Jtran Studios low mount single turbo setup completed!

LafitteZ · 10-27-2011, 12:32 PM

i have TT. For that price for a single I would have definitly went that route.

O&G · 10-27-2011, 01:03 PM

Dynojet rescheaduled for tomorrow due to the cold front hitting with rain and hi hummidity. We figured numbers will be more accurate with decent weather. Ill keep yall posted.

Sent from my SAMSUNG-SGH-I897 using Tapatalk

O&G · 10-27-2011, 01:10 PM

Quote:

Originally Posted by fuct

full boost at 4200rpm with a single or 3000rpm with GTM's TT kit. hmmmmmm

Sam and GTM are great they put out awesome products and helped us with this build as well. Yes smaller turbos spool faster. Like i said from the get go, I wanted sonething diferent. This build is exactly what i wanted and thats all that matters. The sound this kit makes is crazy. All you hear is turbo. Makes me smile!

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Nixlimited · 10-27-2011, 01:49 PM

Quote:

Originally Posted by O&G

Sam and GTM are great they put out awesome products and helped us with this build as well. Yes smaller turbos spool faster. Like i said from the get go, I wanted sonething diferent. This build is exactly what i wanted and thats all that matters. The sound this kit makes is crazy. All you hear is turbo. Makes me smile!

Sent from my SAMSUNG-SGH-I897 using Tapatalk

Actually, that's one thing that I missed when I test drove the GTM turbo setup. I really like a lot of turbo whine.

O&G · 10-27-2011, 02:06 PM

Quote:

Originally Posted by Nixlimited

Actually, that's one thing that I missed when I test drove the GTM turbo setup. I really like a lot of turbo whine.

I know what u mean. In my greddy/CJM 350 all i could hear was wastegate. I just heard Haltech mite be releasing a computer at SEMA to controll cams, etc.... Hopefully GTM will release their GTR manifold too!

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car8oy281 · 10-27-2011, 02:30 PM

full boost at 3000 rpm on twin t25 flanged turbos with log manifolds isnt hard to do. we have a g35 here that is fully built that has twin 2860rs on a jwt kit that makes full boost at 3000 but maxed out at 550 whp. if we would have done t4 divided setup, then the boost wouldve came on a bit earlier. We will have video and dyno chart up tomorrow of the dynojet tomorrow. rained a bit here in houston today and the car needs an alignment

Ron · 10-27-2011, 02:40 PM

what's the max psi you would push through a gt2860rs before it stops being efficient?

ihatepotholes · 10-27-2011, 03:01 PM

Quote:

Originally Posted by Ron

what's the max psi you would push through a gt2860rs before it stops being efficient?

i would guess around 11-13psi?

either way, it's more than the stock motor could handle.

SAM@GTM · 10-27-2011, 03:14 PM

Quote:

Originally Posted by Ron

what's the max psi you would push through a gt2860rs before it stops being efficient?

We have gone over 20 psi and made over 600 RWHP and still had room to go,on a VQ35DE engine. A VHR engine can do better . I'll dig up a compressor map and post up.

Sam

Ron · 10-27-2011, 03:15 PM

Quote:

Originally Posted by ihatepotholes

i would guess around 11-13psi?

either way, it's more than the stock motor could handle.

uuuh no.. 12psi with the right octane is good for over 500whp which seems to be right on the limit for this block in stock form.

I know people pushing/maxing gt2860rs at 24psi. My questions is, at what point do they become inefficient.

Ron · 10-27-2011, 03:22 PM

Quote:

Originally Posted by SAM@GTM

We have gone over 20 psi and made over 600 RWHP and still had room to go,on a VQ35DE engine. A VHR engine can do better . I'll dig up a compressor map and post up.

Sam

Thank you Sam, that's what I was looking for.. I also have a super noob question... How do you measure psi on twin turbo setup? ie: when you say you ran 20psi on a TT is that 10psi per turbo/bank?

SR20 guys with gt2860rs go up to 24 on a single turbo.. does that mean you can double that on a TT?

