64/71 vs 66/73

Wouldn't I have surging issues around half throttle if I went to a 72/83? Even with a spool valve

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feller said:
Wouldn't I have surging issues around half throttle if I went to a 72/83? Even with a spool valve

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If 600hp is the goal a 72 is way oversized. That's more like 800hp territory
 
Like Ghost stated, I just went to a good running set of compounds(62/65/12 over HT3B/26) to a S464 with Billet comp wheel. The turbine in the 464 is a 83/74 as where the turbine in the 366 is a 80/73(just something I should point out). I noticed that all the s400's use the inducer when talking about turbine wheels and the s300's seem to use the exducer numbers. Back on topic, I switched chargers because it was time for a change and I needed money in my pockets, but honestly it builds boost better than I thought it would. I Am running a 150rpm lower that stock stall converter and can start building boost at 1300rpm in second gear. getting up too highway speeds i will have 8-15psi of boost depending on how im driving. I tend to give it more throttle so Lock-up isnt licking in at 42mph, but instead 55mph. Now its not like the compounds, but I wouldn't hesitate to run the 467 after seeing the results I have.

Now, I kinda have to agree with the 66/73/.83T4, the turbine is smaller and lighter so it should spool decent. You may even try running it with out the external gate to see what it will do, as in you can keep you foot out of it until you get everything.

Also if your going to be running a T4 housing, run a T4 manifold I wouldn't use an adapter.
 
The T4 manifold is out of the question because of its costs. The reason I am upgrading turbos in the first place is because to clear shocks that are 5" taller than stock and 4" in diameter. So I have to flip the manifold and I figured if I have to buy all new piping for the boost tube/ down pipe I might as well buy a new turbo. I was going to run at biggest 63/68/.85 and push for 500 HP, now my tranny is built to hold 800hp so I'm shooting for 6-650hp.

2 days ago I read a 22 page thread on turbine diverter valves and they have caught my attention so I started looking at larger chargers and for a 66/73, spool flange, dwnpipe and boost tube should put me around 1300 total investment.

If I were to run a 467, it would perform alot better, but it would be a 1900 investment.

If I were to run a 66/73/.83 I would have to either buy a manifold with an external waste gate port or buy a T3-T4 adapter with an external waste gate port and then buy an external wastegate port. Total investment would be around 2k.

It just seems that the 66/73 + spool flange is the best bang for the buck.

I'm still undecided about which exhaust housing, afraid the .83 would make more than 60 pounds of boost (trying to avoid that) or that the .91 wouldn't make enough boost and would run too hot.

What you guys think?

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I'd find a good used 64/71/14 and call it a day. $900-1100 and it will support 600hp with the right combination pretty easy. Has an internal gate and a T3 housing so it's about as easy as it gets
 
feller said:
Murphy if I were to do an external waste gate I would have to either buy a different manifold or run a spacer with a port for an external Watergate then I'd actually have to buy the external waste gate.

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An external gate set-up is still gonna be cheaper than a diverter valve which retail for $600-$700. But if we're being completely honest, I think you might be over thinkin this whole diverter valve thing. There is no reason like stated above a basic used 66/71/14 wouldn't do justice for what your looking to do.
 
I think a diverter valve is the only thing that is going to make a single capable of supporting 600hp spool like stock... A cam + install cost too much and porting&polishing is way out of the question.

Don't 66/71 combo surge a lot?

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S467.......................$1250
T3 to T4 w/WG flange$175
JGS 40mm WG...........$265
TOTAL.....................$1690
Then add a little more for intercooler pipe, downpipe, etc
 
At what HP level would a .83 non gated housing start to build excessive drive pressure? I thinking of trying the 66/73 with the .83 housing and running a spool flange just to guarantee fast spool.

Also wondering if it would be best to just run a 63/68/.85 and HOPE for 500hp but I wouldn't have to deal with a spool flange and I would have decent spool...

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I don't drag race or pull so this essentially needs to spool like stock.

Its basically a play truck that needs an extra few hundred HP to match the current suspension, my hx35 @35psi runs WAY too hot but spools pretty good. I don't sit with my foot on the throttle waiting to build boost before I drive the truck, I need it to spool like stock or else I would have to switch to a smaller turbo

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There is no reason that a 63/68/.85 shouldn't do 500hp. We don't even know whats done to the truck? Injectors? Trans? Converter Stall? Rearend gear? Tires size? These things all effect spool.
 
Sorry I haven't had time to sit at a computer and do my signature.

So far:
Stock 160 injectors
Stock 131 delivery valves
4k gsk
60# valve springs
No plate
Grinded AFC washer
20* timing
Mack plug
TorkTek adj. OFV @45psi WOT
Headstuds @135Ibs
3 piece T3 manifold
4.10 gears
37" tires
Built 47rh w/billet input
ATS 5 star converter, I believe 1700rpm stall
Gauges

Future:
Benched pump
025 delivery valves
7x11 injectors
ARP 425s
Holley pusher pump
1/2" lines & sump (maybe)


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I say go for a 63/68/0.91 T-4. Install the spacer with the waste gate and just put a block off plate for now. That probably be the fastest, cheapest way to 500+HP. Use a plate to limit boost, you will need injectors, probably some 5x12 or 5x14. Later on when you get some extra cash, put a waste gate on and let her eat. Also a good setup for big twins later if you desired or a bigger single if you desired. Nothing is going to spool like a hx35 will except for maybe twins. You will have to live with that decision.
 
I fear a .91 exhaust housing on any turbo is going to be too much lag, I don't want to run a waste gate unless its 100% absolutely necessary because of the extra cost... Also I cannot run twins because of their weight & fitting issues. They would have to be next to each other and then I would just be waiting until the primary falls off.

What's wrong with a 66/73/.83+ a spool valve? Should spool extremely fast becuae of the housing & spool valve, I'm just worried the .83 wouldn't do so well without a wastegate

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Ok fine. Lemme tell you what you want. Borg Warner EFR 62/68. FMW 62 wheel. Ball bearing. Titanium alloy turbine wheel. Kicka$$ wastegated housing. All for under $2k. Argue with that!!! Jeez

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