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Msd Window Switch Rpm Limits

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Old Nov 8, 2005 | 12:24 AM
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dirt track racer 81's Avatar
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From: Hennessey, Oklahoma
Default Msd Window Switch Rpm Limits

I'm thinking about running a MSD Window Switch on the nitrous kit that I'm getting. I plan on running a 100 shot, it's a Cold Fusion Wet Kit.
First of all, would a window switch be worth running on my truck?
If so, which rpm pills should i get for it? I really don't know what pills to run, I was thinkin anywhere from 2-2300 to 55-5900. My 1>2 shift it 5900, 2>3 shift i think is 5700.
Any help would be greatly appreciated.
Thanks!
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Old Nov 8, 2005 | 12:45 AM
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Get the MSD digital window switch so you can adjust in 100 rpm increments. Shut the nitrous off at 5800 so the last 100 rpm will clear the nitrous out of the intake. Not necessary for a 400rpm cutoff before the shifts. Yes you need a window switch for your truck especially if you dont have a built tranny. Spraying thorugh the shifts on a nitrous vehicle is the number 1 killer of trans that and the planetaries off the line. I would make it come on at about 3000 otherwise you run the chance of puddling th intake and boom your intake blows up.
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Old Nov 8, 2005 | 01:10 AM
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Alright that's a good enough reason to run one for me. A tranny will probably be the next thing i get, what kind of built tranny would you prefer?
thanks for the info!
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Old Nov 8, 2005 | 01:12 AM
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I went all out on mine so it would last and I still dont think it will last with the 418 here is a copy paste of a pm I sent a guy a few weeks ago
$40 - 29 element sprag
$50 - Alto Forward & Low/Rev clutches
$20 - Alto 2-4 Band
$65 - Alto 3-4 clutch pack, full thickness clutch and steels
$60 - Billet OD servo
$40 - Input Drum reinforcement kit
$10 - Aluminum accumulator pistons
$35 - Beast reaction shell
$15 - TransGo plate
$115 - HD reaction carrier shaft
$25 - High RPM 3-4 spring pack
$7 - Hardened Pump rings
$130 - all new solenoids and harness (except EPC dont need as you go vac)
$15 - Sonnax check valve

$170-420 - hardened or billet output shaft
$90 - Vac modulated Shifts


This is a list of what you would need pretty much. Get a transgo hd-2 shift kit vette servo and a billet od servo if you plan WOT 4th gear shifts. I got a hardened shaft and it seems to be taking the torture of offroading with 33's. Oh and a big azz tranny cooler heat is the main enemy. If you really dont want to have anything to worry about get the 5 pinion planetaries get factory gm ones not aftermarket I know it sounds weird but the factory ones are powdered metal and they are much stronger than aftermarket. My tranny cooler is a 40,000 gcvw and it keeps it nice and cool(150*). Vac shift stuff is if you want to do away with the EPC solenoids which controls line pressure(ie shift firmness) you replace it with a ford C4 unit me personnally I wouldnt do this cause you have to run a vacuum line and all that bs. Let me know if you have any questions. The prices are approximate. I got my stuff from 4l60-e.com.
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Old Nov 9, 2005 | 12:06 PM
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I really like the window switch. Mine is usually set at 3000 on and 6400 off, but at a crappy hooking track, I usually have to go up to a 3200 or 3400. Gives me just enough room to hook it up better. Its a great safety feature to have IMO.
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