C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

LT5 vs LT1

 
Old 08-01-2017, 11:26 AM
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amr na
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Default LT5 vs LT1

hi guys

i have 1990 c4 its originally zr1 but when i bout her it has LT1 engine with auto transmission .

now i want to reinstall the LT5 my question is do i need to change the wiring ?

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Old 08-01-2017, 11:40 AM
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Kevova
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When someone installed the LT1 the had to transfer at least the LT1 harness with it. So you will need the ZR1 engine and transmission with the harness. It possible you will need passenger compartment harnesses. If car was a stripped or partially stripped shell and persons used a LT1 car as a donor for everything missing. It's not going to be an easy project unless you happen has a wrecked car to transfer parts from.
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Old 08-01-2017, 11:57 AM
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Originally Posted by amr na View Post
hi guys

i have 1990 c4 its originally zr1 but when i bout her it has LT1 engine with auto transmission .

now i want to reinstall the LT5 my question is do i need to change the wiring ?

Are you sure? That might take a bit of work to convert it, I would think. ECM and harness at least? Did you check it by the VIN to be sure before you go that route?
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Old 08-01-2017, 12:01 PM
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Somebody did what to a ZR1?

Pull the RPO codes and the VIN and post them here.
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Old 08-01-2017, 12:16 PM
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Originally Posted by vader86 View Post


Somebody did what to a ZR1?

Pull the RPO codes and the VIN and post them here.


Or post a few pictures..... a used LT5 and ZF6 alone would cost around $12-$15k...Sell it and get the real thing would be cheaper.

Last edited by FASTAZU; 08-01-2017 at 12:20 PM.
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Old 08-01-2017, 12:35 PM
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I'd like to know were you're planning on get an LT5 engine...they are not common and are not easy to get a hold of.

Besides I'm not sure I'm buying this post, not that the LT1 isn't a nice engine, but one would have to be a complete moron to swap out LT5 in a ZR1 for an LT1!

Last edited by bac22; 08-01-2017 at 12:57 PM.
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Old 08-01-2017, 12:59 PM
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Wrong engines end up in cool cars all the time. I doubt it was because owner wanted LT1. Broken LT5 then parked for a while.... Not entirely related uncle had a 69 rs z28 new. Grandfather ended up with the car when the uncle couldn't keep up with the payments. My grandfather died in 70 before he could have the engine and transmission changed out for a regular v8 and automatic transmission. So you never know. btw car was sold unaltered in 71. To some people it's just a car.
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Old 08-01-2017, 01:38 PM
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Originally Posted by Kevova View Post
Wrong engines end up in cool cars all the time. I doubt it was because owner wanted LT1. Broken LT5 then parked for a while.... Not entirely related uncle had a 69 rs z28 new. Grandfather ended up with the car when the uncle couldn't keep up with the payments. My grandfather died in 70 before he could have the engine and transmission changed out for a regular v8 and automatic transmission. So you never know. btw car was sold unaltered in 71. To some people it's just a car.
An LT1 auto swapped into an LT5 ZF6 ZR-1 is not a simple swap.

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Old 08-01-2017, 02:27 PM
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Any body here paid attention lately to the number of first time posters who ask obscure questions and never ever make it to post #2 ???
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Old 08-01-2017, 02:41 PM
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So you bought it with an LT1 auto in it and the seller told you it was really a Z?

Then you say you want to re install your LT5?

Can you clarify this?
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Old 08-01-2017, 03:52 PM
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Is there any possibility that the PO might have put a ZR-1 sticker on the bumper?

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Old 08-01-2017, 04:06 PM
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Originally Posted by vader86 View Post


Pull the RPO codes and the VIN and post them here.
Originally Posted by cuisinartvette View Post
So you bought it with an LT1 auto in it and the seller told you it was really a Z?

Then you say you want to re install your LT5?

Can you clarify this?
Originally Posted by Hot Rod Roy View Post
Is there any possibility that the PO might have put a ZR-1 sticker on the bumper?

All of the above.

I am not buying the OP story at all.
Someone told him it was a ZR-1 and he probably believed them.

Without the RPO codes or pictures, nobody here will be convinced.

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Old 08-01-2017, 04:41 PM
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Originally Posted by Hot Rod Roy View Post
Is there any possibility that the PO might have put a ZR-1 sticker on the bumper?

That would be my second guess. First guess is the PO informed the OP ORALLY. That way, there is nothing in writing.
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Old 08-01-2017, 07:37 PM
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Originally Posted by arbee View Post
Any body here paid attention lately to the number of first time posters who ask obscure questions and never ever make it to post #2 ???
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Old 08-01-2017, 11:17 PM
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Originally Posted by vader86 View Post


Somebody did what to a ZR1?

Pull the RPO codes and the VIN and post them here.

im 100% sure
1: i bout the car with two engines Lt1 installed LT5 extra
2: i checked VIN and its zr1 matching numbers with the engine i have
3 the previous owner changed the engine in 2001 because of wiring problems with lt5
4: my car is one of only two zr1 in my country, that's why he did the swap cuz no parts available

Last edited by amr na; 08-01-2017 at 11:32 PM.
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Old 08-01-2017, 11:29 PM
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Old 08-02-2017, 10:44 AM
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Wow you should have posted that at first... Looks like you have most if not all the parts to put it back. My be a long road but well worth it.

Check out this site for parts,
http://www.jerrysgaskets.com/

Here for lots of help and another great forum
http://www.zr1netregistry.com/Home.aspx
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Old 08-02-2017, 11:34 AM
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Damn....that looks like a pretty major undertaking....but I wish you the best; putting that car "back" is the right thing to do.
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Old 08-02-2017, 02:03 PM
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Originally Posted by amr na View Post
i want to reinstall the LT5 my question is do i need to change the wiring ?
If that's your only question, you have a very serious problem!

Why did the previous owner swap out the LT5 for the LT1? Before you spend a lot of time on this project, you need to find out why!! I'll bet it was for more than an electrical part he couldn't find. Is that engine healthy? I'd suspect you'll find some very serious problems! Somebody spent a ton of money to make that conversion, and I'm betting that you'll need several tons of money to put it back together!

That pile of parts has obviously been seriously abused since they came out of the car 16 years ago! The engine wasn't even sealed??!! Even IF that engine was good when it was removed from the car, it will need a complete tear-down and rebuild after being stored in a filthy environment! Are you an excellent mechanic and an electrical wizard? Do you know excellent mechanics and electrical wizards?

Where are you located?

Good luck!!


Last edited by Hot Rod Roy; 08-02-2017 at 05:42 PM.
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Old 08-02-2017, 02:25 PM
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This is either the best troll job ever posted, or the person that did this needs an IQ test to prove functionality.

I'll believe it 100% when the photos of the paperwork and car are shown as a match.

If it is real, the car and parts are certainly not worth what it will cost to do the job right.

My advice is to part it out on ebay. UNLESS you have a nice shop, money and skills.
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