Huffa

Putting together a 5.3 twin turbo in race boat, will be running at 5000-6000rpm for extended periods. What injectors are good value for my application? Sort of replicating a build where they used 160 p/hr injectors, whats available in that range?

SethU

Assuming you're going to run gasoline, I think the Siemens Deka 80lb/hr are pretty standard fare on budget conscious builds.

Doing a TT 5.3 boat build myself, in an 18' Hallett flat bottom V-drive. Not a race boat though.

Stuff's just mach'd up at the moment... Still wiring in the MicroSquirt.








Little spud sticking through the timing cover is for a cam driven fuel pump.



Tell me more about your boat.

Huffa

Thanks for the reply, that's looking good, how long to blast off?. Are you just staying with the truck inlet manifold? Would you have a link to some injectors that I could buy at all? Probably easiest to read this thread about my boat
https://ls1tech.com/forums/forced-in...at-engine.html

SethU

I bought my injectors from efisource when I ordered my ECU, however they can be found for less on ebay.

http://www.efisource.com/shop/siemen...ctor-set-of-8/

Yes, I'm going to run the truck intake. I'm mounting all the electronics on top of it. Microsquirt, knocksense (knock controller), wideband controller, boost control solenoid, wireless bluetooth transceiver, fuses, and relays. Then put a beauty cover the top to hide and protect it all. Real simple if/when the engine needs to come out.

Reading your other thread now... Maybe search ebay for Seimans Deka 80 over there in NZ.

nobreaks254

iTrader: (50)

Little spud sticking through the timing cover is for a cam driven fuel pump.



Off topic but could you give more info on the cam driven fuel pump set up?

SethU

Not sure what you wanna know. The pump is a Chinese deal, similar to/knock off of an Aeromotive.
http://www.ebay.com/itm/OBX-Hex-Driv...lROR~F&vxp=mtr

I couldn't find a drive spud (bolts to the cam sprocket) with the proper register and bolt pattern to fit an LS style sprocket so I had a friend turn down the register of a drive spud intended for a BBC/SBC on his lathe and create the appropriate smaller bolt hole pattern in his mill to work with my sprocket/cam.

If I could go back in time, I'd just go with an electric pump. But, I was all hopped up on the idea of not having the noise of an electric pump buzzing away.

Huffa

Would these injectors be better than the Siemens Deka 80lb ones? Will they supply enough fuel for my needs?


http://www.ebay.com/itm/161347287540?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Huffa

Or would these be better? Anyone know much about these?
http://www.gumtree.com.au/s-ad/croyd...ls3/1107241525

SethU

Either of those will support more HP than the 80's. The 80's should support a bit over 900 crank HP at 3 bar fuel pressure and 80% duty cycle. Over 1000 at 4 bar fuel pressure. (Gasoline)

One thing I forgot to mention is when you use the SD80's on a stock truck intake, the fuel rail needs to be spaced up a bit. The injectors are taller than stock.

https://sites.google.com/site/sloppy...torspacerhowto

Also, make sure that you don't get low impedance injectors unless your ecu is able to support them.

Huffa

Thanks, so the genuine bosch injectors would be a better bet wouldn't they?

SethU

They are a better choice. At $150 more, I'd consider them. Here in the states they're twice the cost of the SD80's.

Huffa

Would there be any advantage in changing the truck intake over to a LS1 intake? Would it make fitting bigger injectors easier? Will I need to install bigger fuel rails for the Bosch injectors to ensure plenty of flow?

SethU

I don't know about injector fitment on the car manifolds. There are a bunch of performance tests on all the various manifolds and I don't remember specifics, but what sticks in my mind was that the truck manifold wasn't all that bad and the LS1 wasn't all that good. I think the LS6 manifold had some good performance. But again, just off of memory of someone else's report. Do a little research though. Don't take my word on it. I'll see if I can turn up some links for you.

Huffa

Ok, so I will get the bosch injectors. What else do I need to fit them to the truck manifold? Where do I get spacers? What aftermarket fuel rails fit? LS1 fuel rails the same?

SethU

Here in the states, "spacers" can be found at nearly any hardware/home improvement store. They're just little nylon deals. However, when I went shopping for them I even saw some chrome steel ones that I considered.

Here's the "How To" link again.
https://sites.google.com/site/sloppy...torspacerhowto

Might also look into this link on mounting an IAT sensor in the stock truck intake too. I did it a little different though. Instead of drilling out the intake, I used a sanding drum on a Dremel and gradually thinned and tapered the plastic body of the sensor itself until it had a nice snug fit. Gooped it up with a little silicon, being careful not to get any on the tip, and tapped it in the hole good and snug. Worked like a charm for me.
https://sites.google.com/site/sloppy...n-truck-intake

SethU

Also, aftermarket fuel rails to fit the truck intake are difficult to impossible to find. Odd. I ordered LS1 rails thinking they would bolt right up... Nope. The injectors fit no problem, but the mounting bolt hole no such luck. I have found a few reports of guys that have successfully adapted them. However, in hind site, I think I should have just stuck with the factory fuel rail for simplicity. The guys here seem to be making a ton of power on the stocker.

Huffa

Cheers, you think the stock rail will supply sufficient flow for my continual load and thrashing up the river? So next bet would be to get a LS6 manifold, aftermarket rails bolt up to them?

SethU

https://ls1tech.com/forums/forced-in...il-max-hp.html

Seems as though it's not uncharted territory.

Huffa

Interesting. Still not convinced they will be up to it for the boat. I have already melted a piston in my blown SBC because of insufficient flow, that was running a 110GPH pump. I am doubtful if that would have happened if it was in a car.

Huffa

Just seen these, would they be ideal or no good being a short injector?
http://www.ebay.com/itm/262361455400?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT