42lb or 36lb Injectors?

[G.I.Ceo]

So here's the deal. I have bought the turbo headers from another member and I have decided to start piecing together a turbo system but I am not going to cheapen on anything. I am not in a hurry to get this done so this will not be something that's going to be done right away. I would like to try and get it up and running sometime in the summer but I never know how money will go. Also I am thinking of swapping to a 3500 while doing this build.

What I wanted to know should I use 36lb or 42lb fuel injectors? I almost bought a set of 42lb ones today but was not sure if they would work or be worth it. I have heard a lot of people say that 36lb injectors are enough. Also are the 42lb Lucas injectors the ones that are on the 01 SS Camaros?

Below is a decent picture of the headers and I will say they are a lot better in person then they are in the pictures and for what I paid for them I got one hell of a deal. I know that the GA you will say is not worth the time and effort but to me it is. I am not trying to out run people. All I want is something very few people have and know that it was all done by me.

[HOYS]

Oh god you bought those?

[zukiracer19]

before you even start, check and see if that rear flange is warped for crossover and header. because that will be the biggest pain in the ass if you put it together and you blow out a copper gasket... they aren't cheap... and please, please use copper not that cardboard crap; or aluminum. They will blow out the first time you boost. (from experience) I went through quite a few coppers when I was hitting 15 psi but other then that they hold up pretty good.

I'd go with 36 if you're not going to be going all out. That should be plenty; but if the price is right take the 42s.

[G.I.Ceo]

Originally Posted by HOYS

Oh god you bought those?

Why do you say that? Trust me they are not bad and I have thought about having a brand new set built off of this design. Also I was thinking of replacing everything with V-bands and then having them coated. Like I said for what I paid they were worth it.

Originally Posted by zukiracer19

before you even start, check and see if that rear flange is warped for crossover and header. because that will be the biggest pain in the ass if you put it together and you blow out a copper gasket... they aren't cheap... and please, please use copper not that cardboard crap; or aluminum. They will blow out the first time you boost. (from experience) I went through quite a few coppers when I was hitting 15 psi but other then that they hold up pretty good.

I'd go with 36 if you're not going to be going all out. That should be plenty; but if the price is right take the 42s.

Yeah I don't use anything but copper for my gaskets.

I could have gotten a set of 8 - 42lb Lucas injectors for $50 + shipping. They were from a very reputable place.

[HOYS]

I've seen them in person, they are pretty bad.

[G.I.Ceo]

Originally Posted by HOYS

I've seen them in person, they are pretty bad.

Cosmeticaly yes they dont look good. Like I said I got them cheap and I can always modify them or have a whole new set built. Its a start and the manifolds I didnt know what to do about them and then I stumbled on these. These will save me probably $750 in the long run no matter what I decide to do with them.

[HOYS]

First things first:

You need a turbo with a V-Band exhaust. You will also have to cut the car to install the turbo like Nick-G did. I think that down pipe hits the fuse box pretty hard too.

[G.I.Ceo]

Originally Posted by HOYS

First things first:

You need a turbo with a V-Band exhaust. You will also have to cut the car to install the turbo like Nick-G did. I think that down pipe hits the fuse box pretty hard too.

Oh I know I am very aware of what lies in front of me and thats the reason I am not rushing this to make people happy. I put a lot of time and thought into my work plus I dont cut corners. I just wanted these as a building block so I could start somewhere and get a list together of stuff I need and work that needs done.

[HOYS]

You shouldn't use 36lb injectors. If you looking at 300 HP at the crank without going above 80% duty cycle your going above what the 36lb injectors can handle.

You can find 42.5lb injectors any day on club GP for about 150 bucks. If you want to take the cheap route and start slow, 36lb injectors are a dime a dozen. Keep in mind you need to rewire the injector harness and get the new fuel rail brackets that allow for the taller injectors. IIRC the kit is 35 or so from Milzy.

If it was me, I'd go for 60lb injectors from the start (250 used on ClubGP rather frequently) and never have to worry about hitting 80% duty until 475 crank. It is just one less thing to worry about!)

[MAC the KNIFE]

^hoys, the guy with a milzy built racing block and 400 whp, is he using 60lbs injectors?

the 36lbs were maxed out a bit before 10lbs of boost and 320 whp. about 390 crank.
i'd go 42lbs for a nice turbo setup at around 10lbs of boost. but it depends on what you want your final hp numbers to be.

[AaronGTR]

36's are maxed at about 280 whp. If you are planning more than that, I'd go with 42's. Most people won't get to the boost levels needed for 60's, or have the engine and trans mods needed to support that power level, so 60 lb/hr would probably be overkill. For the injector harness you can wire new plugs on, or just swap the whole thing for a '99 harness, and only change the cam sensor lead if needed.

