need some help with picking a turbo for a 418ci
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Teching In
Joined: Feb 2010
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need some help with picking a turbo for a 418ci I have a 98 trans am I just got done with the motor for it. Its a Iron block 6.0 motor at 418ci. with a eagle rotating assembly with 8.5 pistons. slp L92 heads and L76 intake. I would like to run a single rear mount turbo. also im not sure of the cam i need to run. Its a 6 speed car i am going to be running it on the street. I have the ford 9in on the way with a 3.40 gear and a full suspension kit and a 6 point cage, also a transmission kit to upgrade the t56 speed. I am looking for a size of a turbo that will work best for me. Not to be a dick but if u think u know what your talking about please dont post on this thread i need help from people that know their ****. Thanks
Are you saying your pistons have an 8.5cc dish or that you are at 8.5:1 compression? That being said what is your compression? For a rear mount deal I would look at a Turbonetics TC78 or T78 with a .96 or 1.15AR for up to 700-800rwhp. If you want 800+ rwhp I would look at a Borg Warner s475-s480. As far as a cam goes get with Ed Curtis, Speed Inc, Virginia Speed, or Mark at Bullet Racing Cams.
Those components might not work all that well together. Big ci motor is going to require something with a decently large turbine. A rear mount setup will help you as far as backpressure goes but it's also going to hurt in the lag department. If you were an auto, it'd be much easier. Or if you were going front mount, it'd be much easier.
That said, a TC will probably top out around 700hp, but spool would be ok. If you want more than that, I'd look into a PT88. The BW units can make a ton of power but their hotside is pretty large. You'd probably want to run a spool valve on anything larger than a TC.
That said, a TC will probably top out around 700hp, but spool would be ok. If you want more than that, I'd look into a PT88. The BW units can make a ton of power but their hotside is pretty large. You'd probably want to run a spool valve on anything larger than a TC.
Not to be a dick, but why are you posting on a public board if you don't want public opinion? If you want expert advice, call one of the well respected turbo vendors on the board and talk to them. LMR, Virginia speed, W2W, Speed Inc, take your pic.
