Singles Outlaw member #9
Join Date: Sep 2007
Thanked 6 Times in 6 Posts
Boost is kind of your own personal preference. Usually people say a stock 6.9 with head bolts can handle a max of 12-15psi. I would stay on the low side of that, unless you had head studs, then 15 psi wouldnt be a problem.
And looking at another thread on another site, I would say 200hp for a turbo IDI is a little to much. Heres a quote from the thread, he was talking about how propane makes a difference power-wise.
"Here are my numbers on the dyno run this summer:
First pull, no LPG
HP 183.15 Torque 325.45
2nd and 3rd pull with LPG
HP 205.35 Torque 362.64
HP 205.51 Torque 361.55
So 22.96 increase in HP and 37.19 increase in Torque with the propane.
One of the guys figured that is 298.5HP at the crank with the LPG. not bad for a stock pump, just turned up, stock injectors, old style Banks turbo, and homeade LPG. Oh yea, little exhaust work also."
I think that 298.5hp at the crank is a bit excessive though, more like 250-260hp at the crank.
1985 Ford F-250 with a 6.9 IDI, Regular cab, 4x4, T-19 tranny, 3.54's non-limited slip.Things I've done:
New Dupont blazing fire red paint, new eagle alloys series 186 in 16x8" with BFG T/A KO 285/75/16 E tires, all new exterior chrome pieces like new bumpers new grille ect., ISSPRO tach on the A-pillar, ATS wastegated turbo, 4" exhaust, ISSPRO boost pyro water and oil temp gagues, pump maxed out, coming soon: stereo, spray in bedliner, other misc stuff. Wishlist: A Zf-5 speed or gear vendors overdrive, lockers, 2.5"-4" of lift with 315/75/16 tires, newer seat from a psd, all new gauges, Dana 60 front end, a 7.3 psd intercooler, propane, moose pump.