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Old 08-02-2001, 09:03 PM   #1
davidm_sh
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Default Hey LARRY!?

Ok I got some questions for ya =). I have on order/group buy a VF22 and my 3" Brullen exhaust. HOPEFULLY will be here end of this week/next week.

ANyway with the new turbo especially my mind has been wandering about what I am going to do to monitor my engine and more specifically my duty-cyles on the injectors. One thing that caught my eye was the AVC-R. It has precisely a injector duty cycle feature along with it's 60seconds of data logging I was thinking this might not be such a bad idea. BUT I was wondering if this is actually worth anything. I mean what is the sampling rate/resolution of the data the AVC-R? Is it usable and somewhat usefull and realiable to go off of? Or is it just another marketing "blinking/pretty" light =)? I really like the features of the unit and was just wondering what your opinion of it was. I ask becuase I was under the impression that you are using one or have or somthing =)?

While I was at it I also did a bit of research into the S-AFC and was wondering if this would be worth anything with how rich the WRX's supposidly run. But as I thought about it more I figured I want to tune the car to the edge of maxing out the stock injectors anyway so I don't think I would need to lean out the mix any more =).

Thanks.
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Old 08-02-2001, 11:16 PM   #2
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OBD2 sux doesn't it?

I looked at all the data loggers in hopes that just maybe they might capture that info but they don't.

Myself and an EE buddy of mine are gonna start working on a digital gauge panel "thingy" (technical term) to capture some en route to the ECU instead of the mostly worthless garbage that gets dumped to the OBD2 port.

Using several probes wired up to a data acq board, I'm hoping we can get EGT, some sort of injector info(IDC preferably), and one other parameter (knock??, depending on the signal processing that it goes through to make it understandable) all conveniently displayed via you palm OS device.

This was just tossed around today, but he has done some similar stuff with his RX7. I think the conversation today got him a little more excited about things so we can get started on it.

No promises, but we're gonna see where this one goes.

-jay
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Old 08-02-2001, 11:43 PM   #3
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Hey if you need any kind of help EE/CprE wise I am a pretty decent C programmer along with being a computer Engineer. I also have resources to a LOT of other EE's knowledge.

Just wondering. You never really said specifically but what exacally was wrong with the AVC-R from Apex. I remember somebody posted the wiring diagram breakdown of the ECU and I saw each cyclinder fuel injector duty cycle.

Here is what I was looking at. From what Apex's site said you would tap into one of the four injector signals for the AVC-R. But what do I know =).

http://www.scoobymods.com/mods/wrx/wrxpin.php
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Old 08-03-2001, 12:02 AM   #4
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Quote:
Originally posted by davidm_sh

Just wondering. You never really said specifically but what exacally was wrong with the AVC-R from Apex. I remember somebody posted the wiring diagram breakdown of the ECU and I saw each cyclinder fuel injector duty cycle.

See your earlier post in "Factory Turbo Powertrain" regarding the price.

Even though I sold my Galant VR-4 last nite, I'm still a cheap ass DSM'er and that'll probably never change. Good ol fashion research and DIY is something that I firmly believe in when it comes to modding cars. Besides, it's a helluva lot funner IMO.

-jay
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Old 08-03-2001, 12:05 AM   #5
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Not saying it's much cheaper but groupbuycenter.com has them for $399 compared to the normal price of $599. Hey it's 200 cheaper =).
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Old 08-03-2001, 10:11 AM   #6
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Default injector size

David -

<i>But as I thought about it more I figured I want to tune the car to the edge of maxing out the stock injectors anyway so I don't think I would need to lean out the mix any more =).
</i>

The stock injectors flow around 40lb/hr. This should be enough for 17 lbs of boost or so on the 2.0. Do you have a rich/lean meter? I don't remember. If not, get one if you plan on going to this level. (I'm sure you already know this.)
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Old 08-03-2001, 10:42 AM   #7
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Hey Diz,

Yah I have a A/F and EGT BUT my A/F is not hooked up to the 0-5V O2 sensor right out of the engine but instead on the 0-1V sensor on the 3rd cat soon to be second cat =). So I don't really trust it That much but it's better than nothing I suppose.

I also heard Shiv or Imprezzar say that the stock injectors max out around 16.5psi with the VF22 so you are about right there I think. I have heard people say the VF22 is amazing at just 14psi ... maybe so for mere mortals but my NEEDS (not wants mind you) are not mortal [heh].
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Old 08-03-2001, 11:12 AM   #8
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So why not just go ahead and get some 550's and an tune them with an AFC? Those should be fine into the low low 12s as long as the pump can keep pressure up enough.
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Old 08-03-2001, 11:36 AM   #9
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You make it sound like it's so easy to get ahold of these 550cc injectors =). Show me the place and price and I will have NO hesitations about getting them. But as far as I understand it the 420cc injectors that are on the car already are new and "specialy" made top-mount or somthing ... but anyway show me the injectors =).
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Old 08-03-2001, 11:45 AM   #10
phast
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I'm still trying to figure out what they are.

At first I thought the Supra side feed 550's would work, but no go.

Then it sounded like there were no stock cars that came with bigger injectors that would work with our car.

I may have found /something/ but I want to make sure first. FD RX7 550's being that something. I gotta do some digging, but I should have my findings by the end of the day.
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Old 08-04-2001, 03:12 AM   #11
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The designer of the JCS torque chip is doing a duty cycle gauge already, and he has a WRX torque chip to fix fuel and remove the fuel cut at 17 psi. That is what I what get.

Imprezer is maxed out on his injectors by 5,000 rpm with the VF22 and stock injectors!!

Larry
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