most of u guys know the build on my iroc its changed a few times already
went from a single t6 76mm turbo to twin 57mm turbos with tpi and a megasquirt.

im ditching the tpi and swaping to carb this time around

so far on the list of parts is
edlbrock torker 2 intake 50 bucks
holley 650 dp 70$
spectre carb hat 100 bucks
im going to reuse my old fuel system twin aremotive 340lph intank pumps though at carb presures one will flow over 400lph so i will remove one pump from the tank

i still havent figure out how to get the fuel presure down to 9 psi i.e which regulator to buy but i need a bypass style regulator to get my base fp down to 9 psi and raise fuel presure 1-1 with boost

for right now im going to do a very simple ignition system im going to keep the smallcap gm hei distributor the nice thing about these is they will run without an ecm

i will install it at 8*btdc @ 2500 rpms it will add in 10* advance all on its own for a total of 18* a nice safe starting point for boost. but will be crappy for non boost driving. though shouldnt be to much of an issue since my setup spools up pretty dam fast even unde rpart throttle conditions

down the road i am going to swap in a mechanical hei and limit the mount of centrifical advance and also limit the vacum advance

this way i can still have enough advance under vacum when cruising and limit total advance when in boost


soon as i round up the carb i am going to document the mods required to ru n the carb in the blow through config as well as the tunning of the carb

 

subscribed!!! Im doing a blow thru as well, but what i did is followed http://www.hangar18fabrication.com/blowthru.html as best as i could. Are you going with the Spectre 4 inch carb hat? http://shop.advanceautoparts.com/web...3B_P%7CGRP2026_____

 

im going to be doing the same mods,if all works out well with the carb i will spend some mony on a new proform main body and some other parts

as far as the hat i was going to go with the 100$ spectra 4 inch hat but before i buy on im going to see if i cant find a decently priced used ev hat since all the high hp guys swear by those.

though the spectre hat has really great reviews as well, they also have a low profile carb hat but that is supposedly really bad for forced induction apps

 

what intake are u going to be using on ur setup?

 

Since im not going for big numbers i just used all the same parts that was picked from my engine rebuild. Its a edelbrock rpm air gap intake. This is it, prob not the exact one i bought though http://www.summitracing.com/parts/EDL-7501/ . Ive read some pretty good reviews on the 4 inch spectre hat, and if you buy through advance auto with the discount code VISA, you should get it to your door at $60 shipped.

 

i dont know if i would use a dual plane intake,from what ive been told some of them have some pretty uneven fuel distibution.

thats why im going with the single plane

 

Are you making any other major changes besides removing the TPI? I'm curious to see what kind of differences you see from that alone.

 

I will admit from what i have read to that the single plane has better fuel distribution. But on the other hand many other people have used both with equil results. Not saying for a drag car but for street use mainly. You will have an easier time tuning with a single plane, but it also depends on the dual plane as well. When i had my engine rebuilt, i used the air gap because it was for an N/A street use. When i dropped the engine in and had everything running, i took the car for the first drive and it wasnt what i expected.

 

probably not, though if i like the carb setup i may swap to a set of vortec heads since a carbed vortec manifold is alot cheaper then a vortec tpi base

 

I use a Mallory 4309 its been proven to flow enough fuel for 1200+ hp or you could also get an aeoromotive 132 02 but that thing was too big for my taste I have the Mallory on my ta and will be using the aeoromotive on another current project both are bypass regulators

 

i think i have come up with a much cheaper option

ill get a 6 inch long piece of fuel rail extrusion, one end will be the feed from the tank, on the other end im going to use one of the ebay afpr to bring the fuel presure as low as i can get it.
prolly be about 10-15 psi .
that regulator will be connected to the fuel return line

in the middle of that fuel rail i will conect another afpr that i will set to 5psi base which will also tee into the return line.

and since those cheap ebay afpr are boost refrenced it should work just fine and cost me about 1/3's of the mallorys or areomotives would cost just for the regulator


this swap is looking pretty dam cheap atm as well

found a carb for 100 bucks
intake for 50
ill have 50-60 bucks in the fuel stuff
60 bucks for the spectra 4 inch carb hat
and whatever money in the new carb floats
+ 35 bucks for a holley master jet kit

and whatever the correct bracket ill need to tput on the carb for the 700r4 tv cable

 

http://www.summitracing.com/parts/TFS-20000/ That bracket will be good for the fuel linkage and TV cable.

 

nice bracket though not th one i meant, i meant the new arm that goes on the carb linkage witht he correct geometry for the 700r4 tv cable

 

Hey bud, i got a question for you. My original engine was a 305 TPI and after it was giving me problems i swapped it for the one i have now. Since now i have a carbureted engine i used the mallory 4309 regulator with the stock TPI fuel pump. That setup was for the N/A 350 and now that im adding the turbo, do you think the stock pump is good enough? Its not going to see boost over 8 PSI max, so im going to have it set at 5-6 psi all the time