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300zx LS1 conversion


Guest gmprojectz

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Wow its actually hotter there than it is down here. Granted we are getting rained on all weekend.

 

Im starting the removal process. Does anyone have a list of all the crap I have to pull out of the engine bay. I know engine, tran, ecu and wiring harness are a given, but all the pictures I see it looks like everything has been pulled but I wanted to check before I start just pulling stuff out of the engine bay.

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Wow its actually hotter there than it is down here. Granted we are getting rained on all weekend.

 

Im starting the removal process. Does anyone have a list of all the crap I have to pull out of the engine bay. I know engine, tran, ecu and wiring harness are a given, but all the pictures I see it looks like everything has been pulled but I wanted to check before I start just pulling stuff out of the engine bay.

 

 

Great question, I am wondering this as well. Especially when it comes to the vacuum lines that surround the firewall (since it will be cut out)...

 

Does anyone have a STEP BY STEP LS1 prep list???

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No manual for this one guys!

 

If you are referring to my pictures no don't remove the harness unless you want to spend a lot of time building a new one or unless your feeling pretty froggy.

 

I would start by removing the engine, trans and engine harness.

 

Leave the transmission harness in the car as you will need to use part of it. This is the harness that ties into your backup switch (reverse lights), speedo, oil pressure switch, alternator, starter etc...

 

I think they have a engine swap manual with a lot of general swap information that would surely help you guys out. I would also pick up a Nissan 300zx service manual (make sure its a NISSAN FSM not the cheap ones) for tracing all your wiring out.

 

Good luck with the swap guys!

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I just looked at a local guys 300zx with a 383 stroker in it last night he fabbed his own from metal plates and tubing for the left side and used the stock mount for the right....(wouldnt really recommend that) but its a all else fails life or death quick fix.

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also forgot to ask but what about the wiring harness for the rest of the cars parts? I pulled my whole wiring harness and realized nothing else will work... soo am I going to have to rewire to the ls wiring harness? or what I am not sure what to do

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also forgot to ask but what about the wiring harness for the rest of the cars parts? I pulled my whole wiring harness and realized nothing else will work... soo am I going to have to rewire to the ls wiring harness? or what I am not sure what to do

 

I've seen a lot of people on here use the Painless harness, but I'm not sure if everything is compatible. I have only seen one swap (BlackTrax) that has retained the factory gauge cluster...

 

I'd like to know more about this as well... what's the easiest way?? :hs:

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I have retained the factory gauge cluster and all the factory functions minus a/c and power steering. I also built my car with the understanding that it will not be a daily driver.

 

If you read my post above it tells you what harness you need to tie into to get the majority of the gauge's to work. You will need to run a wire in the new engine harness for the temp sensor for the factory gauge and tie into the accessory connector coming off the engine harness (located under the dash).

 

The trim pots can be adjusted to dial in the tach but I would recomend a ERA (Electronic Ratio Adapter) for the speedo. Here is a link for the one I'm using http://www.abbott-tach.com/era.htm . The guy who posted the way he adjusted the trim pots to calibrate the speedo was TwinTurbo in this thread http://forums.hybridz.org/showthread.php?t=110873 . Here is a great place to get all your wiring information on the Z http://www.300zx-twinturbo.com/cgi-bin/manual.cgi . Here is Firion 13's thread that also has alot of good information http://forums.hybridz.org/showthread.php?t=125578 .

 

If you look in my build thread here http://forums.hybridz.org/showthread.php?t=141130 you will see how I constructed my mounts. Also there are lots of other good pictures that will be of great value to you guys in all of the above threads including this one.

 

Hope that helps!

 

Dan

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I have retained the factory gauge cluster and all the factory functions minus a/c and power steering. I also built my car with the understanding that it will not be a daily driver.

 

If you read my post above it tells you what harness you need to tie into to get the majority of the gauge's to work. You will need to run a wire in the new engine harness for the temp sensor for the factory gauge and tie into the accessory connector coming off the engine harness (located under the dash).

 

The trim pots can be adjusted to dial in the tach but I would recomend a ERA (Electronic Ratio Adapter) for the speedo. Here is a link for the one I'm using http://www.abbott-tach.com/era.htm . The guy who posted the way he adjusted the trim pots to calibrate the speedo was TwinTurbo in this thread http://forums.hybridz.org/showthread.php?t=110873 . Here is a great place to get all your wiring information on the Z http://www.300zx-twinturbo.com/cgi-bin/manual.cgi . Here is Firion 13's thread that also has alot of good information http://forums.hybridz.org/showthread.php?t=125578 .

 

If you look in my build thread here http://forums.hybridz.org/showthread.php?t=141130 you will see how I constructed my mounts. Also there are lots of other good pictures that will be of great value to you guys in all of the above threads including this one.

 

Hope that helps!

 

Dan

 

 

Dan,

 

Thanks for all the input! Do you have any regrets going the LT1 route? I'm shopping around for motors now and LT1's are so much cheaper!!!

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Absolutely no regrets! I wouldn't change a thing. The LT1 is a great building block.

 

Do you know what the weight difference is compared to the LS1? I've read that the LT1 is roughly 60 lbs heavier but I'm not sure how accurate that is. Also, were you running stock cam/heads in your dyno vid? Is your turbo manifold custom? The LS1 seems like a great turbo motor!

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60Lbs is just about right. The big difference is the iron block. Also, there's a bit more vacuum sensors and random computer crap on the LT1s. LS1s are a bit more simple. In addition, the stock LS1 intake manifold is quite light (being simple and made out of composite plastics) compared to the LT1s aluminum plenum setup.

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