nofxgivn

iTrader: (1)

I am pondering back and forth from doing a set of twins over a single.the car is a first gen Camaro with a 410 LS.weight of car will be 3500ish and race at about 6500da.i am shooting for 8.5 ish but happy with a 8.8et.i will be using a glide and a 3.30 gear.i don't need it to run 8s all the time but mid to low 9s all the time safely would be nice.i plan to use a2a and 91 pump with meth for street driving and race gas and meth for high boost levels.i would hope the motor na would make 400 to 450 hp.i would like to make 750-800 on 10-12 lbs of boost and maybe 1000 at 20.does this sound about right.im looking for real world experience.i know some people are running low 8s with less motor and a 76 turbo but I figured I would up the cubic inch and if it makes good power on lower boost then that would be fantastic.what are some thoughts.this will be done on a 275 radial.thanks in advance.

Busted67

iTrader: (1)

Having a first gen also my vote goes to twins. 63/66 mm should reach your goal for high 8's but doing it on 10-12 lbs might not happen. Unless n/a you making over 500hp.

Kmspeedie

iTrader: (1)

i say one badass single... huge turbos look badass anyways

scottywheels

I run 1 GTX5518R and have been 5.40 on 12.8 lbs

Orr89rocz

iTrader: (13)

What can you package in the bay? Twins can be easier to place. And could be cheaper if you use a budget small turbo.

Big single 80-88 mm can be 2000-2500$ depending. Borg unit may work ok for less money. My buddys 408 ran strong with s500-88 cast. Its a big turbo tho, large and heavy. Been 8.3's and his 91mm version has been 8.03 178 on 22 ish lbs e85 car

Forcefed86

iTrader: (4)

Twins are always more efficient than a big single. Packaging is also much easier IMO. Who wants to route a 6" downpipe? PT76/75's or a GT4202 get my vote. They are also small physically compared to the BW stuff.

Your power numbers are off a bit. Best any system will do is double the NA hp at around 15psi...thats at the crank. So if you're making 450 crank hp. You'll make around 900 at 15-16lbs...

Come on now that's not fair... Whats that thing make on motor 650...700?

97WS6SCharged

iTrader: (1)

No hard data yet other than "what it should do" under boost so take this with a grain of salt but I have a 408 that I built for mile racing. Currently it makes 470 whp NA through a 6 speed and 10 bolt in my Camaro. Probably make 30-40 hp less in my TA with a 4L80 and 9".

Anyhow, I went with a pair of Precision 6766s w/billet wheels and .81 housings. I'm hoping to finally nose over 200 mph in the standing mile with a full weight car (other than a few light weight suspension pieces). If Precision's claims are correct they will supposedly move enough air to support 1800 hp which might not be enough in the long run.

nofxgivn

iTrader: (1)

I may try the borg s366s 73 88 and see how they do.i was kicking around a billet wheel option but have not got a price on such animal yet.1000-1100 should be all I need to push my 3700lb pig into the 8s.i will keep looking at my options before I move forward.

stevieturbo

As long as they hold together, those should easily allow you to see well over 200mph in a mile.

The 67's are a good size for what you have and the goals, you could maybe even step up to larger turbine housings.

slowlsx

iTrader: (28)

picked these babies up for less than $1700 these are the new billet s366 SX-E turbos with 79x73 turbine wheels .91 divided housings. these flow 93lb/m so that should be good for around 1800hp? pretty dam good price for that much power capability. i would compare these to the Precision 6766 although those are about $1000 more than these.

stevieturbo

Looks like a great purchase !

slowlsx

iTrader: (28)

Yea I originally had a billet GT5588 but with the money I sold that for I got both of these turbos, two turbosmart gates and a 64mm Precision BOV. These turbos should make about they same power as the 88 and hopefully spool quicker. Not to mention cool factor.

97WS6SCharged

iTrader: (1)

For what they cost they had better hold together. These aren't the entry level ones that most people have issues with so I'm not too worried. Plus I've been a good customer and friend of the guys who sold them to me for years and they are a Precision dealer. Either way, they'll take care of me.

Oh, the reason I didn't go bigger was for space. I'm planning to recreate Boosst's build with a pair of LS3 manifolds and mount them low. I think I finally have enough parts, just have to get to fabbing stuff now.

stevieturbo

I see Precision have a new 6870...that looks pretty cool.