Hay all

Ive decided im going to be putting a 380 engine into my TH sports manual. Using my gearbox. Ive read some threads about the conversion but theres not alot of information about it. So i thought i would ask a couple of questions.

1) Can i use the 3gen radiator? If not wat do i have to do with the cooling system?

2)Engine is a straight swap there is no modification to engine mounting? Can i use 3 gen engine mounts.?

3)Exhaust system can i use the stock 380 manifold and bolt it up to my 3gen catback? Wat have other people done with there exhaust setups with the conversion?

4)ECU wiring how does that work.? do i hook the 3.5l ecu up and get it retunned? Or do i use a 380 ecu?

5)Does the tacho and speedo hook up no modifications?

6)Any one else with imformation i will need to know on the conversion let me know cause ill be giving my mechanic all this imformation.?

Thankyou Kurt

1) yes
2) yes
3) Magna/6G74 headers required
4) retuned 6G74 ECU
5) yes, same ECU and the gearbox doesn't change
6) you only use the 6G75 long motor - block, internals and heads. Everything else is a carryover from the 6G74

1) yes
2) yes
3) Magna/6G74 headers required
4) retuned 6G74 ECU
5) yes, same ECU and the gearbox doesn't change
6) you only use the 6G75 long motor - block, internals and heads. Everything else is a carryover from the 6G74

Ok thankyou for that imformation. So thats yes to using 3gen engine mounts aswell? Wat exactly needs to be swapped from the 6G74 motor? Retunning the 74 ecu were would i go to do this? Would i need to let the tuner know anything?

I've only ever heard of ECUs being sent to SKR in Adelaide for a baseline flash tune. Yes, engine mounts don't change. Everything needs to be swapped (ignition, fuelling, intake manifold) over.

Give me a call sometime if you want to and I can run through this for you, is much easier than putting in here as too much to type lol OR as I have stated to another member, if you can find and pay for a motor in Melb, send it to me, I can have it all done and ready to put into your car, send it up to you to bolt in

Hey


Is there a mechanic who i can just drop my car to who have done this conversion
Sydney? just thinking my car will be wanting a new engine soon and would rather put the 3.8ltr in her

I'm just going to throw this out there; will the 6G75 bolt to the four speed auto?

Just seems to me the overall gearing of the 4spd would better suited to the 3.8l.

Provided the old 4spd could handle thee extra horses.

Lol 3 extra horses?? Try 50. Yeah it'll bolt in fine... I you are looking for a motor check my FS thread.

Yeah it'll bolt in fine... I you are looking for a motor check my FS thread.

Let me get the brake upgrade first huh... and the 17" rims before that. My Magna has a long shopping list, the 6G75 is on the list but its a fair way down.

Unless of course you accept vital organs as payment? I have two low km's kidneys... one owner, log books, only thrashed on weekends.

Thee = the. Not three. Type-o.

I'm just going to throw this out there; will the 6G75 bolt to the four speed auto?

Just seems to me the overall gearing of the 4spd would better suited to the 3.8l.

Provided the old 4spd could handle thee extra horses.

Nothing to do with horsepower, gearboxes are rated to torque. The 4sp will be fine, its rated with a certain threshold so it should be ok

Give me a call sometime if you want to and I can run through this for you, is much easier than putting in here as too much to type lol OR as I have stated to another member, if you can find and pay for a motor in Melb, send it to me, I can have it all done and ready to put into your car, send it up to you to bolt in

Hey Madmagna,

Do you still do this as a bolt up?

Certainly do, I have a few in stock at the moment and can also do one which is sent to me

Certainly do, I have a few in stock at the moment and can also do one which is sent to me

Hey madmagna

What cost am I looking at to do the conversion all supplied by yourself other than the drop in, to get it running?


Cheers

just wondering why we cant use the 380 inlet manifold with throttle body adapter? seems to be a better design. i am modifying the 380 fuel rail for dual inlet and single return. not sure how that will go yet. has anyone left any of the 380 bolt-on parts attached? im getting ready to fit my 3.8 next week and would like to use the 380 inlet manifold if possible

just wondering why we cant use the 380 inlet manifold with throttle body adapter? seems to be a better design. i am modifying the 380 fual rail for dual inlet and single return. not sure how that will go yet. has anyone left any of the 380 bolt-on parts attached?

My Magna throttle body (with cruise and traction) bolted straight up to the 380 upper manifold, no need for welding of flange holes and re-tapping or adapters.

just curious what 380 engine parts are a good fit to TL/TW model Magna's are the 380 cams worth the effort? what about camshafts and stuff like that any help is greatly appreciated as im doing a budget build :)

Umm Cams are Camshafts, that is about all that is good to fit aside from teh engine itself

Umm Cams are Camshafts, that is about all that is good to fit aside from teh engine itself

Okay sweet cheers Mal

Hey guys, I was going to get mal to do my 380 conversion but a list of events have led to me doing it now! What is needed to bolt to the 380 motor before it can be slid in? Any and all info would be great! I will start a new thread if needed.

