Triples or twins over a 72 VGT?

[Cknight199]

Well just pricing things out for a build and was thinking about twins and then thought of triples once I saw some egr results from twins on a 72 VGT. What would you use to twin over a 72mm Danville performance turbo? I've heard of an s483, but the egt's were 1500 and I was thinking triples would keep things cooler... What size triple would you go with if I was to do triples? Would I have to go with a turbo larger than my 72? Or could I get away with two 66 or 70 mm turbos?

 

[ChevyDieselLLY]

1500 isn't bad if that is maxed out at the end of the track

 

[Burn Down]

The low pressure Turbo/turbo's isn't the problem. The high pressure VVT turbo runs hotter than a fixed turbo...

And as mentioned above 1500* isn't to bad...

 

[DIESELMAFIAPER.LB7]

Id do a 483 billet twin

 

[Cknight199]

Gotcha, yea I see that already at the end of the track, but ill be using this truck to tow a snowmobile trailer in the winter as well

 

[Harbin_22]

Mark can set you up to gate the 72 too. And at least a 483 or a big Garret

 

[Burn Down]

Gotcha, yea I see that already at the end of the track, but ill be using this truck to tow a snowmobile trailer in the winter as well

You will need a smaller "tow" tune or keep a eye on egt's towing with a race tune...

I leave the race tune in my truck at all times but I don't tow ultra heavy...

 

[Cknight199]

You will need a smaller "tow" tune or keep a eye on egt's towing with a race tune...

I leave the race tune in my truck at all times but I don't tow ultra heavy...

Yea my tow tune won't go over 1350 degrees but its basically 50 hp over stock.

 

[paint94979]

Yea my tow tune won't go over 1350 degrees but its basically 50 hp over stock.

that doesn't sound right?

 

[Cknight199]

that doesn't sound right?

Or maybe it is stock lol it's my tow/Eco tune

 

[Burn Down]

Or maybe it is stock lol it's my tow/Eco tune

Do you have the 72 already?

 

[Hot COCOAL]

A Garrett gt4718r with something like a .96 a/r should do the trick

 

[Burn Down]

A Garrett gt4718r with something like a .96 a/r should do the trick

.96 is to tight for a low pressure turbo... I wouldn't go any tighter than 1.15. Even then you would probably need to gate it on bigger tunes. 1.30 ish seems to be the magic number on the low pressure turbo and not having to gate.

 

[mr wang]

I've got my 72 twinned with a billet 480 and I tow a livestock trailer pretty often with a gross weight of 20000 to 28000 lbs and my egts run from 1000 to 1300 with my tow tune

 

[Cknight199]

Do you have the 72 already?

Yes I do.

 

[Hot COCOAL]

.96 is to tight for a low pressure turbo... I wouldn't go any tighter than 1.15. Even then you would probably need to gate it on bigger tunes. 1.30 ish seems to be the magic number on the low pressure turbo and not having to gate.

Yeah, you're right, .96 a/r would work for single turbo a/r probably not twins:rofl: but I always think about the drivability aspect more than top end power, I would rather have a quick spooling set up rather than one that really came alive above standard freeway speed limits, even then a .96 is too tight fer sure, lol. A 1.15 a/r seems pretty alright, but do you think a 1.01 would be ok, for a gt4718r over a vgt 72 twin set up that was pulling trailers?

 

[Cknight199]

Yeah, you're right, .96 a/r would work for single turbo a/r probably not twins:rofl: but I always think about the drivability aspect more than top end power, I would rather have a quick spooling set up rather than one that really came alive above standard freeway speed limits, even then a .96 is too tight fer sure, lol. A 1.15 a/r seems pretty alright, but do you think a 1.01 would be ok, for a gt4718r over a vgt 72 twin set up that was pulling trailers?

I also have hopes of 1100 hp at least once on the dyno.

 

[DieselmafiaLLY]

I also have hopes of 1100 hp at least once on the dyno.

sounds like a big budget

 

[Cknight199]

Well... Trying to keep it at 10k not including the added turbo. Going to try fingers oval pistons. This build is very far in the future though.

 

[DieselmafiaLLY]

10k for a motor build and compounds??