DIYPNP Seq_Inj Mod Installation on a 97 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-18-2010, 11:20 AM   #1
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Default DIYPNP Seq_Inj Mod Installation on a 97

Okay so I'm trying to add in the Sequential Injection... At first I was confused because I was going off a diagram of the older diypnp board, and I was also under the impression(due to a lack of reading) that the add on was to be mounted ON the proto area, but now I understand 'over' the area, from the 10 pin header on the main board.

So, in the attached pic you can see where the in the 10 pin area, the 12v and SG are attached to 11 and 9. 12v - Red, SG - Yellow.

Do I maintain these connections after adding in the header for Seq_Inj mod board, or do they need to be routed elsewhere?

To start with, I'm not very good at soldering, so I'd like to try to get this right on the first go around.

So if anyone has some helpful information please feel free to chime in, as I'm sitting here ready to do this sometime this morning. In the mean time I'll be watching youtube videos on soldering and skimming msextra.com

Thanks very much!
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DIYPNP Seq_Inj Mod Installation on a 97-v15topuse10pin.jpg  
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Old 07-18-2010, 11:38 AM   #2
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Come on over, I'll get you straight!
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Old 07-18-2010, 11:48 AM   #3
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This was the first one I built. It's a v1.1 board, but the sequential card mounts to the board the same.


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Old 07-18-2010, 12:01 PM   #4
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Quote:
Come on over, I'll get you straight!
Hey man, I tried to call you earlier but I didn't want to wake you so I didn't ring your phone off the hook.

I'll give you another call in just a few..


Quote:
This was the first one I built. It's a v1.1 board, but the sequential card mounts to the board the same.
Ben - thanks for responding! I understand how it mounts to the board now, but did you look at my attached pic? As you can see, part of the 10pin area is already being used, but since Brain built the board, I'm not sure what he is using that area for, or what I need to do with it?

Do I need to add the header, and resolder on the jumper wires onto the header pins? Do I need to move those jumpers else where?

I'm not understanding what the 12v and SG are being used for currently...

Thanks for any enlightenment
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Old 07-18-2010, 12:05 PM   #5
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Originally Posted by Turbobarber View Post
Do I need to add the header, and resolder on the jumper wires onto the header pins? Do I need to move those jumpers else where?
Either / or


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I'm not understanding what the 12v and SG are being used for currently...
You'll need to ask the person who built your board.
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Old 07-18-2010, 02:27 PM   #6
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That was easy. I'm next.
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Old 07-18-2010, 04:17 PM   #7
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Wish my camera wasn't broken :( I would have some pics, but I'll back track later on and provide some pics of the finished product.

With the help of Turotufas - the product is infact, finished. -- Big thanks for all of your soldering assistance!

Started the car on my original tune - OMFG. Cloud of smoke bigger than the car.... I was under the impression it wouldn't have much effect on my current tune, but this information is not correct. It was a massive change.

So - went from an idle AFR of around 13.7-14.3 to 14.8-15.5 and this just hardly stopped it from smoking.

Car runs -very- smooth, and throttle response is very crisp and acceleration is very good.

Aside from the smoking - I would say it's running very well.

Any ideas on why I would still be smoking with a smooth idle/driving car and those AFRs?

I used the Seq settings for the 99 car off the DIYAutotune site.

Any possibility they need to be slightly different for my 97?

Either way, thanks for the help!! I'll continue to tune the car later today and this week coming, and once it's back to where it should be I'll move on to the EBC install...
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Old 07-19-2010, 11:12 AM   #8
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It really shouldn't be smoking if it wasn't before... Any chance you've got an injector shorted open?
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Old 07-19-2010, 03:42 PM   #9
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Didn't smoke before lol - was clearly all fuel. Could have put a hose on my exhaust and pumped it into the gas tank.

Quote:
Any chance you've got an injector shorted open?
No, I don't think so. All I had on hand at the time was a long screw driver but I listened to the injectors... clickity click click click.

