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Discussion Starter #1
Ladies and gentlemen, I am officially stupid. All this time, I have been conviced that my IMRCs default closed. I was W R O N G! My article is wrong as well. My IMRCs default OPEN. What this means, my friend, is that I have my MSD switch operating all wrong-- it's all backwards. Instead of having closed butterflies at lauch, they were always open and they closed when I got up to 3400 rpm.

"But what does this all mean?" you may be asking. What this means, my friends, is that my pretty impressive dyno sheet is gonna be a whole lot more impressive. I thought I had torque before? I can't wait to find out what it's gonna feel like when this thing is setup properly. I think there is a chance I will break 200 rwhp (fingers crossed).

I am kicking myself, but I am happy. I would have never known had my lower intake gaskets not failed. So, now I need help.

I need to figure out how to make my negative trigger MSD switch work as follows (backwards from current). The negative trigger needs to be supplied constantly until 3400 rpm. That's when I need the negative (gorund) to be interrupted and stay interrupted until redline. I think I can flip the negative trigger role with a relay, but I don't know how.

I probably will post this in the electronics section.

PJ
 

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13's or Mildly Broken
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Rock on PJ! Good luck hitting the 200 mark. I've been waiting for someone to do it and looks like you may get the honor.

-Andy "Melon"
 

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splitport 3.8L's have been hitting 210rwhp with JUST a cam. You need RGR to grind ya one up. I think 210rwhp/250tq is possible without any head/intake work.
 

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Yeah a relay sounds like your best bet. Something that is supplied with constant power until a wire (from the MSD trigger) hits the relay and turns it off.

That's awesome it's kinda like an early christmas present. FREE POWER!

-Thomas
 

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You can definitely do it with a relay, PJ. I work alongside an electrical engineer. He says you can buy a normally closed relay that interupts the ground circuit when it gets a ground signal from the controler. You can probably call a manufacturer and tell them exactly what you need. They should be able to give you a part number and a contact at a local vendor to buy it from. Just make sure you use a relay that can handle amperage load of the solenoids continuously. Then just follow the wiring diagram that comes with it and your home free. Should be a pretty inexpensive too.

Awesome news though. Let us know how it turns out.

Carlo
 

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I'd say have a mod reopen your 4.2 swap article briefly so you can include the instructions for the relay you now need to do it correctly.
-Thomas
 

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Discussion Starter #7
Yeah, that or re-write/revise it and submit it for the articles section.

PJ
 

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what, no cam yet :2huh:

:D

if you knew the woeful stock cam specs
then you would have changed cams
b4 the swap
:ztoohot:

What is the weight of your 'Bird
and a stock F-150? You can
tolerate a bit more cam than
a heavyweight truck probably.

You need one of these:



Oh, you said it does not fit so try this incomplete upper :)


I have plenums to go on there, still needs work!
 

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here's a dyno of a small cam on a 3.8 split port, no porting...
It is the second generation of RancherLee's cam, I'm in
the third gen now...



it made 210 RWHP @ 5200 RPM (they stopped the pull)
I added the curve up to 6K but actual results may vary...
 

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our cars weigh 3450-3550lbs. depending on options. Mine with every option (including the 95SC leather interior/seats I added) except the moonroof hit the scales at 3580lbs at work on the certified truck scale with my 17" wheels, full size spare, full tank of gas, and nobody in the car. I hit the scales at the track with me in the car, 1/4 tank of gas, and spare/jack removed at 3750lbs.
 

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You need one of these:



Oh, you said it does not fit so try this incomplete upper :)


I have plenums to go on there, still needs work! [/B]
Is this the RGR upper intake I've been reading about?

RGR, welcome! :thumbsup:

Joe
 

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RGR,

How much do you sell the completely worked mustang style splitport upper intakes for? I already have a set of ported heads sitting here, so if the upper intake isn't too much, I may just go ahead and tear the engine apart around Christmas.

-Rod

P.S. - The mustang style splitport intake can be made to fit in our cars with the stock hood, it just takes a little work.

 

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Discussion Starter #13
No, no cam yet...:rolleyes: I really knew next to nothing about the 4.2 when it went in two years ago. I just wanted to get my car running since it had been down and out for almost 6 months when my head gasket blew.

I'd love to have a cam in my car, but I seriously can't even afford my own gas since I am planning to relocate within a month. I won't be spending until I start my job as a personal trainer in Socal, but enough of that...

How about a sponsorship! C'mon-- you could sponsor the fastest MN-12 non SC V6 in the nation (that us until Rancher makes it official and goes to the track)! Gimme a cam and I will wear your co's banner like a medal. :D Just a thought.

Call me stubborn, but I don't want to switch to a mustang intake. I guess it's 'cause I already modified my Cobra R hood, bulge and all, and I like the way the truck upper makes people stop in the drag strip lanes. I get MANY perplexed looks and Qs. I think I'd lose that with the Mustang intake. Besides, aren't the longer runners and larger plenums beneficial for my heavy bird?

RGR, keep me updated on your poly-hone project. It seems like an aweful amount of effort to port and polish a truck upper manually.

PJ
 

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PJ all you need is a double throw relay one side is normal open the other side is normaly closed and it flips when power is supplied to the coil!

have the negitive run through the normaly closed side and have you trigger control the coil to open it at you 3400 rpm spec. till it hit red line the close it back!
 

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Discussion Starter #17
Woah... Thanks for the reply 5.0 Chero! I guess I should have posted that I already resolved the problem in the same way you described. It works great!

PJ
 

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Well Sorry I was too late to help you. But I tried:D
 

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racecougar said:
RGR,

How much do you sell the completely worked mustang style splitport upper intakes for? I already have a set of ported heads sitting here, so if the upper intake isn't too much, I may just go ahead and tear the engine apart around Christmas.

-Rod

P.S. - The mustang style splitport intake can be made to fit in our cars with the stock hood, it just takes a little work.

I'd take $400 + core for the one I have there, It's available!
LMK if you are interested, it's really a good flowing upper.
Suitable for a stroker too :D
 

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Rodeo Joe said:

Is this the RGR upper intake I've been reading about?

RGR, welcome! :thumbsup:

Joe
Hi Joe!
 
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