Have you searched?

That's how I found this thread, kind of limited as I'm on a fone using a shit house forum app!

ok dave, i have searched and searched.... i have come accross the fact a sump mod may or may not need to be done, i have found out all alt, starter etc needs to be changed over, something about rocker covers needing to be changed over? and the inlet manifold! but still kind of thought someone would of whitten up a little shopping list of parts needed! have they?

Well now to gather my shopping list, there is a member on here that is really really helpful and has given me a huge amount of info and it's looking like a freaky job to do but, anyway my list so far has. Timing belt kit, taper cover gaskets, inlet manifold gasket, sump gasket, I'm sure the list is a hell of alot longer then this? I'm hoping to order all parts needed today so if anyone can chime in with knowledge that'd be awesome.

... anyway my list so far has. Timing belt kit, taper cover gaskets, inlet manifold gasket, sump gasket, I'm sure the list is a hell of alot longer...

It's a TAPPET, not tapper, but I think we all know what you meant.

The sump mod is a closely guarded secret. It's exact specs have been the source of much heated debate and abuse in the past. If it doesn't offend other members/mechanics perhaps some of the new owners of the 6G75-transplants can post some photos and dimensions to assist other DIY'ers on here?

not to be rude or anything but tomato potato, anywayz, ill stop there! and i appreciate the reply towards the sump mod! i searched and searched and found the same thing! nobody wants to give any love on this! but there are a few good people still and they are the only reason my conversion is still going ahead!! not going to name names but you guys know who you are and thank you! and forgive the TAPPERS being mixed with the ROCKERS..

this is what i found when searching. im using ralliart headers on my conversion

if you use ralliart, or hm headers no mod required to use 380 sump - update 5/11/11 i had to use spacers with the ralliart headers as the y pipe was too close to the sump.

if you use factory 3.5 exhaust manifold 10mm spacers required between manifold and y pipe to use 380 sump

if you use pacemaker headers 3.5 sump will need to be modified and fitted. see the following link

admin edit: links to other other forums are not allowed

The big thing is wheather you need to chage the sump or not it's an exhaust/ground clearance issue.

If you need to change to a 3.5 sump as we did for exhaust and ground clearance isssue.

Use the 3.5 sump and oil pick up, you will need to tape down the windage tray bolted to the main cradle, just enough for the pick up to clear it about 5mm.
Also the tray in the bottom of the 3.5 sump needs tapping down on the end of the raised section to clear the windage tray on the main cradle.
The 3.8 block has 2 bolt holes in the wrong spot for the 3.5 sump you can drill and tap these but some times there is not quite enough material to do so. I don't worry about drilling and tapping any more the alloy sump is quite stiff to stay sealed with out them have had no leaks so far.

Hope this helps, thourght I'd done a write up on this before.
Cheers Dave

My Magna throttle body (with cruise and traction) bolted straight up to the 380 upper manifold, no need for welding of flange holes and re-tapping or adapters.

thanks. that was helpful. i fitted my 6g75 with the 380 upper manifold. also had to use the 380 rear rocker cover (small air pipe on the 6g74 rocker cover hits 380 manifold) , block off the erg pipe from exhaust manifold (just cut it off, clamped it shut and welded it) and use a custom accelerator cable as the gen 3 is too short with the 380 manifold. for the extra effort i prob would not bother again unless it does give some performance increase. also have to run a pod filter as the manifold angle is now different

Wonder why I crack it sometimes and then I read a lot of the above comments,

So, how many times have I and others in the know (like DaveTJ) put into various threads the PROPER way to do this??? Shit, I have only done over 20 of these, most of them inspected and registered. But hey, dont listed to me

For those who really want to know the proper way, here it is one last time

Sump, If you want to do a dodgy, by all means drop your exhaust 10mm or use hm or what ever and have them all but rubbing on your sump :nuts: OR do the sump mod

TB will bolt onto the Manifold HOWEVER the line up is average to say the least. With the ones I have done I have welded up the original holes, tapped the correct size holes in the correct place, helicoil to be safe and then bolt up. Throttle cable I am making new ones to allow the TB to be in the correct place with no cutting needed, TB cable needs to be either extended or replaced


not to be rude or anything but tomato potato, anywayz, ill stop there! and i appreciate the reply towards the sump mod! i searched and searched and found the same thing! nobody wants to give any love on this! but there are a few good people still and they are the only reason my conversion is still going ahead!! not going to name names but you guys know who you are and thank you! and forgive the TAPPERS being mixed with the ROCKERS..

So by this I assume you expect those who are in business to make a living to tell you how to do this yourself, spend countless hours dealing with people for free while paid work is sitting there not getting done so you dont have to pay what is a reasonable amount for the time.....good luck with that.

Just wanted to clarify all that is required to do the 6g74 to 6g75 is blocl and heads? Can i use the rocker covers off the 6g74? Want to buy as little parts as possible. Also do i need to get my ecu retuned or is it reccomended to do so?