Not a 370z, but... VQ35HR ST (VSR) Begins

mad_jelly · 09-30-2014, 12:04 AM

Bobby has been great keeping me updated the past week. He pulled the motor on Sunday and broke down the shortblock today to find oil starvation on bearings and rings. Most likely from excessive G's.

Glad I chose to rebuild this thing.

Following COSMO's thread as well, I ordered blackstone kit. Maybe I should buy a magnetic oil plug as well. Been meaning to do so for my differential as well. Im sure I've cooked the oil in that thing at the track. If only differential coolers weren't so expensive.

mad_jelly · 10-08-2014, 11:27 PM

Plan is to assemble by next Monday, the 13th, throw a hundred miles on it, tune it on Thursday and back to me over the weekend.

I can't explain how bad im itching for this thing to be back, but importantly for it to be back to me right. Again, one of the reasons why I went with VSR. Yes, it may take a little longer than expected, but Bobby does follow through (at least from what's been documented on this forum).

Also picked up an 3qt accusump, oil filter relocation kit, and thermostat. Just gotta find a place to mount it.

mad_jelly · 10-13-2014, 04:44 PM

Motor assembled and nearly back into the car!

Plan is to put a few miles on it before tune Thursday.

1slow370 · 10-13-2014, 04:54 PM

so you have a motor being built and they couldn't pull the dowels and deck it? was it even honed? It even looks like theres some swirl up there like they commited the mls gasket no-no of using a scotchbrite wheel to clean off the gasket instead of using a fine scraper and a scrub with a rag so you don't eff up the Ra 4-6 surface on the deck.

mad_jelly · 10-13-2014, 05:06 PM

im not sure if it's completely necessary, but im a noob so i'll leave the decisions to the professional (who are also going to warranty the block). Surely they have their reasons from their experience.

I know the heads were done.

1slow370 · 10-13-2014, 05:27 PM

leaving that surface won't blow the engine per say it just makes the HG more likely to fail prematurely

Edit: The other companies that build these motors (GTM, IPP, Jtran) all deck the blocks to a new finish.

mad_jelly · 10-13-2014, 07:23 PM

^ makes sense. I'll bring it up on my call. Thanks for looking out

esfourteen · 10-13-2014, 10:48 PM

Quote:

Originally Posted by 1slow370

leaving that surface won't blow the engine per say it just makes the HG more likely to fail prematurely

Edit: The other companies that build these motors (GTM, IPP, Jtran) all deck the blocks to a new finish.

some machine shops will NOT deck a block unless you request it or they have to, its removing material. you do not need to deck a block to get proper head gasket seal

Nissan370 · 10-14-2014, 06:40 AM

So true on having that stuff done right. Once you get that girl back in the car and start putting the power to her. The small stuff starts to rear its ugly head.

1slow370 · 10-14-2014, 12:34 PM

Quote:

Originally Posted by esfourteen

some machine shops will NOT deck a block unless you request it or they have to, its removing material. you do not need to deck a block to get proper head gasket seal

It all depends on the head gasket and they way it was removed, and the intended use of the motor. MlS gaskets need a smooth finish to seal right, the best way to do this is to take .005-.01 off the deck just enough to cut the corrosion from the coolant and the old imbeded gasket off and ensure a flat deck, this is more important on a FI build (which is probably why the other shops that build these motors do it). If you intend to not deck the block, no power tools should be used to remove the old gasket, it should be done with a fine razor scrapper without scratching the head, and the remaining traces should be scrubbed off with a rag and gasket remover or brake cleaner. After which the block should be checked for flatness, using a scotchbrite wheel on an air grinder is going to scratch the deck and leave areas where the gasket will not seal right.

gbrettin · 10-14-2014, 03:19 PM

Can you elaborate anymore on the 3qt accusump and oil filter relocation kit? I'm guessing that is going to combat the oil starvation issue.

Thanks

1slow370 · 10-14-2014, 04:01 PM

the accusump is one line plumbed into the pressure side and is basically an air spring cylinder so as preussure comes up it fills the accusump with oil and as it comes down the accusump will discharge to slow the rate of pressure drop in the oil galley for a short time.

mad_jelly · 10-15-2014, 12:08 AM

^ this

http://www.accusump.com/accusump.pdf/instructions.pdf

It's also called the poor man's dry sump system. It serves two purposes, pressurizes the system on start up and also maintain pressure for a short period of time when the car loses pressure (due to bad pickup).

