OMG!! Not another "what turbo" thread...
OMG!! Not another "what turbo" thread... Hi guys...just wanting to get everyone's opinion about my turbo selection.
First, I'll give you the run down...car is an '04 GTO, motor will be a forged 346 w/a built set of 6.0 liter heads. I'd love to make around 800 whp.
Current set up is a bone stock motor with a pair of GT3071R T25 turbos...car made 510/570 on 93/meth, but those small turbines put a cork in it just north of 5000 rpm...power falls off sharply up top. I've since gotten rid of the smaller turbos and now I'm in the market for something with higher flow capabilities.
I honestly don't think I'll be able to fit a pair of full T4 turbos and still retain all of my factory accesories (something that's important to me) so it looks like T3/T4's are my only options. I've got my sights set on a pair of Precision SC61's but am also considering the SC63. My only concern would be compressor surge with the higher flowing '63...heck I'm not even sure if the '61 would be immune to it with the T3 housings?
So, what do you guys think a pair of T3 flanged units could flow on a 346...perhaps there are some of you here with a similar set up...do you think my horsepower goals are out of reach?
Thanks, guys!
First, I'll give you the run down...car is an '04 GTO, motor will be a forged 346 w/a built set of 6.0 liter heads. I'd love to make around 800 whp.
Current set up is a bone stock motor with a pair of GT3071R T25 turbos...car made 510/570 on 93/meth, but those small turbines put a cork in it just north of 5000 rpm...power falls off sharply up top. I've since gotten rid of the smaller turbos and now I'm in the market for something with higher flow capabilities.
I honestly don't think I'll be able to fit a pair of full T4 turbos and still retain all of my factory accesories (something that's important to me) so it looks like T3/T4's are my only options. I've got my sights set on a pair of Precision SC61's but am also considering the SC63. My only concern would be compressor surge with the higher flowing '63...heck I'm not even sure if the '61 would be immune to it with the T3 housings?
So, what do you guys think a pair of T3 flanged units could flow on a 346...perhaps there are some of you here with a similar set up...do you think my horsepower goals are out of reach?
Thanks, guys!
Twin 91's 
.
IF you go SC61's go with the P-trim since you are sticking with the T3's. You need to stuff the largest wheel you can in there with that flange. Stay away from the stage wheels..
JZ
. IF you go SC61's go with the P-trim since you are sticking with the T3's. You need to stuff the largest wheel you can in there with that flange. Stay away from the stage wheels..
JZ
Somethings wrong with the set-up if you maxed out at 510rwhp with GT3071R's.....I'd recheck it before tearing it apart...LPE is making 850rwhp with those turbos....making 750rwhp with the smaller GT28R's...both with 346ci/mn6 and 16-18psi.
Originally Posted by onfire
Somethings wrong with the set-up if you maxed out at 510rwhp with GT3071R's.....I'd recheck it before tearing it apart...LPE is making 850rwhp with those turbos....making 750rwhp with the smaller GT28R's...both with 346ci/mn6 and 16-18psi.
Originally Posted by JZ 97 SS 1500
Twin 91's .
IF you go SC61's go with the P-trim since you are sticking with the T3's. You need to stuff the largest wheel you can in there with that flange. Stay away from the stage wheels..
JZ
. IF you go SC61's go with the P-trim since you are sticking with the T3's. You need to stuff the largest wheel you can in there with that flange. Stay away from the stage wheels..
JZ
I have'nt made my mind up yet as to which turbo's to get, it's still kind of up in the air, but I want whatever I choose to work this time, well at least for a little while.
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Joined: Feb 2005
Posts: 40
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From: Mooresville, NC and Lake Mary, FL
We're at 550rwhp on a pair of gt2871r (.86 A/R T25/28 turbine housing) at only 9psi currently on an automatic '05 LS2 SSR we built. As soon as we screw with the tuning and boost some more I'm sure we'll see in excess of 650whp with the auto tranny at around 13 psi which will just about max out these turbos. They may reach 700whp but our target was 650 with a "HUGE" power band. Like 'Onfire' said, it's not the turbos holding it back.
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I think zombie is right on this one. I have a couple of dyno graphs from my gto with stock valvesprings where the valves float before 5000 at 10-12 psi boost. Comp 918's did the trick, but I don't know how high they will go when I up the boost more.
I appreciate all of the help, the motor is all stock and the valve float was probably the issue, but I went ahead and ordered a pair of MP T-70's I think they will be better for me in the long run.
I think they will make more power effciently-we'll see
I think they will make more power effciently-we'll see
