2015 VGT COMPOUNDED WITH A S475

kyle43335 · Dec 20, 2014

Very nice!!!

ramonpowerstroker · Dec 20, 2014

Very very sweet setup, but If I'm not mistaken these 2015 turbos have a lot of backpressure issues. Something about a 2:1 ratio, around that area because of how small the housing is. But with a gate and some tuning I think you'll get 600, just put more fuel and watch your down low power, don't let full boost come on at 1500rpms LOL

I love this setup it's stupid clean, and functions perfect!!

jcain · Dec 20, 2014

ramonpowerstroker said:
Very very sweet setup, but If I'm not mistaken these 2015 turbos have a lot of backpressure issues. Something about a 2:1 ratio, around that area because of how small the housing is. But with a gate and some tuning I think you'll get 600, just put more fuel and watch your down low power, don't let full boost come on at 1500rpms LOL

I love this setup it's stupid clean, and functions perfect!!

You are mistaken.

jcain · Dec 20, 2014

Also, gearhead does have some ironed out 2015 turbo tuning. I've been working with him quite a bit to dial it in. We're up to 34psi currently and SUPER clean.

Swsignal5 · Dec 20, 2014

ramonpowerstroker said:
Very very sweet setup, but If I'm not mistaken these 2015 turbos have a lot of backpressure issues. Something about a 2:1 ratio, around that area because of how small the housing is. But with a gate and some tuning I think you'll get 600, just put more fuel and watch your down low power, don't let full boost come on at 1500rpms LOL

I love this setup it's stupid clean, and functions perfect!!

My back pressure is below 1:1 when the charger is lit. If I go WOT when in overdrive I'm only seeing about 2:1 until they light up. At 60mph cruising in overdrive I'm seeing 3# of boost and 2-3# of EBP while maintaining 24.5 mpg on 35" open country's.

bigrpowr · Dec 20, 2014

Ebp will never be scary just cruising. But I would be worried about 2:1 at peak boost levels. Hope you have a spare short block.

Swsignal5 · Dec 20, 2014

bigrpowr said:
Ebp will never be scary just cruising. But I would be worried about 2:1 at peak boost levels. Hope you have a spare short block.

No it only gets 2:1 when there's no boost and I stomp on it. As soon as they light it drops below 1:1 my s475 has a 1.32 ar so I'm sure that helps

97stoker350 · Dec 20, 2014

Videos!!!!

ramonpowerstroker · Dec 20, 2014

jcain said:
You are mistaken.

Please explain.

Not starting anything I learn something everyday!!LOL

jcain · Dec 20, 2014

Morgan has proven that ebp is not 2:1.

ramonpowerstroker · Dec 20, 2014

jcain said:
Morgan has proven that ebp is not 2:1.

You're talking about having a gate though, and Morgans doesn't have a s475 sitting in front of the stock turbo

Morgan@Midwest Diesel & Auto · Dec 20, 2014

Without a gate I still have never seen 2:1. Gate closed big tune and 64mm I saw max of 1.7:1 and that was only when it got up around 4000 rpm. Up to around 3500 it was 1.4:1 max.

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ramonpowerstroker · Dec 20, 2014

Morgan@Midwest Diesel & Auto said:
Without a gate I still have never seen 2:1. Gate closed big tune and 64mm I saw max of 1.7:1 and that was only when it got up around 4000 rpm. Up to around 3500 it was 1.4:1 max.

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So he should be fine?

Morgan@Midwest Diesel & Auto · Dec 20, 2014

ramonpowerstroker said:
So he should be fine?

With a factory 2011-14 pump and decent tuning it should not have a chance for enough fuel to have high drive pressure. With a dual pumps and a big tune a gate will be 100% necessary.

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Swsignal5 · Dec 20, 2014

Morgan@Midwest Diesel & Auto said:
With a factory 2011-14 pump and decent tuning it should not have a chance for enough fuel to have high drive pressure. With a dual pumps and a big tune a gate will be 100% necessary.

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With my hot tune right now I'm maintaining 29k psi rail at WOT And hitting 46# of boost. Still have room for more with proper tuning