Originally Posted By: rooflessVW
Originally Posted By: A_Harman
Originally Posted By: rooflessVW
I'm actually looking at a particular '84 Crew Cab with the 5.9 Cummins. Hopefully it's still for sale in April-May.
Exhaust, injectors, fuel plate, and bigger turbo will be almost immediate. 400hp and 900ft-lbs would be the goal.
Don't get greedy spec'ing the turbo. Most of those aftermarket tuner places will sell you something that doesn't light until 2500 rpm, and will produce stupid amounts of acceleration smoke. You need something that is lit by 1600 rpm if you want a truck that is usable on the street.
Thats a fair point. I've read that 300hp/600tq is achievable with minimal work - that may be the way to go for something that's going to get driven.
The plan would be to drive it while I'm home, and let's my pops drive it while I'm away. His '86 C10 is giving him more trouble than he wants to deal with.
My justification to the wife is, "we're homeowners! What if we need to pick up mulch???"
My truck runs up to 435 HP / 945 ft*lbs at the rear wheels with a maximum boost of 40 psi. This was achieved using an Industrial Injection Phat Shaft 62 turbo with the 14 cm^2 turbine housing. At the time I specified this turbo, I was chasing the diesel truck record at the Ohio Mile, and wanted to make sure I made top-end power. Below 2000 rpm, this turbo was very lazy, and the engine would not produce peak torque until 2300 rpm. I lived with this turbo on the street for 3 years, but found that I was driving it very gingerly to keep from rolling coal every time I tipped into the accelerator. The sales guy that sold it to me said I could tow with it, and I could, but I had to watch the exhaust temperature if I was towing at 1750 rpm and had to climb a hill. If the exhaust temp hit 1200F, I would downshift so the engine could run over 2200 rpm, where the turbo was happy.
The factory turbo on my truck produced its maximum boost of 19 psi by 1600 rpm, so there was no concern with transient smoke in daily street driving. As I added fueling, I messed around with the wastegate and put a boost fooler on it to pump the boost up to 27 psi. This was about the limit that could be gotten with the factory turbo, as the compressor didn't have the flow capacity to make the power I required at 3200 rpm. That is how I got into buying the aftermarket turbo.
Last summer I got tired of babying the accelerator on my truck and bought a 12 cm^2 turbine housing to retrofit onto the Phat Shaft 62 turbo, hoping to bring back the low-speed boost of the factory turbo. It didn't quite get there, but transient response below 2000 rpm is much improved, and I can tow at 1750 rpm, keeping the exhaust temp at 1200F while climbing hills at full throttle.