boxes? Doesn't your current EMS support all that? Or are you going a different route (noticed your FS posts)?

 

dave has a twisted mind- he is always thinking of SOMETHING

 

haha

I can't disagree with that.

 

either of you 2 smart ***'s want to put my ideas into action ? (im kidding)


just trying to figure some stuff out and learn in the process

 

haha

It's all good. We all appreciate the post with the links for reference. Not too many people take the time and share info like this.

for the Fry guy.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaveF &raquo;</TD></TR><TR><TD CLASS="quote">either of you 2 smart ***'s want to put my ideas into action ? (im kidding)


just trying to figure some stuff out and learn in the process </TD></TR></TABLE>
I thought your guinea pig was a solid color(gold)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jjspec &raquo;</TD></TR><TR><TD CLASS="quote">
I thought your guinea pig was a solid color(gold)
</TD></TR></TABLE>

WTF is that ? I think its bigger than my dog

 

It is a guinea pig with a racing stripe on the front, haha.