89 w250 close to stock how will i do in my local sled pull?

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89 w250 close to stock how will i do in my local sled pull?

Postby ahale2772 » Fri Aug 14, 2009 5:52 am

i have an 89 w250 4x4 dana 70 rewar 307's 33 inch bf all terrains 1 screw in on the fuel screw 4 inch exaust but thats about it the truck has the 727's stock converter is ity worth trying it out in my local truck pull or am i just gona break stuff and look like a fool???
84 CCLB W350 project
94' W350 Dually, Diesel, Auto 1080HP/1980FTlbs
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Postby 93_Fummins » Fri Aug 14, 2009 6:25 am

If you don't break stuff, you're not trying hard enough!

I'm no expert, but I think the 3.07's will make it tough on your tranny and converter, even in low-lock; and the 33's, even though they aren't huge, will only make it all the harder with that ratio. It doesn't sound like you're making any serious numbers, so I'd give 'er hell just for the fun of it.

Do you have a pyro? Not sure what the heat will be like with only one screw (especially since I went straight to runaway with mine), but I recently burned a piston so I'm a bit gun shy with heat nowadays.

I'm sure others with far more experience will chime in, but I'd give it a shot. Like I always say; I'll try anything once...twice if it tastes good 8)
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Postby ahale2772 » Fri Aug 14, 2009 7:28 am

yeah i have also herd the 307s are steep and yeah i want to do a pyro but cant figure out how to drill and tap the manifold without filling the turbo with metal shavings
84 CCLB W350 project
94' W350 Dually, Diesel, Auto 1080HP/1980FTlbs
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Postby 93_Fummins » Fri Aug 14, 2009 7:35 am

I took the turbo off and stuck a shop vac in the exhaust manifold when I did mine, but I also nad to have the turbo off anyway for a HTT Stage IV compressor upgrade.

I did one on my buddy's '91 with the turbo on. I covered the drill bit in grease to catch the shavings and right when I was about to drill through, I had him crank it to blow any shavings out. Not exactly a fool-proof way of preventing shavings in the charger, but it's the way that is suggested for the DIY'er in most instructions (Autometer, Banks, Snow...all "suggested" this method as an alternative to disassembly) but realize that it's probably not going to work 100%.
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Postby Richie O » Fri Aug 14, 2009 9:06 am

RSWORDS on here has that set up and he pulls. Is it ideal,, no, will it work, YES.
1989 W250 727, 3.07 L/S, S300, P/S Intercooler, Stans exaust, Pump adjustments, 127k miles,297 hp
1993 W250 extended cab, rag, 4.10 l/s, 6x16's, HTT 62/71/14 piston l/p, Isspro EV series tach, fuel pressure, boost, oil pres, water temp, volt, pryo, 132k/ 301 hp
1992 W250 with NV4500, 3.54's, 16cm 60mm GDS H1C, ground stock cone, Isspro tach, pryo, boost, fuel pressure, slow, rusty, dented,180k
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Postby ahale2772 » Fri Aug 14, 2009 11:20 am

im thinking im gona pull the turbo off better to weld a threded bung on the manifold or just tap the manifold itself??
84 CCLB W350 project
94' W350 Dually, Diesel, Auto 1080HP/1980FTlbs
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Postby ahale2772 » Fri Aug 14, 2009 11:25 am

if i weld up a home made intake horn and some biger tubing to my stock turbo will it give me any more flow???
84 CCLB W350 project
94' W350 Dually, Diesel, Auto 1080HP/1980FTlbs
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Postby 93_Fummins » Fri Aug 14, 2009 11:53 am

The manifold is thick enough to tap. Be careful where you drill though because there is a partition fin in the manifold where the runners for the front and back ports come together at the flange.

A more free flowing (bigger) intake system will help reduce any flow path restrictions, which is a good thing. Your overall flow is limited by your compressor, but the less restrictions there are the less the compressor has to work to get around/through them.
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Postby RumbleFish » Fri Aug 14, 2009 2:00 pm

http://www.pdrdiesel.com/oldsite/TechPyroInstall.htm

ive had good luck using a round magnet from a cb antenna base. grease the drill bit and the tap, and make sure you fish out as many shavings as possible. i use one of those magnets inside the shaft of a screwdriver, it works well.

your truck wont do so great in stock form because, well, its stock. but go out and have fun, and try not to break it. do as MMiller says, and crank the smoke screw down so it at least looks cool.
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Postby dpuckett » Fri Aug 14, 2009 2:34 pm

I've tapped many manifolds with grease on the bits and tap and have had no turbo issues.

DP
His- 93 W250 club cab LE, auto to Getrag conversion, piston lift pump, 3.54 LSD. 400k+
Hers- 04 QC 4x4. Built auto, Triple Dog, Air Dog. Funny Round truck that aint so quiet.
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Postby Ace » Fri Aug 14, 2009 4:33 pm

Just drill and tap it, no worries. Afterwards, start the engine for a few seconds with the intake hose off and look to make sure the impeller is spinning. If not (unlikely), shut down, turn the impeller backwards to release anything that got stuck over on the turbine side, and repeat. Whatever comes out inside the manifold will normally get blown harmlessley out the exhaust with no intervention on the tapper's part whatsoever. 8)
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Postby ahale2772 » Fri Aug 14, 2009 6:57 pm

okay ill give it a go and post some pics of how it went and a couple of my ratty power ram :)
84 CCLB W350 project
94' W350 Dually, Diesel, Auto 1080HP/1980FTlbs
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Postby ahale2772 » Sat Aug 15, 2009 10:42 am

any ideas on putting the probe after the turbo?
84 CCLB W350 project
94' W350 Dually, Diesel, Auto 1080HP/1980FTlbs
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Postby Richie O » Sat Aug 15, 2009 10:58 am

ahale2772 wrote:any ideas on putting the probe after the turbo?


I have an idea,, DON'T. It will give you a incorrect reading about 300 degrees lower then what it actually is. Do the manifold one. Be sure to drill in the correct spot.
1989 W250 727, 3.07 L/S, S300, P/S Intercooler, Stans exaust, Pump adjustments, 127k miles,297 hp
1993 W250 extended cab, rag, 4.10 l/s, 6x16's, HTT 62/71/14 piston l/p, Isspro EV series tach, fuel pressure, boost, oil pres, water temp, volt, pryo, 132k/ 301 hp
1992 W250 with NV4500, 3.54's, 16cm 60mm GDS H1C, ground stock cone, Isspro tach, pryo, boost, fuel pressure, slow, rusty, dented,180k
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Postby dpuckett » Sat Aug 15, 2009 12:42 pm

300 is a good guideline if you dont push a near-stock truck. I've had differences of 500+ in a hopped up nonIC 91.
His- 93 W250 club cab LE, auto to Getrag conversion, piston lift pump, 3.54 LSD. 400k+
Hers- 04 QC 4x4. Built auto, Triple Dog, Air Dog. Funny Round truck that aint so quiet.
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