project89

iTrader: (1)

as some of u guys know i was going to build a x275/outlaw 275 car well its not comming to my local track we got quick 16 instead , i dont think were ever going to get x275 here so im not going to bother sticking to the 275 rules

heres what i have so far

iron eagle tall deck block
crower crank
pro mod rods
j.e forged pistons
427 ci
picking up some afr 245 heads
havent decided on an intake just yet
and cam is still undecided between hyd roller or solid roller

i was going to go with a single 88mm or twin 72's on this engine but now i figure i just want to get the most out of it since i dont have to follow rules limiting my turbo size

ideally i still want to be able to street drive this thing

were would u guys go with turbo selection on this thing not having any restrictions
twin 76's?
twin 88's
single 88
single 101/6

more then likley this car will see the track 6-10 times a year and bonneville salt flats once a year

i was going to get a powerglide for the car but im pretty sure im going to stick the 4l80 back in it with a 3:23 in the dana 60

1bad406

iTrader: (1)

Single 88. Dana's are HEAVY, usually only see them in older built race cars now days.

FSTFBDY

iTrader: (33)

No rules, they that bad *** huff some air. Twin 88's

83 Crossfire TA

iTrader: (2)

That would more depend on if the ultimate speed, street driving or the possibility of some other rules restrictions will get in your way. If it was mine I'd probably go with twin 76s. End up with something a little more streatable and still have an upgrade path if u need it later. Single 88 would be my second choice

DIGGLER

iTrader: (1)

twin 76's or 88's if you dont have any restrictions........


but the main thing at that point is going to be building a badass car to put that engine into.

Orr89RocZ

iTrader: (20)

Twin 76's will be enough for 7's. How much power and how fast you wish to go? X275 was already running 7's with limited turbo.

I think 72's would be more than enough. 88's would be hard to spool. Guys run twin 88's on 550+ inch big blocks into the 6's.
Single 88 i dont think would be enough for the cubes. 91-94 mm or so would match better imo

I plan to be into the 8's with 70's. Guy on turboforums went 8.6's in the 160's with afr 235's and twin mp 70's. At 3700+ lbs. Switched to 76's and didnt seem to gain much. If i recall right. Mph well tho.

project89

iTrader: (1)

i grew up building cars with dana 60's there stroing , we never had one break so it was a natural choice fo rme to put one under the car

im a lil stuck suspension wise but ive got most of the car figured out picked up a tubing bender and a boat load of tubing to start the 25.x cage , the engine was damn expsensive and its not even complete yet , cringing a lil bit at what the rest of the car is going to cost lol

well the engine is built to handle whatever i can throw at it so i dont want to under power it u could say , i want a nice good comprimise between max power and still being able to street drive it . im willing to trade off a lil lag for some good power , but i still want it fun to street drive under normal conditions

Orr89RocZ

iTrader: (20)

You will need to have alot of converter for big turbo and that will make it abit laggy on street. Well maybe not laggy but rather soft/sluggish driving around. My car isnt bad but converter isnt enough for the turbo .96 a/r. But being tight it drives really nice. You can spool twin 76's depending on the housing, but with the heads that big it will want to make power to 7k rpm. Cubes being that big will have alot of exhaust flow so it will need large turbine side which will push spool to around 4500 rpm or higher depending. Mine is about 3800-4000 with ptrims. For a 76mm wheel i would definately go alot larger than 64/74mm turbine p tims haha. Something around 70's mm would be a better match like the turbonetics 7672 or so turbos.

Good news is with huge power you get huge mph traps and thus can use less gear ratio. 3.08-3.42's on street with 28" tire will drive nicely! Like my 3.42's with 27.4" tires. And off boost the converter will act a lot tighter so you will have streetability.

Just at the strip if you have to stage and get on the tbrake very quickly before green light you wont have alot of time to get turbos spooling up and it will be lazy. Alittle smaller turbo with quicker spool will help get engine under boost quicker off the start. Quicker ets

Some of those new billet cut wheels around 70-72mm can flow like older 76-80mm's so you get best of both worlds, power and spool time.

FSTFBDY

iTrader: (33)

I wonder how two of the new mid frame turbonetics would do.
78mm compressor wheel, 75mm turbine wheel, 1.15 a/r or the .96 a/r housing for better street manners.

I kinda wish I would have waited for the 78/75 to come out vs getting my TC78 now.

project89

iTrader: (1)

im wondering since i havent ordered my heads yet if i would be better off going with the smaller head the 235's

when i originally planned the engine i was going to go with 434 cubes but later decided to get the shorter stroke crank


after the holidays ill have to contact turbonetics and see what they recomend turbo wise

its a shame i cant use a pair of tv7512's 76mm compressors with 81mm turbines except they are large frame t6's with .96 housings i could pick up the pair for about 600 bucks

Orr89RocZ

iTrader: (20)

If you have 427 inches, you will use up the 245 heads easily. I got 245's on my 406 and it definately is torquey off boost, i didnt expect it to drive that well. It felt just as peppy as the 195 heads and smaller cam. Power band was definately moved up higher but wasnt a slug.

Twin 78's would be worth 1500 whp or more. I have heard 800 whp on singles

DIGGLER

iTrader: (1)

pair of 88's and spray it to get it spooled. lol

project89

iTrader: (1)

no nitrous its about a 200 mile drive just to get the bottle filled

project89

iTrader: (1)

i didnt relize u had the 245's on ur engine , i do rember u telling me to go with the large heads that they flow well enpough to not be a dog down low

im trying to finish up geting the 4-71 blower on the v6 so i can sell off the blower kit and make some spare cash i took a nice hit for xmas only reason i havent ordered the heads yet

im just hoping i dont like the blown v6 to much or i may want to keep it

mw66nova

iTrader: (13)

are there pics of this elusive 4-71 blown 3.4 floating around?

project89

iTrader: (1)

some pics in poweradder section nothing with it on he engine yet though, i think i do have some of the mockup i can post though. after new years im taking the manifold parts upto a machine shop and there going to tig weld it all together for me since i dont have a machine capable of welding 1/4 to 1/2 inch aluminum plate .

once i get that back ill have lots of pics of the blower on the mockup engine