hey guys,im gonna be ditching my 60* v6 shrotly for a 4.3 vortec engine.
im not really good with compressor maps and was wondering if somone could help me figure out how much boost my t04e stage 3 57 trim turbo would be good for on the 4.3.im trying to use as much stuff from my 3.1 turbo motor as possible.i figure when all is said and done ill have the heads ported and ill have a turbo cam installed in the 4.3 and i prolly wont rev it more then 6,500 rpms.

im planing on running anywere form 7-16 psi on the 4.3 if my turbo is big enough

thnx guys

 

 

lmao,hey at;eat im keeping the car a v6,anyways only reason im getting rid of it is cause i got offered a good deal of money for my fully built 3.4(im actually not gonna lose money seling it).im sure ill have another turbo 60* car in the future.

 

It'll work I wouldn't turn it much past 5,000 though assuming you're getting peak power about that range, you're gonna be maxing that turbo pretty bad IMO. What's the A/R on your turbine, I'd probably be looking for a .63 minimal, maybe stepping to a .84. With a cam I wouldn't run that past 5-7 PSI though. I'd bet you make 275-300hp with just a cam, intake and decent exhaust. (Playing with Engine Analyzer I found out that a 208/208 CPI cam with the vortec heads combined for something like 257 N/A HP, to give an idea) May be time to call up someone and have em throw a new wheel in the compressor....

 

mine has a .63 turbine and .50 compressor,it looks like ill be stepping upto a either t61 with a .84 turbine.or possible a t70

 

the 61 would be where I'd lean if you wanna keep it streetable. That's a wicked turbo and it should have 10s in it with race gas too. Buddy of mine went 10.60s with a TA-61 in a 3800# T-type, with less cubes. He also went 11.6es with pump+alky. The T61 should give a bit more hp too due to it being a 4 bolt turbo and the compressor differences. Most of the Buick guys are running 3200 stall or so with these, however you've got half a litre more displacement at your disposal, not to mention Vortec heads which means if you're going auto I'd probably be looking at 2800 give or take (probably better to talk to a converter shop about it)

 

well i have a 2004r trans and a 2,500 converter already, so ill try out that converter for starters.right now im debating on buying the t61,or running twin t04e stage 3 57 trims.my main concern is gonna be engine management,i have a megasquirt system ready to go in the car,but im debating on that or swaping to the sd ecm and running the cyclone/typhon code
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damn i didnt think a 4.3 vortec v6 could make that much power with just a cam/manifold and good ex.Whats a latemodel stock 4.3 vortec motor put out for power anyway?

 

What kinda hardawre do you have for the '30 box? If it's not like the ROMulator I'd forget it and put the MS-II in; if you really wanted to you could just tap the harnesses wires as necessecary and leave the connectors then switch to the '7730 if you so desired later.

ED:didn't see your second question; think about how many vortec combos are making 400hp out there with stock or nearly so Vortecs on 350s, and you're running 3/4 of a 350. Hot rod also had heads in a N/A 4.3L (HEAVILY ported TBI ones, 208/190 I/E) that flowed something in the territory of stock vortecs and made 315hp on a 9:1 N/A motor; they then made 500 or so on a charger. The exhaust on the Vortecs is behind that some, but the intake is ahead.

 

wow !!!! this thing should make more power then i planed for,i was aiming for around 550,but after seeing that im quessing something liek 625+ shouldnt be unrealistic.so far everyone ive talked to has told me to ditch the 2004r for a glide/w brake,but im not thinking it would be that enjoyable on the street,and this car is my daily driver so,im still undecided on what im gonna do for the trans,but im deff gonna skip over the sd ecm swap and go striaght to megasquirt
still undecided on turbo as well right now its a tossup between twin t04e's,or a single t61

 

Hrrm, ever thought about a pair of 57 trims on that 4.3L? the tools from turbofast say you'd be right in the "sweet spot" of a pair of these.

 

like my to4e stage 3 57 trims?

 

yeah, Ray Hall Turbocharging - Java calculation applets play with these some

 

yep looks like twin to4e's would be perfect,i gota look around and see some pics of what everyone does when they go twin turbo to see how they route the pipes to the intercooler though,to get an idea of how hard its gonna be.that will prolly be the biggest deciding factor of wether or not i decide to go twin turbo or one large one

 

Having the V6 in there will give you 6 inches more room or so in front of the engine then a 350/305 TT setup, just somehting to keep in mind when looking at pics.

 

well how much clearance to the hood do u guys that mount ur turbos over the valve covers have.im a lil woried about the turbos being to close to the fiberglass hood.