Internal upgradess

Akrobatik · 04-12-2015, 08:59 PM

Iv heard that the stock pistons and rods on the 370Z are very durable. What PSI are you guys running on your stock internals?

bullitt5897 · 04-12-2015, 10:46 PM

Most are around 8-10 psi... But note that most people use HP and Torque numbers when discussing how much the internals can hold.

The problem some people run into with our motors is that every once in a while a motor may have a slightly bent rod... those motors tend to not last as long as others. Typical gauge for a "safe" and I say that lightly is running a boosted car with less than 500ftlbs of torque... many have put tens of thousands of miles on cars making right at or below 500ftlbs. Anything over that and history has shown us the motors typically throw a rod through the oil pan or out the side of the block...

My personal experience came in a kroger parking lot going from a 4 way stop... randomly just blew...

Dwnshift · 04-13-2015, 07:59 AM

The cranks on these engines are not ideal. Just about every engine we retire has a broken/cracked crank.
Just an FYI

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DOOMMONKEY777 · 04-13-2015, 08:33 AM

Quote:

Originally Posted by Dwnshift

The cranks on these engines are not ideal. Just about every engine we retire has a broken/cracked crank.
Just an FYI

On an N/A engine? Really?! What are your cap rpm shifts at?

dP3NGU1N · 04-13-2015, 11:50 AM

Any suggestions on the recommended internal upgrades if you want your engine to last? And maybe an idea of how much someone's looking at spending if they want to build up their block?

jwick · 04-13-2015, 11:51 AM

Quote:

Originally Posted by dP3NGU1N

Any suggestions on the recommended internal upgrades if you want your engine to last? And maybe an idea of how much someone's looking at spending if they want to build up their block?

What is your intended purpose for the built block? N/A? FI? WHP/WTQ levels?

theDreamer · 04-13-2015, 11:55 AM

Quote:

Originally Posted by jwick

What is your intended purpose for the built block? N/A? FI? WHP/WTQ levels?

This is huge, what are you building the engine for, N/A v Boost will be very different.
Such as Dwnshift (Doran Racing) is built for racing and must stay N/A others here are going SC/TT/T and need different compression, rev limits, etc.

For the OP, it really depends, the engines are good so far with many people putting on high mileage with boost but you also need to invest in supporting mods, a good tune, and keeping up proper maintenance.

dP3NGU1N · 04-13-2015, 01:47 PM

Quote:

Originally Posted by jwick

What is your intended purpose for the built block? N/A? FI? WHP/WTQ levels?

I suppose for the sake of this thread FI would be the desired hypothetical here. Since the engine "seems" (with exceptions) to be reliable up to 450/500whp, what say we assume it's over that threshold.

This is meant to be purely hypothetical and give people a ball park for how much work they can expect to put into a build. If I do go FI, it won't be for atleast 3 more years.

jwick · 04-13-2015, 03:26 PM

Quote:

Originally Posted by dP3NGU1N

I suppose for the sake of this thread FI would be the desired hypothetical here. Since the engine "seems" (with exceptions) to be reliable up to 450/500whp, what say we assume it's over that threshold.

This is meant to be purely hypothetical and give people a ball park for how much work they can expect to put into a build. If I do go FI, it won't be for atleast 3 more years.

Here's a good start

2009+ Nissan 370z VQ37VHR Custom Engine Packages

Dwnshift · 04-13-2015, 05:55 PM

2015 we run billet cranks now which were approved... They are a couple lbs heavier than OEM cranks but they are lasting.
We are limited to 8750 on the RPM.
I heavily suggest dry sump or bare min NISMO oil pump.

Also from what we have seen... 1 missed shift..... Can be all it takes.

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DOOMMONKEY777 · 04-14-2015, 07:09 AM

Quote:

Originally Posted by Dwnshift

2015 we run billet cranks now which were approved... They are a couple lbs heavier than OEM cranks but they are lasting.
We are limited to 8750 on the RPM.
I heavily suggest dry sump or bare min NISMO oil pump.

Also from what we have seen... 1 missed shift..... Can be all it takes.

