Reply to thread

Message: [QUOTE="kampy, post: 489543, member: 989"] I've run 170/stock nozzle and 170/30's on the same truck, same mods, both sets of injectors were run with a 9 blade SD compressor wheel and both the stock 1.15 housing and a 1.0 exhaust housing and have dyno'd all 4 configurations. All runs were on the same DJ dyno. The 30% nozzles consistently made 20 additional hp in my tow tune with no changes to the tuning. My numbers from the calculators are 368 rwhp by trap speed, 343 by ET, and 367 corrected on the DJ. I ran the 170/stock for about 15k and the 170/30 have been in for about 25k. FWIW, I've run Beans tuning on a SD, and on the OBS I've run swamps tunes and PHP tunes and they made good power but all smoked like a train. I run Matt's tunes now and I've had them for the last couple years and after a couple tweaks I now get a puff of gray smoke on tip in and then its clean. Of the three tuners I've used Matt has the best overall, well mannered, well rounded, low smoke, daily driver tunes hands down but that's just my opinion. Background and personal experience: I built the injectors with parts from Jim and the 30% nozzles are from swamps. My tow tune is also my daily driver tune, its the only tune I use and I had Matt pull fuel out of it on the low boost/low end range to keep it mostly smoke free. Don't know where you live altitude-wise but I'm at 5500 ft and go up from there, up as high as 11k ft in the Eisenhower tunnel in Colorado. I have a slide in 10ft camper and tow a jeep on a trailer, gross loaded is right at 17K. I can pull any grade around here and the truck never goes over 1150 and rarely kicks out of OD with the cruise set at 75 and several grades are 6-8% for several miles. I've had much better luck both from an empty drive-ability and loaded tow-ability stand point with the 1.0 exhaust housing. The response is excellent, even at these altitudes, noticeably better than the 1.15 housing. Hope that gives a little real world perspective. Bottom line is.... just pick a nozzle, there's really not that much difference for daily driving. Pick your tuner of choice, drive it a while, talk to your tuner about what bugs you and have them tweak it. After a couple times you'll have it the way you want it for what you need and desire. Hairy, as for the towing goes, you can easily tow with a 400 hp engine in a 400 hp tune but you don't need, and can't use all the power except for brief periods like pulling grades. It very unlikely you'll be using even 200 hp most of the time unless its short distances. That kind of power melts differentials in trucks our size. When I tow, it's usually about 450 miles to Colorado, 350 miles to Moab, or the 1300 mile trip to Illinois to see the grandkids. 85 305 – Bean can tell you anything you want to believe, and yes, a stock turbo will live at 400 hp non intercooled...on a dyno for a 20 second run. Looks good on a dyno sheet but you're simply not going to put down 400 non intercooled hp on a stock turbo in a towing situation without melting the engine, period. But of course, you're welcome to try. [/QUOTE]