S480 big enough to be used as big turbo for compounds?

MadDiesel73

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Getting together stuff to do a compound setup. Im looking for the right turbo to use with my 38r. i want to stay around $1200 which limits the choices. i found a s480 with race cover for $900 my other option im interested in is the forced inductions garrett gt88 or gt91. there about $1300-1400 anyone know anything about these?

Other stuff on my list
upgrade to 200% nozzles (250/200) or 300/200
stealth srp1
set of ported heads that dont smoke like a train
 
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Short Bus

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I have seen "race cover" talked about before, but what does that mean? I'd think an s480 would be on the smallish side, i'd try and find an 88mm since thats what several others are running with good results.
 

SledYanker

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I have seen "race cover" talked about before, but what does that mean? I'd think an s480 would be on the smallish side, i'd try and find an 88mm since thats what several others are running with good results.

Not with them little sticks... Even with what the OP has "talked" about going to later down the road.

Or am I way off?
 

ITUKMOR

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I would recommend going with a 400% nozzle if you are serious about twins. The flow rate of the 200% will spool the setup most likely but for it to be snappy like twins should be, you are gonna need an aggressive fueling rate. You can always pull back fuel with tuning but you can't make it come on faster than it is capable. An S475 or S480 is gonna be pretty small in combo w/ a 38r. Most setups w/ a 38r are running 90mm or larger chargers. For example, we run 74/88, 80/88, & 82/88 as singles w/ 400/400% on trucks that are driven daily on the street. I am sure Charles could help you out if you asked him.
 
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MadDiesel73

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you might run 82/88 as a single w/ 400/400% on the street in TN but i would goto jail here (baltimore MD) lol. j/k but im looking for the cleanest 600-650hp 100% street combo possible.. which from others accounts its possible with 200% nozzles. the biggest i could imagine going would be 300%. but with 200% nozzles thats why i was thinking s480.. i may be way off ive just started doing my research into compounds.
 

ITUKMOR

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The S480 will get you to where you want to be (600-650) with no issues. The 200% nozzle might get it done but I would say more like 575-600. How well the setup works is going to be really determined by tuning and control of the wastegate(s). BTW, I have a customer in MO that is running our 74/88 S4 as a single with 300/200% on the street. He dynoed right over 600hp. Now that charger is a bit laggy with 200% but it is doable. I think you are on the right track just going to have to be creative with controlling drive pressure/boost.
 

MadDiesel73

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Trying to figure out how the wastegates are going to be done. i now have the 1.0wg housing on the 38r. can i keep that do do i need to get the 1.15/1.0/.84 non wg housing and a tial gate. what size tial style wastegate would i need for big and little turbo? i believe charles had 44's.

i still havent decided on the s480 or just go the the forced inductions gt88 pr gt91 im leaning toward the gt88. have to make up my mind need to order this week.

how much power you think is in a 38r/gt88 , 300/200 setup? 575-600? or more i hope..
 
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Marty

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Baltimore is not far. Come drive my 75/83 single with 400/600s. In the lowest tune it smokes no more then a 140 smoke tune on a stock truck.

Everything of mine is from swamps.

The 80mm s4 will work but will be on the smallest side. Anything in the 90+ mm range would be better.
 

Marty

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That little gate on the 38r will not work. You are going to need something 40+ dumping into the intermediate pipe.
 

MadDiesel73

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Gotcha yea I think Charles used 44's . So I need to get a 1.15 for the 38r with a 44 gate. and how about the gt91 with the ?1.28 housing or 1.08? with a 44 gate. Ive Been thinking maybe 400/300 but I want the least amount o smoke possible at this power level. But from reading Charles post in the injector thread anything can be smoke free with the right combo and tuning . I'm just concerned this is my only/work truck.
 

MadDiesel73

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what do you all think of the tial MVR or precision 46mm wastegates since the v44's are discontinued? and the mvr and precision comes with all the springs for adjustment.
 

UPINSMOKE

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what do you all think of the tial MVR or precision 46mm wastegates since the v44's are discontinued? and the mvr and precision comes with all the springs for adjustment.

Sorry to derail but who are you?? LOL

I am in dundalk and just curious if I know your truck or not.


FWIW I plan on running a compound setup on my truck with a 66 for a high pressure turbo and 95+mm atmosphere with 400/400's...

Are those gt88 or gt91 turbos you're talking about actually 88 and 91mm? Is that how they are named?
 
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MadDiesel73

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IMG_0483-1.png
 
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Dieselboy.

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Charles first set of twins used a 38/47 I believe. And I know for a fact he used 250/200s for sticks until he went to 400/400. And I think he did 600+/- on the 250s

But I will. Agree why waste the time. Just stick 400/400s in from the get go. It will be fine with a compound setup
 

MadDiesel73

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yea i think charles made 597 with the 250/200 which seems kind of low.. i mean thuglike made 63x with 300/200's and a gt42 single

then he made 644 with 300/300's? or was that with the 400/400's before he tried the gt55?

even he said 400/400 was too much fuel for the 38r/47 setup so maybe ill go 400/300 see what that does for me. i mean a clean 650 is all i can do with stock forged cryoed rods safely anyway.
 

Charles

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I ran the 88mm first stage with 238/30's at first. Worked like a charm and pulled mid 5's. The 250/200's pulled just shy of 600, but I was running very little timing compared to some of these guys pulling 600+ on that nozzle. When the nozzle is slow (comparitively) it takes a lot of timing to get the fuel in the cylinder in a decent window.

For comparison, I recall Jason telling me that Jody had his timing set at "9" degrees back in the day when he was pulling low to mid 600's on the 4202. Looking at one file I have from Jody I also know the multiplier values are throwing timing in there too. But aside from that.... just looking at a value of 9 in the sea-level/-altitude tabes would compare to a value of 3 in my own tables at a similar point for comparison. Not even counting the effect of the other tables that would be 6 degrees of timing right there. To put that in perspective, I went to the dyno one time and did nothing but add timing in 1 to 2 degree increments and at 3400rpm ~8 degrees was worth ~140rwhp that day...

Course I also lifted the heads and had to back it back down. Luckily I was running Cometics and not stock gaskets.


You can squeeze more power out of a smaller nozzle if you wish. But it starts getting pretty painful on the engine. Making the same power on a quicker nozzle, with less timing is going to be less stressful on parts. If you build it strong enough it can usually hold. But it's just easier on parts to keep the timing down instead of trying to build everything bulletproof and squeeze every last drop out of a smallish nozzle.


But as far as "spooling" a set of compounds.... forget about it. Find something else to worry about. They'll spool just fine with that 38R lighting the party. You could run stock injectors with an 88+mm first stage and have no issues whatsoever. Only problems I've ever had with spooling is keeping boost down at various times. When I first fabbed my original setup I had to add a second gate because I could not control boost. Now, with the 55 I cannot run less than 80lbs with the 38R gate wide open and the 55 only making ~20 to 25lbs.
 
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