Project Thread 3.3ltr whipple into Ls400

[hypronet]

If you can get 700hp at the wheels you've spent a lot of money on goodies to go inside the engine

With the homework we have sort off done on the engine, we expect about 800-900hp at the flywheel if the maths is correct. This should give us about 600-700hp at the rear wheels depending on tune, fuel etc.
A Little bit of extra $$ has gone into the engine insides "if you look at list at start", an it has been setup for 1400+hp if i wish to run over 30+ psi, but i built to run around 20psi an too last and not drop it guts after a dozen runs?

 

[spf_lexus]

great info. thanks a bunch. So for the swap do I need the pumpkin too? or just the diff inside? Im not a gear head yet and dont know what im doing but plan on sending the LSD + car to a driveline specialist for the job. So when they crack the diff out they should clearly see where the bolt needs to be fabbed?

 

[hypronet]

great info. thanks a bunch. So for the swap do I need the pumpkin too? or just the diff inside? Im not a gear head yet and dont know what im doing but plan on sending the LSD + car to a driveline specialist for the job. So when they crack the diff out they should clearly see where the bolt needs to be fabbed?

LS400 Diff center has 3 mounting points to the subframe, but the supra center has 4, so you need to drill and weld an extra nut in place so you bolt the spra diff up correctly

 

[spf_lexus]

hypronet thanks man appreciate this golden info. Is this why my stock diff has the 2 bottom mounts and only 1 on the top? It looked weird 1st time I checked out what I had. the standard SC diff has 2 bottom 2 top so this makes sense. So for this to mount properly I should drill thru and make a reliable mounting hole for the extra mounting tab?
sufficient metal to tap?


Sorry for the barrage of questions but you seem to be the only person thus far that has any knowledge on the early LS diff. I plan on sourcing a used one from a wrecking yard and re-build and then once build the fabbing begins

 

[JBrady]

great LS man...hey I have been trying to squeeze an LSD into my LS for a while now.... You said you used a supra? was that n/a or turbo? I thought they would not fit. What was the process like? straight swap?


JBrady hey can i swap a subframe + LSD from supra turbo? I mean would the body bolt into the same locations? Also I would in effect have an LS suspensio in front and supra in rear? lol would this mean i would have to get 2 more coilovers too? sounds like a huge job.

I am unsure on the interchangability of Supra and LS subframes. Hypronet installed his by creating at least one new bolt location as the LS up to 1997 used a 3 bolt differential housing and the Supra (and SC and GS4xx and LS from 1998-2000 at least) use a 4 bolt differential attachment arrangement.

I am not sure how Hypronet got away with only 1 new attachment point as both front attachment locations look different than the single LS setup.

Here are some pics of the LS 3 bolt carrier.

 

[JBrady]

Another view of the LS housing

Here is the 4 point differential layout from a Lexus manual. Notice the front mounting points are located on arms like a hammerhead shark. Compared to the single mounting point on the LS that is much closer to the imput on the pinion. It would seem that 2 mounting locations along with engineering to create proper clearance and strength would be needed. Not sure how Hypronet has done it with only adding one mounting location. Maybe he can post some pics.

 

[scotturnot]

This will be a impresive build! Can I ask why you went with a 3.3? The W140 2.3 would be enough would it not? Just wondering becuase I am about to make a supercharger purchase.

 

[hypronet]

I can arrange some pictures soon of the diff mod.
What was done was, supra diff center into ls400 subframe.

As was stated above ls400 diff has 3 bolt locations where it mounts onto the subframe. Supra diff has 4 bolt locations where it mounts.
You line up the supra center inside the ls400 subframe, make where the 4th bolt goes, then you need to drill and weld extra nut on subframe to bolt the 4th bolt into?

I had to change the yoke on the tailshaft to match the supra diff

Done

 

[hypronet]

This will be a impresive build! Can I ask why you went with a 3.3? The W140 2.3 would be enough would it not? Just wondering becuase I am about to make a supercharger purchase.

The only reason why i went the 3.3 was due to boost and hp.
With the hp i was chasing and running a 2.3 i would off needed to push a higher psi "25-30+"which would generate a lot off extra heat and lessen the durable life of the combo.
With a larger blower running a little less boost " about 20psi, with pleaty in reserve", your able to get same hp with less work and stress on parts and you should get better life out off the combo too.
I may be wrong, but thats my way of thinking!