One of my favorite tracks but one that also destroys porsches
Accusump install-need an oil filter sandwich adapter - Rennlist Discussion Forums

Why porsche would have made for a better out of the box track car
https://www.youtube.com/watch?v=fv53RbvgfGc

mad_jelly · 10-17-2014, 11:19 AM

Great news! Car is tuned.

Bad news. Stock Nismo exhaust is holding the car back. The Nismo S tune exhaust is different on the 350, its a single 3" with a good amount of baffling in the muffler.

Big Thanks to Bobby and VSR for working into the night getting the car together. Its been a great journey so far and its far from over.

There are a few more loose ends to pick up before the car can be shipped back. Regardless, I am siked to get the car back.

Of course, rough result:

6 psi = 380 whp
8 psi = 420 whp
13 psi = 500 whp

Don't have torque figures, but im sure its way more than the 260 lb-ft I had before. Again, the stock exhaust seems to be holding a good bit of that power back. Glad Bobby and VSR built that block. Once I put my big boy pants on, maybe I'll "invest" in a more free flowing exhaust and really unleash the single turbo's potential.

Next steps include a shake down to get all of the bugs out, data log to refine any potential rough spots, throw some larger tires on the car, and just enjoy my first car out of college as it should have came out of the factory

I'll post up dyno's when I get them.

A little honeymoon reflection (still early and i'll update as I go forward):
IMO, the true value in a performance shop is how they handle "incidents" as incidents will inevitably arise. Every shop has their oopies, more importantly though, Bobby has made right their oopies (based on the threads i've read on 370z). I hope my story is free of incidents, but knowing that Bobby will come through regardless really settles the mind.

MidnightBlueZ · 10-17-2014, 04:21 PM

Nice numbers! Post your dyno sheet if you can get it. It does sound like the exhaust is holding you back especially on the high boost map. Can you not get Bobby to fab up a free flowing one to mate to their downpipe?

09-30-2014, 12:04 AM	#31 (permalink)
mad_jelly Base Member Join Date: Mar 2012 Location: VA Posts: 56 Drives: 84 Mazda GLC Rep Power: 13	Bobby has been great keeping me updated the past week. He pulled the motor on Sunday and broke down the shortblock today to find oil starvation on bearings and rings. Most likely from excessive G's. Glad I chose to rebuild this thing. Following COSMO's thread as well, I ordered blackstone kit. Maybe I should buy a magnetic oil plug as well. Been meaning to do so for my differential as well. Im sure I've cooked the oil in that thing at the track. If only differential coolers weren't so expensive. Last edited by mad_jelly; 09-30-2014 at 12:07 AM.

10-13-2014, 04:54 PM	#34 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	so you have a motor being built and they couldn't pull the dowels and deck it? was it even honed? It even looks like theres some swirl up there like they commited the mls gasket no-no of using a scotchbrite wheel to clean off the gasket instead of using a fine scraper and a scrub with a rag so you don't eff up the Ra 4-6 surface on the deck. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50 Last edited by 1slow370; 10-13-2014 at 05:03 PM.

10-13-2014, 05:06 PM	#35 (permalink)
mad_jelly Base Member Join Date: Mar 2012 Location: VA Posts: 56 Drives: 84 Mazda GLC Rep Power: 13	im not sure if it's completely necessary, but im a noob so i'll leave the decisions to the professional (who are also going to warranty the block). Surely they have their reasons from their experience. I know the heads were done. COSMO likes this.

10-13-2014, 05:27 PM	#36 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	leaving that surface won't blow the engine per say it just makes the HG more likely to fail prematurely Edit: The other companies that build these motors (GTM, IPP, Jtran) all deck the blocks to a new finish. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50 Last edited by 1slow370; 10-13-2014 at 05:30 PM.

10-14-2014, 06:40 AM	#39 (permalink)
Nissan370 Enthusiast Member Join Date: Feb 2011 Location: Baltimore Posts: 431 Drives: 2009 ST BLK 370Z Rep Power: 14	So true on having that stuff done right. Once you get that girl back in the car and start putting the power to her. The small stuff starts to rear its ugly head. __________________ 370z vsr motorsports single turbo/built motor 9.1cr 525rwhp/450rwtq @ 10.5psi (stock maf maxed out)

10-08-2014, 11:27 PM	#32 (permalink)
mad_jelly Base Member Join Date: Mar 2012 Location: VA Posts: 56 Drives: 84 Mazda GLC Rep Power: 13	Plan is to assemble by next Monday, the 13th, throw a hundred miles on it, tune it on Thursday and back to me over the weekend. I can't explain how bad im itching for this thing to be back, but importantly for it to be back to me right. Again, one of the reasons why I went with VSR. Yes, it may take a little longer than expected, but Bobby does follow through (at least from what's been documented on this forum). Also picked up an 3qt accusump, oil filter relocation kit, and thermostat. Just gotta find a place to mount it.

