cosmick

I've spent days reading in here, I like the RamJet, but it runs $560. And since the whole L31 engine is still under $250 complete, from the local Pick-N-Pull yards, I was thinking about just keeping the manifold they include for free. Plus it even has EGR. Unlike the rare, costly, iron marine L31 version.
I found threads on other forums about this, but they want to keep the stock plastic upper.
I never got the L31 base, I always left it lying in the yards, but as soon as I get another one, I'll be cleaning it up, then seeing about fitting conventional injectors.
This is going to end up requiring a fabricated upper manifold half, and mine will be 1/8"-thick mild steel for ease of welding and for turbo boost.
Normal injectors just need a 35/64" hole, but those injector bungs from FAST require a 0.880" hole. They're only $60/set.
I already have a spare LM7 TB, so I'll incorporate that.
This probably won't get much progress right away, but I'll add pics. It should be running sometime in 2017.
If anyone wants to post up any images of any computer models or other renderings, feel free, but I plan to figure out the fuel delivery before letting that affect the final shape of the upper. I don't care how it looks, beyond ending up with nice welds and some paint on it.

robertfrank

iTrader: (27)

I used to have a 96 Silverado with the CPI 350 and I myself was wondering what could be done to make the stock intake better. I know they sell spacers to lift the plastic cover an inch higher for better flow. I even thought about fabbing up a way to run the injectors and rails underneath the plastic intake and fab up a way to run the fuel line through the intake itself. I sold the truck and never got around to it. Have you thought about getting an Edelbrock rpm and adding bungs and rails? Might be an easir task

cosmick

Thats where my thoughts went after seeing the cost of the RamJet, the HSR, and the Edelbrock ProFlo XT.
Because I want boost, a vertical TB for horizontal flow seems better to me than a horizontal TB the way you seem to be suggesting, like a stock L31 was. Edelbrock casts a few different intake elbows to do that, and then the TB can end up forward like an LSx / TPI, or sideways like the '86-'95 Mustang 5.0, but by the time you buy that, the cost is steep.
I was thinking about modifying a cheap Summit single-plane high-rise carb style, but it's too tall and still costly. The manifold is $200, the elbow is $140, the bungs are $60, then there's still injectors and rails.
I want to keep this under the stock hood.
If I use the L31 base, that will help with getting all the injectors at the same angle, and the same height, without using a mill. I know a guy who has an old Bridgeport he will let me use for free, but he lives too far away for it to be practical.
I think the rails will have to pass through the new upper intake, so it may need to have a removable lid. It may have the sides topped by a flange, bent inward, with nuts welded under, so a top plate bolts down onto the sides. I was originally thinking of one boxy bowl with long bolts down through the whole thing, but I'm thinking I'll add more bolts into the GM casting
I want it to hold up to 20.6 psi of boost, 2.4 bar, without leaks. So the fuel system will need bulkhead connectors. A rubber grommet won't do.

cosmick

https://www.summitracing.com/parts/sum-220682/overview/

cosmick

Something like this:

cosmick

This will be my first attempt at the fuel rail: https://www.summitracing.com/parts/f...224b/overview/
Obviously it needs cut in half, drilled to 17/32" for injectors, and tapped for A/N fittings at each end.
I need to research this more, and will post my findings, so you can argue any mistakes, and so I can keep all the part numbers together.

Those bulkhead connectors I posted earlier may not be the final size, but it shows the style I had in mind.

If they prove needed, the Fast bungs are FST-307017

cosmick

11/32" ID fuel rails equal a -6 AN, so that's a good start.

cosmick

Looks like a 1/8" NPT

cosmick

4 of these and a common 1/8" NPT tap should solve that
https://www.summitracing.com/parts/sum-220646/overview/

cosmick

I plan to control it with an 0411 PCM, I have a spare set of LM7 coils, and here's how I will get the 24x crankshaft position signal. https://www.eficonnection.com/home/p...row-timing-set

The L31 distributor can supply the camshaft position signal, but this means using a top quality timing set that won't stretch. Or replacing the stock chains frequently. I'd rather pay more up front, when it comes to timing chains. I'll post the best one, in my opinion, that I can find.

cosmick

https://www.summitracing.com/parts/c...157x1/reviews/
Good enough for me. And only $22 more than stock. Cloyes makes a 3-keyway version for $8 more. I'll be checking it at 5K miles to see if it stretches. But Summit isn't showing anything better.

cosmick

I had a set of these once before, not sure if I can make them work, but they're 50-pounders so they're good to 800 HP, plenty for me. I'm not one to run 80s where 50s will suffice, smaller makes idle and emissions easier. https://www.summitracing.com/parts/a...3412/overview/

robertfrank

iTrader: (27)

