2002 twin turbo t4 5.3
05-15-2014, 05:23 PM
#22
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05-15-2014, 05:35 PM
#23
https://ls1tech.com/forums/forced-in...-bw-s300s.html
Thats the most recent thread I could find - which has no proof, but gets to the heart of the matter.
As far as volume/choking level for a T3, I'm not sure if I'm misunderstanding the way it works - but I was pretty sure displacement gets to go out the window a little bit with regards to exhaust gas volume once in boost applications.
I thought the hp level made was a better frame of reference because it is a direct measure of fuel burn (and thus exhaust gas volume right?).
Admittedly I don't think I've seen a V8 dyno with a single T3 ever, so I can't say it isn't a restriction - I just also haven't seen a dyno....so I can't really say it is.
I know it isn't a restriction on a 3.0L engine, I've seen 750 whp at 30 psi.
Thats the most recent thread I could find - which has no proof, but gets to the heart of the matter.
As far as volume/choking level for a T3, I'm not sure if I'm misunderstanding the way it works - but I was pretty sure displacement gets to go out the window a little bit with regards to exhaust gas volume once in boost applications.
I thought the hp level made was a better frame of reference because it is a direct measure of fuel burn (and thus exhaust gas volume right?).
Admittedly I don't think I've seen a V8 dyno with a single T3 ever, so I can't say it isn't a restriction - I just also haven't seen a dyno....so I can't really say it is.
I know it isn't a restriction on a 3.0L engine, I've seen 750 whp at 30 psi.
05-15-2014, 05:57 PM
#24
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On a 5.3, each turbine is only seeing 2.65L of displacement, which is fine for a T3 turbine below 500 HP.
With that aside, I agree with you Bimmer, HP is a better frame for turbine flow since it directly relates to how much exhaust is actually being pushed through.
With that aside, I agree with you Bimmer, HP is a better frame for turbine flow since it directly relates to how much exhaust is actually being pushed through.
05-15-2014, 06:53 PM
#25
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I still don't think its going to be as bad as everyone makes it seem. Im also into the ford 2.3 and boport was running a t4 .90 ar and was hitting 24psi around 3800-4k rpms . Im not sure what size the turbine was but I still think itll be ok for a straight line vehicle.
05-16-2014, 12:01 AM
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05-24-2014, 08:14 AM
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The cheapest ive been able to find another borgwarner is 850 plus shipping. I just noticed the on3 performance 76mm turbos. I already have divided t4 flanges welded onto my manifolds so what ar would be best with those turbos? They offer 1.0 in divided forum .would this still be to much?
05-24-2014, 08:28 AM
#32
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there are a few guys on here that run twin s366's on a 5.3, and they can tell you they are a little laggy. the t4 s366 comes with a .88 undivided, or .91 divided housing. if you were going to a 6.0 or bigger, the s366's would be a better choice for twins. research on here: silver_82 stock 5.3 TT: THE GRENADE
Last edited by dmaxvaz; 05-24-2014 at 09:06 AM.
05-24-2014, 10:46 AM
#34
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The cheapest ive been able to find another borgwarner is 850 plus shipping. I just noticed the on3 performance 76mm turbos. I already have divided t4 flanges welded onto my manifolds so what ar would be best with those turbos? They offer 1.0 in divided forum .would this still be to much?
05-25-2014, 11:11 PM
#35
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Most people here run a single S475 and report fantastic results with decent spool.
Those who run twin S366's on a 5.3 often report significant lag and ultimately make less power under the curve than the single setups. Those who run the even smaller (still not small) turbos being recommended usually succeed.
I'm putting twin T3/T4 (T04b covers) turbos on, the little 58 mm turbos, and will grab some S256's down the road, but for 700 whp max I can reach my goals with about any of those (obviously a trade-off, my car is a daily so I want instant spool).
I am curious (and not to threadjack, I think its relevant) - is there a reason everyone assumes twin T4 housings are needed, or that a single T6 is? T3 housings can make over 800 whp EACH before they start to choke, I'd imagine a twin scroll T4 is a bit north of that and an open scroll significantly north.
Those who run twin S366's on a 5.3 often report significant lag and ultimately make less power under the curve than the single setups. Those who run the even smaller (still not small) turbos being recommended usually succeed.
I'm putting twin T3/T4 (T04b covers) turbos on, the little 58 mm turbos, and will grab some S256's down the road, but for 700 whp max I can reach my goals with about any of those (obviously a trade-off, my car is a daily so I want instant spool).
I am curious (and not to threadjack, I think its relevant) - is there a reason everyone assumes twin T4 housings are needed, or that a single T6 is? T3 housings can make over 800 whp EACH before they start to choke, I'd imagine a twin scroll T4 is a bit north of that and an open scroll significantly north.
06-02-2014, 09:00 AM
#37
I was hoping you'd change it to twin 88's 
Good luck, let us know how that turns. My twin 60's on my G8 spool up very quickly and is a blast to drive. My single s480 t6 on my Camaro, not as much. Definitely spools much slower, you're definitely not going to get a holeshot on the street with it, but it does feel good when it comes in. Plus, my 60's put down over 700rwhp @ 14lbs, I definitely would have suggested smaller, but to each their own.
Should at least make for an interesting thread when it's done and you're testing, maybe we'll be surprised!
Good luck, let us know how that turns. My twin 60's on my G8 spool up very quickly and is a blast to drive. My single s480 t6 on my Camaro, not as much. Definitely spools much slower, you're definitely not going to get a holeshot on the street with it, but it does feel good when it comes in. Plus, my 60's put down over 700rwhp @ 14lbs, I definitely would have suggested smaller, but to each their own.
Should at least make for an interesting thread when it's done and you're testing, maybe we'll be surprised!
06-02-2014, 09:56 AM
#38
I have since switched over to turbonetics 6665's and it's a night and day difference. 9.80@141 on 12-13lbs of boost, let out and short shifted in 1st, rest of the run was WOT. the run before it was a 10.007@134 on 10lbs short shifting at 5500 rpm.
