I have too many browser tabs already open...HELP.
I have so many browser tabs open and I've read so much in the past few weeks it makes my head hurt. Looking for some input from the gurus; If this needs to be moved to ECU go ahead, I was torn on which section to put this in. Some of the questions are ECU related, but they're in boosted applications.
My car is a '92 Miata. Has the 1.6 in it with a Greddy kit, fmic setup, vortech fmu, the basic setup. No standalone of any kind. I pulled the whole kit out and was planning on refreshing the 1.6 and upgrading my dp and keeping the greddy setup...however: I found a deal on a built 1.8 from a '96, so i scooped it up. Specs: Manley Forged Rods Supertech Forged Pistons ACL Bearings ARP head studs Cometic head gasket Port n polish headwork Bell Engineering turbo manifold Manifold studs Turbo studs S14 t28 bb with gt2560r chra - .60ar comp, .64 turbine Hallman MBC Bell Engineering 2.5" separated gases downpipe Tial blow off DSM Blue tops 2.5" charge piping Fmic Megasquirt PNP version 1 Speed density I plan on relocating the Tial to the cold side piping, it's hot side right now. It came with a Megasquirt PNP MM 9697 v1 included. From my research, the pnp for the 96-97's is basically useless to me if I put this motor into my '92 that obviously has a 1.6 harness. It *may* work but I'd lose control over several key items and its just a bigger headache than it's worth. Question #1: I'd be better off selling the PNP mm9697 and just getting a PNP for a 90-93 correct? If so, am i better served spending the extra and getting a pnp v2? Question #2: Say i go with a pnp v2 for the 90-93. This 1.8 motor obviously has the vtps on it and I'm going to want to take advantage of that. If I'm using the 90-93 pnp and harness, I'm guessing I will have to modify the pigtail from the 1.6 tps to work with the 1.8 vtps correct? Then just select the vtps from the megasquirt options because it's designed to accept a vtps signal? I've seen a few how-to's on this but none of them very clear. Can someone point me to making the 1.6 harness work with a 1.8 vtps? Question #3: Companies like Flyin Miata have instructions for this swap, but almost all of it is based around NOT having a standalone. So you need to run an adapter plate for the 1.8 throttle body. With a standalone, things like using the adapter plate to be able to use the 1.8 throttle body isn't needed correct? So if you have a 90-93 chassis, using a 90-93 megasquirt PNP, what are the key items you will undoubtedly have to address that the megasquirt can't account for or deal with? 1. Extending CAS wiring 2. Using 1.6 Coil Pack Necessary? 3. Thermostat sensor location? 4. Feel free to correct or modify my thinking here.... I'm here to continue to learn, I appreciate the guidance ahead of time! And a bonus random thought: According to Garrett they suggest rotating the chra on oil/water cooled turbos 20 degrees off horizontal to aid with thermal siphoning during cool down. Most things you see/read, people stress having your gravity oil drain perfectly pointed downwards. This obviously causes conflict. Looking at the setup on this motor, it follows the school of thought of having drain pointed straight down which in turn causes the water inlet/outlet to be straight across. So what do you guys with oil/water cooled turbos consider the proper train of thought in this matter? |
Too many questions. I'll answer some random ones.
Sell the 96-97pnp. If you have to ask then you don't want to try and adapt it. Your 92 is already wired for TPS. Just hook the 1.8 TPS up correctly. Water cooling really doesn't matter that much. Don't boost into your garage and you will be fine. Hook it up if you want but plenty of turbos are oil cooled only. The fm adapter plate is to run a 1.6 TB on a 1.8. You don't need to do that. |
Originally Posted by aidandj
(Post 1293667)
Too many questions. I'll answer some random ones.
Sell the 96-97pnp. If you have to ask then you don't want to try and adapt it. Your 92 is already wired for TPS. Just hook the 1.8 TPS up correctly. Water cooling really doesn't matter that much. Don't boost into your garage and you will be fine. Hook it up if you want but plenty of turbos are oil cooled only. The fm adapter plate is to run a 1.6 TB on a 1.8. You don't need to do that. |
Any variable tps that goes on the shaft wired to that plug will work.
Its up to you to decide which one to use and how. Dann |
Originally Posted by nitrodann
(Post 1293671)
Any variable tps that goes on the shaft wired to that plug will work.
Its up to you to decide which one to use and how. Dann Of course using PNP after the fact. |
Originally Posted by OGWar
(Post 1293674)
So if I just wanted to use the 1.8 tb and vtps that's already on this motor, what's the process for making the tps plug that's already on the 1.6 harness work with it? Pretty sure they're different plugs.
Of course using PNP after the fact. You just need to get the TPS power, signal, and ground. |
Buy the right plug.
Wire it to the TPS port on the megasquirt using the ECU harness wires already there. How depends on what megasquirt you use. |
Originally Posted by acedeuce802
(Post 1293678)
Repin the 1.6 harness for a 1.8 connector? Cut a pigtail off a 1.8 harness and use crimp butt connectors and heat shrink?
You just need to get the TPS power, signal, and ground. |
Originally Posted by deezums
(Post 1293679)
Buy the right plug.
Wire it to the TPS port on the megasquirt using the ECU harness wires already there. How depends on what megasquirt you use. I see in the response above I can just steal the pigtail from a 1.8 harness and solder/heat shrink it to the wiring that fed the 1.6 tps plug. Didn't realize it was that straightforward. |
Well, that's half of it at least.
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Originally Posted by deezums
(Post 1293682)
Well, that's half of it at least.
I'm assuming the part I'm not thinking of is on the megasquirt side? If it's a PNP setup and I'm just plugging the harness plugs directly into the side of the PNP box, what is it that I'd be modifying on that end? |
Originally Posted by OGWar
(Post 1293670)
. So would the easiest route be to find a 1.6 automatic throttle body (vtps) and use the fm adapter plate?
