Out of curiosity what does it take to convert from a TPI to a single plane multi port injection setup? I would like to retain my stock computer and wiring since ill be converting it over to EBL-P4. I am running a paxton so ill have to run some kind of hat I guess??

 

Was thinking Something Like this.
http://www.ebay.com/itm/SBC-CHEVY-Hi...sories&vxp=mtr

With something Like this.
http://www.ebay.com/itm/EDELBROCK-38...sories&vxp=mtr

Then I would run some kind of fuel rail setup and an LS1 style throttle body? Thos are pretty plentiful and should be easy to pick up at a scrapyard or on craislist. Maybe a truck one would be pretty cheap. Then a Zex Perimeter NOS plate for my NOS.

 

Run that intake with an elbow like that that will take an ls1 type tb. Use ls1 tps and iac and they will splice right in and work with ecm. Need the pigtails which you can buy online from a few places. The wires for me actually color matched the tpi harness so it was easy.

Then get a throttle cable from a late model fbody. Hopefully the elbow you buy has a bracket for the cable to sit in else you need to make one. I just made an L shape bracket that bolted to the carb flange on the single plane using the bolt that holds the elbow on it.


Other way is a mpfi 4 bbl type throttlebody with carb blower hat but not sure if the sensors match to the tpi computer and harness

 

Then the question is how do I hook up my TV cable?? Dont think the 4l60's in the LS TB's had one did they?

 

Set of rails.
http://www.ebay.com/itm/SMALL-BLOCK-...sories&vxp=mtr

Im guessing Ill have to run some Kind of AFPR. How would it connect idealy? Single in two out to the rails and one return from the regulator?

 

Oh sorry i dont have a tv cable trans anymore but i thought lokar made a bracket for one? Id have to search.

Fuel rails you could run any external regulator. Use hardlines on body with adapters to -6 braided line. Could run front or rear of rails. Run single in front cross over on rear and back to body return line but put the regulator inline maybe mount to body there?
Or run 90-120 deg bends off the hardlines to rear of intake. Feed into 1 rail cross over in front and mount regular back behind intake by distributor. Return line back to hardline.

Or look for a rail mounted regulator. Most smaller externals can be mounted to a rail anyway. Mine i put on the firewall next to dizzy but its not nhra legal to do so but no one has said anything

 

If you went victor e efi you may beable to use holley stealth ram rails and regulator which mounts to rail. Real nice setup buy some report holley regs failing. I never had an issue. Upgrade reg for those rails is the kirban buick grand national regulator

 

I was kinda thinking of running the out line from the regulator to the back of the drivers rail then crossover on the front then the rear passenger could be the out to my NOS. Everything else ran through the regulator.

Seen this on summits site. Would work good but not sure what it means by the IAC in the notes. Kinda pricey.
http://www.summitracing.com/parts/EDL-39783/

 

Yeah those tb's would work but i am not sure how the iac and tps sensors work. I do believe some members are running a setup like that however.

If you need a fuel line to the nitrous fuel solenoids they make fittings with 1/8 npt threads installed so you can tap off them for fuel. You would only need a -3 or -4 line for that. You could put that fitting directly to rail. Holley fuel rails already have an npt threaded portion in the rail for schrader valves or fuel pressure guages. I used that for my old nitrous feed. Vic e efi rails dont so you need external fitting.

Try to model it like factory. You have one line into one rail and a cross over at opposite side and exit thru a regulator.

 

Thats something I dont understand i guess cause im a carb guy. Would you want the pressure regulated before it hit the rails and injectors? How is a regulator at the end gonna regulate the pressure before. Oh wait un less it regulates it by how much it sends out to the tank. Sorry just thought of that while i was typing.

Yeah my NOS is currently running off of the fuel pressure shrader valve in my TPI setup. Didnt see anythink like that in the cheaper rails though. Kinda doing this on a budget if i can. Somehow though budget and EFI do not go together in the same sentense. lol

 

Fuel goes through rails first , regulator holds set pressure in the rails and bleeds excessive pressure back to the tank
As shown supply line goes to the pass side rail , return from bottom of reg

 

This setup is pretty much what I was thinking of doing But i found the LS setup first doing a search in the power adder section. Would there be any advantage to using this over an elbow and LS style throttle body? Other than i would need some kind of hat for my SC. What kind of computer and wiring were you using with this?

