speedjunkie

iTrader: (3)

I wasn't sure where to put this since it's about two different things, so here goes...

1. I bought a Supra fuel pump from someone here on the forum several months back, and I just got around to putting it in recently and noticed the numbers on top were ground off. I looked at the stock pump and of course those numbers/markings were still visible. The only difference was the plastic on top of the Supra pump was black and the plastic on my stock pump was brown, but I figured that could have varied from year to year. So my question is, are there any other identification markings on the pump that I can make sure it's a Supra pump and didn't get ripped off?

2. I installed my AVC-R today (also bought used from a forum member here), and when I turned the key to show the APEX'i opening on the control box, nothing came on. You have to hold down one or any of the buttons on the control box to make anything come up on the screen, so needless to say I wasn't able to initialize and set it up for my application, and now I'm back to not boosting for fear of messing something up. Now, there is an orange wire on the harness side of the connection coming from the control box that isn't hooked up to anything, and I'm assuming it's the Scramble Boost wire, which I read is optional. But I'm wondering if maybe it's supposed to be grounded if it's not used and if maybe that's why I'm not getting anything on the screen. Has anyone had this problem before?

Can anyone answer either of these questions?

dhays

iTrader: (1)

I've not had the problem but the orange wire doesn't need to be grounded. I'd just make sure that you taped up the end so it won't ground on anything.

Double check your wiring, both where you wired it and the connections. Make sure that the two grounds are in the proper place with the green closer to the ECU than the black.

Good luck.

speedjunkie

iTrader: (3)

I know it's not grounding out cause I had it in my hand half the time, but I'll tape it up none-the-less. And I did check my wiring again before I put everything back but I'm going to go back and check again. And I DEFINITELY made sure to put the green wire closer to the ECU on the grounding wire, as big a deal as they made out of that haha.

I was actually looking at your thread when I was getting ready to do the installation. Thanks for the input.

dhays

iTrader: (1)

See, paying attention to anything that I write is your first mistake.

Good luck with it. I doubt that the AVC-R has gone bad on you since it is all solid state electronics. My guess is a small wiring problem.

FWIW, when I first installed mine the rpm it gave was off by 500-700 rpm. I rechecked my hack-job of connecting that wire and then it started to work just great.

speedjunkie

iTrader: (3)

Haha, I'll take note not to ever listen to you again then...starting now. LOL I guess my task is to go back over wiring then. Fun fun.

arghx

iTrader: (3)

Is there no part number on the Supra pump?

speedjunkie

iTrader: (3)

That's what I'm asking, the numbers on the one I bought were all ground off. One of the previous owners filed off the numbers on top, which makes me suspicious that it's just a stock pump sold as a Supra pump.

speedjunkie

iTrader: (3)

Alright, I went back over my wiring last night. I did continuity checks from the ECU connectors to the connector that plugs into the control box. The black grounding wire wasn't connected fully, along with possibly a couple other wires. After fixing those problems I did a continuity check and all were good. I hooked it up again and it still had the same problem. I opened up the control box to see if maybe something was fried and it looked fine. While it was open I did a continuity check on all those wires and they were fine too. A guy here in town is going to let me use his box to see if that's what the problem is, so I'll post again after that.

Still wondering about the fuel pump too.

dhays

iTrader: (1)

Good job on checking all the wiring. You've already taken the next step I could think of which was to get another box to test out. It may be the unit is fried however unlikely that seems to me. Let us know what happens.