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1.6 doesn't have vtps, so mspnp will ignore all 3 wires in stock form.
I don't know what to tell you from here, the link to the guide for adding vtps is dead. Edit: nevermind, just took more than 30 seconds of googling http://www.megasquirtpnp.com/docs/mspnp_g2_mm9093.php |
Originally Posted by aidandj
(Post 1293667)
Water cooling really doesn't matter that much. Don't boost into your garage and you will be fine. Hook it up if you want but plenty of turbos are oil cooled only.
While the oil drain needs to be a constant downward slope, it can easily be 20 degrees off vertical and still work properly, so you're not trading off convection cooling for proper oil drain. That said, I don't get the impression the tilted convection cooling setup is all that critical -- it basically just stops water from boiling in the turbo when you shut the motor off. My 2560 boiled water after shutoff from day one, and the bearing was just fine until it ate a throttle body screw, 60K miles later. --Ian |
Very interesting thread as I am doing a 2003 complete swap into a 91. At this point I am also leaning towards a 91 mspnp and wiring up everything into it instead of switching the whole harness.
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Originally Posted by OGWar
(Post 1293659)
It came with a Megasquirt PNP MM 9697 v1 included. From my research, the pnp for the 96-97's is basically useless to me if I put this motor into my '92 that obviously has a 1.6 harness. It *may* work but I'd lose control over several key items and its just a bigger headache than it's worth. Question #1: I'd be better off selling the PNP mm9697 and just getting a PNP for a 90-93 correct? If so, am i better served spending the extra and getting a pnp v2? Question #2: Say i go with a pnp v2 for the 90-93. This 1.8 motor obviously has the vtps on it and I'm going to want to take advantage of that. If I'm using the 90-93 pnp and harness, I'm guessing I will have to modify the pigtail from the 1.6 tps to work with the 1.8 vtps correct? Then just select the vtps from the megasquirt options because it's designed to accept a vtps signal? I've seen a few how-to's on this but none of them very clear. Can someone point me to making the 1.6 harness work with a 1.8 vtps? Question #3: Companies like Flyin Miata have instructions for this swap, but almost all of it is based around NOT having a standalone. So you need to run an adapter plate for the 1.8 throttle body. With a standalone, things like using the adapter plate to be able to use the 1.8 throttle body isn't needed correct? So if you have a 90-93 chassis, using a 90-93 megasquirt PNP, what are the key items you will undoubtedly have to address that the megasquirt can't account for or deal with? 1. Extending CAS wiring 2. Using 1.6 Coil Pack Necessary? 3. Thermostat sensor location? 4. Feel free to correct or modify my thinking here.... 2. unless you wire something else in. 3. wtf is a thermostat sensor? You mean teh thermoswitch on the front of 1.6L motors? And a bonus random thought: According to Garrett they suggest rotating the chra on oil/water cooled turbos 20 degrees off horizontal to aid with thermal siphoning during cool down. Most things you see/read, people stress having your gravity oil drain perfectly pointed downwards. This obviously causes conflict. Looking at the setup on this motor, it follows the school of thought of having drain pointed straight down which in turn causes the water inlet/outlet to be straight across. So what do you guys with oil/water cooled turbos consider the proper train of thought in this matter? |
Thanks for the reply Braineack. I may contact you for a diypnp built for using the 1.8tb, icv, and coil pack instead of going the pnp route.
If I use the 1.6 coil pack on a 1.8 motor, I just verify that the orientation of coil->cylinder # is the same as it was when it was on the 1.6 motor correct, since the 1.8 is arranged differently. Yes I meant thermoswitch, sorry I mislabeled that. Here's the link to Garrett's discussion on oil/water cooled turbos I was referring to, I thought it was an interesting read: https://www.turbobygarrett.com/turbo...er_Cooling.pdf |
nothign changes between the 1.6L and 1.8L as far as spark/firing order.
The 1.8L coilpack just happened to be arranged slighty differently. You'd put your spark plug wires exactly as they are right now in the new motor. if you're running MS, the thermoswitch matters not. temp difference of 25°F from vertical. I'd much rather have my turbo be 25°F warmer after shutoff and a oil drain that works well... There's no way youll be able to plumb the turbo "optimally" to even bother. The outlet you'll be using is already lower than the turbo ports. Garrett also used to say never rotate turbo past 15° else it would degrade oiling. |
Originally Posted by Braineack
(Post 1293742)
nothign changes between the 1.6L and 1.8L as far as spark/firing order.
The 1.8L coilpack just happened to be arranged slighty differently. You'd put your spark plug wires exactly as they are right now in the new motor. if you're running MS, the thermoswitch matters not. temp difference of 25°F from vertical. I'd much rather have my turbo be 25°F warmer after shutoff and a oil drain that works well... There's no way youll be able to plumb the turbo "optimally" to even bother. The outlet you'll be using is already lower than the turbo ports. Garrett also used to say never rotate turbo past 15° else it would degrade oiling. Yeah sounds like Garrett has differing opinions. I too would rather avoid oil buildup inside the turbo and all the fun that can lead to. I just had never heard the 20deg principle before, every oil/water cooled setup I've ever seen has always focus on having the drain straight down which left the water setup horizontal. I'll be in touch Braineack to discuss MS options, but I'll save that for PM. Thanks for the replies everyone, I'm learning. |
Looking at it, running a 90-93 COP conversion, like one from Fab9 tuning, eliminates all the coil pack swapping concern and is honestly a better option if I'm planning on north of 15-16 psi. Would you agree? I don't see any notices that people running MS run into issues with the Fab9 setup.
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