SAM@GTM · 10-27-2011, 04:00 PM

Quote:

Originally Posted by Ron

Thank you Sam, that's what I was looking for.. I also have a super noob question... How do you measure psi on twin turbo setup? ie: when you say you ran 20psi on a TT is that 10psi per turbo/bank?

SR20 guys with gt2860rs go up to 24 on a single turbo.. does that mean you can double that on a TT?

Measuring boost is measuring boost whether it is a twin or single turbo, I just used the 20 psi example on a car we did in past so i know for fact that The GT28RS can deliver a lot power . Garreet rate them @350 HP each and taht is why you see us rating our STG 2 turbo kit at 700HP witch is under rated .

Sam

ihatepotholes · 10-27-2011, 04:20 PM

Quote:

Originally Posted by Ron

uuuh no.. 12psi with the right octane is good for over 500whp which seems to be right on the limit for this block in stock form.

I know people pushing/maxing gt2860rs at 24psi. My questions is, at what point do they become inefficient.

misread your question. 500whp is on the limit, but it shortens the life of the block.

i have a friend runs that turbo on his evo, anything beyond 21psi the gain is minimum.

Ron · 10-27-2011, 04:20 PM

Quote:

Originally Posted by SAM@GTM

Measuring boost is measuring boost whether it is a twin or single turbo, I just used the 20 psi example on a car we did in past so i know for fact that The GT28RS can deliver a lot power . Garreet rate them @350 HP each and taht is why you see us rating our STG 2 turbo kit at 700HP witch is under rated .

Sam

Ok I think I asked the wrong question. I know 20psi is the same on a single or twin turbo setup since its measured at the manifold and not at the turbos.

I guess what I was trying to ask is that if a single gt28rs maxes out at 24psi by you running 2 of the same turbos will you be able to produce double the psi at the manifold if you wanted to?

Mike@GTM · 10-27-2011, 04:31 PM

Ok, first of all, here is a compressor map for the GT2860RS Turbo:

The Y-axis is Pressure Ratio and the X-Axis is Air Flow. The islands are the efficiency. As you can see, the efficiency is not simply a function of pressure ratio.

Pressure Ratio is how much the turbo is compressing the air relative to the inlet air pressure. So, at sea level where the ambient air pressure is roughly 14.7psi, a 1:1 pressure ratio will yield atmospheric pressure (0psi of boost) and a 2:1 pressure ratio is 14.7 psi of boost. To calculate boost pressure, multiply atmospheric pressure by the Pressure Ratio then subtract atmospheric pressure.

Remember that boost is simply a measure of restriction. The X-axis on the compressor map is the one that matters when looking at horsepower. Lbs/min of air directly correlates to lbs/min of fuel you can add. Fuel plus air = power.

Now, back to the efficiency question. Since the islands represent efficiency, this turbo is most efficient in the middle island. That said, if you think about setting a boost pressure (horizontal lines) and rev the engine through the range of the engine, the efficiency is going to go from low, to high and back down again at the same boost pressure. Now, if you want to hit the peak efficiency through the rev range of the engine, you'll need to run between 7.5psi of boost up to 19psi of boost. The sweet spot for this turbo is right around 15psi of boost. That will give you peak flow for the turbo while keeping it efficient.

In the case of a Twin Turbo setup, the flow rates are added together and boost pressure for both turbos are the same. So, to get the most out of a twin setup and run it as efficiently as possible, you can flow up to 70lbs/min of air at 15psi of boost. The rough rule of thumb is that for every lb/min of air you flow, you make 10hp. So, that's roughly 700hp potential for a pair of GT2860RS Turbos.

Pressure ratio is not additive but air flow is.