Sent from my iPhone using Tapatalk

yeah dude the reciprocating motion is whats destroying the crankshaft, the cylinders and rods are very heavy and under 8750rpm its just a crazy amount of stress. If u would have upgraded to lighter rods that do actually have an oiling port, u would have been good. I dont know if its allowed in ur competitions, i my self have recently drew titanium rods total weight with bushing and APR 2000 bolts ~450grams, i think with OEM crank u can reach 10k rpm and maybe even more.

Dwnshift · 04-14-2015, 09:17 AM

Not an option

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DOOMMONKEY777 · 04-14-2015, 04:04 PM

Well in that case since they allowed billet crank, ill they allow other metals such as Titanium crankshaft?

Dwnshift · 04-14-2015, 05:36 PM

Negative.

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phunk · 04-14-2015, 06:31 PM

Dwnshift: Are you running a proprietary billet crank or an off the shelf aftermarket crank that anyone can buy?

04-12-2015, 08:59 PM	#1 (permalink)
Akrobatik Base Member Join Date: Apr 2013 Location: Attleboro, MA Posts: 75 Drives: 2011 370Z White Rep Power: 12	Internal upgradess Iv heard that the stock pistons and rods on the 370Z are very durable. What PSI are you guys running on your stock internals?

04-12-2015, 10:46 PM	#2 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3682	Most are around 8-10 psi... But note that most people use HP and Torque numbers when discussing how much the internals can hold. The problem some people run into with our motors is that every once in a while a motor may have a slightly bent rod... those motors tend to not last as long as others. Typical gauge for a "safe" and I say that lightly is running a boosted car with less than 500ftlbs of torque... many have put tens of thousands of miles on cars making right at or below 500ftlbs. Anything over that and history has shown us the motors typically throw a rod through the oil pan or out the side of the block... My personal experience came in a kroger parking lot going from a 4 way stop... randomly just blew... Akrobatik likes this. __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

04-13-2015, 07:59 AM	#3 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	The cranks on these engines are not ideal. Just about every engine we retire has a broken/cracked crank. Just an FYI Sent from my iPhone using Tapatalk GaleForce likes this.

04-13-2015, 11:50 AM	#5 (permalink)
dP3NGU1N A True Z Fanatic Join Date: Feb 2011 Location: Irvine Posts: 1,682 Drives: 13 PW sport 6mt Rep Power: 18	Any suggestions on the recommended internal upgrades if you want your engine to last? And maybe an idea of how much someone's looking at spending if they want to build up their block? __________________ 35% Hooper Optik \| Takeda Attack CAI \| F.I. HFC \| Hotchkis Sway Bar \| Stillen 24row \| OS Giken Super Lock LSD \| TK Shift Knob \| EVO-R Carbon Diffuser

04-13-2015, 05:55 PM	#10 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	Internal upgradess 2015 we run billet cranks now which were approved... They are a couple lbs heavier than OEM cranks but they are lasting. We are limited to 8750 on the RPM. I heavily suggest dry sump or bare min NISMO oil pump. Also from what we have seen... 1 missed shift..... Can be all it takes. Sent from my iPhone using Tapatalk

04-14-2015, 09:17 AM	#12 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	Not an option Sent from my iPhone using Tapatalk

04-14-2015, 04:04 PM	#13 (permalink)
DOOMMONKEY777 A True Z Fanatic Join Date: Oct 2010 Location: Crooklyn Posts: 1,008 Drives: 370Z 6psd-sport-pkg Rep Power: 21	Well in that case since they allowed billet crank, ill they allow other metals such as Titanium crankshaft? __________________ Kids don't do Drugs, Drugs are bad, so let the professional druggies do Drugs for you. 537whp/496lb/tq@8-9PSI 93 octane

04-14-2015, 05:36 PM	#14 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	Negative. Sent from my iPhone using Tapatalk

04-14-2015, 06:31 PM	#15 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,668 Drives: 370 Rep Power: 974723	Dwnshift: Are you running a proprietary billet crank or an off the shelf aftermarket crank that anyone can buy? __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph

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