Cost of a vk56 swap

1slow370 · 08-08-2014, 03:13 PM

the heads are probably going to get worked over, port polish, jun stage 2's maybe a little something xtra

aszyd · 08-11-2014, 09:40 AM

Sequential twins would be pretty sweet. That would be an interesting take on FI for the VQ.

1slow370 · 08-11-2014, 11:47 AM

Sequential's are kind of a pain in the **** because there is a lot more to it than just putting two different sized turbo's on it. you end up needing to add in exhaust valves and intake valves, and a way to control them so that when say number 1 turbo is spooling up the air isnt just blowing through the larger number two turbo's compresser housing backwards.

Spooler · 08-11-2014, 01:04 PM

Quote:

Originally Posted by 1slow370

Sequential's are kind of a pain in the **** because there is a lot more to it than just putting two different sized turbo's on it. you end up needing to add in exhaust valves and intake valves, and a way to control them so that when say number 1 turbo is spooling up the air isnt just blowing through the larger number two turbo's compresser housing backwards.

It's called compound turbo charging and is done all the time in the diesel performance world. It has also been done on OTR heavy haul truck engines. Cat has a setup like this. There is also tripple compound turbo charging. Turbo sizing is key to keep each charger in it's map.

1slow370 · 08-11-2014, 03:27 PM

Quote:

Originally Posted by Spooler

It's called compound turbo charging and is done all the time in the diesel performance world. It has also been done on OTR heavy haul truck engines. Cat has a setup like this. There is also tripple compound turbo charging. Turbo sizing is key to keep each charger in it's map.

no compound or series charging is when one turbo FEEDS the other turbo. They use it in the diesel world because by doing so you stack pressure ratios. so if one turbo can efficiently compress the air to 39psi absolute it feeds that charge into the second turbo that can push it up to 109psi while still in it's efficiency island. Diesels love having more compression so by doing this even if the turbos are relatively small it allows the engine to run at a much higher dynamic compression ratio.

Edit: the key in sizing doing that is just to match the pressure ratio's and efficiencies of the two turbo to get the target boost pressure, and to make sure that the intake turbo can flow enough compressed air to supply the second turbo

The VH45 is no bigger than a stroked vq so by going vk5.6 you have enough extra displacement to really make a crazy build worth it. the vh is good engine, revs higher than a vk stock but it is a little small to justify it.

Sidewaysthe7 · 08-11-2014, 04:04 PM

Quote:

Originally Posted by 1slow370

...The VH45 is no bigger than a stroked vq so by going vk5.6 you have enough extra displacement to really make a crazy build worth it. the vh is good engine, revs higher than a vk stock but it is a little small to justify it.

You're correct, but I'm referring to the VK45, not the VH45.

1slow370 · 08-11-2014, 05:26 PM

Quote:

Originally Posted by Sidewaysthe7

You're correct, but I'm referring to the VK45, not the VH45.

same deal. since vk45 and the vk56 are basically the same engine but one is bigger, cheaper, and more available the choice is easy.

G37Sam · 08-11-2014, 01:43 PM

Or you can buy one of Porsche's variable turbine geometry turbo's and call it a day.

1slow370 · 08-11-2014, 01:59 PM

Yeah no... I dont really care anyway anything past 500hp is worthless to me at this point. And vgt turbos have reiability issues

Sent from my HTCONE using Tapatalk

Sidewaysthe7 · 08-11-2014, 02:01 PM

I'm just jumping in here, but this conversation got pretty interesting. I am looking into possibly swapping a VK56 into a Y34, but for the Z guys, why not the VK45 instead of the 56? Seems like it might be a bit easier and should still make plenty power.

1slow370 · 11-25-2015, 10:04 AM

Well the platform changed a bit but same swap. its going in the 260z now hahaha. got the motor for 1500 with low miles, picked up a freshly rebuilt vortech v1 s-trim for 300 dollas and the trans came from the donor car for the 350z subframes. Still need a clutch and flywheel.

Array · 11-25-2015, 10:27 AM

Quote:

Originally Posted by 1slow370

Well the platform changed a bit but same swap. its going in the 260z now hahaha. got the motor for 1500 with low miles, picked up a freshly rebuilt vortech v1 s-trim for 300 dollas and the trans came from the donor car for the 350z subframes. Still need a clutch and flywheel.

That is going to be absolutely beautiful... Wish you nothing but an easy install!

