browncamaroz28

iTrader: (1)

Ok so I'll go through a lil background on the car so you guys know what it has in it and you can see the mods. as i do them.

Year: 1982
Model : Z28
Engine 305ci (p.o.s.)
Trans: NWC T-5
Color: Brown

Current Mods: Edelbrock shorty headers with 3 inch collector, performer carb. (600cfm), manifold, and cam, dynomax 3 inch cat and 2.5 inch catback, full autometer gauges, shelby gt500 roll bar, sparco 3 point harnesses, 96' trans am cloth seats and disk brake rear end, jegs torque arm, custom dual electric fans, rear light covers, and an optima redtop in the trunk.

Here's the plan for the build.... It starts with a single TO4 'P' T61 that i just bought....which are attached below. Now I plan on getting this set-up to work on the 305ci at about 5 psi until I have enough money to build the 350ci crate engine thats sitting in my shed.

Turbo Location: I will be putting the turbo under the front passenger's feet right where the cat. is right now. Since i don't have the turbo to do a test fit I'm not completely sure on how much of the floor i will need to cut, reshape, and reweld.

Turbo Oiling: I will mostlikely get the oil supply from a T fitting that i will put on the oil pressure sending unit, it will then run down through -4an line into the turbo. The return will have a small sump area where it will be connected to a line that will go to a small electric pump that i picked up from Mr. Gasket for $28.99... from there it will be pumped into the area that housed the manual fuel pump, basically a plate with a welded fitting. (EDITED)

Wastegate: 38mm Tial style external gate, with a 4-5psi spring

Fueling: The fuel will be supplied by a walbro 255lph pump that i have sitting around. It will then go into a custom set of fuel rails that i will be makinga, and then through the 42lb/hr Bosch style injectors... and the remaining fuel will go back through a SX bypass style regulator . At will all be controlled by a MegaSquirt-I computer system. (EDITED)

Intercooling: I don't believe in it haha well not right now atleast, i will set one up eventually but i just want to get it boosting and see how everythings goes before i get into that.

Ignition: 8 pin HEI with the MegaSquirt-I controlling it, 1 step colder set of plugs from stock

I'm open for all suggestions so let me know what you guys think..... I'll keep this post updated as i go.

Eric

Sonix

iTrader: (1)

Why?

calebzman

iTrader: (3)

How are you going to retard timing under boost?

Are you going to setup the carb for blowthrough? bonnet choice?

I'm also curious about the turbo placement and its specs.

88 Z28 Guy

iTrader: (1)

I say put the turbo where the catch can for the radiator is, i saw another 3rd gen on this site that had a twin set up on it and he had one on each side and it looked nice, i think he used modified S10 LT's.

ttypecamaro

iTrader: (2)

I like the "semi" remote mount idea. I've heard of many people talking about or considering doing it, but no one ever does it. I wonder if there will be a significant difference in lag and turbine temperatures? That would make oil lines cheaper (than a rearmount).

using the fuel pump as a return sounds like a good idea, I personally would be hesitant to try it, but I don't know much about mechanical fuel pump operation. I have a transparent (Teflon) oil line on my driverside turbo and I've found that there really isn't enough oil flow to require such large (1/2"I.D. -10an) oil returns as I have, 3/8" (-6an) should be fine. I'm talking about gravity drained vertical flow, though.

How does a mechanical fuel pump react to aerated fluids/oils?

daves12secV6

iTrader: (3)

i recognize those pics from ebay,did u buy an xspower turbo?if so be careful with it,have heard alot of bad things about them,even though i myself have an xspower turbo,i have not run into anyproblems with the turbo yet(*knocks on wood)

browncamaroz28

iTrader: (1)

Location why? just because its easy and when i pop the hood it will just look like i have a cold air intake.

As for timing, I'm still figuring that out but i do know i need to pull a few degrees per pound of boost so when i figure that out i will update. And it will be a blow through for now with a carb bonnet.

Using the fuel pump as a return pump is just a shot in the dark, i figure if it doesn't work then whatever i'll just buy a sureflo....

