Sequential Ignition question on an "MSPNP1.5" - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 10-08-2012, 06:05 PM   #1
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Nov 2011
Location: Ft Lauderdale, FL
Posts: 76
Total Cats: 0
Default Sequential Ignition question on an "MSPNP1.5"

Hey guys,

I'm installing an MS2 daughterboard on an MSPNP1 to make an "MSPNP1.5". I'm going to mod the MS2 DB so that I can bring PT6 and PT7 directly to JP2.38 and 36 (JS0 and JS2 on the v3.57 board). Then I'm going to wire the signals to a DIYPNP sequential ignition module and bring out INJ-3 and INJ-4 out to the MSPNP daughterboard.

The question I have is about the wiring. I plan on wiring it up as follows:
INJ-1 -> 2U -> Fuel Injector #1
INJ-2 -> 2V -> Fuel Injector #3
INJ-3 -> 2Y -> Fuel Injector #4
INJ-4 -> 2Z -> Fuel Injector #2

Is this correct?
gtlee77 is offline   Reply With Quote
Old 10-08-2012, 06:07 PM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

you know you have to add extra fuel drivers right?
Braineack is offline   Reply With Quote
Old 10-08-2012, 06:12 PM   #3
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Nov 2011
Location: Ft Lauderdale, FL
Posts: 76
Total Cats: 0
Default

Quote:
Originally Posted by Braineack View Post
you know you have to add extra fuel drivers right?
Aren't those part of the DIYPNP Sequential Ignition kit? (DP_SEQMOD-K)
gtlee77 is offline   Reply With Quote
Old 10-08-2012, 06:17 PM   #4
Supporting Vendor
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,441
Total Cats: 198
Default

You will have to buy two of these kits. You can't mix and match different drivers.
Reverant is online now   Reply With Quote
Old 10-08-2012, 06:24 PM   #5
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Nov 2011
Location: Ft Lauderdale, FL
Posts: 76
Total Cats: 0
Default

Quote:
Originally Posted by Reverant View Post
You will have to buy two of these kits. You can't mix and match different drivers.
Did not know that. Thanks for the info.

What about the wiring table above? Assuming I get two driver kits, is the wiring correct?
gtlee77 is offline   Reply With Quote
Old 10-08-2012, 06:26 PM   #6
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

the parts you need to do seq. injection costs about $2 for all four, fwiw. i wouldn't buy the diypnp module for a v3.57 board install.

you need (4) vnd5n07 drivers, (4) 1K resistors, and (4) 100K resistors. that's it.


you dont have any wires on 2y and 2z, so that idea is void. you'll have to run the two extra wires out to the engine bay, and rewire the harness so that you wire the outputs correctly to each cylinder.
Braineack is offline   Reply With Quote
Old 10-08-2012, 06:27 PM   #7
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Nov 2011
Location: Ft Lauderdale, FL
Posts: 76
Total Cats: 0
Default

Quote:
Originally Posted by Reverant View Post
You will have to buy two of these kits. You can't mix and match different drivers.
Also, care to enlighten me why? Aren't the drivers just sinking current? Do different drivers affect the timing of the PWM signal or something?
gtlee77 is offline   Reply With Quote
Old 10-08-2012, 06:33 PM   #8
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Nov 2011
Location: Ft Lauderdale, FL
Posts: 76
Total Cats: 0
Default

Quote:
Originally Posted by Braineack View Post
the parts you need to do seq. injection costs about $2 for all four, fwiw. i wouldn't buy the diypnp module for a v3.57 board install.

you need (4) vnd5n07 drivers, (4) 1K resistors, and (4) 100K resistors. that's it.
Yeah the circuit looks pretty basic. I'll see if I can get some free samples from some of my distributor contacts. Worst case, I'll give Digikey a ring. Do you know if Radio Shack has the vnd5n07s?
gtlee77 is offline   Reply With Quote
Old 10-08-2012, 06:36 PM   #9
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Nov 2011
Location: Ft Lauderdale, FL
Posts: 76
Total Cats: 0
Default

Quote:
Originally Posted by Braineack View Post
you dont have any wires on 2y and 2z, so that idea is void. you'll have to run the two extra wires out to the engine bay, and rewire the harness so that you wire the outputs correctly to each cylinder.
Yeah, the assumption is that I'll run extra wires from the harness to the injectors. But is the table correct if I wire it all up that way?
gtlee77 is offline   Reply With Quote
Old 10-08-2012, 08:31 PM   #10
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

Yes 1342.
Braineack is offline   Reply With Quote
Old 10-09-2012, 02:56 AM   #11
Supporting Vendor
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,441
Total Cats: 198
Default

Quote:
Originally Posted by gtlee77 View Post
Also, care to enlighten me why? Aren't the drivers just sinking current? Do different drivers affect the timing of the PWM signal or something?
Yes, but different drivers have different on-state resistance for example. So one driver could actually flow less current than another driver, or take more/less time to open/close the injector.
Reverant is online now   Reply With Quote
Old 10-09-2012, 09:11 AM   #12
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Nov 2011
Location: Ft Lauderdale, FL
Posts: 76
Total Cats: 0
Default

Quote:
Originally Posted by Reverant View Post
Yes, but different drivers have different on-state resistance for example. So one driver could actually flow less current than another driver, or take more/less time to open/close the injector.
Oh ok. That makes sense. Thanks.
gtlee77 is offline   Reply With Quote
Old 10-09-2012, 09:11 AM   #13
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Nov 2011
Location: Ft Lauderdale, FL
Posts: 76
Total Cats: 0
Default

Quote:
Originally Posted by Braineack View Post
Yes 1342.
Thanks Brain.
gtlee77 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Raleigh: Fiberglass headlight scope, 1.6L ECU, AFM, Hardtop latches, more bigmackloud Miata parts for sale/trade 13 09-22-2017 01:34 PM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM
01-05 Fab9 PNP COPs (used) FrankB Miata parts for sale/trade 6 09-30-2015 12:48 PM
NA Seat Sliders and Seat Belt Receivers skipstr Miata parts for sale/trade 2 09-28-2015 11:53 PM


Tags
mspnp1.5, sequential injection

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:25 AM.