[DeTomaso] 400 Exhaust

[Will Kooiman]

That's what we call learning.

If you compare W vs. C

1-5-4-2-6-3-7-8
1-3-7-2-6-5-4-8


And then swap top-to-bottom 1&2, 3&4, 5&7, 6&8 becomes 1&2, 5&7, 3&4, 6&8
- so the tri-y's are the same regardless of the firing order.

I don't have a bucket big enough to hold my "learning adventures".

BTW, I had FPA Tri-Y's in my 428 FE Mustang.  I liked them a lot.  They
sounded crisper than Hooker Super Comps - plus they didn't drag on speed
bumps - which is why I made the switch.  My point is that I liked the
design of Tri-Y's.

On 9/4/12 12:53 PM, "gow2 at rc-tech.net" <gow2 at rc-tech.net> wrote:

>Yea I think that may have worked better but I had already moved the other
>direction. I am afraid there was only hind site in the first set. BTW I
>have the firing order 15426378
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>> In the previous headers, you paired the center pipes.  That's not
>>correct.
>>
>> You are supposed to pair 1&2, 3&4, 5&7, 6&8.  I'm not surprised that you
>> got lean/rich cylinders.  That's like using a camshaft with more lift on
>> some cylinders than others.
>>
>> I don't think it matters W vs. C firing order.
>>
>> Your current headers shouldn't have lean cylinders, but you don't have
>>any
>> scavenging.  I suspect that it's going to sound weird, but that's fun of
>> tinkering around.
>>
>> BTW, you know that 3" pipes fit very easily using the normal routing
>> through the suspension, right?  With your fab skills, it should be a
>>piece
>> of cake.
>>
>>
>>
>> On 9/4/12 11:39 AM, "gow2 at rc-tech.net" <gow2 at rc-tech.net> wrote:
>>
>>>Well I am playing with some things. First I wanted to get the exhaust
>>> over
>>>the suspension so I can increase the volume. I did not want 180's
>>>because
>>>I may want to come up with a make shit trunk at some point.
>>>
>>>180's are awesome as you can pair the correct cylinder which is
>>>something
>>>you can never do with a right L/R system due to the firing order.
>>>
>>>I originally built these to go over the suspension but the firing
>>>order/back pressure left every other cyl lean:
>>>
>>>http://www.rc-tech.net/cars2/panttransam/hpold.jpg
>>>
>>>You can never get an optimum system with the firing order so what I
>>>decided to do, since this was an engine based on lots of torq I decided
>>> to
>>>run each primary to the rear and collect them as far down as I could.
>>>
>>>The butterfly is just so I can play with back pressure.
>>>
>>>I can't wait to hear it on the car. On the stand the sound is fantastic
>>>and I think it has to do with being in earshot of each cyl exit in the
>>>can.
>>>
>>>Gary
>>>
>>>>
>>>> In a message dated 9/4/12 9 22 40, b.hower3400 at yahoo.com writes:
>>>>
>>>>
>>>>> I agree with David, I would vote for the chrome tips.
>>>>>
>>>>
>>>> FWIW, me too!
>>>>
>>>> Gary--can you explain how your mufflers are designed to work?   They
>>>>look
>>>> very complicated and I'm sure there's lots more going on there than
>>>>meets
>>>> the
>>>> eye?
>>>>
>>>> Mike
>>>
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