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What's up with this ellusive adapter?
Jeremy
What's up with this ellusive adapter?
Jeremy
2F turbo (22 Viewers)
- Thread starter Mace
- Start date
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carb 2f? you'd be silly not to propane it.
propane and turbo is like.... lockers and longfields
Mace, why not a blow through propane setup? i've yet to hear a con for them, and you don't have metres of intake piping primed with propaine waiting to backfire?
- Thread starter
- #105
The problem is enrichening the mixture during boost. It is very easy to go lean with large amounts of boost.
Going to a blow through set up for propane there is a port on the mixer that you run a vacuum hose to the vaporizer. Forget the technical term for it but under boost it sends a "signal" to the vaporizer which opens the diaphragm up completely to allow maximum amount of propane flow into the mixer.
Going to a draw through setup for propane, tricks the mixer into still thinking it is on the intake. Which basically allows for a bolt and go type set up instead of the blow through design which does require more tuning.
The picture below shows where the "signal" vacuum hose attaches to the vaporizer under boost.
Going to a draw through setup for propane, tricks the mixer into still thinking it is on the intake. Which basically allows for a bolt and go type set up instead of the blow through design which does require more tuning.
The picture below shows where the "signal" vacuum hose attaches to the vaporizer under boost.
- Thread starter
- #107
Hooking it up that way does work, but you are only estimating the amount of extra fuel you need.
If you look carefully at the vaporizer where the small hose attatches there is a black square piece of plastic. That part has a small hole in it.. That allows a certain amount of Vac to bleed through. So you can essentially modify the amount of "extra" pane the motor is getting under boost.
It's also important to make sure that you have the correct Vac source identified on your mixer (that one is a 425). There are multiple sources, and not all of them have the same signal.
Lastly, that balance tube would replace the ability of going to a closed loop system. The closed loop system relies on modulating the balance tube to make the most efficient use of the fuel.
You also pretty much need a Blow off Valve.. Pressures can get pretty high when you chop the throttle and the turbo is still spinning..
If you look carefully at the vaporizer where the small hose attatches there is a black square piece of plastic. That part has a small hole in it.. That allows a certain amount of Vac to bleed through. So you can essentially modify the amount of "extra" pane the motor is getting under boost.
It's also important to make sure that you have the correct Vac source identified on your mixer (that one is a 425). There are multiple sources, and not all of them have the same signal.
Lastly, that balance tube would replace the ability of going to a closed loop system. The closed loop system relies on modulating the balance tube to make the most efficient use of the fuel.
You also pretty much need a Blow off Valve.. Pressures can get pretty high when you chop the throttle and the turbo is still spinning..
Its interesting that diesel engines do not use a blow off valve. I looked at the Holset turbos and they use a huge amount of boost. The minimum is around 25 psi from what I've gathered.
I found a forum called Turbo Mustangs and there are a small number of guys that are running dual 425 mixers on their drag race cars. All of them using the blow through design using the "signal" hose for the vaporizer and you do have to use one for the vacuum lock off valve (if running one).
I found a forum called Turbo Mustangs and there are a small number of guys that are running dual 425 mixers on their drag race cars. All of them using the blow through design using the "signal" hose for the vaporizer and you do have to use one for the vacuum lock off valve (if running one).
matt.mcinnes
2F-ETI
Diesela dont have a throttle body or a butterly to close though so less need for a blow off valve.
- Thread starter
- #110
Yep, the "gas" pedal on a diesel just controlls the amount of fuel spitting into the cylinder..
That's why compression braking does not work so well with a diesel..
the balance tube/boost compensato does a good job here tho. most the LPG guys in AUS run blow through systems. draw through is almost unheard of.
they don't???? my H series troopy sure as hell had one... when i snapped the throttle cable i Duct taped the butterfly half open to get it home. engine braking was 3 times better than a petrol. it had to be because the stock drums weren't flasj
- Thread starter
- #112
Funny, the turbo system on my 2F cam from OZ...
they don't???? my H series troopy sure as hell had one... when i snapped the throttle cable i Duct taped the butterfly half open to get it home. engine braking was 3 times better than a petrol. it had to be because the stock drums weren't flasj
Pic please...
i'll see if i had a pic. i dumped that motor over 3 years ago! might be able to find the FSM and scan a pic.
Yeah, not too many (till recently) turbo'd 2f's, so only have Flaminbandits 2f to mention there, i was talking more in general terms (ford I6's and rotories mainly, where guys have been doing it for years).
Another difference between US and AUS turbo-ing scene is that hardly anyone over here turbo's carb'd petrol cars, so maybe you guys do more draw through systems, because blow through didn't work as well with petrol carb's?
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- Thread starter
- #114
Blow through works just fine with gasoline. There are benefits and issues with each setup.
Personally I like draw through just because the carb has no idea what motor it is on. It just knows how much air is needed.
Personally I like draw through just because the carb has no idea what motor it is on. It just knows how much air is needed.
yep blow through lpg rocks very happy with my setup im upgrading the turbo very soon and the intercooler mainly so its off boost a bit more often at the moment im running just on boost(1-2psi) at 100kays so the temp is creeping and not te mention the stupid fuel uneconemy
boost in lowrange is silly tho maby i just need lockers to assist with getting the power to the ground LOL
boost in lowrange is silly tho maby i just need lockers to assist with getting the power to the ground LOL
yep all gears both ranges stock gears and 35" tyres
low 1st is just crazy without a very very light foot
im using a turbo from a r32/33 skyline so really its too small for a 2f but its really quick to spool up
i beleive there only a 2.5l engine
low 1st is just crazy without a very very light foot
im using a turbo from a r32/33 skyline so really its too small for a 2f but its really quick to spool up
i beleive there only a 2.5l engine
i only ran 20 for a bit while being a dumbass as its a 100% stock motor and well id rather not destroy it completly
unsure at what rpm it was
i run 10psi at the moment and its running great ive wound the boost controller up to 15 a few times just for laughs and it seems to handle it ok
unsure at what rpm it was
i run 10psi at the moment and its running great ive wound the boost controller up to 15 a few times just for laughs and it seems to handle it ok
- Thread starter
- #120
so you have no idea what RPM you hit 20 psi at?
If it was anywhere in the 2-3K range it is not an undersized turbo..
go hit 15psi again and see what rpm it was at
If it was anywhere in the 2-3K range it is not an undersized turbo..
go hit 15psi again and see what rpm it was at
