baronsmith98

iTrader: (2)

Hey guys I'm running the motor in my sig in a 92 reg cab Sierra on nitrous and it runs pretty good. But with the nitrous shortage it's getting STUPID expensive! Went from $3.80/lb to $8/lb. so I'm looking at possibly making the switch.

My motor is setup for carb and 10.6:1 compression so I was thinking about going e85 with a CSU carb setup from Kevin. Probably run an intercooler too. I know my cam is probably not ideal but I was just gonna run it for now. I've been looking at 2 turbos a s475 96mm with a 1.32 ar and an s475 83mm with a 1.10 ar. Would run flipped truck manifolds with a 2 1/4" crossover. Would a 44mm waste gate be able to control this? Looking to make 7-10 psi to start with. I can still leave my nitrous system in to help spool if y'all think the 96mm will be laggy. I have a th350 in the truck with a 3,800 stall for now which is why I want to run low boost until I can put a th400 in it. Ford 9" 3.89 gears. Looking for any opinions on this setup as far as compression and e85 and turbo selection. Thanks

truckdoug

iTrader: (26)

yeah that gate would work fine if you position it properly

them gears are really short for a turbo rig. i'd look at swaping in some low 3.xx unless you have really tall tires

thats about all I can offer.

baronsmith98

iTrader: (2)

I'm running a 28" tire right now. Would a 2.5" crossover be better?

JoeNova

I had a billet S475 with a 87mm 1.10 AR T4 and it was impossible to control on the street. Boost came in very hard with 2.25" crossover and it would melt the ET Pros. With the right cam and converter, you'll be fine.

baronsmith98

iTrader: (2)

Do you think my cam and converter would work ok for the time being?

truckdoug

iTrader: (26)

well it might not be ideal, but it's together and running so dont **** with it. the higher CR and more duration that a typical turbo build might work out okay.

work out the install and change parts out later.

with a 28" tall tire you will want taller gears to make that motor work and spool the turbo

i have 3.50's and 28" tires and will be moving to 3.00 as soon as some other things are completed

1CAMWNDR

iTrader: (21)

Leave the gear ratio alone. You need the leverage to get the weight moving and use rpm to spin the turbo. The whole taller gears to "Load" the turbo mentality does not usually work REALLY well. And a 3.00 gear in a truck with a 2.42 first gear is gonna be a slouch.

forcd ind

iTrader: (7)

I had a 93mm turbine, 1.25 AR on my s475 and changed it to
a 1.00 AR to help it spool-I am kind of thinking you may have
trouble spooling down low with the 96 1.32-i guess it depends
on your max RPM.

baronsmith98

iTrader: (2)

I'm going to turn it to just under 7K. I figured if it was a little laggy I could use my nitrous system to spool it. I figured a small shot then ramping it out quickly would use a lot less nitrous than I am now. But that is only if I NEED it.