turbo fuel pump will it work?

[crack]

ok im putting a sc14 supercharger on my 2.8 diesel hilux. the supercharger has a magnetic clutch plate. so i was thinking if i ran a fuel pump made for a turbo i could have the charger wired up to a switch so i can choose when i wanna use it istead of having it running constantly. would this work?


cheers jack

ps. mods please move to toyota section if need be

[HotFourOk]

If you use a fuel pump with a boost compensator (from a turbo), you may be able to run a line from the inlet manifold to the fuel pump, which will put more fuel in for more boost pressure going into the motor.

You can run a switch into your cabin to turn it on/off when needed.

[ozy1]

being a 2.8 hilux, i a, guessing your injector pump does not have a boost compenator, adding a fuel pump before the current injector pump will only help the feed to your injector pump,

id say you will need your injector pump adjusted to suit, but once adjusted to get your EGT's right, and you turn the supercharger off, your motor will be over fuellin and this is not a good idea,

that the way i see it, please correct me if im wrong,

[crack]

ozy1 yeh thats wat i was thinking but someone told me that a the turbo fuel pump fronm a turbo would work. would i be better off putting a different injector pump on?

cheers jack

[ozy1]

do you mean that if you swapped your current injector pump out for one from a turbo model? not sure about hilux's but if the turbo model has a boos compensator this may well work, as DUMBDUNCE he is the toyota GURU,

[dumbdunce]

you can modify the pump off a 2.4 turbo to work ok with a 2.8 with forced induction, and what you wanting to do will work, but the obvious question is why would you want a switchable aupercharger in the first place? it won't make a heap of extra power with the supercharger and when you switch it off you will have extra drag from belts and pulleys and a heap of drag caused by the engine pulling the air through the stationary/unloaded supercharger. I would set up the fuelling for the boost you are running (use your EGT as ozy suggested), and use the magnetic clutch just to disengage the SC for starting.


Some things to consider with SCing a 2.8: the bottom end of those motors is borderline, and superchargers take a fair bit of power from the crankshaft to run. you will ned to keep the boost low or you might spin big end bearings, and/or spin the balancer/pulleys and destroy the keyways in the front of the crank. Superchargers also heap up the inlet air as much (or more!) than a turbo, and without intercooling, can send your inlet air temps sky high even with minimual boost. an inlet air temp gauge is also a good idea if you want your motor to live. If you haven't alrelady, you will need to address your exhaust - and it is far trickier with a supercharger than a turbo. A supercharged engine makes more exhaust, proportional to boost, and also makes MORE noise. you need to keep the noise level down, which means a better silencing exhaust, but you also need it to flow more gas, which means bigger pipe, mandrel bends, and triple flow/turbo mufflers, and probably more of them. A turbo is naturally noise reducing because the turbine is a big exhaust restriction, but superchargers have no such advantage. The bottom line is, although a supercharger can be cheap to buy, and if you're handy with booty fab, can be easy to mount up, it's never going to make as much power for the same dollars with the same reliability as a turbo. Of course superchargers have the advantage of making boost right off idle, which a turbo will never have, but if you need low RPM torque, you need to start with a bigger engine platform than 2.8 litres. I'm not saying don't do it, just making sure you're going in with eyes wide open.

superchargers sound

[crack]

hmm this is sounding harder then i first thought. well i have a 2" exhust with extractors...im guessing this isnt going to be big enough? the main reason i wanted it on a switch was for driving around town etc i could turn it off. im not to keen on ruining my motor as im about to start an apprenticeship and wont be able to afford a rebuild or new engine. as for the boost i was thinking 5-6psi?

how much do u think i would be looking at for a good second hand turbo and setup? this may be the go if its safer for the engine?

cheers jack

[-Scott-]

If your existing motor is in good condition, how much can you sell if for? You may be better off selling your existing motor, add your supercharging budget and buy a turbo motor (with a warranty...)

[crack]

hmm might be an idea. its got 220,000km on it roughly could be less. no idea how much i could sell it for...prolly not much. wat would a turbo motor be worth?

[tweak'e]

selling off your motor and getting a turbo one? thats proberly more exspencive than fitting a turbo onto the existing motor. fitting the 3 litre turbo motors is not a straight forward job and the price difference between the whole utes is quite a bit.

its an interesting project, one i've toyed with myself. the point about the front pulleys is something i havn't concidered. i'm not sure if the stock harmonic balancer will handle such a big load on it.

fitting a surf turbo on while crude will give more power and better economy (i guess the supercharger won't improve economy). add the surf fuel pump and you can really crank it up.

[crack]

yes a turbo is definatly sounding the way to go. may have to hunt around for a good second hand turbo. how much do u think one would go for? and how hard would this be to set up your self?

cheers jack