L28et swap Question
04-28-2009, 09:07 AM
#1
Registered User
Thread Starter
Join Date: Mar 2009
Posts: 15
L28et swap Question
I have the chance to buy a L28et cheap but it doesn't have the harness or ecu with it. My car in n/a. I haven't been able to find any info in the computer. All I have been able to find is ever one saying just swap the harness and ecu with it. Can I get the N/A harness and ecu to work or should I just try to find a harness and ecu from a turbo car or Z31 turbo.
04-28-2009, 09:35 AM
#2
Unless you love headaches, and want to make the motor VERY limited on power... Get the L28ET efi harness. 
You could get one from a Z31T as well, but you'll probably have a harder time finding that one over an L28ET harness.
You could get one from a Z31T as well, but you'll probably have a harder time finding that one over an L28ET harness.
04-28-2009, 09:37 AM
#3
Registered User
Join Date: Jun 2007
Location: oklahoma city, oklahoma
Posts: 505
NA oil pump shaft, NA distributor, NA AFM. You'll have to adjust the spring in the AFM to dump more fuel at WOT since the NA computer won't compensate for added air due to boost levels.
WARNING!!!!
If you don't get the spring in the AFM adjusted just right, you will dump too much fuel throughout the entire rev range, you'll wash a cylinder and destroy your engine.
understand that the NA computer is in NO WAY set up to maintain a balanced A/F mixture under boost, and adjusting the spring in the AFM is only going to balance that A/F mixture out for a certain area of throttle usage. if you leave it stock, you'll run lean when you generate boost. if you set the spring to even out the a/f misture under boost, you'll run rich the rest of the time. This is where the turbo engine/NA computer combination gets dangerous. It becomes like tuning a carburator. you're only going to get one area where it will run great. the rest of the time you'll either be too lean or too rich. difference is with this set up, if you're out of tune, your performance doesn't just suffer, your engine will grenade.
It may be possible to remedy this issue with the use of a Rising Rate Fuel Pressure Regulator. You'd adjust the AFM spring to maintain propper A/F mixture at 0 boost or NA operating peramaters. Under boost, the RRFPR would increase the fuel pressure, dumping more fuel everytime the injectors open.
My personal advice: go buy a mega-squirt and skip all this jerry-rigging nonsense.
WARNING!!!!
If you don't get the spring in the AFM adjusted just right, you will dump too much fuel throughout the entire rev range, you'll wash a cylinder and destroy your engine.
understand that the NA computer is in NO WAY set up to maintain a balanced A/F mixture under boost, and adjusting the spring in the AFM is only going to balance that A/F mixture out for a certain area of throttle usage. if you leave it stock, you'll run lean when you generate boost. if you set the spring to even out the a/f misture under boost, you'll run rich the rest of the time. This is where the turbo engine/NA computer combination gets dangerous. It becomes like tuning a carburator. you're only going to get one area where it will run great. the rest of the time you'll either be too lean or too rich. difference is with this set up, if you're out of tune, your performance doesn't just suffer, your engine will grenade.
It may be possible to remedy this issue with the use of a Rising Rate Fuel Pressure Regulator. You'd adjust the AFM spring to maintain propper A/F mixture at 0 boost or NA operating peramaters. Under boost, the RRFPR would increase the fuel pressure, dumping more fuel everytime the injectors open.
My personal advice: go buy a mega-squirt and skip all this jerry-rigging nonsense.
04-28-2009, 09:58 AM
#4
The Evil Twin
Join Date: Mar 2001
Location: Seattle, WA
Posts: 9,294
300ZX turbo wiring and ECU is an option.
You may need to extend the wires for a few specific sensors as you go.
If you're unfamiliar with the L28 then hopefully you have someone local that can help identify where sensors from the Z31 harness go on the L28 engine.
You may need to extend the wires for a few specific sensors as you go.
If you're unfamiliar with the L28 then hopefully you have someone local that can help identify where sensors from the Z31 harness go on the L28 engine.
