Elites HO vs RCD 68

[kingranchstroker]

Ive been looking into getting a 68 vgt recently. Im running a batmo powermax now with 190/100s and it does well but im still hungry for more... So i would like to hear peoples opinions on what they have experienced with 190s and the 68s

 

[MorganY]

http://powerstrokearmy.com/forums/showthread.php?t=15422

 

[Redneck6.0L]

Don't quate me on this but I think elite puts a larger exhaust wheel in there ho where rcd only mods the intake side. If you don't care about towing. I'd go HO. They've proven to make the best HP of any vgt so far. Still doesn't mean I like vgts LOL

 

[windrunner408]

Would the HO produce less back pressure than the 68mm PM because of the larger turbine wheel?? Or would it not make any difference??

 

[faster6.0]

Larger turbine wheel makes all the difference in the world. More free flowing exhaust means more potential power/less back pressure.

 

[kyle43335]

fyi,just for refrence the 64/71.70 t3 open we bought from younger went on a f-550 with my old 205 50%.

that charger runs a perfect 1:1 at wot. tuned for full tilt.

 

[strokin6L]

My current 64/71/70 T3 open non vgt will hold 1:1 all the way to around 40psi then back pressure starts to rise a bit over the boost. When i dyno'd...boost was about 45psi and BP was around 53-54psi with 190/75's.

 

[windrunner408]

Well VGT turbos will probably not ever be able to be ran at anything close to 1:1 at WOT. What is the general consensus on how much pressure (boost or back pressure) our engines can take when studded before the gaskets will give out.

 

[BlueWaffle]

assuming the turbine side stays the same as the pmax on the 68...its 72.5/66.5 inducer/exducer. HO is 72.5/70. I'm still trying to find out the specs on both the compressor and turbine side of the 68. on the RCD website, it says the 68 has an enlarged turbine side as well so I'm trying to clarify that.

and bp will always be higher with a VGT will it not (i.e. not close to 1:1) ??

 

[kyle43335]

assuming the turbine side stays the same as the pmax on the 68...its 72.5/66.5 inducer/exducer. HO is 72.5/70. I'm still trying to find out the specs on both the compressor and turbine side of the 68. on the RCD website, it says the 68 has an enlarged turbine side as well so I'm trying to clarify that.

and bp will always be higher with a VGT will it not (i.e. not close to 1:1) ??

correct.

the whole point to the vgt,is that even at low rpm,the veins are closed creating a dam effect to bump the pressure.

then at higher rpms the veins are now open to allow flow(engine has much better exhaust pulse),problem is now the veins become a restriction.

i have datalogged bone stock trucks ratios,and this is what ive seen...

the charger upon building boost will rise around 2:1 ratio under moderate to heavy throttle, once max boost is achieved the ratio comes in around 1.25-1.50:1

keep in mind bone stock truck

once you tune the same platform,those numbers go up...

hope this helps

 

[BlueWaffle]

correct.

the whole point to the vgt,is that even at low rpm,the veins are closed creating a dam effect to bump the pressure.

then at higher rpms the veins are now open to allow flow(engine has much better exhaust pulse),problem is now the veins become a restriction.

i have datalogged bone stock trucks ratios,and this is what ive seen...

the charger upon building boost will rise around 2:1 ratio under moderate to heavy throttle, once max boost is achieved the ratio comes in around 1.25-1.50:1

keep in mind bone stock truck

once you tune the same platform,those numbers go up...

hope this helps

right...i think people will get scared off with high BP #'s because they hear all about 1:1 stuff with non vgt but that's the nature of the VGT. I am curious what the limit is to keep hg's in place though

 

[kyle43335]

right...i think people will get scared off with high BP #'s because they hear all about 1:1 stuff with non vgt but that's the nature of the VGT. I am curious what the limit is to keep hg's in place though

that mysterious number? lol

just for the record my blue truck has seen close to a year of non vgt duty,with drive pressures in check.

countless wot 30-35 psi runs.(stock injectors) it pulls harder than any vgt hot tuned stock truck ive driven,it also runs cooler than with a vgt.

this is all on a 154,000 mile engine.stock head bolts and gaskets engine.

makes you think doesnt it?

 

[BlueWaffle]

that mysterious number? lol

just for the record my blue truck has seen close to a year of non vgt duty,with drive pressures in check.

countless wot 30-35 psi runs.(stock injectors) it pulls harder than any vgt hot tuned stock truck ive driven,it also runs cooler than with a vgt.

this is all on a 154,000 mile engine.stock head bolts and gaskets engine.

makes you think doesnt it?

are you comparing a stock vgt and aftermarket non vgt? if so....of course it's going to pull harder and run cooler than the vgt.

either way...there's no arguing that bp is going to be much more manageable with a non vgt. :thumbsup:



anyways....back on topic.

 

[kingranchstroker]

Yeah I tow a boat once a weekend in the summer that's5k but that's about it . Im liking the fact that elites will have less bp because of the enlarged turbine. Now does the ho have a cast or billet compressor wheel ?

 

[kyle43335]

are you comparing a stock vgt and aftermarket non vgt? if so....of course it's going to pull harder and run cooler than the vgt.

either way...there's no arguing that bp is going to be much more manageable with a non vgt. :thumbsup:



anyways....back on topic.

im comparing vgt to non vgt. they bolth have their own pro v cons.

 

[Lubbockguy1979]

What kind of hp gains are you going to see from a pm with batmo wheel vs. Rcd68pm vs. The ho?... It would suck to drop some coin for small gains in my opinion

 

[BlueWaffle]

I'd think HO and RCD will be in the same neighborhood. I'll have track times and maybe a dyno pull this weekend in ennis to see what gains the 68 has over the pmax. sure feels stronger!

 

[Lubbockguy1979]

I'd think HO and RCD will be in the same neighborhood. I'll have track times and maybe a dyno pull this weekend in ennis to see what gains the 68 has over the pmax. sure feels stronger!

Look forward to seeing it run in person.

 

[strokin6L]

lookin forward to hear the dyno and strip results on your setup Lance!

 

[Breaking Habits]

Lance,
Get to play with Race/lope yet?

Jared