Little tweaks for power on a 93 250

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Little tweaks for power on a 93 250

Postby ahale2772 » Tue Jul 19, 2011 7:58 am

Got a 93 w250 in the shop that I just did 5600 bucks worth of work to, he asked for some tweaks for a bit more power / drivability. I cranked the fuel screw up to the collar, rotated the stock pin and turned the starwheel down 1 turn( it bottomed 1 turn down?... Weird IMO, didn't look like anyone had been in there before)

Anyways, I just want to give him some more low end grunt to get the truck moving, what I've done gave it a bit more but fuel seems to come in late still ( lays a healthy cloud when it does though)

Is the exhaust housing holding me back? Spools real late ( can't see if it's a 18 or 21 cm housing) truck is a 5 speed

Shall I give it some timing to help spool?

I'm not gona do gauges yet, he drives it like a granny and does not tow, just want to net him some more low end to get the truck up to speed faster

Don't see how a gov spring would help, I'm sure he won't rev death out of it to see any rpm fueling gains

Thanks
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Re: Little tweaks for power on a 93 250

Postby diesel freak01 » Tue Jul 19, 2011 8:07 am

honestly i have noticed the lack of low end in my truck. you may have the star wheel too far down allowing full fuel to early before turbo spool, you may just need to crank it up just a notch or two and see what that gains you. he should have the 18cm housing on the turbo so that shouldnt be the issue. o and GAUGES GAUGES GAUGES lol. timing may help a little as i havent done that yet but its next on the list right after the lplp upgrade i have to do.
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Re: Little tweaks for power on a 93 250

Postby ahale2772 » Tue Jul 19, 2011 8:16 am

One would think it's fueling too hard down low not letting the turbo do it's thing but it's not smoking till the turbo lights, definitely afc tuning, but with the starwheel bottomed the only thing I can see not letting the fuel come in is low boost not actuating the afc/ hence not letting the turbo spool. Like I said it lays some thick smoke when the fuel does come in and I can see the fuel pin is traveling full due to the marks in the white lithium grease on the fuel pin

Maybe I shall play with the smoke screw... Didn't think of that... DOH :oops:
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Re: Little tweaks for power on a 93 250

Postby diesel freak01 » Tue Jul 19, 2011 9:38 am

well since it isnt fueling til the turbo lights maybe try taking the spring out from under the pin and see what that does? cant hurt to try i guess.
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Re: Little tweaks for power on a 93 250

Postby Remps » Tue Jul 19, 2011 10:01 am

Turn the smoke screw down till its flush with the nut and try that.
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Re: Little tweaks for power on a 93 250

Postby ellis93 » Tue Jul 19, 2011 10:34 am

Alex, my truck is the very same way but with the M2 pin. Truck alone its almost in turd territory till the turbo lights, then it pukes black and strolls. I have the smoke screw half way in the jam nut and its still that way. Only reason I've not changed any thing is when I pull, its a whole different animal. Things got really good power and egts stay in check with a peak at 1150 to 12. I've not messed with my fuel screw thou.
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Re: Little tweaks for power on a 93 250

Postby ahale2772 » Tue Jul 19, 2011 11:02 am

yup sounds just like it Ellis, power is there when load comes up, but just be-bopping around town its kind of guttless down low.

definitly going to give her somesmoke screw and go from there... is there any advangtage to taking off that nylon washer around the fuel pin? never really noticed a difference with it on/off of my truck...but then this 93 is probably making out at 25psi of boost when mine can wack twice that
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Re: Little tweaks for power on a 93 250

Postby ellis93 » Tue Jul 19, 2011 12:00 pm

Mr Richie mentioned it and suggested removing it. I did and found a little more movement up the pin and it felt better up in the rpms. Still soggy on the bottom.
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: Little tweaks for power on a 93 250

Postby oldestof11 » Tue Jul 19, 2011 12:50 pm

5 spds and our 1st Gen stock housings do not mix well. They do take forever to spool. For more seat-o-the-pants feel, get a 12cm housing.
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Re: Little tweaks for power on a 93 250

Postby ellis93 » Tue Jul 19, 2011 1:55 pm

I have a 14 now. Had a 12 on and I felt no diff in the two. With that being said I only noticed the lazy pick up after the pin and to ever really get it tolerable I had to sink that pin with nearly all the smoke screw. I've been toying with the idea of turning the fuel up but the egts that I'm running makes me leary of it. If only I didn't work it :roll:
93 D250 ,5 speed,4.11s,k&n autometer tach pyro trans boost guages,GDS 60mm h1c 14cm,honed 5x10,hplp/reg,1/8 timing,M+H M2 fuel pin, tims cooler tubz
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Re: Little tweaks for power on a 93 250

Postby ahale2772 » Tue Jul 19, 2011 5:32 pm

Smoke screw made all the difference in the world, gave a slight haze at part throttle and let's the truck get up and out of it's own way a bit better, turned it down till the lock nut only had 1.5 threads to grab on.

Owner came and test drove it tonight, happy as a pig in sthi! " worth every penny, thanks"... Never herd a customer say that after a big bill ... So happy he wants a fuel pin and a gov spring soon :grin: cool!
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Re: Little tweaks for power on a 93 250

Postby Richie O » Tue Jul 19, 2011 6:37 pm

Just be sure to keep an eye on the egt's. My 92 with a 16cm and a 60gds with stock injectors, tamper cap on the pump, high idle removed, ground stock pin will get to 1300 plus towing heavy. It does not take much fuel to get over the edge working. I had mine right on 1250 for miles at a time and had to keep feathering the throttle as it crept up. It heat soaked enough for the fan to go direct.
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Re: Little tweaks for power on a 93 250

Postby ahale2772 » Wed Jul 20, 2011 10:23 am

Yep I'm gona convince him to do a pyro at least, boost should not get any where dangerous with just a fuel pin, gov spring and fuel screw to the collar should it?
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Re: Little tweaks for power on a 93 250

Postby diesel freak01 » Wed Jul 20, 2011 10:36 am

no shouldnt be a worry. my truck with all stock components except the fuel turned up runs on the high side of 30 to 32 psi. and it only runs up to 1200 on the pyro on a very hard uphill pull. of course that may change with a tighter trans.
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