twin turbo propane small block v8
10-21-2013, 10:11 PM
#12
0.0 BAR
Join Date: Oct 2013
Posts: 7
hey folks just arrived here today after stumbling around lookin for info. turns out ive got just the setup 2wd-k5 is thinking about trying. its in a 89 dodge pickup shortbox. 360 , 2 turbos from Shelby daytonas 2 impco 425 mixers drawn through the turbos. 1 evaporator. no intercooler altho ive tried it with a stock cummins cooler and its a restriction. my guess is a cooler with a a 1000 cfm capacity would work. it was a bit of farting around with plumbing oil and coolant to and from the turbos but looks cool lol. ive been running this setup for a few years and works very vell low and midrange but as expected runs out of wind around 4000rpm. plans for a large single turbo are in the works now. I noticed u guys are from my neck of the woods here in salmon arm bc. gotta love the okanagen eh!
10-25-2013, 12:46 PM
#13
0.0 BAR
Join Date: Aug 2013
Posts: 2
boosted BBQ, I'm down in kelowna area,
I have a few questions for you? how much boost and what is your compression ratio? Was it tricky to tune your setup? I'm new to the propane side so haven't had to do much with the tuning. is your system draw or blow through?
Some pictures would be sweet too
I have a few questions for you? how much boost and what is your compression ratio? Was it tricky to tune your setup? I'm new to the propane side so haven't had to do much with the tuning. is your system draw or blow through?
Some pictures would be sweet too
Last edited by Jason_86K5; 10-25-2013 at 12:52 PM.
11-07-2013, 06:43 PM
#14
0.0 BAR
Join Date: Oct 2013
Posts: 7
Ok its a draw through. Much simpler install and the fuel is already a gas so u dont need to worry about pooling like liquid fuel does. I got some pics ill try to attach. Simple to tune lean out the mixture at idle cause ur pullin from 2 mixers. I disconnected the vac advance and pinned my distributor to limit mechanical advance to about 35 degrees total. Ive messed with the stock gates and played with more boost but any more than 10 psi hurts stuff. Ive melted a few small block dodges with 14 psi. Besides the little turbos r way beyond there efficient limits by then.
03-23-2014, 04:21 PM
#16
0.0 BAR
Join Date: Mar 2014
Posts: 1
i been working on the same thing off and on for a few years
the impco 450 is perfect in combination with the two model E convertors
the carb works out the box in blow through aplications , you do need to put a boost refference hose between the carb and both convertors thats all
i'm planning on putting the setup in a 1977 c10 pickup but using as mush stock of the shelf parts and as little welding as possible
lets start the exaust system from the motor :
stainles of the shelve tube headers for a chevy c10 (get quality ones with thick flanges)
stainles flange for those headers then straight stainless pipes up to the rear of the cab under the bed
one stainless U pipe cut non simetric (when turning the turbo's so the intaketurbine parts are facing out toward the frame while sitting side by side the angle to the exaust intake differs , one U should be enough to connect both turbo's to the straight pipes )
welding the flanges to the straight bit to connect to the headers then chuck both finished U bend parts in a vice and drill intoo the turn to fit the bungs for the wastegates then weld ontoo the straight pipe pointing up toward the bed and the wastegatebungs pointing straight out the turn in line with the straight pipes
you need two flanges to mount the turbo's ontoo welded to the ends of the bends
the exaust can be made the hard way over the rear axle or realy simple with just a bend and like a truckstack straight up through the bed (requires minimum welding )
the wastegates usually have the exaust on an 45 degree angle so mount those pointing up and connect intoo those stacks of you want them muffled or down of you dont
intake back from the turbos to the intake :
some big round semi truck (paper cardridge) filter housing with two hookup points for the two turbo's mounted behind the cab in the bed with sillicone hose to the turbo intakes
from the turbine part to the motor basicly straight aluminium piping mounted to the doorsills under the floor going up between the cab and the frontwheels , then some silicone bends (semi truck radiatorhose?) into a cheap aluminium dual intake carbhead on top of the carb
you need to modify the carbhead dril a hole in the side and weld a bung for the blowoff valve
oiling :
2 possebillities there :
a stand alone system with a oiltank in the bed dropfeeding intoo the two turbo's and a scavengepump pulling the oil out and back intoo the tank
pulling oil from the motor and route it to the turbos and feed the return oil with a scavengepump intoo one of the oilbreathersholes on the valvecover
watercooled turbo's
....... extra (transmission?) radiator under the car and an electric pump , dont think they will need a lot of cooling other then prevent the oil from baking off when the car is turned off with the turbos red hot
the longer distance from the engine and having the turbos in the open air actually should cool the turbos and the oil a little
