My 1988 LFX F40 build. (Page 2/66)
Daryl M JAN 12, 01:22 PM
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The exhaust is coming together. To get it to go where I want it I may have to shrink the bottom of the trunk a bit, but the plan is to keep the exhaust low and back in an attempt to get heat out of the engine compartment.

[This message has been edited by Daryl M (edited 01-12-2019).]

Rickady88GT JAN 12, 09:28 PM

quote
Originally posted by Daryl M:

fallout new vegas all legendary creatures

The exhaust is coming together. To get it to go where I want it I may have to shrink the bottom of the trunk a bit, but the plan is to keep the exhaust low and back in an attempt to get heat out of the engine compartment.



Just food for thought, I do not even have a muffler on my LS4 swap. I would see how it sounds and look into options before I cut out my trunk. That looks like a huge muffler, so maybe something else could save your trunk?
Daryl M JAN 13, 02:35 AM
Rickady88GT, I get where you are coming from, but I really don't mind loosing the bottom 3-4inches of trunk if I have a car I can have a conversation in and listen to the radio.
Daryl
Rickady88GT JAN 13, 12:24 PM

quote
Originally posted by Daryl M:

Rickady88GT, I get where you are coming from, but I really don't mind loosing the bottom 3-4inches of trunk if I have a car I can have a conversation in and listen to the radio.
Daryl



LOL, OK I get it. But it is not as bad as it sounds. I have Corvette C5 resonated tips. They are not a muffler, but do calm it down. My LS4 used to set off car alarms in a parking lot when I started it. Yes that was a bit much, but I never got pulled over for sound ordinance enfractions because it only got loud at above half throttle. The car would start with a computer controlled blip of the throttle that would get a low frequency boom,.car alarms beware. BUT it does not do that any more. I added a small glass pack to each of the tips. This was made up of a single 12" glass pack that I cut in half, and welded directly to the back side of the tips. Basically I put a very small muffler in between the rear tire and the rear bumper in a void that seems perfect for a small muffler. Now the car is calm. But part of the reason it is so calm is a stock tune, cam and cats. If I were to got crazy with mods.......it would be loud.
I recommend at least trying it or looking into it before you cut out your trunk.
Will JAN 13, 01:47 PM
I have an X-pipe and dual cats on my Northstar car. It's not Cadillac quiet by any stretch, but still conversable inside.

Your powertrain looks high on the cradle... maybe it's a trick of perspective, but it looks like the bottom of your oil pan is 3" or so above the bottom of the cradle. Is that to avoid additional cradle surgery for the bosses that would hit the forward crossmember or does the F40 transmission hit the left side rail if the try to go lower?

[This message has been edited by Will (edited 01-13-2019).]

Daryl M JAN 14, 11:08 AM
Yes, it would be able to go about 1.5" lower with cradle surgery to clear the F40, but I didn't see the point.
Will JAN 14, 05:21 PM
What muffler is that? If the internal configuration works, it might be easier to make the upper left connection the front bank inlet.

Does the 3.6 have a particularly shallow oil pan? I don't think I'd read that other engines could go lower when installed as low as they could be with an F40.

Edit: Food for thought on exhaust design: http://www.fiero.nl/forum/F.../000121-17.html#p660
X-pipe and dual cats fit WITHOUT cutting the trunk. Many tubing donuts were sacrificed to bring that to life.

[This message has been edited by Will (edited 01-14-2019).]

Rickady88GT JAN 14, 06:52 PM

quote
Originally posted by Daryl M:

Yes, it would be able to go about 1.5" lower with cradle surgery to clear the F40, but I didn't see the point.



Usually the issue is with deck lid clearance. You either cut and patch the deck lid or the cradle. That is, IF you run into clearance issues. I have had to cut a few deck lids for clearance issues.
olejoedad JAN 14, 07:53 PM
Not only decklid clearance, but you need to keep the center of gravity as low as possible.
Yes, 1 1/2" makes a difference!
Bottom of the pan should be on the same plane as the bottom of the cradle side rails, if at all possible.
Daryl M JAN 14, 10:57 PM
The way it sits now, I have about 7/8" from the bottom of the oil pan to the bottom of the cradle. I had not actually measured before. Guess it isn't as bad as it looks.
As far as keeping weight low, I think I am doing better than many swaps that have cast iron block and heads.

[This message has been edited by Daryl M (edited 01-14-2019).]