Almost 5 years later and its finally coming together huh?

1slow370 · 11-25-2015, 10:25 AM

also the vk to de trans adapter is done already just need some more dowel pins and then get a vq35de flywheel and clutch so i can check the engagement of the friction disk and starter and make a block to use the vq starter mount to the trans.

1slow370 · 11-25-2015, 10:46 AM

Well i started the first time in the 370 but the project floundered when it was at gtm so i ended up switch to doing the full NA build on the v6 which made 371rwhp and then sold that car chaned jobs settled down a bit and now im restarting with the 260z which is a pre smog year so it just makes more sense anyway.

beemerkid · 11-28-2015, 11:54 AM

Glad your project isnt totally dead, rusting away in some garage. I'll be excited to see it in the 260. You could get some badges made up that say 560z lol.

08-08-2014, 03:13 PM	#1 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	the heads are probably going to get worked over, port polish, jun stage 2's maybe a little something xtra __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

08-11-2014, 09:40 AM	#2 (permalink)
aszyd Track Member Join Date: May 2014 Location: Florida Posts: 877 Drives: Magma Red 370z T+S Rep Power: 22	Sequential twins would be pretty sweet. That would be an interesting take on FI for the VQ. __________________ Competition Clutch\|Fast Intentions\|Maxbore\|NST\|Setrab\|Stillen\|Tomei\|Uprev\| Z1 Avant Garde\|SPC\|Stance\|Whiteline Aerojacket\|Seibon\|Tanabe\|TRS\|TWM

08-11-2014, 11:47 AM	#3 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	Sequential's are kind of a pain in the ** because there is a lot more to it than just putting two different sized turbo's on it. you end up needing to add in exhaust valves and intake valves, and a way to control them so that when say number 1 turbo is spooling up the air isnt just blowing through the larger number two turbo's compresser housing backwards. DEpointfive0 likes this. __________________ ANSWER PRICE LIST** Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

08-11-2014, 01:43 PM	#8 (permalink)
G37Sam A True Z Fanatic Join Date: Dec 2008 Location: Dubai, UAE Posts: 1,507 Drives: RB'd G37 Rep Power: 21	Or you can buy one of Porsche's variable turbine geometry turbo's and call it a day. __________________ '14 Viper GTS '08 RB'd G37S - Sold

08-11-2014, 01:59 PM	#9 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	Yeah no... I dont really care anyway anything past 500hp is worthless to me at this point. And vgt turbos have reiability issues Sent from my HTCONE using Tapatalk __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

08-11-2014, 02:01 PM	#10 (permalink)
Sidewaysthe7 Base Member Join Date: Jul 2014 Location: DFW, TX Posts: 29 Drives: '12 Infiniti M35h Rep Power: 12	I'm just jumping in here, but this conversation got pretty interesting. I am looking into possibly swapping a VK56 into a Y34, but for the Z guys, why not the VK45 instead of the 56? Seems like it might be a bit easier and should still make plenty power. __________________ -Brandon 2003 Infiniti M45 1981 Chevrolet Silverado RCLB (heh, try me)

11-25-2015, 10:04 AM	#11 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	Well the platform changed a bit but same swap. its going in the 260z now hahaha. got the motor for 1500 with low miles, picked up a freshly rebuilt vortech v1 s-trim for 300 dollas and the trans came from the donor car for the 350z subframes. Still need a clutch and flywheel. GaleForce and Meulen like this. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

11-25-2015, 10:25 AM	#13 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	also the vk to de trans adapter is done already just need some more dowel pins and then get a vq35de flywheel and clutch so i can check the engagement of the friction disk and starter and make a block to use the vq starter mount to the trans. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

11-25-2015, 10:46 AM	#14 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	Well i started the first time in the 370 but the project floundered when it was at gtm so i ended up switch to doing the full NA build on the v6 which made 371rwhp and then sold that car chaned jobs settled down a bit and now im restarting with the 260z which is a pre smog year so it just makes more sense anyway. lj909 likes this. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

11-28-2015, 11:54 AM	#15 (permalink)
beemerkid Base Member Join Date: Aug 2015 Location: Santa Rosa California Posts: 67 Drives: '16 sport 6MT Rep Power: 10	Glad your project isnt totally dead, rusting away in some garage. I'll be excited to see it in the 260. You could get some badges made up that say 560z lol. lj909 likes this.

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