Author Topic: LZ9 engine swap help  (Read 1203 times)

β˜… Murcie-Me β˜…

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Re: LZ9 engine swap help
« Reply #15 on: February 27, 2025, 11:49:00 PM »
My good friend Rico brought his car over yesterday for me to swap out his front bumper for my 670SV style bumper. This is the same bumper that Bill (Simple Man) has on his build.
I thought it was going to be a simple changeover, basically cut the Murcielago bumper off (original G28 body), add flanges to the fenders and then bolt my bumper on.
His hood was actually a different curvature than the top edge of my bumper, so instead of reshaping his whole hood i cut away his bumper leaving the top 2 inches and then glassed my bumper onto that edge.
Tomorrow I will start filling and sanding and hopefully get a coat of PCL on it in the afternoon.

VF1Skullangel

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Re: LZ9 engine swap help
« Reply #14 on: February 24, 2025, 10:21:39 PM »
engine is all torn down for inspection and everything looks in excellent shape. I took the heads off after these pictures were taken to inspect the cylinder walls and valves. Now to clean everything and start reassembly!

This is going to be great. I know of a guy who did this swap on his Fiero and he's by far the fastest out there as far as Fiero's go. He put a Turbo on it and he's making great power. Now with yours I'm sure just having the exhaust sound better than the stock 2.8 would be more than enough for most people.

VF1Skullangel

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Re: LZ9 engine swap help
« Reply #13 on: February 24, 2025, 10:20:01 PM »
This is awesome! ::headbang

Glad to see you're still at it. The 3900 is a great engine! Probably the best modern swap out there for anything Fiero

Thanks buddy! I'm glad to see you're still around here!
I've been doing a lot of researching, studying, and even taking some online classes about sound dynamics. For many many years people have been trying to get their builds to sound like a Lamborghini, even with engine swaps, 180 degree headers and so on. I have heard many people on these forums say its impossible because of "dual plane VS. flat plane" engines, lower reciprocating mass, shorter stroke, valve size and so on.
I have said all along it has very little to do with the engine, and everything to do with manipulating and multiplying the sound pulses, eliminating some and amplifying others.
I have chose this engine because I believe it will be the easiest to accomplish a high "F1" exhaust note from. Although the sound can be replicated by any engine (4 cylinder minimum), this engine will do it easily/cheaply and also yield more H.P. than most other 6 cylinder swap options.
You're gonna have to come out and do another video when its done lol!

I know if there's anyone who can accomplish that F1 sound out of a V6 it will be you. I have been planning a Trip back to cali, Right now I'm basically disabled from Cancer but it's only a bump in the road.  ::rocker

That car has come such a long way since the last time I saw it in person. It reminds me of my buddies Murcielago SV he sold a few years ago. Artvandelay is his name on IG but he had a purple SV like yours but his was a manual. Crazy car but same color wrap and all. Ill have to try and dig out some pics and post em.

Unless you're on IG?

OMG i'm sorry to hear that but yes, it is just a bump in the road. I know 3 other people going through the same thing right now, all with excellent results so far so hang in there and NEVER stop fighting, you will win.
Yes my IG is 1mikechase.


Ill Try to feature you on an IG post. Many people for years have been asking about your car and I have even had a couple of people ask me to put me in touch with you so they can buy your car.

I still have your number ill have to shoot ya a text sometime.

β˜… Murcie-Me β˜…

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Re: LZ9 engine swap help
« Reply #12 on: February 20, 2025, 08:56:39 PM »
engine is all torn down for inspection and everything looks in excellent shape. I took the heads off after these pictures were taken to inspect the cylinder walls and valves. Now to clean everything and start reassembly!

β˜… Murcie-Me β˜…

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Re: LZ9 engine swap help
« Reply #11 on: February 18, 2025, 11:02:07 PM »
I also started milling the adapter plate for the LZ4 intake to accept the LS throttle body. I don't like the adapter plates that are available, they do not line up correctly and are ported to allow function of the LS IAC valve, which is not compatible with the Megasquirt ECU. Since I am using a different IAC valve that is compatible, I need an adapter that doesn't have that port.

