Hey i just joined this sight in hopes of finding some other folks that have put turbos on some zuki/trackers too. I have a Geo Tracker with a Holset turbocharger off a 5.9 cummins (rather large, LOTS of lag), no intercooler, with alcohol injection, i HAVE hit 25psi of boost, but don't like to (detonates BC lack of fuel), 10 to 15 is hit pretty regularly climbing a big hill or sunk in the mud and my alcohol injection keeps it running strong in that range. The problem is the fuel. its hard to regulate accurately beyond about 12psi with my single stage of alcohol injection via windshield washer pump. I'm wanting accurate regulation up to 25 or 30 psi because i have plans to ring the block and the possibility of a second staged charger BC i have the turbos laying around.

I would do away with stock injection all together in favor of a completely self regulated system (new MAF sensor and a single throttle body injector) designed for something much larger. My thoughts was a standalone fuel injection convertion kit from Holley for a small block V-8 or something. It would be ideal But very pricey. any thoughts on how i could simply add another injector without a new computer or something simple?

Two cheap ways that I've "seen" used to dump more fuel in:

- Higher pressure fuel regulator - like an aftermarket rising rate regulator.  This will only increase fuel flow marginally.
- extra injector(s) connected to a Hobbs switch (which switches on at a particular psi).  So when the manifold reaches X psi the
  Hobbs switch flips and the extra injector(s) dump fuel in.

These, of course, are not the best ways to get more fuel, but are definitely cheaper ways.

 I think one of the best would be a custom intake manifold for multi port FI running a stand alone FI system like Megasquirt.

Do you have the alcohol injection running through a specific jet, or injector?

actually my original fuel pump bit the dust so i put an inline fuel pump on it that i robber off an f350 powerstroke on it, which is higher pressure i think. And the "injector" i have now is my windsheild washer tank with alcohol in it. i ran a single hose right from the tank to the intake. i watch my "boost gauge" (low pressure tire gauge tapped into the manifold) and at about 7 psi i hit it the windsheild washer fluid lever. Works fine for moderate pressure. sometimes it tends to fall on its face wile climbing a hill cause i forget to hit the lever   

 hobbs switches easy to find? i think another windsheild washer pump with alcohol might do the trick.
I'll look into megasquirt too. id rather keep all mods under $500 though.

could you i imagine how trick a multi point mega squirt would be? god, perfect amount of fuel and good too ridiculous ammounts of horsepower   twin charger, 40psi, ringed heads, alcohol multi point injection  . if you put enough boost to it you dont need any more mods. high flow cam and intake would be redundant at that kind of boost pressure. have to get a logging chain to keep the head strapped on. pipe dreams...

have to get a logging chain to keep the head strapped on. pipe dreams...

Don't worry about the head it will be fine, its the rods that will be flying through the air 

If you are running stock pistons, I would stay away from boost pressures
over 6 PSI, and with the fuel system you have on there now, you will melt
down a piston long before the rods go south

Wild

yea i usually only hit 10 on a decent climb. the alcohol injection, although not very precicely regulated, seems to keep it going alright. So i figure, Eh alcohol burns pretty cool so itl'll be alright lol. i gotta show off a bit on the road though, ya know? that boost gauge just keeps climbing higher the longer you hammer down lol 25psi is hit in 3rd gear |removethispart|@ 5k rpm when you build it from 2k going down the road. thats about the only chance you have of building boost long enough to hit that kind of pressure

Don't forget to post photo's of your grenaded motor next week!

Don't forget to post photo's of your grenaded motor next week!

I second that!    Amazed the bottom end lasted this long!

Correct me if im wrong, but arent the pistons likely to be fordged in stock form because of the high rev range (7k red line)? theyre obviously tough engines just judging on what iv put mine through

Pretty sure the pistons are not forged, and I've done quite a bit of research on turbocharging these engines. Your also likely to have exhaust valve issues from the tremendous heat gererated. Do you use a pyrometer? I'm curious to know what kind of egt's you get at those boost pressures. Also, how about some photos of your setup?

yea no clue on the egt. the charger is so big with so much lag it doesnt run with 12psi+ for more than ten seconds |removethispart||removethispart||removethispart|@ very most. might be the only thing thats saving it lol doesnt even run with 7psi+ unless you have it atleast half throttle. heres a sideways pic of the early set up without the air filter and alc. injection.

I machined a plate to flip the exhause manifold upside down; cut the intake manifold at a round section and used about 6 heavy duty hose clamps to attach the assorted lengths of radiator hose i needed to bridge the gap between the output of the charger and the intake of the engine. Pressurized Oil line was tapped into the oil pressure sensor and return was ran into the breather of the valve cover

heres one of a twin charger set up i made for shits and giggles. the hoses arent attached to the outter charger as you can see. didnt work well either. when i managed  to run the hoses it didnt make any more power than the single charger i have mounted up in this pic(you can also see my injection hose in the intake and the red hose for the pressure gauge). That charger is a banks with a 100 exhaust housing and it maxed out at 5 psi. the yellow is a holset with a 130 exhaust housing (i have no clue y it works so well) which iv had build 25psi

Don't have to worry about packaging issues without a hood! I guess it lets the hot air under there out well too. How about some more detailed pics of your manifold set up?

exhaust or intake manifold? it'll be thanksgiving before i can take more pics, im away from home at college right now.

Haha i was talking to someone who used to race 4x4s back in the day, like "gravelrama" style uphill drags and stuff. I told them about my tracker and the stuff iv done to it. He chuckles and says, whats the point of doing that to that little engine just to trail ride?
" I dont really know. Cause i can i guess."