The smoking seems to have subsided. A great deal of fuel removal was required to do this, and I still need to completely retune the top of my map.

Before at 5 psi I would be around 13.2-13.5, now once in boost(instantly) 9.9 or 10.1

I plan to mildly street tune to get my afr's back into shape, and then I have no choice but to focus on a list of new parts...

clutch, bypass valve, new intake pipes, tires, brakes, life, so on and so fourth.

The list goes on :/

Last edited by Turbobarber; 07-19-2010 at 04:32 PM. Reason: Ironing out the details.
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Old 07-20-2010, 12:53 AM   #10
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was the sequential mod worth it? I got my car running very smooth without it, I don't know is it's worth it to fix something that isn't broken.
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Old 07-20-2010, 12:21 PM   #11
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was the sequential mod worth it? I got my car running very smooth without it, I don't know is it's worth it to fix something that isn't broken.
Depends on how much spare time you have I guess... The time spent tuning it in is most important I suppose. Besides doing a smooth installation.

I would say so. $38 for the mod itself - really simple job especially if you built your own ECU and you're already very familiar with it. I was not, but after seeing the inside of it and observing Turotufas do the soldering work, I'm more than confident with a good soldering iron I can do the ignition mods myself.

The car is going to take some time to get it back to smooth, but it feels more like it did when it was stock.... smooth quick starting, smooth transition between gears while crusing, smooth power incline. And this is all on my rough tune to get me going over the next few days.

In a few weekends I should have time to smooth my tune out, and I expect far greater improvement at that point. I can't wait to get my VE table back in shape and get my EAE, EGO, and EBC tuned in... Plus I still have a 3" dual exhaust system to put in... I hope that doesn't offset my tune much, but that has to wait until after the paint goes on.. :( Very excited to hear it though!

I would do it again for sure. I think batch fire is a good way to A) Keep the head a tad cooler, B) throw alot of fuel away doing it. I use water injection in place of an intercooler so I really have no need for a cooler head. So far I've been able to hit 14 psi running a tad short on fuel and no detonation(so far).
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Old 07-20-2010, 12:35 PM   #12
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I'd be interested in hearing if you have misfire problems with sequential and 3.0.3u. I was getting misfires at random times under partial throttle and boost on my 97+DIYPNP. They all disappeared when I went to 2.X and pulled off sequential injection.
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Old 07-20-2010, 05:27 PM   #13
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Originally Posted by orion4096 View Post
I'd be interested in hearing if you have misfire problems with sequential and 3.0.3u. I was getting misfires at random times under partial throttle and boost on my 97+DIYPNP. They all disappeared when I went to 2.X and pulled off sequential injection.
How much tuning did you do when going from sequential back to batch? I finished building my DIYPNP until a lot faster than I thought I would so I went ahead and ordered the sequential module yesterday. Right now it's still wired up for batch, but I figured it would be better to start tuning from scratch with the sequential rather than starting with batch and retuning later.

I'm wondering if I'm better off getting it running on batch first, or if I should jump directly to sequential before tuning.
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Old 07-20-2010, 11:01 PM   #14
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my suggestion would be to tune directly for sequential.

I honestly wish I had. Too bad, so sad...

Do it right...
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Old 07-20-2010, 11:30 PM   #15
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Originally Posted by bearda View Post
How much tuning did you do when going from sequential back to batch? I finished building my DIYPNP until a lot faster than I thought I would so I went ahead and ordered the sequential module yesterday. Right now it's still wired up for batch, but I figured it would be better to start tuning from scratch with the sequential rather than starting with batch and retuning later.

I'm wondering if I'm better off getting it running on batch first, or if I should jump directly to sequential before tuning.
I didn't really keep track because I kept messing around with other settings trying to figure out the misfire. I would wait for sequential to tune it if you're going to pay money for a dyno tune. If you're going to tune it yourself on the street then I wouldn't bother waiting. You can always tweak it later with sequential on there.
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