β˜… Murcie-Me β˜…

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Re: LZ9 engine swap help
« Reply #10 on: February 18, 2025, 10:56:35 PM »
So look what arrived today!!!! Now to strip the whole thing down for cleaning, new cam and head gaskets, injector's and so on!

β˜… Murcie-Me β˜…

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Re: LZ9 engine swap help
« Reply #9 on: February 13, 2025, 11:49:08 PM »
This is awesome! ::headbang

Glad to see you're still at it. The 3900 is a great engine! Probably the best modern swap out there for anything Fiero

Thanks buddy! I'm glad to see you're still around here!
I've been doing a lot of researching, studying, and even taking some online classes about sound dynamics. For many many years people have been trying to get their builds to sound like a Lamborghini, even with engine swaps, 180 degree headers and so on. I have heard many people on these forums say its impossible because of "dual plane VS. flat plane" engines, lower reciprocating mass, shorter stroke, valve size and so on.
I have said all along it has very little to do with the engine, and everything to do with manipulating and multiplying the sound pulses, eliminating some and amplifying others.
I have chose this engine because I believe it will be the easiest to accomplish a high "F1" exhaust note from. Although the sound can be replicated by any engine (4 cylinder minimum), this engine will do it easily/cheaply and also yield more H.P. than most other 6 cylinder swap options.
You're gonna have to come out and do another video when its done lol!

I know if there's anyone who can accomplish that F1 sound out of a V6 it will be you. I have been planning a Trip back to cali, Right now I'm basically disabled from Cancer but it's only a bump in the road.  ::rocker

That car has come such a long way since the last time I saw it in person. It reminds me of my buddies Murcielago SV he sold a few years ago. Artvandelay is his name on IG but he had a purple SV like yours but his was a manual. Crazy car but same color wrap and all. Ill have to try and dig out some pics and post em.

Unless you're on IG?

OMG i'm sorry to hear that but yes, it is just a bump in the road. I know 3 other people going through the same thing right now, all with excellent results so far so hang in there and NEVER stop fighting, you will win.
Yes my IG is 1mikechase.

VF1Skullangel

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Re: LZ9 engine swap help
« Reply #8 on: February 13, 2025, 10:32:44 PM »
This is awesome! ::headbang

Glad to see you're still at it. The 3900 is a great engine! Probably the best modern swap out there for anything Fiero

Thanks buddy! I'm glad to see you're still around here!
I've been doing a lot of researching, studying, and even taking some online classes about sound dynamics. For many many years people have been trying to get their builds to sound like a Lamborghini, even with engine swaps, 180 degree headers and so on. I have heard many people on these forums say its impossible because of "dual plane VS. flat plane" engines, lower reciprocating mass, shorter stroke, valve size and so on.
I have said all along it has very little to do with the engine, and everything to do with manipulating and multiplying the sound pulses, eliminating some and amplifying others.
I have chose this engine because I believe it will be the easiest to accomplish a high "F1" exhaust note from. Although the sound can be replicated by any engine (4 cylinder minimum), this engine will do it easily/cheaply and also yield more H.P. than most other 6 cylinder swap options.
You're gonna have to come out and do another video when its done lol!

I know if there's anyone who can accomplish that F1 sound out of a V6 it will be you. I have been planning a Trip back to cali, Right now I'm basically disabled from Cancer but it's only a bump in the road.  ::rocker

That car has come such a long way since the last time I saw it in person. It reminds me of my buddies Murcielago SV he sold a few years ago. Artvandelay is his name on IG but he had a purple SV like yours but his was a manual. Crazy car but same color wrap and all. Ill have to try and dig out some pics and post em.

Unless you're on IG?