04-28-2009, 10:01 AM
#5
Externally Wastegated
Join Date: Oct 2001
Location: San Diego
Posts: 1,220
If you can, get an FSM for the both your n/a harness and the 300zxt harness if you choose to go that route. A wiring schematic will make life a lot easier, especially if you run into snags (which we all do) when trying to fire up your motor.
05-21-2009, 02:41 PM
#7
Registered User
Join Date: Feb 2006
Posts: 285
Sorry guys dont mean to THREAD JACK. but i was thinking of making a thread with this same title. and also has to do with wiring...
I have my donor zxt three feet away from me and i took offf the tranny , drive shaft. manifolds turbo ETC ETC. its just the bare block laying in the engine bay and i want to take whatever parts of the harness i need OFF..
question is..
What EXACTLY (wiring harness related) do i need to take off ?
do i need to take everything ?
if someone has a diagram i can VISUALLY refferr too that would be great! thanx
this is my first time doing the turbo swap into a 71z and i want to do it myself (so i know it gets done RIGHT)
I have my donor zxt three feet away from me and i took offf the tranny , drive shaft. manifolds turbo ETC ETC. its just the bare block laying in the engine bay and i want to take whatever parts of the harness i need OFF..
question is..
What EXACTLY (wiring harness related) do i need to take off ?
do i need to take everything ?
if someone has a diagram i can VISUALLY refferr too that would be great! thanx
this is my first time doing the turbo swap into a 71z and i want to do it myself (so i know it gets done RIGHT)
05-21-2009, 02:49 PM
#9
Registered User
Join Date: Feb 2006
Posts: 285
do i need any of the relays or whatever that go on the pasenger side of the engine bay ? :/
any visual drawings or diagrams i could go off of. (im kind of the visual learner ) :P
05-21-2009, 02:54 PM
#10
05-21-2009, 06:14 PM
#11
Registered User
Join Date: Feb 2006
Posts: 285
https://www.zdriver.com/forums/showthread.php?t=27449
Clicky (write-up): http://forums.hybridz.org/showthread.php?t=99620
Clicky (write-up): http://www.zcar.com/forums/read/1/55...682#msg-557682
Clicky (write-up): http://forums.hybridz.org/showthread.php?t=99620
Clicky (write-up): http://www.zcar.com/forums/read/1/55...682#msg-557682
if you like you can take a look at the ZCAR link you sent me i posted some pics. of my harnesses. some plugs look different than the ones that the threadmaker posted so i hope i go the right things out.
05-21-2009, 08:17 PM
#13
Registered User
Join Date: Jul 2005
Location: GA
Posts: 196
Wouldn't an after market Fuel management system be an option as well? It will cost more but it is a lot more customizable and since you are going through all of that trouble anyway . . .
I guess it depends on what you want to do with it and how much you wanna spend.
Good luck with the swaps!!
I guess it depends on what you want to do with it and how much you wanna spend.
Good luck with the swaps!!
05-22-2009, 01:01 AM
#14
NisTuner
Join Date: Sep 2005
Location: Cleveland, Ohio
Posts: 2,800
actually as far as I've seen even the 82 and 83 harnesses have differences. I know from the HybridZ link there were wires they were showing to connect that never existed on my harness. Although there is the one diagram that someone made that was posted in the zcar.com writeup by wannabreZ that matched my harness.
05-22-2009, 09:03 AM
#15
Über User
Join Date: Sep 2005
Location: lemont, Illinois
Posts: 9,532
82 and 83 harnesses are different. but only SLIGHTLY. it looks exactly the same but there are some plugs by the ECU plugs (like for the ignition harness and crap) that the wires are in a different order or color even.
05-22-2009, 09:13 AM
#16
NisTuner
Join Date: Sep 2005
Location: Cleveland, Ohio
Posts: 2,800
Yeah I know the differences are slight, but that's one of the things that just makes it slightly harder for the writeups is just that every year turbo car had a different harness whether it be a big or small difference.
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