you can slip some mufflers ontoo the stacks and take them off for racing other than that it should be pretty straight forward
use the thickest feedline available from the propane tank to the converters
the long aluminium pipe should cool the charge as good as a intercooler would if not you could mount water to air intercoolers under the seathumbs of the cab
they say that the turbolag will grow when using as long an exaust to the turbos , there commersial systems availavle for the corvette that use even longer distances , you might need to go down on the exaustturbine side and maibe wrap the whole exaust in asbestos tape but other than that it should work
the parts that need welding can be taken away from the truck and intoo a weldingshop wish would safe a lot of cash compared to having the welder come to youre pace or needing to have the truck on a lift to weld the parts
when using oiling option 2 no drilling needed in the oilpan you do need some sort of restrictor to lower the oilpressure intoo the turbos or the seals will bust
the impco 450 is perfect in combination with the two model E convertors
the carb works out the box in blow through aplications , you do need to put a boost refference hose between the carb and both convertors thats all
i'm planning on putting the setup in a 1977 c10 pickup but using as mush stock of the shelf parts and as little welding as possible
lets start the exaust system from the motor :
stainles of the shelve tube headers for a chevy c10 (get quality ones with thick flanges)
stainles flange for those headers then straight stainless pipes up to the rear of the cab under the bed
one stainless U pipe cut non simetric (when turning the turbo's so the intaketurbine parts are facing out toward the frame while sitting side by side the angle to the exaust intake differs , one U should be enough to connect both turbo's to the straight pipes )
welding the flanges to the straight bit to connect to the headers then chuck both finished U bend parts in a vice and drill intoo the turn to fit the bungs for the wastegates then weld ontoo the straight pipe pointing up toward the bed and the wastegatebungs pointing straight out the turn in line with the straight pipes
you need two flanges to mount the turbo's ontoo welded to the ends of the bends
the exaust can be made the hard way over the rear axle or realy simple with just a bend and like a truckstack straight up through the bed (requires minimum welding )
the wastegates usually have the exaust on an 45 degree angle so mount those pointing up and connect intoo those stacks of you want them muffled or down of you dont
intake back from the turbos to the intake :
some big round semi truck (paper cardridge) filter housing with two hookup points for the two turbo's mounted behind the cab in the bed with sillicone hose to the turbo intakes
from the turbine part to the motor basicly straight aluminium piping mounted to the doorsills under the floor going up between the cab and the frontwheels , then some silicone bends (semi truck radiatorhose?) into a cheap aluminium dual intake carbhead on top of the carb
you need to modify the carbhead dril a hole in the side and weld a bung for the blowoff valve
oiling :
2 possebillities there :
a stand alone system with a oiltank in the bed dropfeeding intoo the two turbo's and a scavengepump pulling the oil out and back intoo the tank
pulling oil from the motor and route it to the turbos and feed the return oil with a scavengepump intoo one of the oilbreathersholes on the valvecover
watercooled turbo's
....... extra (transmission?) radiator under the car and an electric pump , dont think they will need a lot of cooling other then prevent the oil from baking off when the car is turned off with the turbos red hot
the longer distance from the engine and having the turbos in the open air actually should cool the turbos and the oil a little
you can slip some mufflers ontoo the stacks and take them off for racing other than that it should be pretty straight forward
use the thickest feedline available from the propane tank to the converters
the long aluminium pipe should cool the charge as good as a intercooler would if not you could mount water to air intercoolers under the seathumbs of the cab
they say that the turbolag will grow when using as long an exaust to the turbos , there commersial systems availavle for the corvette that use even longer distances , you might need to go down on the exaustturbine side and maibe wrap the whole exaust in asbestos tape but other than that it should work
the parts that need welding can be taken away from the truck and intoo a weldingshop wish would safe a lot of cash compared to having the welder come to youre pace or needing to have the truck on a lift to weld the parts
when using oiling option 2 no drilling needed in the oilpan you do need some sort of restrictor to lower the oilpressure intoo the turbos or the seals will bust
Last edited by watahyahknow; 03-23-2014 at 04:49 PM.
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