Hello all. I've been thinking about a 300 build for a number of years, and just recently came into a 1978 f-250 4x4 supercab with Dana 60s front and rear. Truck is currently a mild 429, C6, with an NP205. Gears are 4.10s, rolling on 35s.
Donor is a 300, T18, with an NP 208 out of an ?1982 Bronco? Will most likely keep 205 in the truck, better ratio (1.96) and sturdier. Will be using the T18 for sure.
I've decided on an intercooled, blow through set up. Picked up an SA design book on Turbos, and have started working up some numbers.
Target: 8lbs boost, 10lbs max. wastegated for sure
Daily driveability, occasional towing/hauling. NO EFI, ECM, or the like to be installed. I will run guages, but will be sticking with analog wherever possible. Will most likely dyno for fine tuning.
I have a turbo that may or may not work. It's a T3 housing, garrett, off a ?VG30DET? (Nissan 300ZX) in need of a rebuild. I plan on running a larger inducer diameter, smaller exducer diameter, to keep the power band down lower; like in a diesel. I haven't crunched the numbers yet on specific diameters/trim.
Based on 8-10lbs, the math suggests 1500rpm to 4500rpm is a safe bet, though the efficiency could be a little better, but I am on a bit of a budget.
I have a machinist who's on board with a rebuild. Motor will be opened up, though the focus is on longevity. Still need to make a complete plan with him, and strip the motor down before purchasing parts.
QUESTIONS:
#1) Am I correct in wanting to use a smaller T3 for driveability/longevity, as opposed to what looks like a T4 most of the other posters on this forum are running?
#1b) If needing a different turbo housing, what do you think the best option is and why?
#2) At 8-10lbs boost, would stock grind cam w/ 1.7 rockers put out better low end torque, or bump up to a 252 cam? Goal is 400 ft lbs at crank (and hopefully? 15-20mpg). (it seems rediculous seeing it in writing, lol)
Thanks for whatever you have to offer, and I hope to be able give back what I hope to get out of the forum.
Donor is a 300, T18, with an NP 208 out of an ?1982 Bronco? Will most likely keep 205 in the truck, better ratio (1.96) and sturdier. Will be using the T18 for sure.
I've decided on an intercooled, blow through set up. Picked up an SA design book on Turbos, and have started working up some numbers.
Target: 8lbs boost, 10lbs max. wastegated for sure
Daily driveability, occasional towing/hauling. NO EFI, ECM, or the like to be installed. I will run guages, but will be sticking with analog wherever possible. Will most likely dyno for fine tuning.
I have a turbo that may or may not work. It's a T3 housing, garrett, off a ?VG30DET? (Nissan 300ZX) in need of a rebuild. I plan on running a larger inducer diameter, smaller exducer diameter, to keep the power band down lower; like in a diesel. I haven't crunched the numbers yet on specific diameters/trim.
Based on 8-10lbs, the math suggests 1500rpm to 4500rpm is a safe bet, though the efficiency could be a little better, but I am on a bit of a budget.
I have a machinist who's on board with a rebuild. Motor will be opened up, though the focus is on longevity. Still need to make a complete plan with him, and strip the motor down before purchasing parts.
QUESTIONS:
#1) Am I correct in wanting to use a smaller T3 for driveability/longevity, as opposed to what looks like a T4 most of the other posters on this forum are running?
#1b) If needing a different turbo housing, what do you think the best option is and why?
#2) At 8-10lbs boost, would stock grind cam w/ 1.7 rockers put out better low end torque, or bump up to a 252 cam? Goal is 400 ft lbs at crank (and hopefully? 15-20mpg). (it seems rediculous seeing it in writing, lol)
Thanks for whatever you have to offer, and I hope to be able give back what I hope to get out of the forum.