[zukiracer19]

I'm pretty sure cutting of the car is a given, its probably the most simple part of the entire setup imo. But not everyone needs to go that route; but Get a intercooler that has in/out ic piping the same side(driver side) and run them both up through where you cut them out and try to make them as straight as possible, less restriction the better. as for fusebox; that was my dilemma... If you can try to fit a 3" DP but im telling you now i had barley any room with todds setup. Vband turbo back is your easiest route; but if you can make everything vband.

[zukiracer19]

cutting wheel does the job fine!

[zukiracer19]

Also I made a heat shield for the wiring harness/trans because i had issues with the heat.

[HOYS]

Originally Posted by MAC the KNIFE

^hoys, the guy with a milzy built racing block and 400 whp, is he using 60lbs injectors?

the 36lbs were maxed out a bit before 10lbs of boost and 320 whp. about 390 crank.
i'd go 42lbs for a nice turbo setup at around 10lbs of boost. but it depends on what you want your final hp numbers to be.

Yeah, he has 60lb/h injectors.

If you have the funds to buy the 60lb/h injectors it gives you just one less thing to worry about. You won't get anywhere near static and you will have a low duty cycle resulting in a longer life for the injector.

Overkill? Yeah probably. But 100 more dollars for a part you almost will never have to replace...I personally would go that route.

[eckoxl]

i have 42.5.

[slw240sx]

so heres the deal. leave the headers as is, do not waste any money putting Vbands on those. i wont do it for you either, thats just a heads up. The 3bolt flanges fit together good enough. that down pipe,throw it away and get a 2.5" one made up once you get the kit on and ready to run. 3" will not really fit well with out moving a lot of stuff and modifying **** around it. 2.5 is all you will need any how, my shop has done 400hp on 2.5" down pipe and exhaust its plenty. but what ever is of that down pipe its junk toss it. that crossover has no provision for a wastegate so you can either add one, or get a internally gated turbo. or get a turbo that has a port on the exhaust housing for the wastegate and a 5 bolt flange that has the hole next to the 2.5" outlet for the wastegate. dont listen to these guys about getting a Vbanded turbo, save the money and use it to buy a wastegate. Vbanded turbo is not that much faster or easier to work with. They dont know , i do..... any thing anyone here gives you as far as advice take with a grain of salt because of the few that are giving it only one or two of us actually has a clue and or hands on experience. Zukiracer doesnt even count as hands on because dude is a moron...


blah i just got interupted by phone email, broken iphone problems and everything else as a business owner returning from a christmas weekends where everyone decided to buy off our ebay store. ill be back in this thread to finish my ideas of how to keep this build cheap but decent.

[zukiracer19]

I find 3 bolt flange header/crossover setup to be fine; But vband exhaust side/dp is so much easier to work with... jus sayin... But my dp was a 3 peice.

[G.I.Ceo]

Originally Posted by eckoxl

i have 42.5.

So whats the difference between 42lb and 42.5lb?

Originally Posted by slw240sx

so heres the deal. leave the headers as is, do not waste any money putting Vbands on those. i wont do it for you either, thats just a heads up. The 3bolt flanges fit together good enough. that down pipe,throw it away and get a 2.5" one made up once you get the kit on and ready to run. 3" will not really fit well with out moving a lot of stuff and modifying **** around it. 2.5 is all you will need any how, my shop has done 400hp on 2.5" down pipe and exhaust its plenty. but what ever is of that down pipe its junk toss it. that crossover has no provision for a wastegate so you can either add one, or get a internally gated turbo. or get a turbo that has a port on the exhaust housing for the wastegate and a 5 bolt flange that has the hole next to the 2.5" outlet for the wastegate. dont listen to these guys about getting a Vbanded turbo, save the money and use it to buy a wastegate. Vbanded turbo is not that much faster or easier to work with. They dont know , i do..... any thing anyone here gives you as far as advice take with a grain of salt because of the few that are giving it only one or two of us actually has a clue and or hands on experience. Zukiracer doesnt even count as hands on because dude is a moron...


blah i just got interupted by phone email, broken iphone problems and everything else as a business owner returning from a christmas weekends where everyone decided to buy off our ebay store. ill be back in this thread to finish my ideas of how to keep this build cheap but decent.

I was thinking of getting a turbo with a internal waste gate but I know it would be easy to add one if I needed to. I'm not sure how the previous owner installed a waste gate on this setup.

I will definitely take you up on using a 2.5" down pipe so I don't have to screw around with stuff I don't need to.

[eckoxl]

They are the same thing.