10-27-2011, 01:03 PM	#32 (permalink)
O&G A True Z Fanatic Join Date: Nov 2010 Location: Lone Star State Age: 42 Posts: 1,212 Drives: 40th Anv. Rep Power: 23	Dynojet rescheaduled for tomorrow due to the cold front hitting with rain and hi hummidity. We figured numbers will be more accurate with decent weather. Ill keep yall posted. Sent from my SAMSUNG-SGH-I897 using Tapatalk __________________ O&G's Build/Journal <---(1st lowmount single turbo treeseventy) Built Engine Thread 2011 F-250 Build/Journal

10-27-2011, 02:40 PM	#37 (permalink)
Ron A True Z Fanatic Join Date: Oct 2010 Location: Houston, TX Posts: 3,009 Drives: TT '11 PW Nismo #113 Rep Power: 22	what's the max psi you would push through a gt2860rs before it stops being efficient? __________________ 2011 Twin Turbo PW nismo #113 - My Journal - My TT Build Thread [ GTM GTX Stg2 TT \|\| HKS EVC6 \|\| Custom CarPC \|\| F.I 3'' TDX CBE \|\| SB 6puck clutch/ZSpeed CSC \|\| BC BR Coilovers \|\| SPC camber arms \|\| Work VSS-X \|\| Custom Headlights \|\| PW:JDM CF Covers \|\| Seibon CF Engine Cover ]

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10-27-2011, 12:32 PM	#31 (permalink)
LafitteZ Track Member Join Date: Jan 2011 Location: lafitte, la Posts: 698 Drives: 40th anniversary Rep Power: 15	i have TT. For that price for a single I would have definitly went that route.

10-27-2011, 02:30 PM	#36 (permalink)
car8oy281 Base Member Join Date: May 2011 Location: Houston Texas Posts: 37 Drives: 2005 nissan 350Z Rep Power: 14	full boost at 3000 rpm on twin t25 flanged turbos with log manifolds isnt hard to do. we have a g35 here that is fully built that has twin 2860rs on a jwt kit that makes full boost at 3000 but maxed out at 550 whp. if we would have done t4 divided setup, then the boost wouldve came on a bit earlier. We will have video and dyno chart up tomorrow of the dynojet tomorrow. rained a bit here in houston today and the car needs an alignment

10-27-2011, 04:31 PM	#45 (permalink)
Mike@GTM Not an active Vendor. DO NOT BUY Join Date: Sep 2009 Location: California Posts: 391 Drives: '13 Hot Lava FR-S Rep Power: 17	Ok, first of all, here is a compressor map for the GT2860RS Turbo: The Y-axis is Pressure Ratio and the X-Axis is Air Flow. The islands are the efficiency. As you can see, the efficiency is not simply a function of pressure ratio. Pressure Ratio is how much the turbo is compressing the air relative to the inlet air pressure. So, at sea level where the ambient air pressure is roughly 14.7psi, a 1:1 pressure ratio will yield atmospheric pressure (0psi of boost) and a 2:1 pressure ratio is 14.7 psi of boost. To calculate boost pressure, multiply atmospheric pressure by the Pressure Ratio then subtract atmospheric pressure. Remember that boost is simply a measure of restriction. The X-axis on the compressor map is the one that matters when looking at horsepower. Lbs/min of air directly correlates to lbs/min of fuel you can add. Fuel plus air = power. Now, back to the efficiency question. Since the islands represent efficiency, this turbo is most efficient in the middle island. That said, if you think about setting a boost pressure (horizontal lines) and rev the engine through the range of the engine, the efficiency is going to go from low, to high and back down again at the same boost pressure. Now, if you want to hit the peak efficiency through the rev range of the engine, you'll need to run between 7.5psi of boost up to 19psi of boost. The sweet spot for this turbo is right around 15psi of boost. That will give you peak flow for the turbo while keeping it efficient. In the case of a Twin Turbo setup, the flow rates are added together and boost pressure for both turbos are the same. So, to get the most out of a twin setup and run it as efficiently as possible, you can flow up to 70lbs/min of air at 15psi of boost. The rough rule of thumb is that for every lb/min of air you flow, you make 10hp. So, that's roughly 700hp potential for a pair of GT2860RS Turbos. Pressure ratio is not additive but air flow is.