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Discussion Starter #1 (Edited)
So I'm planning to put this:



EDIT: THE E153 IS A HUGE TRANS AND I COULDN'T MAKE IT FIT THE MR-S. SWITCHING TO THE GM F40.



Into this:



After much haranguing of my wife, i finally got the green light to start buying stuff

The general timeline of this project:
August '14: buy an LS4 and an E153
Sept-Oct '14: digitize the E153 using a faro arm and design a 1/2" thick aluminum adapter plate to get the motor mounted to the trans
Same time frame: butcher an OEM mr2 turbo flywheel to compensate for ls4 crank flange and length added by adapter plate.
Nov '14: run out of money
Feb '15: beg wife for more money and buy a widebody roller


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Discussion Starter #2
Pics of the LS4, E153 and adapters:









Above: you can see where the e153 passenger side diff cover had to be notched.


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Discussion Starter #3
In February of this year my wife and I decided to fund this crazy project and fairly quickly I found a great deal on a partially swapped (2GR) widebody, hardtop 2000 MR-S.

Because in recent months I've been having to tow a lot using my wife's van and wasn't about to subject our Odyssey to a cross-country tractor pull. So I sold my nearly new 2015 STi and bought an F150... Nuts huh?





It's like the truck version of the car (black on black)... Except it can tow 10000 lbs.

Drove halfway across the country and met a great guy who for his own reasons needed out of his project. I tried to absorb as much tribal knowledge from Tom and pack as many parts as he'd let me take and we made our way back to Houston like Sanford and sons.



Cars in great shape, has two bodies, and is basically exactly what I need.






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Discussion Starter #4
So now it was time to try to shoehorn the drive train into that tiny engine bay. In typical fashion I undid the crossmember and took off the bumper beam and rolled the motor underneath the body... Here's what I found:







With the accessory drive pushed about 1/4" from the passenger side frame-rail. The e153 protrudes about 3.5" under/through the driver side rail. That's some serious notching.

Total length of the LS4 + adapter + E153 is 39.5". Width between the mk3 rails is right at 36.5". I think that pretty much sums up the issue.

So feeling pretty dejected I thought I'd have a go at the f40. This would cut me down by about 2.5". Still tight, although I think that's a notch I can live with.

FWIW, at about 15-20 degrees rotation rearward there doesn't appear to be any issue with the LS4s width (fit up with headers on)








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Discussion Starter #9
Haven't even started there yet. I'm getting prepped to notch the unibody (have a simple plan for this) and my f40 should come later this week... The e153 is way too long without getting drastic. I'll keep it in case the f40 isn't as easy as I think.

Do you have any advice for me on the motor mounts? I was thinking of mounting only using the motors head bolts on the forward side and mounting low to the crossmember on the aft side. Then transverse on the tranny.


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Any info on the flywheel you used?
Ive also been lightly looking into a ls4 swap. Pretty cool to actually see someone moving forward with it.
 

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Discussion Starter #11
Flywheel is an OEM sw20 turbo flywheel. I machined the hub out of it and added a spacer/adapter (1 piece) so that it had the ls4 pattern on it and out the ring gear and friction surface in the same spot as the tranny was used to having them.


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Any info on the flywheel you used?
Ive also been lightly looking into a ls4 swap. Pretty cool to actually see someone moving forward with it.
cant really see where to mount it from your pics.. but the transmission holds 3 of the 4 mounts needed to make this swap work.. so the hard part is done for you.

Its up to you.. but to keep the swap simple.. I would see if you can cut into the frame so you retain the e153.. but before any of that is done.. have you taken any measurements? width of ID on chassis vs length of engine/trans combo end to end?
 

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p.s.

not sure what it will output with the MR2 trans.. But this guy made almost 400 with a stock long block.. well with cams..


list:
5.3L LS4 - stock heads and lower end
224/232 New Era DoD camshaft with pushrods/springs
Stock LS2 intake, injectors, Throttle body
Stock LS7 MAF and exhaust manifolds
4" cold air intake
Magnaflow 3" in dual 2.5 out exhaust

WHP/TQ 380/335

this will be fun NA in a MR2..

http://www.fiero.nl/forum/Forum1/HTML/092251.html
 

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Discussion Starter #15
At this point I can't really even think about mounts because I can't even get it up into the engine bay.

So E153 vs F40:
E153
Pros: LSD, will tolerate even a supercharged V8 (600), easy integration into the spyder for both motor mounts and linkages, has a trans side starter provision
Cons: 5-speed, geared for a 4 cylinder (theoretical top speed is 155 and cruising rpm is 2900 @ 65), total drivetrain length (when paired with the LS4) 39.5", requires an adapter to both the flywheel and the motor.

F40
Pros: 6-speed, geared for a more torquey engine, direct fitment to the LS4, total drivetrain length should be closer to 36" (unverified)
Cons: no LSD (although they're available), no starter provision, not as much torque capacity although FieroGuru's running 380 whp @ 2800.

To get the e153 in there I'm going to have to open up a hole into the wheel well... The f40 is relatively minor... I'm going to try it first before I get that drastic?

Poll to the group: which way would you go?


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Don't you think the starter issue will be more challenging to overcome than the wheel well hole? Or is this hole going to be insanely large?
 

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Discussion Starter #17
It's funny how different tools make you think about problems in different ways... For me it's relatively easy to generate a model to have a starter boss machined into the f40 vs the entire transmission protruding into the wheel well (about a 10" round hole). I'd rather notch the frame rails of the unibody and push them out with a jack than arch that hole and attempt to put back in enough strength to have it functional...

Not saying it won't come to that, it's just that the f40 appears to be the easier path.


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are you cutting the wheel well or chassis? looking at the pics you posted it looks like the chassis.
 

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Discussion Starter #19 (Edited)
p.s.

not sure what it will output with the MR2 trans.. But this guy made almost 400 with a stock long block.. well with cams..


list:
5.3L LS4 - stock heads and lower end
224/232 New Era DoD camshaft with pushrods/springs
Stock LS2 intake, injectors, Throttle body
Stock LS7 MAF and exhaust manifolds
4" cold air intake
Magnaflow 3" in dual 2.5 out exhaust

WHP/TQ 380/335

this will be fun NA in a MR2..

http://www.fiero.nl/forum/Forum1/HTML/092251.html
I'm running a similar setup:

*edited: SEE POST 46 FOR WHAT I'M RUNNING.

Tune software is still up in the air, but I suspect I'll use an LS2 manual ECU and adapt it to the now nearly native LS4 hybrid thing described above.

Should definitely outperform that Fiero, he's low on torque.
 

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Discussion Starter #20
are you cutting the wheel well or chassis? looking at the pics you posted it looks like the chassis.
E153 requires both cutting the main tubes of the chassis and getting into the wheel arch.

The F40 comes tomorrow and by calculation it's only going to interfere with the main tubes.

I will try to do a decent job of documenting what's being modified and how I'm doing it.
 
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