I thought about the regulater setup bleading the excess fuel off while i was typing my last post and it made sense to me but the way you set your up directy on the rail is sweet. I was just thinking of running mine over on the fender or firewall somewhere but this would be a much easier way to do it.

Just out of curiosity what did that cost you to setup and what were you running it on?

 

Found this on ebay. Looks nice. Not sure if it is but Its fairy cheap.

http://www.ebay.com/itm/CNC-Machined...item5ae41ea6b6

 

Found this as well. Looks like it might work well with the 700r4 kickdown as well as throttle cable and what not. Kinda pricey though.

http://www.ebay.com/itm/Holley-112-5...orcev4exp=true

 

Doesn't appear to have provision for the GM style IAC that the Holley version has

 

Yeah I noticed that after I posted it. But there not alot of info on it at all. Gonna try and find the manufacturer today to see what's up. Also bbk has one that's a bit cheaper than the holley one.

 

I attached 2 pics of my setup, ran 2 -6 braided lines to the rear of the fuel rails then a crossover to the regulator..... for a bracket I still need to order but I am going with one from jegs its part number 555-15230 and the kick down adapter is 555-15229 ...... I don't have a stock computer or harness but its pretty much the same hook ups as tpi...for my TB I bought it used and had older style plug ends and FAST had the adapters I needed....for a boosted car I would go elbow but for motor/nitrous id go the 4 barrel TB

 

This is another shot of how I Y'd to the 2 rear lines before I tucked them away and cleaned the wires up

 

You would need a remote IAC housing. Not a big deal, but just pointing that out.

-- Joe

 

Explain Please??? How does a remote IAC housing work? If its on the tb i could understand it adjusting air flow but remotely?

 

Very Nice setup by the way. Im curious though. Is there an advantage to using an elbow and ls1 TB over a 4150 style or vice versa?

 

Vac line from intake to remote housing. Iac sits in housing, controls air flow into vac port on intake.

-- Joe

 

Found this to hookup the tv cable to a LS1 style throttle body.
http://www.bowtieoverdrives.com/cata...php?ITEMID=225

 

What kind of NOS plate would I run with this kind of setup? Would I need to run some kind of fogger setup or could I run like a standard 4bbl plate setup?

 

If you do the intake elbow just run a carb plate kit. Or if the elbow is designed for ls1 tb then you could run a power ring type system that mounts behind tb on the elbow. A tb spacer with spray ring all around it. Nice setup

 

I have a Ported LS1 TB with provision for TV cable. Also, Aaron's 4150 intake elbow. Actually, everything but the electronics to get the LS1 TB hooked up.

https://www.thirdgen.org/forums/engi...ne-intake.html

 

How important is it to be sequential on the 4 barrel TB units? At NHRA event I saw a Holley unit that was seq.

I see accufab is seq.

http://www.accufabracing.com/index.p...cid=1&Itemid=5

 

Out of curiosity why are you switching from that setup to the 4-barrel TB? Im still on the fence about which i should run.

 

Ronny I think you mean progressive. It allows for a little more precise throttle control with your foot. I really don't think progressive linkage would make too much of a difference.

Those intake elbows have been said to cause some air distribution issues, although not enough to cause any problems.

 

Found this package. Throw in some injectors a TPS and remote IAC and Would get me started. Maybe change to a bigger better TB later on if its working ok.

http://cgi.ebay.com/ws/eBayISAPI.dll...tchlink:top:en

 

On the ls1 cars with engine so far back they cant get an elbow with a smooth radius curve and have to make a very tight bend. They have seen some big hp losses because of this and switched to 4bbl tb. Now cars with cowl hoods and an elbow that rises up smoothly over a larger radius bend, theres less flow loss and hp is restored. Could be distribution issues with some elbows but a good smooth radius bend will not or atleast not enough to make a difference. Some you can get a built in divider to help bring some air to the front 4 cylinders.
Mine is like this and is a tall rise long bend type. Need a 4" cowl to really clear it as it has a 3" rise from intake flange to base of tb flange. But its good volume for plenum and smooth radius for lower flow losses.

Now my buddy i believe has the wilson intake elbow short 90 deg bend on his single plane with 90mm tb or 102mm i cant remember. It did pick up alot of power over a stock port miniram. His intake elbow is a short rise quick 90 deg bend but air is still able to pass thru it well. Some ls guys using it also report better air flow qualities than the low rise elbows

 

Great Info!! Either way im out about the same amount of money I think. Ill decide one of these days. I really appreciate all the info though. Keep it coming.

 

Yup progressive is the word!