Ebay turbo... yup thats right, but its ok if it blows up it blows up... right now its on a pos engine and its not my daily driven car, i have a 2002 wrx for that. so this is really just a toy that can sit. plus if it does blow up in a year or two hopefully i will be out of college with a high paying engineering job so i can just buy the gt42r that i dream about

daves12secV6

iTrader: (3)

brown get and msd btm they plug right into the gm wiring if u buy the adapters from msd

browncamaroz28

iTrader: (1)

i was going to do that but i think at that point i will just spend about $100 more and get a megasquirt II which controls fuel and timing... now yes i said i have a carb. but i also have a set of injectors and a fuel pump from an ls2 so i may just go the route of full EFI... i'll figure that out though after i have the turbo set up because either way i will be using the manifold and carb. just one way the carb acts as a throttle body....

browncamaroz28

iTrader: (1)

so it turns out my friend had a MSD BTM brand new for $150 so i picked that up. now i have to wire that into my HEI system and i should be golden. Dave do you have much expirence with the btm?

ps- here's a pic of the engine bay as is sits now, and also the btm that i just bought

daves12secV6

iTrader: (3)

yeah what do u need to know?

browncamaroz28

iTrader: (1)

what kind of baseline settings should i go with.. like it has a start point that goes from 0-5psi.... and then a setting per psi that i thought i would start at -3 degrees per psi and then work my way down...

also a lil update, got an autometer boost gauge that will make a nice addition to my custom gauges....that in this picture have an unpainted bezel...

daves12secV6

iTrader: (3)

yeah start at -3* per psi its really all dependant on the individual engine on what works best,if ur only gonna run a few psi u prolly will only need to pull 1-2* per psi.i actually got rid of my btm since i didnt need any timing retard.i only had to pull a few degress base timming

browncamaroz28

iTrader: (1)

yeah i plan on raising the boost quite a bit... 5 pounds to start then as i get the 350ci closer and closer to completion i will raise the boost... since the 305 is not worth crap i will probably run it up to like 20psi or til bust, whichever comes first.... it should be fun times haha

92centexcamaro

lol dairy

ttypecamaro

iTrader: (2)

Sounds like my method! I just cranked mine to 14 psi. Now my 38# injectors are at 93% duty cycle (that calculates around 515hp at the crank, but very rough). Intake air temps are only 112*F, but the clutch is on fire!

I also wanted to say that I'm pulling a ton of timing to run this boost. I'm running 13deg total timing at 14psi. My static compression ratio is 9.4:1. 15 degrees gave detonation, I might be a little lean too... 12.6-12.8 AFR

browncamaroz28

iTrader: (1)

yeah i know i can't spell.... im an engineer sh*t happens

time for bigger injectors, fuel pump, and a tune.... speaking of injectors i have a set but i can't find any info on them, i was told they were out of a 2005 GTO but ii don't think they are because i looked up the part number (12578722) if anyone has some info that would be a great help.

Willie

iTrader: (1)

Engine 305ci (p.o.s.)

Hmmmm.... I wouldn't say that....(see sig). It has a bore and stroke that's almost perfect for positive pressure and the wall thickness between cylinders is substantially beefier than a 4-inch bore block (350). The 305 can be built like any other block. People typically don't because you can spend the same amount of cash to build a 350. But I'm not typical I guess. I'm proud of the fact that I run a 305 (see pic). I know others see this hood "designator" and probably laugh at me. Until they watch my taillights pulling away that is....

I also like my 281 in my daily driver too with 32 valves, four cams, supercharger rated at 390 horses. We all know, at least I think, that these engines can make 600+ hp while still being driven daily. For example:

Inside Line: Horse Power: Ford's 690 hp SVT Mustang Cobra -

It also has a bore & stroke very similar to the 305.


yeah i know i can't spell.... im an engineer

I wouldn't say this either. I'm an engineer too and I know how to spell, capitalize the proper words, punctuate, etc..... Yeah, I'm probably a minority, and proud of it!

browncamaroz28

iTrader: (1)

MY 305 is a POS... as for engineers not being able to spell i was just joking away my typo...

browncamaroz28

iTrader: (1)

So I’ve made some really drastic changes to my plan of attack for this turbo project....

EFI, I will be buying a Megasquirt system, running a custom set of fuel rails with 42lb/hr Bosch style injectors... it will be on an Edelbrock Torker II manifold with a SHO throttle body. I will still be using the Walbro 255lph in-tank pump and a SX bypass style FPR. The Megasquirt will also handle ignition retard duties with the Procomp. late model 8-pin distributor shown below.

Has anyone had any experience welding to an Edelbrock cast aluminum manifold? I need to put injector bungs in but i don't know how weld able it will be and what alloy i should look to use... Also I was planning on going and using the -10an fuel rail blanks from Ross Machine Racing :: Home , what do you guys think?

Eric