 

[spf_lexus]

hypronet- gotcha... I would love some pics of the diff. So you used the stock 3 locations and just welded a large nut above the mount? What im asking is does this bolt onto the 1 existing "arm" and still line up? supra arm mounts look longer in the pics and didn't know if 1 of the mounting arms on the supra diff would line up w/ my subframe... I guess it should if you only needed to fab 1 arms (side).


Technically if the yolk lined up I could bolt this sucker right in and have an extra arm "dangling" and then once mounted add the extra welded hardware. If so this makes it pretty easy to fab... 3 of 4 bolt locations is enough IMO to hold "in place" for the 4th to be welded.

 

[hypronet]

Im still arranging some pic's off the diff setup.

This is what had to be done.
Remove rear finn cover off supra diff and replace with std ls400 one.
mount supra diff in ls400 subframe an bolt the rear up.
where the 2 bolts line up on the front off the diff to subframe, these have to be redone.
drill 2 holes and weld in some nuts (that fits the bolts) into the subframe to bolt the 2 front mounts into.

 

[hypronet]

On another note.
Engine is done, finally have got it all together.
I have some paper work on the port work done on the heads, 210cfm@450hp
I think i read somewhere that the heads are rated at about 130cfm?
Im waiting to see the before an after flow results but i think the $1K spent on it was well worth it doing the porting.
Now its time to fit the engine/gearbox together in the car, once this is done then we mount the supercharger and do the 2 airboxs, 1 each side. Finish off the wiring and pluming for the fuel an oil. Running 2 external oil coolers with filters, 1 for engine an other for trans.
Then it should be ready for first dyno run?
Not long to go now

 

[White ls400]

Where in nsw is this Id love to see it

 

[hypronet]

Where in nsw is this Id love to see it

Located in sydney south-west metro area.

Its still in the workshop getting the finishing work done on it, an plan to have it on the road first week off November.

 

[hypronet]

On another note.
Engine is done, finally have got it all together.
I have some paper work on the port work done on the heads, 210cfm@450hp
I think i read somewhere that the heads are rated at about 130cfm?
Im waiting to see the before an after flow results but i think the $1K spent on it was well worth it doing the porting.
Now its time to fit the engine/gearbox together in the car, once this is done then we mount the supercharger and do the 2 airboxs, 1 each side. Finish off the wiring and pluming for the fuel an oil. Running 2 external oil coolers with filters, 1 for engine an other for trans.
Then it should be ready for first dyno run?
Not long to go now

The flow results above for the heads, are from the stock heads after 120k km's, have not got the final resorts fof the heads after porting, but will have them in the next week including some pic off the engine/ head ports and blower manifold

 

[kaivearn]

very interesting build mate. how much did the LSD conversion cost you in total? would sound like a fair bit.
and what brake setup are u using?

sorry for so many questions... but was just curious as a fellow ls400 enthusiast

 

[hypronet]

very interesting build mate. how much did the LSD conversion cost you in total? would sound like a fair bit.
and what brake setup are u using?

sorry for so many questions... but was just curious as a fellow ls400 enthusiast

I was very lucky with the diff, me and 2 other mates where after a wrecked supra an we found a non-turbo 6speed going for a song.
The cost on the conversion was cheap, as im a fitter/welder and my mate is a licenced mechanic (who works for a jap importer), i would say the cost to do the job would be around $3k but this would depend on the condition off the diff you get and where you go.

 

[cribbj]

I've heard about these JDM non-turbo 6spd Supras and am curious which diff code it has, if you can find it, or do you know the final drive ratio?

Just curious if it's the same as the turbo 6spd diff's that we have in the USA.

 

[hypronet]

I've heard about these JDM non-turbo 6spd Supras and am curious which diff code it has, if you can find it, or do you know the final drive ratio?

Just curious if it's the same as the turbo 6spd diff's that we have in the USA.

I dont know the diff code, but can tell you that it had a torsion centre with 4.1 ratio:smokin:

 

[JustenGT8]

Still an A series John, only the turbos got the larger B series