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ISPKI

280z 302 sbf swap

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Hey guys, been a loooong time since I was last on here. I am getting back into my engine swap project for my 77 280z. I sold the engine out of the z this year and picked up pieces for the swap. I am shooting for the following setup

302 EFI, W/C T5, unsure about rear differential

I have a W/C T5 already but it has no bellhousing, supposedly low miles

I have an 86 mustang GT 302 but I just obtained a free, running and driving 2001 Mercury Mountaineer with a 302 that I am told is the best factory 302 I can get, so I will likely be using that for the donor

I do not have a rear differential for the swap, that seems to be the only other BIG item that I am missing.

I have the solidwork prints from the Laine swap website and will likely be using those to fabricate my mounts.

I will be updating with pictures soon. Is there anything else I will need for the swap that I cannot pull from the Mountaineer? I was hoping I could use it's ECU and electrical system in the Z.

I would like to be producing over 200hp/325ft/lbs at the wheels with this setup. I was told that the cam in a mountaineer 302 is actually a truck cam and I could gain a decent HP boost (at the cost of a little torque) by swapping the cam out of my mustang GT 302. Does anyone have any experience with this?

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8 hours ago, ISPKI said:

Hey guys, been a loooong time since I was last on here. I am getting back into my engine swap project for my 77 280z. I sold the engine out of the z this year and picked up pieces for the swap. I am shooting for the following setup

302 EFI, W/C T5, unsure about rear differential

I have a W/C T5 already but it has no bellhousing, supposedly low miles

I have an 86 mustang GT 302 but I just obtained a free, running and driving 2001 Mercury Mountaineer with a 302 that I am told is the best factory 302 I can get, so I will likely be using that for the donor

I do not have a rear differential for the swap, that seems to be the only other BIG item that I am missing.

I have the solidwork prints from the Laine swap website and will likely be using those to fabricate my mounts.

I will be updating with pictures soon. Is there anything else I will need for the swap that I cannot pull from the Mountaineer? I was hoping I could use it's ECU and electrical system in the Z.

I would like to be producing over 200hp/325ft/lbs at the wheels with this setup. I was told that the cam in a mountaineer 302 is actually a truck cam and I could gain a decent HP boost (at the cost of a little torque) by swapping the cam out of my mustang GT 302. Does anyone have any experience with this?

Welcome Back!  I'm in the process of a similar swap, and was all set on the Mountaineer/Explorer 302, but out of pure circumstance I'm using a carb'd HO out of an 85 mustang...bought the car wrecked, cleaned up the interior, got a free engine and transmission and made 3 grand on the whole thing!   

But yes, to answer your questions....

-I've done a bunch of abuse to a bunch of different T5s in mustangs, and unless you're being actively stupid they're pretty reliable.  And if they do go, parts and upgrades are plentiful.

-I haven't looked at the later EFI pinouts in a long while since I have a carb'd engine, but IIRC it is integrated to the transmission controller and an immobilizer , so there may be some hiccups on those fronts.  Megasquirt makes a fairly drop in stand-alone with lots of available maps if you run into too many issues.

-the later model 302s are the ones to get. Distributorless, decent head and intake design, and strong power numbers that a cam swap will shift things around for a more "sporty" powerband.

 

Good to see more SBF cars on the board!  

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Yes, I have an 86 302 mostly apart with the roller cam. I will have to do some research amongst the foxbody/sbf crowd to figure out how it will effect the mountaineer engine's performance.

 

I was afraid that the engine control computer also interfaced with the transmission, although I have converted some vehicles from AT to ST and found that bypassing the neutral lockout was the only hurdle which consisted of jumping a couple wires in the harness.

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My big "?" that I have not decided on is the rear differential. The car has an R180 in it right now which will not stand up to the 302. I may leave it in and run it briefly after the swap but I will need to replace it with something a little tougher. I know some R200s would work for it, and then there are R230s, but are there any other options beside those? I have read about swapping an 8.8 into it which I have, but, it seemed to be alot more work and money and I would lose my IRS, plus I dont think a 302 really warrants an 8.8 axle.

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An R200 will last you a long time.  Seems that's not the weak link, it's the IRS universal joints (ask me how I know...) and then the outer stub axles can snap, but that takes some sticky tires, and hard launches.  A street driven 302 should be fine with an R200 and CV axles.  

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The easiest, closest thing to a bolt-in, option might be one of these - https://whiteheadperformance.com/performance-parts/datsun-240z-260z-280z-1970-78/240z-280z-diff-differential-axles-lsd/  They are hard to find on the open market, the CL's and eBay's don't have many.

You can also get an open R200 and convert it to LSD with one of these - https://www.whiteheadperformance.com/?s=differential&post_type=product

Neither of these are bolt-in because you'll need a different mustache bar, and modified propeller (aka drive) shaft.

If you try to run all of that torque through an open R180 diff you'll probably just break it right away or it will wear out from spinning one wheel.

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30 minutes ago, NewZed said:

The easiest, closest thing to a bolt-in, option might be one of these - https://whiteheadperformance.com/performance-parts/datsun-240z-260z-280z-1970-78/240z-280z-diff-differential-axles-lsd/  They are hard to find on the open market, the CL's and eBay's don't have many.

You can also get an open R200 and convert it to LSD with one of these - https://www.whiteheadperformance.com/?s=differential&post_type=product

Neither of these are bolt-in because you'll need a different mustache bar, and modified propeller (aka drive) shaft.

If you try to run all of that torque through an open R180 diff you'll probably just break it right away or it will wear out from spinning one wheel.

Thanks for the links there bud, bookmarked both of them. I was already assuming that I would need to have a driveshaft made. The mustache bar wont be an issue as I have all the tools needed to fabricate them. I have the prints from the Laine web page on my computer.

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