looking for power estimates

A boost leak will not supply the afc with the needed boost it was tuned with.

Make sense ? I worked on a 175 pump truck that was doing the same thing- adequate fuel pressure, boost would only hit 30 or so psi with 4k springs and no plate with the afc all the loose, the egts would slowly climb to 1400 - truck would not even smoke unit I pulled the afc foot out. I wasnt trying to make it smoke I just couldn't figure out why adjustments were not changing much. Turned out the diaphram for the wastgate had a hole in it. The boost line that supplied the wastegate was sharing boost for the afc from a t in the line so the boost that made the afc work was leaking out of the hole in the wastgate plunger.
 
Do you have a fuel pressure gauge ? Your lift pump is probably not keeping up. I threw a cheap 70$ pro comp 140gph on my truck. Fuel pressure stays between 45-50psi at wot
 
SCHMITTY said:
Do you have a fuel pressure gauge ? Your lift pump is probably not keeping up. I threw a cheap 70$ pro comp 140gph on my truck. Fuel pressure stays between 45-50psi at wot
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I don't have a fuel pressure gauge, but I know I need one.

Thanks everybody for the info so far. ?
 
stubz616 said:
I would venture to guess high 400s for power and a mid 13 in the 1/4. I had a very similar setup previously in my 95. (64/74-14, 5x18s, 4K GSK, 024 DVs, and a cam and valve springs) made 518/907 in 3rd gear on a Dyno (never tried 4th for some reason) and ran 13.7 @107 in the 1/4 running in 2wd


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Watched a truck with very similar setup do 493 last spring on compounds.

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I finally got the truck back with a new lift pump. The original factory lift pump gave up on me. I also put a 366/480 set of compounds on it. Took it to the track tonight and it ran 12.017 at 114.88 on the only good pass I got in. I had a 1.847 60 foot time. I need to adjust the AFC because I think it was low on fuel. It really cleaned up and didn't smoke much at all. Anyway, I was pretty happy with that result considering I just got it back running and it needs some tuning. Not sure what it weighs but it's stock other than the motor mods, 1995 reg cab long bed 4x4 47rh.


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I'm pretty happy where the truck is right now, but I think it has more in it with just some tuning. It really clears up to just a haze at full throttle and the AFC is not at max fuel. I think I could go up on timing some too. The rotating assembly is stock though including the narrow-bowl stock pistons. It also has a little over 232k miles on the stock short block, so I may just leave it like it is for now. I don't want to push it any more and break it. Don't have the money to fix it right now if I break it. I could definitely make a faster pass just as it sits though by leaving harder and improving my 60 ft time. I left at about 17-18 pounds of boost and it actually bogged a little. I think it would stand leaving at 20-25 pounds.


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SCHMITTY said:
nice time. I hope to be running similar times next season
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Thank you. I'm planning on returning to the track soon. I'm going to do a little weight reduction, nothing big, may remove the rear bumper and passenger seat and anything else easy I can think of. Also going to try airing down my tires and leaving at higher boost to improve my sixty.


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Good pass! I had to up my boost to 20psi on the launch with twins vs 15psi for a single. The small turbo doesn't react as quick. With a 60ft in the 1.70's you should be into the 11's by quite a bit ;)
 
JQmile said:
Good pass! I had to up my boost to 20psi on the launch with twins vs 15psi for a single. The small turbo doesn't react as quick. With a 60ft in the 1.70's you should be into the 11's by quite a bit ;)
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Thanks man! Definitely hoping to get into the 11s my next trip to the track. I also have a kind of small air filter on the setup. I'm going to remove the filter at the track and replace it with a wire mesh screen. Not sure the filter is holding it back any but it is a pretty small cone shaped filter.


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