NvIs

I don't post here much nor do I even own a rx7, but my friend has a MK IV supra. When we first installed the AVC-R, it had the same problem as yours. I turns out the ground wasn't connected right. After we connected the ground it was fine. I've read the if the AVC-R isn't grounded correctly damage may occur to the unit or car. Nothing happened to the supra and the AVC-R was fine.

drga55

The person that you bought the pump from might not have been the one who grinded off the numbers. I know some comanies that sell the denso pump grind the numbers off because they want you to buy a replacement pump from them rather than finding the pump from another distibutor. If you have the number on the pump it makes it easier to find the pump from another source than from the company that you orginally bought it from. As far as how you can tell what it flows, the only way that I can think of is try and contact someplace like RC engineering. If I am not mistaken they had the service to flow fuel pumps as well as injectors.

speedjunkie

iTrader: (3)

Well the guy that's letting me use the box wants to sell his too cause he got it from a friend, supposedly brand new, but one of the solenoids was missing. So he told me he'd sell me the box for $220 but if I do that I'll end up spending $520 on something I could have gotten brand new for $400 or less. So I'm HOPING it's not the box.

Well I'll check the grounds again but they were both working fine last night. I have the green wire connected closer to the ECU than the black wire, like it's supposed to be, so who knows. I did notice tonight that when I press the button to make the screen light up, it drops the RPMs momentarily and the same happens when you let off the button, only it dips down even more, almost like it's going to stall. However, that doesn't really tell me much since it wouldn't even be an issue if the box was working, haha.

Yeah I didn't think about that. Hopefully that's the case. I finally installed my SARD FPR again last night and I tried to adjust the fuel pressure below ~45 but I can't, so I'm thinking maybe it IS a Supra pump after all. I had read it's supposed to be 36psi at idle and 38psi under throttle.

Thanks everyone for your input. If you guys can think of anything else, or if anyone else has input, my ears are still open.

drga55

You should be able to cause i just installed my supra pump and i have my SARD regulator set to 36-38 psi at idle.

speedjunkie

iTrader: (3)

Hmm, not sure what to say about the pump then. I was adjusting it down while it was running yesterday and it wouldn't go below ~45-50psi.

As far as the AVC-R, I think I have it figured out. The black ground wire from where it hooks to the ECU to where it connects to the control box must have an open in it somewhere cause I checked continuity and I'm not getting anything. I'm gonna jump it tomorrow and see what happens.

dhays

iTrader: (1)

I hope that is it. It would be a simple solution.

speedjunkie

iTrader: (3)

Yeah I was sitting in the 7-Eleven parking lot troubleshooting with my multimeter last night (long story of why I was there), and the battery in the meter went dead, so I went inside to get one and it was the only battery they didn't have. Damn Friday the 13th haha.

I'll post up my results.

speedjunkie

iTrader: (3)

OK, I jumped the black grounding wire all the way from the rear of the ECU to the connector for the control box, and it works. Although I don't think that wire was bad anyway cause I did a continuity check on it before that and it was fine. I suspect the terminals for the black wire in the connector weren't making contact. I messed with the terminal on the ECU side of the connector and it worked (after jumping it with the wire so it's hard to say).

But now I'm wondering if something else is wrong with it because when I tried to initialize and set all the settings back to default, I don't think it worked. I still need to go through the whole system though and see how everything works. And I think I have a boost leak too cause with the controller off I'm only getting around 5 psi instead of 7. So the saga continues.

arghx

iTrader: (3)

is this on stock twins stock ECU? single turbo? if you have stock sequential twins and PFC you should be able to control boost with no problems from the PFC as long as everything is hooked up right.

speedjunkie

iTrader: (3)

Stock twins, APEX'i PFC. When I first rebuilt the engine and got it in (back in March when I was still in Fayetteville, NC btw), it ran like a beast. When I finished with the break-in period, it was boosting 15psi cause I didn't have a controller and it kinda scared me cause I didn't want anything to go wrong, but it was a MONSTER. Within a couple weeks, when I was on my way out here to CO, I had lost that power but didn't really notice it so much at first so I thought it was just due to the altitude. The other day when I was putting in my FPR, I noticed the line going from the UIM to the brake booster line had a huge slit in it and I've replaced that. A couple weeks ago I thought I heard a boost leak but I hadn't heard it before and it's still hard to hear sometimes cause I tend to think it's just the turbos spooling. I bought a tester kit from Fighter's Garage though and I'm going to use that to check it.