68mm s300 turbine limits

R

rham45

New member
Well looks like I may actually try a set of compounds for a while. I kinda got out of diesels for a while but that is gonna change. My main concern is at what hp is the 68mm s300 turbine wheel a bottleneck. I'm probably over thinking things like usual. I'd like to make close to 900 hp and drive it on the street. I have a better engine being built so I'll probably push it hard.

As the truck sits now with a pretty fresh motor it has
Standard bore ho pistons for a little extra compression.
Arp 425 head studs.
Arp main studs and rod bolts.
Shot peened 12v rods and balanced bottom end.
Hamilton 182/214 camshaft. They no longer make this.
Hamilton springs and push rods.
7x.010 injectors that are temporary.
Benched Farrell diesel 215 pump. 4ks, despite, benched at 510cc.
Fass 220.
S366/73/14 sxe.
Rkl diesel out of Springville UT built the trans
Dpc 4 disc convertor. 2500 stall. I originally wanted to run a big single.
Billet input and output
 
I have a set of source automotive s300/400 compound piping that I've had forever. I also have a s300 turbine housing for the 68mm turbine wheel. So I'm thinking about using. I have a s485 too but that's overkill until I get the new engine. I also live at 4500' elevation. I originally going to run a big single like I have in the past with a Crazy Carl's supercharger that I bought. I changed my mind though. So this is what I'm thinking

06 commonrail head. I already have this. It's just getting finished. Everything is fresh. Cr head flows better than vp so that should help. Slight porting on exhaust side. It already has a B&B Tooling ppump 24v intake manifold and orings. I'm debating on having the rest of it ported as well.
Monster Pump Mike cr swap crossover tubes. I have these already.
I'm going to get another set of 6x.016, 8x.012, 7x.014s, or equivalent injectors from DAP or Weston.
I'm thinking a 63/68/14 or 64.5/68/14 t3 secondary unless I need a bigger turbine. If I have to I'll
Forced inductions s476-480/96/1.10 t6 for a primary.
If I need more fuel I have a set of 7mm +100 cc delivery valves, pdd 5x.022 injectors, and a R&D Fuel Injection 13mm benched at 990cc but I doubt I need more fuel. I'm planning on going alot bigger when I get the new engine in the future.
Any suggestions go ahead and say them.
 
I had a 62/68 0.7AR manifold and 88/96/1.32 primary on my 12v, Spool was super fast. Completely melted down the 68 turbine and housing at around 700hp. I melted it down at the drag strip on a 1/4 mile pass. It would have probably been fine with more mild street driving.
 
Vincejax said:
I had a 62/68 0.7AR manifold and 88/96/1.32 primary on my 12v, Spool was super fast. Completely melted down the 68 turbine and housing at around 700hp. I melted it down at the drag strip on a 1/4 mile pass. It would have probably been fine with more mild street driving.
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Did it get hot quick? How were your egts driving around town?
 
rham45 said:
Did it get hot quick? How were your egts driving around town?
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I have a 13mm pump and set to 600cc it would peg the EGT gauge at 1600 in 4-6 seconds if I went WOT. But realistically driving around town it was fine. It is in a small truck scsb, never towed with it. Spoolup was awesome. Now I have a 72/87 0.9 on the manifold and the party starts around 2500rpm :tree:
 
Vincejax said:
I have a 13mm pump and set to 600cc it would peg the EGT gauge at 1600 in 4-6 seconds if I went WOT. But realistically driving around town it was fine. It is in a small truck scsb, never towed with it. Spoolup was awesome. Now I have a 72/87 0.9 on the manifold and the party starts around 2500rpm :tree:
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Which setup was more fun all the way around? Do you think 62/68/.8 would be better and make 800 hp in compounds?
 
rham45 said:
Which setup was more fun all the way around? Do you think 62/68/.8 would be better and make 800 hp in compounds?
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For street driving the small manifold turbo was much more fun. imo 800 is way too much for the 62/68 .8 Will melt it down most likely.
 
If you run a gated housing along with the 68mm turbine in compounds, I think you'll be fine.

Just do a couple pulls and see what the drive pressure is, that's more important than egts from my experience.
 
jasonc said:
You were doing fine until you compounded that little charger with the 88mm, ha.
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True, but pump was only at 600cc. When I had the 75/96/1.32 it topped out around 700hp is my guess. Maybe little higher. He didnt say what he planned to compound it with.
 
I haven't fully decided on that. Originally I was going to use a Fi s480/96/1.1 t6 but I've kind of been thinking maybe a s485.
 
We recently had a 98 12v dually on the dyno, long time customer that comes around once a year or so for upgrades. His truck was originally built to haul his 5th wheel, but still capable of being a hotrod when empty. 362sxe (68mm turbine) T3 .70ar internal gate compounded with a 476sxe 87 turbine T4 1.25. Here at altitude with the stock 12v head it makes 80+ psi on the dyno and a solid mid 800 rwhp setup fuel-only. We added a Stage 1 PDD ported 12v head and it's now a solid 900+ rwhp truck fuel-only.

If you asked me 2 years ago if a 362sxe internally gated T3 over 476sxe T4 setup was capable of 900 HP on a 12v, I would have said no. Lucky for you and me I was wrong and the 68mm turbine still has room to flow... We filmed a YouTube video with all the details and it should be uploaded later this week. We instrumented the truck with live sensors for boost and drive pressure for the before and after test on the cylinder head change so those numbers are all beautifully overlaid on the dyno chart.

As far as common rail 24v heads flowing a lot more than 24v VP44 heads, as the owner and regular operator of a modern SuperFlow flow bench, I can say that I have not seen a large difference in the 3 or 4 OEM heads I have put on the bench. Without stating exact numbers (maybe 10 CFM difference) and starting some flowbench war, there's a much larger difference in head flow when equipped with OEM vs aftermarket exhaust manifolds(20 to 40 CFM) than there is between VP heads, 5.9L CR heads, and 6.7L heads.
 
[ame="http://www.youtube.com/watch?v=4YfAJZVXCl4"]Stock Head vs PDD Stage 1 Ported Head - YouTube[/ame]
 
rham45 said:
What kinda of fueling did the truck have Will?
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This truck has a Seth Farrell 650 cc 215 pump, and it was dyno'd with full fuel. The injectors are the new DDP Stage 4's that have 5 standard 0.013" orifices with 5 micro 0.004" orifices in-between.
 
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