10-13-2014, 04:44 PM	#33 (permalink)
mad_jelly Base Member Join Date: Mar 2012 Location: VA Posts: 56 Drives: 84 Mazda GLC Rep Power: 13	Motor assembled and nearly back into the car! Plan is to put a few miles on it before tune Thursday.

10-13-2014, 07:23 PM	#37 (permalink)
mad_jelly Base Member Join Date: Mar 2012 Location: VA Posts: 56 Drives: 84 Mazda GLC Rep Power: 13	^ makes sense. I'll bring it up on my call. Thanks for looking out

10-14-2014, 03:19 PM	#41 (permalink)
gbrettin A True Z Fanatic Join Date: Oct 2010 Location: Portage, MI Posts: 2,281 Drives: Tricycle Rep Power: 589151	Can you elaborate anymore on the 3qt accusump and oil filter relocation kit? I'm guessing that is going to combat the oil starvation issue. Thanks

10-14-2014, 04:01 PM	#42 (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 accusump is one line plumbed into the pressure side and is basically an air spring cylinder so as preussure comes up it fills the accusump with oil and as it comes down the accusump will discharge to slow the rate of pressure drop in the oil galley for a short time. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

10-15-2014, 12:08 AM	#43 (permalink)
mad_jelly Base Member Join Date: Mar 2012 Location: VA Posts: 56 Drives: 84 Mazda GLC Rep Power: 13	^ this http://www.accusump.com/accusump.pdf/instructions.pdf It's also called the poor man's dry sump system. It serves two purposes, pressurizes the system on start up and also maintain pressure for a short period of time when the car loses pressure (due to bad pickup). One of my favorite tracks but one that also destroys porsches Accusump install-need an oil filter sandwich adapter - Rennlist Discussion Forums Why porsche would have made for a better out of the box track car https://www.youtube.com/watch?v=fv53RbvgfGc

10-17-2014, 11:19 AM	#44 (permalink)
mad_jelly Base Member Join Date: Mar 2012 Location: VA Posts: 56 Drives: 84 Mazda GLC Rep Power: 13	Great news! Car is tuned. Bad news. Stock Nismo exhaust is holding the car back. The Nismo S tune exhaust is different on the 350, its a single 3" with a good amount of baffling in the muffler. Big Thanks to Bobby and VSR for working into the night getting the car together. Its been a great journey so far and its far from over. There are a few more loose ends to pick up before the car can be shipped back. Regardless, I am siked to get the car back. Of course, rough result: 6 psi = 380 whp 8 psi = 420 whp 13 psi = 500 whp Don't have torque figures, but im sure its way more than the 260 lb-ft I had before. Again, the stock exhaust seems to be holding a good bit of that power back. Glad Bobby and VSR built that block. Once I put my big boy pants on, maybe I'll "invest" in a more free flowing exhaust and really unleash the single turbo's potential. Next steps include a shake down to get all of the bugs out, data log to refine any potential rough spots, throw some larger tires on the car, and just enjoy my first car out of college as it should have came out of the factory I'll post up dyno's when I get them. A little honeymoon reflection (still early and i'll update as I go forward): IMO, the true value in a performance shop is how they handle "incidents" as incidents will inevitably arise. Every shop has their oopies, more importantly though, Bobby has made right their oopies (based on the threads i've read on 370z). I hope my story is free of incidents, but knowing that Bobby will come through regardless really settles the mind. phunk and MidnightBlueZ like this. Last edited by mad_jelly; 10-17-2014 at 11:20 AM. Reason: (corrected exhaust name)

10-17-2014, 04:21 PM	#45 (permalink)
MidnightBlueZ Enthusiast Member Join Date: Apr 2013 Location: Nashville, TN Posts: 291 Drives: 13 Nissan 370Z Turbo Rep Power: 16	Nice numbers! Post your dyno sheet if you can get it. It does sound like the exhaust is holding you back especially on the high boost map. Can you not get Bobby to fab up a free flowing one to mate to their downpipe?

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