Stock Block VHR limit.

derek_370z

For all my F.I. folks, I plan on getting my 370z boosted this summer. I've been seeing a lot of videos on YouTube in which some 370z's are touching between 600-700whp on the stock block. My main concern is how reliable my block will be running the numbers I have planned short-term before building the motor down the road. My mods for this build are as follows:

BP Turbo kit (COMP 6467 Turbo)
CJM S1.SE Fuel Return System
IDX 1300CC injectors
AEM 340 lph Fuel Pump
Tomei Catback Exhaust
Zspeed Stage 3 clutch w/ lightweight flywheel

I intend to run 10.5 psi off wastegate spring and E85. My goal is to be in the 500-550whp and 450-520tq. range. I'm sure this will be easily obtainable with the help of my tuner. I feel this is a conservative power goal. The kicker is my engine is at 138k miles (mainly highway) and will slightly increase as I recently just bought a new daily. I have not done a compression test, although, I do feel the motor is still fairly healthy. I need opinions and feedback on if my motor will be fairly reliable for the time being until I do an engine rebuild down the road. Any feedback is welcomed, negative or positive. Thanks!

Spooler

With that many miles it is hard to say how long it will last. You need to do a compression test to see how it is doing. I can just about guarantee the galley gaskets may be done. Hard to say since it is a 2014.

Elmo370z

You will be fine. Just don’t be a dummy

NissanZ34

I read somewhere an unofficial claim that said they are pretty much maxed out at 700whp and 600wtq. They don't last long with that much power. It is safe to assume if you stay around 500 whp and 450tq it should last a good decent amount of time.

Now if I had the money and intended to go forced induction, I would do supporting mods first such as exhaust, clutch & flywheel, big oil cooler, motor & transmission mounts, differential brace, differential bushing and a tuning license.

Then I would have the motor built from the ground up or at very least pistons and connecting rods. Get the injectors and fuel pump along with aftermarket fuel pump hat.

Then I would get the turbo kit and the remaining needed parts.

Proceeding in this order will insure you to do it only once.

BGTV8

Some basic maintenance (like oil galley gaskets) would be a wise investment

husam2012

For a 2014, the gallery gasket is most certainly the fixed version and doesn't need changing but it wouldn't hurt to check it while the motor is out.

As for reliable power, the GTR limit for stock rods is 600 ft/lbs. Anything over and its guaranteed to not last long.

As for the 370Z, the rods have about a 20% decrease in width compared to the GTR so I wouldn't expect the stock rods to last a reasonable timeframe above 500 WTQ.

I would definitely do a filter cut and a compression test before doing anything though. The worst thing is having the motor go out right after you install everything.

__________________
Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP)
Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58)
BTWTuning

jchammond

Definitely compression/leak down test & correct supporting mods
Unsure if that single 340 will fuel those 1300’s

Sharpen up your pencil & make a thorough list before you begin, and try to eliminate weak spots.

Recently had a discussion with a friend about this & boosting a stock block, staying 10/12# max....they wil hold for a while

Have a reliable tuner; as they’re tune will contribute the most to the longevity....+ you purchasing consistent fuel

__________________
MazWorx built long block | FI-TT-100 Stage 2.75 | IPT built 7A/T

http://www.the370z.com/members-370z-...s-musings.html

derek_370z

I think i'm going to do that for a piece of mind. I have had the car for over 5 years, put over 120k miles on it since owning it, and haven't had a single issue with the motor/trans. Still on original oem clutch/flywheel. Kept up on maintenance regularly. Obviously, F.I. can deff cause inevitable problems, which I know it will it in some sort of fashion. Just hope it'll last long enough for me to have fun in it till I do an engine rebuild.

redondoaveb

As jchammond pointed out, why are you trying to feed those 1300cc injectors with a single 340. I run twin pumps with my 1300cc's

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Fast Intentions "Stage Seb" twin turbo #098- Specialty Z/Tial-Xonarotor/CJM/Ecutek/HKS/KW/SPL/Hotchkis/Rohana/Toyo
700+whp

derek_370z

That is what the shop I'm taking my car to told me to get. Still kind of a novice on proper fueling needs for the right injector sizing. As I get closer to slapping the kit on, I will reach out to the shop again to ensure if the 340 can support the 1300cc's. Worse case is I just cough up more money and get the cjm twin pump and another 340.

redondoaveb

Or possibly just go with a single walbro 525 hellcat. That would save some money.

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Fast Intentions "Stage Seb" twin turbo #098- Specialty Z/Tial-Xonarotor/CJM/Ecutek/HKS/KW/SPL/Hotchkis/Rohana/Toyo
700+whp

Spooler

What shop are you using? It makes a big difference on your outcome.

jchammond

Can definitely make or break your engine for sure

__________________
MazWorx built long block | FI-TT-100 Stage 2.75 | IPT built 7A/T

http://www.the370z.com/members-370z-...s-musings.html

derek_370z

I live in Maryland. There is a reputable shop outside of Baltimore called Hills Garage. They specialize in Nissan/Infiniti's.

Spooler

I would suggest MA-Motorsports in Glen Arm. They have done all my work.