gt4718/DP72mm vgt

[Kramer]

What are your thoughts on this setup?

Danville 72mm 4094 (probably going to send to Mark for the vane upgrade), with a gt4718 feeding it. the gt4718 has a .96 ar turbine housing.

I'm not looking for a race setup. All it will need to do is be able to handle 75-80mph on the highway. Next summer I'll begin changing some things, bigger injectors, more cp3's, etc. Then I would switch to a 1.23 or 1.39 ar turbine housing, or wastegate it, and drag race it. My question on the .96 ar is, would this setup be alright to drive on the street?

If anybody has actually ran a gt4718, what turbo was in the valley, and what AR turbine housing did you have?

 

[Burn Down]

I think you will be fine. I run a 1.0 housing on my setup but I'm stock fuel and bottom end.
What injectors and fuel pump/pumps are you running now?

 

[Kramer]

What turbine wheel do you have? The turbine wheel in a gt4718 is only 93mm. That's why I'm slightly concerned. Built bottom end, 75% over injectors, wicked cp3 right now. Probably going to 100-150 over injectors this summer, and adding an Exergy 12mm pump.

 

[Hot COCOAL]

I was told the 4718 is ideal for something like the DP3794 or a GT4088/GTX4088 and even the 4094 or maybe a worked over s300 framed charger.

It would work for the VGT72, I had that charger and I too wanted to use the 4718 as an atmo with it. Mark said that the 4718's map wasn't ideal to pair with the 72 but it would still be a potent combo...yet not ideal, he said if a guy had the 4718 already, sure he could see using it, but if he were to need to buy the atmo, he'd go bigger, aka gt55/S500

I'm actually considering dropping my desire for Marks latest and greatest (68R) and use a 4718 with the stg2 3794 I've got now. It's a perfectly matched combo for 750(ish) wherein the compressor maps should be optimly balanced with a good drive pressure ratio, no choking out, no excess drive pressure building heat, no need for a gate.

yup, I just talked myself into it, that's what I need to do.


thanks

 

[Hot COCOAL]

What turbine wheel do you have? The turbine wheel in a gt4718 is only 93mm. That's why I'm slightly concerned. Built bottom end, 75% over injectors, wicked cp3 right now. Probably going to 100-150 over injectors this summer, and adding an Exergy 12mm pump.

thought you said you didn't want a race set up?
:roflmao:

all it needs to do is, what, at 75-80mph....?
leave a posi track for a gear?
:rofl:



I'm going to suggest you use a 55/s500:hug:

 

[Kramer]

I might end up with one of the new s300 framed 69mm chargers. I forgot the exact name of them, but I'm just going to call it "lil ripper" for now. I bet that turbo with a gt4718 would be a sweet setup. I'll try it with the 72mm first, and go from there. I guess if I get rid of the 72, I'd go bigger. Probably gtx4202/gt5533 or gt5541 eventually.

I meant it doesn't need to be a race setup right now haha. It's sitting at 664hp right now, which is plenty for winter in upstate NY. Next summer though, it'll see some changes that'll make it more race ready. Not a dedicated drag truck, but it'll be able to take pretty much anything on the street around here.

 

[Hot COCOAL]

:thumb:
sounds about right

I think, you're thinking of, the new FMW (forged metal wheel) line up?

 

[Kramer]

S369sx-e maybe? Supposed to flow close to 100lbs/min I guess

 

[Kramer]

I can't go from a 72mm to a 69mm. That's just unacceptable. Gtx4202 it is.

 

[mike diesel]

I've got a 98mm s500sx that would just go perfect with a gtx4202...

 

[Kramer]

That won't happen for a little while. That gt5541 you just got would go quite nicely with a gtx4202 also lol. How much do you want for that 98mm?

 

[Burn Down]

What turbine wheel do you have? The turbine wheel in a gt4718 is only 93mm. That's why I'm slightly concerned. Built bottom end, 75% over injectors, wicked cp3 right now. Probably going to 100-150 over injectors this summer, and adding an Exergy 12mm pump.