β˜… Murcie-Me β˜…

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Re: LZ9 engine swap help
« Reply #7 on: February 12, 2025, 03:41:56 PM »
My new (used) 4T60 transmission arrived today! I've never seen one in person out of a car, I'm surprised how small (but heavy) they are! I gave it a quick cleaning with my pressure washer, I'll have to get some good degreaser and aluminum brightener to get it sparkling though.
I didn't realize that the trans takes two different types of tripots, a male ended one that inserts on the passenger side of the trans, and a female ended one that fits in the driver's side. I still need to take a few measurements of the TH125 that's in my car now and compare it to the 4T60 to see if I can use my same axles.
My engine is scheduled to arrive some time Monday the 17th, and my new camshaft and timing set should arrive a few days later.
« Last Edit: February 12, 2025, 03:54:42 PM by β˜…Murcie-Meβ˜… »

Jets303

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Re: LZ9 engine swap help
« Reply #6 on: February 10, 2025, 08:56:04 PM »
Good to see you working on that beauty still Mike! Following along with your motor swap!

β˜… Murcie-Me β˜…

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Re: LZ9 engine swap help
« Reply #5 on: February 10, 2025, 03:12:30 PM »
This is awesome! ::headbang

Glad to see you're still at it. The 3900 is a great engine! Probably the best modern swap out there for anything Fiero

Thanks buddy! I'm glad to see you're still around here!
I've been doing a lot of researching, studying, and even taking some online classes about sound dynamics. For many many years people have been trying to get their builds to sound like a Lamborghini, even with engine swaps, 180 degree headers and so on. I have heard many people on these forums say its impossible because of "dual plane VS. flat plane" engines, lower reciprocating mass, shorter stroke, valve size and so on.
I have said all along it has very little to do with the engine, and everything to do with manipulating and multiplying the sound pulses, eliminating some and amplifying others.
I have chose this engine because I believe it will be the easiest to accomplish a high "F1" exhaust note from. Although the sound can be replicated by any engine (4 cylinder minimum), this engine will do it easily/cheaply and also yield more H.P. than most other 6 cylinder swap options.
You're gonna have to come out and do another video when its done lol!

VF1Skullangel

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Re: LZ9 engine swap help
« Reply #4 on: February 10, 2025, 12:48:44 AM »
This is awesome! ::headbang

Glad to see you're still at it. The 3900 is a great engine! Probably the best modern swap out there for anything Fiero

β˜… Murcie-Me β˜…

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Re: LZ9 engine swap help
« Reply #3 on: February 05, 2025, 04:16:46 PM »
The Megasquirt ECU I am using will not control a 4 wire IAC that is in the LS throttle body. Since a 2 wire IAC is not made that will fit the throttle body, I will close off that port and use an inline Porsche IAC that is 2 wire. There is an additional vacuum port on the LZ4 manifold that I will use as an attachment point to hook the Porsche IAC into.
« Last Edit: February 05, 2025, 04:32:30 PM by β˜…Murcie-Meβ˜… »

β˜… Murcie-Me β˜…

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Re: LZ9 engine swap help
« Reply #2 on: February 05, 2025, 04:06:14 PM »
I ordered my 4T60 (440-T4) today, I'm happy I was able to find one. I wanted the 4T60 because it is not electronically controlled and has a TV cable that will attach to the LZ9 engine the same way the TH125C attaches to the stock 2.8L engine and controls the shift points manually.
I went to the junkyard and got an LS 75mm throttle body I will be using, its non electronic as well and will hook-up to the Fiero throttle cable. I also picked up an upper intake manifold from an LZ4 (3500) engine, it has much better flow than the stock LZ9 intake and doesn't have the variable flow louvers inside which I think is unnecessary.

β˜… Murcie-Me β˜…

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LZ9 engine swap help
« Reply #1 on: February 02, 2025, 06:22:43 PM »
So it's time for an engine swap with my build as well, so I've decided to go with the LZ9 3900 engine with a 4T60 (non "E") transmission.  I've been posting over on the Fiero forum and have been told to use the Megasquirt mini pro 3 ECU to control the engine, but thought I would ask here if any of you guys have experience with this ECU and can offer any guidance on how I should go about this. Thank you all in advance!!