VQ37HR block limitations?

kannibul

Besides the block, there's other limitations for RWHP - clutch/torque converter, transmission, driveshaft, differential, differential shafts/cv joints...

JoeD

I will agree, however the limits of driveline components are more so a function of traction (too much of it). Given there are no issues with weakness in the driveline in stock form as you see sometimes in other cars, a Z with double/triple the stock HP won't necessarily break anything if the tires spin. Shock is what breaks parts, and that can happen in a huge HP-range.

Which begs the question...who has launched stock or bolt-on Z on proper drag-tires?

Orphan

Trans onwards is a lot easier to figure out than the engines limitations. The new 6 speed box seems to be beefy from all accounts so I don't see 500rwhp for FI applications being any real issue but stock clutch etc will have to go.

I know an engine builder near where I use to live who got 580rwhp out of an old 4L toyota v8 though it was a pretty serious build, for the same engine for street use he thinks around 480rwhp as the one he built wasn't really tuned for street use. Besides being an open deck the VQ37 is better in basically every way and makes substantially more power stock. Considering Cosworth was getting 380-400rwhp out of the VQ35 those number should be much easier with the VQ37 not to mention more usable with the VVEL.

As the stock BHP is 330ish 380-400bhp should be easy if not more. As for the M3 engine are you talking about the latest 4L V8? The problem with that engine is that its engineered to be perfect how it is and doesn't have much room to improve in its current form without going to larger valves and bigger bore etc where as the VQ37 seems to have plenty of room to move up stock.

I guess we can only wait and see but I would imagine we will see 340rwhp+ N/A in the next 6-12 months. All depends on the design of the std of the head and how far the VVEL can be pushed.

KingDavid

I/H/E and a tune.

That was done a while ago, lol.

Orphan

Got a link to this 340rwhp+ N/A 370? I remember seeing a 300rwhp+ one but can't remember how far they got it. I can't wait to see 400rwhp N/A.

EDIT: The standard 370z gear box seems more than able to handle 400-500rwhp so just a new clutch there. No idea about the diff and rest of the drive train but if your not doing really hard launches I can't see it falling apart considering how power many older vehicles can handle on the standard drive train. The clutch is the number one thing that would need to be upgrading, after that I would think the diff before getting new cv joints etc, I haven't really seen any CV joints fail its usually the actual shafts from hard launches from what I have seen.

mrmixitup

Translation: You're going to be spending alot of money in the long run whenever running forced induction on a factory N/A car.

__________________
2009 370Z Sport/6M

bullitt5897

Limitation nahhh breaking points yes! The car will put down the power but the real question is at what point do those parts go kaboom and fail?

__________________
Shop Cars: 2013 318whp Nismo VspecII 370z *SOLD*, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054

rbthirty

Hey

Curious to know what kind of limits the block would go to with the Darton MID sleeves and possibly a billet girdle (I know ERL performance make them for the VQ35)...

kannibul

Maybe this is a dumb question, but I've seen several posts noting that an open deck is something desirable (and I assume this is in relation to the interface between the cylinder heads and the cylinders/block) - why?

Hi-TecDesigns

Depends upon what you're shooting for. An open deck allows for a more free flow of coolant around the cylinders, but a closed deck is stiffer and can handle more abuse from pistons that have more off-axis loads. Open decks are often easier to cast, but they're also often not as accurate tolerance-wise.

__________________
http://hi-tecdesigns.com/images/pict...on%20Small.gif
2000 S2000 Brickyard Red Metallic w/ Romanesque Crimson Kandy, custom everything else

G37Sam

A baseline of 302whp is a little too generous though

__________________

Lug

Yep, that's like only a 7 or 8 percent drive train loss....not likely.

__________________
keep Chubbs in your pocket - Chubbs

Orphan

Yeah the drive train loss seems a little low, 15-20% is more reasonable. Most stock dynos i've seen are in the 280-288 range which indicates a relatively low ~15% drive train loss.

G37Sam

Yup, it's all about the %gains and area difference between the two curves

__________________

BlownS2k

i dont doubt they can hit 500 whp safely on stock motor. But you have to look at what kind of manifolds and turbos are used. Im coming from FI'ed S2000s and before people thought the block was limited to 400 at most. Well while tuners push the limit and understand the car better they realize you can boost a lot more!

I see no reason for this block to be able to hit 500 whp reliably. **** in my S i can hit 400-450 with a stock block. What im curious is known what the max this thing can put down. Oh and open deck is fine for boost. A lot of engine builders use open deck builds on high hp (700+) cars.