LS4 / F40 swap - fieroguru (Page 16/216)
Bloozberry MAR 19, 08:18 PM
I keep watching with bated breath (OK, maybe popcorn breath) for the flywheel design...
Raydar MAR 19, 11:07 PM

quote
Originally posted by fieroguru:
I am not sharing the application for this clutch just yet, but it is a non-GM application. It is a stock application and Spec offers a Stage 3+ version for it off the shelf.
<snip>



Ahhh. Cool.

<Going back into lurk mode.>
engine man MAR 20, 08:47 AM
Nice work just wondering why not just get a triple disc or dual disc clutch then there is no need for a flywheel just a flex plate will do

[This message has been edited by engine man (edited 03-20-2011).]

fieroguru MAR 20, 10:04 AM

quote
Originally posted by engine man:

Nice work just wondering why not just get a triple disc or dual disc clutch then there is no need for a flywheel just a flex plate will do




I plan for this swap to be my daily driver in the summer, so it must have docile street manners... you do not get that with a dual or triple disk clutch (plus a double or triple clutch will set you back $750 to $1500 vs. about $450). But for those who wanted to go that route, the 2300 ford's used in many racing applications came with the 23 x 1 spline and there are double and triple disk racing clutches available for them.
fieroguru MAR 20, 03:59 PM
Today was a good day for destruction... The test fit into the blue car showed a couple of areas that needed some additional clearancing.

As discusses a page or two ago, the factory frame notch on the driver's side was moved back 1" so it would better clear the F40:





I will leave it just tacked in place while the engine/tranny/cradle are test fitted again to verify 1" was the proper amount to move it.

Next the cradle needed some slight tweaks. The Magnaflow muffler is thicker than the Flowtech Afterburner I usually use, so I needed to clearance the rear cross-member slightly so I could raise it up more.


In addition to the rear cross-member, the factory exhaust notches in the cradle needed to be modified slightly. They were shortened about 3/8" and reshaped to better clear my exhaust pipes. This modification allows the Magnaflow muffler to fit without any modifications to the stock trunk. In this pic the bottom portion has already been cut back and the marker outline shows the amount to be removed:


The last modification was to the lower lip of the passenger cradle rail. The 2 1/2" exhaust runs within 3/8" of it and it needs more room for the enlargement to 3". I had kicked around trimming it for the entire length, but chose to just do the portion that is behind the oil pan.


After the next exhaust mockup all the cuts made today will be welded up and ground down smooth.
Bloozberry MAR 20, 09:08 PM
I'm sure you're aware, but for others that may not be, that cradle lip is just a weld-flange for easier automated spot-welding on the assembly line. You could've removed it entirely without any concerns.
Isolde MAR 21, 09:43 AM

quote
Originally posted by fieroguru:(needs to be 450 lb-ft +)



Why?
I've seen some engine dyno sheets for some built N/A 5.3s, none even reached 440 ft-lbs.
You secretly boring yours to 5.7L?
dobey MAR 21, 10:06 AM

quote
Originally posted by Isolde:
Why?
I've seen some engine dyno sheets for some built N/A 5.3s, none even reached 440 ft-lbs.
You secretly boring yours to 5.7L?



Read the thread. He's said multiple times he will likely add N20 or turbo later on.

440 ft-lb might seem like a lot for a 5.3, but the main thing holding that back is the DoD. It's a lot easier to get up to 450 ft-lb with a stronger valvetrain that can take you up to 7000+ rpm.
fieroguru MAR 21, 12:24 PM
I have decided on a clutch.

It will be a Spec Stage 4+ (solid hub and solid ring of friction material) of the version I just test fitted. The list price is over $600, but it includes a HTOB that I will not need, so maybe I can get the cost down some.

Yes the clutch is alittle overkill at the moment, but wanted to make sure it would hold any future upgrades (NOS, Turbo, stroker kit, or a 6.0, 6.2).
Bloozberry MAR 21, 05:32 PM
Ooooooo... I hope for you it's streetable. That's a lot of cashoolah if it turns out to be chattery at anything but higher rev clutch dumps. What's SPEC say about the holding power of it?