To be honest, is you're gung ho on a top Mount set up I'd just get an Edelbrock vortec manifold on ebay for cheap, weld in some injector bungs with some ebay rails. Make an adapter plate for the LS throttle body and run that. Probably on be in it about $250 with far less headache. For my LT383 I'm running a cheap hurricane intake, a transdapt carb to tbi plate and a modified 454 tbi unit running with out the injector pod. I have about $250 in mine and it's more than enough for what I need. Could be something to think about maybe

cosmick

That still orients the TB horizontally

robertfrank

iTrader: (27)

Ok so if I'm correct you want the throttle body forward facing? I'd go with this then. I was planning on this for a future build and it accepts an LS throttle body
http://www.jegs.com/i/Edelbrock/350/3850/10002/-1

robertfrank

iTrader: (27)

I saw this youtube video with a 4.3 running a carb intake converted to fi running this bonnet. That's where I got the idea

cosmick

I already thought about this: https://www.summitracing.com/parts/edl-3847 on this: https://www.summitracing.com/parts/sum-226051/overview/
But that's still $300 more than using a stock L31 lower, plus the L31 lower has EGR.
Think more like a SuperRam with the injectors and rails inside the plenum.

robertfrank

iTrader: (27)

The summit intake is basically the same intake I have.

tylercamaro

iTrader: (1)

subd for this

cosmick

http://forums.holley.com/showthread....old-Conversion

https://grassrootsmotorsports.com/fo...d/42413/page1/

robertfrank

iTrader: (27)

Ha that's funny. I've been contemplating switching over to am Edelbrock RPM air gap and converting it to use fuel rails. On a side note, I've been really thinking about selling my EBL Flash and getting the new FITECH setup

cosmick

If you can afford to give fitech at least $795, then you have at least 4x more disposable income than me. More like 6x if you're buying a new RPM AirGap Vortec for $317. For that money you could turbo whatever you already have.
I'm looking at a free manifold regardless of torque production. The only other EGR intake for Vortecs is the GMPP Performer EGR for $342, or maybe a Performer TBI for $447.
Being in West Jordan, there's no way you can enjoy yours on the streets without EGR, you can't pass the annual emissions without it, and without that, no registration. so why waste $1 on any non-EGR option? Planning to fit an EGR setup for the smog test, then go non-EGR the day after?
That's the main reason I'm keeping my LG4 and returning it to stock, so I can get it tested with that, then swap it for the good engine the next day. 362 days of fun for 3 days of hassle

robertfrank

iTrader: (27)

Well for me I'm not running vortec heads, I'm running an LT based 383. It would be a modified RPM air gap intake. They pop up on ebay for cheap often. As far as emissions, my 88 is still registered in AZ till 2018. I'm not worried about that lol. Even then. I have a guy here in town that gives me the hook up on inspections. So I pass regardless. It's not that I have disposable income as I'd have to sell what I have to get the FITECH lol.

robertfrank

iTrader: (27)

This is my setup

cosmick

Everyone claims to have the hookup, but every single time I've ever tried to pursue it, either they backpedal, or whomever they send me to takes my money then fails my car anyway. They can't sneak you through with a car that won't pass, they work at shops with cameras, and if they get caught the tech goes to prison and gets fined many thousands of dollars. The EPA knew this was happening, that's why it's no longer possible. So why lie? We could have been friends, but now you just cost everyone else the chance to watch my progress and see my results. I'll post a teaser pic at the end, just to prove it works, but damn you for effing with me without cause.

robertfrank

iTrader: (27)

What?? Why would I lie dude? I got my car passed with the dude leaving the sniffer sitting on the ground. Me and a few other guys have gone to the same place with the same results. No need to be so sensitive about it. Even then, I was just making a statement, not a recommendation.

robertfrank

iTrader: (27)

Hell I was wanting to help you succeed, maybe even brain storm through some issues you might have.

dmccain

iTrader: (2)

Don't let it bother you Robert last week he was lashing out at COTM winners saying it should include "beaters" and accusing the people on there of being a rich 1%. Robert I know you to be honest and straight up guy and very knowledgeable and helpful on these cars.

tylercamaro

iTrader: (1)

ill be that guy, fitech was the most god aweful excuse for fuel injecton i ever came across

bogo

Anyone knowing more about the plenum box in the video? I could not find anything similar in the Edelbrock catalogue nor Summit. Maybe discontinued?

gta324

Check outdoor part.nbr
38503