It's an 87. Stock fuel no worries for me. 75's and a stroker pump? I would monitor both chargers boost as well as drive pressure. Do the math and try to keep the big one in the meat of it's map. Not very hard to throw a gate on there either. Personally I think that 72 and that 88 will get along quite well together with your current setup.

 

[Awenta]

:thumb:

sounds about right



I think, you're thinking of, the new FMW (forged metal wheel) line up?

Forged milled wheel :thumb:


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[mike diesel]

Forged milled wheel :thumb:


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FMW is borgs version of billet. He's thinking of the SX-E chargers.

 

[Kramer]

It's an 87. Stock fuel no worries for me. 75's and a stroker pump? I would monitor both chargers boost as well as drive pressure. Do the math and try to keep the big one in the meat of it's map. Not very hard to throw a gate on there either. Personally I think that 72 and that 88 will get along quite well together with your current setup.

Sounds like a fun street setup.

Ya, I'll have about 6 gauges plus the edge insight I have now lol. It'll look like an airplane by the time I'm done installing gauges. Not excited for that, but atleast I'll be able to see what's going on and make changes accordingly. I've changed my mind so many times on this setup, and I haven't even got the turbo yet.

 

[chevyburnout1]

Sounds like a fun street setup.

Ya, I'll have about 6 gauges plus the edge insight I have now lol. It'll look like an airplane by the time I'm done installing gauges. Not excited for that, but atleast I'll be able to see what's going on and make changes accordingly. I've changed my mind so many times on this setup, and I haven't even got the turbo yet.

I hear you on that! I'm running out of room for gauges in my truck.

I'll be curious to hear how the 4718 works for you, especially with the .96 housing. I almost pulled the trigger on one but the "bigger is better" bug keeps biting at me and I'm thinking of upping to the 5533. I'd be very interested in how well it cleans up the exhaust, especially with that size injectors.

 

[Kramer]

I hear you on that! I'm running out of room for gauges in my truck.

I'll be curious to hear how the 4718 works for you, especially with the .96 housing. I almost pulled the trigger on one but the "bigger is better" bug keeps biting at me and I'm thinking of upping to the 5533. I'd be very interested in how well it cleans up the exhaust, especially with that size injectors.

I think I bought the one you were thinking about buying lol. It'll be a little while before I get everything installed. I wanted to go with a gtx5533 but this 4718 came up in the garage sale for a third of the price so I figured I'd try it out. I'm sure it'll light extremely quick, and probably blow the tires off at any reasonable speed, but I'm a little nervous about it being too tight for the top end. We'll see in a few weeks. I'll let you know how it runs.

 

[chevyburnout1]

Yup you're absolutely right! ! I found if I don't impulse buy something I'll never buy it lol. Been doing a bunch of flow map studying and such and I bet your combo would be an extremely lively setup with that .96! I wanna say drive pressures may not be ideal if you plan on maxing out those 75's. And will definitely not work if you wanna max out 125 overs. But that's all theory! Real word results also seem to vary. Keep me updated!

 

[Hot COCOAL]

Dont forget how the torque converter plays into spool up time and power delivery at launch and each shift :thumb:

The 72 moves a good amount of exhaust volume...I think I'd step up to a looser housing on the 4718 right off the bat, "in theroy" I like the 1.08 A/R on the 4718... I also live at sea level in a cool climate, which helps

My reasoning
First off, being the valley turbo is VGT, spool isn't as big of an issue, and secondly, I wouldnt think that you want even more drive pressure in the system (VGT turbo's inherently have more drive pressure already built into their design to work the VGT) on the top end the the tighter .96 A/R on the 47 will likely see/make, and be developing more heat, less effeciency etc...

I doubt your spool up time would suffer at all, using the 1.08 A/R on the 47, or, wouldn't be noticeable if coupled with the right torque converter and the power delivery was brought together properly...

Also
I'd take a softer hit off the line and at each shift with less tire carnage and more power and torque through the mid and top when I can put the torque to work, any day...so long as its not a smokey pig...

That's my uneducated grasp/thoughts/reasoning

I've been looking at this and now a very similar set up for some time...

Good luck man, I am definitely interested to see your results :hello: