In the past few years, the contempt has written a lot of content about the turbocharged engine, praised many advantages of the turbocharged engine, and also achieved the glad acceptance of the trend of internal combustion engine supercharging, so many readers have always thought that it is a turbo blow, in fact, the contempt is also a user of the Nissan VQ37 engine, but there are some rejection feelings of this illusory thing, too subjective thinking will only interfere with the objective judgment!
The origin of the Nissan VQ series engine
In fact, as early as 1983, Nissan put forward the concept of VQ engine, which can also be understood as the feather series; the meaning is to make the engine run as soft and smooth as a feather, the core concept is high efficiency, energy saving, lightweight, and the VQ series engine was released in mass production in 1994, VQ30DE released the year it won ward top ten, the follow-up product is the VQ35DE engine, also ward top ten; and the VQ37VHR engine is the final work of the VQ series. Won the Ward Top Ten in 2008; after all, the 14th consecutive Ward Top Ten was completed by the entire VQ series!
After 2008, BBA and other brands began to popularize a large number of turbocharging technology, so the VQ series gradually faded out of the Ward top ten, so it is not objective to say that VQ37 has won 14 consecutive years of Ward top ten; but the Nissan VQ series has been slightly extraordinary since its research and development, to know that Japanese industrial manufacturing in 1983 was in its heyday, and after 1985, because of the plaza agreement, the Japanese economy appeared bubble boom, so at that stage Japanese car companies build engines often regardless of cost Spare no effort, the VQ series is also created in this period!
What are the technical features of the VQ series engines?
Why did the above say that the VQ series has been a little extraordinary since birth? The reason is that the japanese car companies in that period had money that could not be spent, so the concept of Japanese car companies in that period was to lose money to build cars, but also to fight for a breath, at that time many ming machines such as 2jz, RB26 were born in this era background; what are the characteristics of the VQ series? The first is the angle of 60 degrees, the first and second order inertia torque is less than half of the 90 degree angle V6, and the smoothness is very close to the L6 engine (V6 is inherently balanced by the first and second order inertial forces, and the torque is unbalanced)!
As shown in the figure above, the difference between the 90-degree and 60-degree angle V6 engines in the first and second order of inertia torque (the formula can be understood, it does not matter if you can understand it, you know that there is a difference); the use of double overhead camshafts (DOHC) and 24 valve structure; the cylinder bore of 93 mm, stroke 73 mm, typical large bore, short stroke, standard high turn, even more extreme than the later VQ37HR; to know that even after 2000 the use of DOHC models is not much, It doesn't seem like much now, but in the early 1990s these were essential tools for high-performance engines, with more performance and a slight neglect of fuel economy!
How powerful is the VQ37VHR engine?
In fact, the most widely used model in the VQ series should be VQ35DE, VQ35HR and 37VHR are upgraded on the basis of this VQ35DE, applying a lot of technology delegated in the field of F1 at that time, such as camshafts using the ultra-fine grinding process in the field of F1, cylinders using the F1 field of true circle processing technology, DLC coating, etc. (that is, the mirror process); the HR at the end of the model represents high speed, and the essence of VQ37 is also this HR. For naturally aspirated engines, it is difficult to increase the power, and the only way to increase the displacement is to pull the speed to obtain power!
VQ37VHR and VQ35HR are quite different, but the most obvious is that the 37 is equipped with a continuous variable valve lift, which is the meaning of the HR front V in the model, remember that the 37 is equipped with VVEL regardless of the model, so there is no VQ37HR in essence, but in the parameter introduction of the 14 Q50, I don't know how to produce the VQ37HR naming method; this VVEL can be understood as an advanced version of variable valve timing, which is the same type of configuration as the Honda VTEC When the high-speed machine uses this speed to pull the power, it will face insufficient intake!
For example, when 6000 rpm is running, the crankshaft per second should rotate 100 times, because the 4-stroke engine has two turns of a cycle, which makes the intake valve open and close 50 times per second, and the opening time is too short to lead to insufficient intake; so the variable valve timing and lift are produced, which can be simply understood as the intake valve opening time is extended; and the lift can be understood as increasing the cross-sectional area of the inlet opening on the basis of the extension of the intake valve opening time; of course, this equipment is very common in the Japanese high turning machine at that time. High turnarounds must have valve lifts, just like Honda fans are obsessed with the sound of vtec when it is turned on, and VVEL also has a whistle!
Strictly speaking, the biggest feature of VQ37HR is actually not its performance, its performance is good, but it is not the ultimate, its biggest advantage (the advantage that the contemptible people really feel) is balanced, the power is enough to cope with the situation used in daily use, to feel that the track slips a few laps and rubs more than enough (pay attention to the brake pads); fuel consumption can be said to be arbitrary, high and low depends on how the driver to drive, contemptible people up to 17, In recent years, the price of oil can easily drop to 11.6, of course, the contempt often runs the ring line, the city road conditions are less, the same road conditions with 2.0T 5 series running, about 9 or so!
When the daily transportation is about 2000 rpm, VQ37 is as docile as a small sheep, 2300 rpm began to exert some performance machine posture, and when the Vvel opened at 5300 rpm, the power was very surging and a girl who did the contemptible car for the first time said that this car has "three-stage acceleration", the momentary power burst of VVEL opening is very abrupt, not as linear as the power output of the self-priming engine in your eyes; perhaps it is also the reason why the Jetco JR710E transmission is too pitted. The power output is not direct, the oil must be given a second during the drive, just like the turbo lag of the supercharged car, far less smooth than the BMW 2.0T, the reason is very simple how strong the tube engine is, the transmission pit directly destroys the smooth!
How much potential is VQ37HR?
Friends may often see VQ37 potential on some posts, such as what trapezoidal structure can withstand at least a thousand horsepower and the like, but in the eyes of contempt, the VQ37 cylinder block uses a fully open waterway (open deck), how is it not like the strength is very high, do not do strengthen the pull thousand horses should be another explosive, Subaru late machine why is always explosive? It's the open waterway for the pit! The VQ37 cylinder block is shown in the picture above, while the picture below is the cylinder block of the God of War VR38DETT, which uses a closed waterway!
Fully open waterway on weight reduction, heat dissipation has an effect, but the cylinder body to the cylinder liner support is insufficient, see the above figure of the GTR cylinder using closed deck, cylinder support to the cylinder is all-round, so if the non-reinforced VQ38 cylinder body can withstand thousands of horsepower credible, but the untreated VQ37 cylinder body to withstand a thousand horsepower is a bit strange, Nissan RB26, Toyota 2jz, Mitsubishi 4G63 are closed deck, so they can withstand thousands of horsepower; open The deck design doesn't even fit on turbocharging, as you can figure out with subaru's EJ20 engine!
So the cylinder block is not strengthened VQ37 potential is actually not as big as imagined, the simplest and most effective way is to change a set of high-flow intake, straight exhaust, and finally brush a new set of programs, for self-priming engines do not brush program almost no way to improve horsepower; VQ37 rated horsepower and wheels There is also a difference, rated 350 horses, about 300 horses on the wheel (personal feeling, not pulled), brushing the program head horsepower can barely reach about 400 horses, But the manufacturer calibrated to 7600 rpm oil speed is estimated to be broken, to reach about 8000 rpm!
As for the previous years circulating on the Internet to replace the American Z1 intake manifold can easily grow 30 horsepower is completely fictitious, Z1's VQ37 intake manifold is only on the basis of the original manifold on the nozzle, the inner wall of the smooth treatment, such as increasing the opening area, grinding off some burrs on the inner wall of the manifold to make it smoother, because the VQ37 intake manifold is plastic, with 400 mesh sandpaper even their own can be polished successfully, the original contempt almost bought, small ten thousand pieces In fact, if you want to pull the horsepower of the VQ37 down 400 horses, you really need to reprocess the intake manifold (or directly on the Z1), but only by processing the intake manifold, the horsepower can be increased by 1 or 2 horses is luck, so understand it!
Feelings of daily use
What is a high-speed engine? There are also high peak speed, high power, speed climbing is fast enough, for high speed engines these three points are indispensable; VQ37 also uses a large bore (95 mm), short stroke (81 mm) design, the speed response is rapid, floor oil can break through to more than 5000 rpm in a second, which is the fundamental reason why VQ37 has a high explosive force, so the daily driving slightly to the oil speed instantaneously, but it was seriously dragged by jetco 7AT, the speed response is fast, However, the engine torque transmission to the wheel is half a beat slower, smooth when upshifting, but slow to be speechless when downshifting, and it is still one gear, one gear down, can not do jump gear down!
So the despicable Q50 daily driving does not feel how smooth, the power output is not as linear as you think, the so-called power on call is just an idea; perhaps VQ37 let BMW match the transmission to it, only to really play its potential, the daily production capacity of the V6 self-priming to play to the extreme, but the transmission is a little bit interesting, in short, the daily use of the feeling is not as good as the contemptible 2.0T 5 series, although it is turbo but also smooth, power on call, There is no sense of turbo hysteresis in the keyboards ( note that you don't feel it, you don't say no hysteresis, because the turbo hysteresis state is objectively unavoidable).
VQ37 has been 15 years from the date of its birth, but it still has combat effectiveness, and 01 can still drop more than 95% of the models on the road in seconds (that remaining 5% is supercar, and M, S, AMG, R and the like, which may account for less than 5%), but from the data point of view, it is not as amazing as 15 years ago; you know, 15 years ago, G37 can reach 5.3 seconds of 01 is how terrifying, because the emergence of VQ37 and 2GR-fse directly drove BMW out of the self-priming world, before this BMW's N52 is the benchmark of the self-priming world, so the VQ37 15 years ago is a hegemon, as for now, the feelings are not extinguished, VQ is eternal.
All in all, although the VQ37 is classic, but it is really not the ceiling of the naturally aspirated model, at best it is one of the top V6 self-priming in civil aircraft, 7600 rpm oil speed, 95 hp of the liter power is not extreme; to know Honda's contemporary K20A, the liter power has reached 120 horses, the piston movement speed per second has reached 24 meters (F1 level), this is the ceiling of that period of self-priming, so that Ferrari chased for nearly 10 years; but the VQ37 is a very balanced, comprehensive machine, Large displacement avoids the embarrassment of small displacement self-absorption low torque, the choice of power and fuel consumption is completely determined by the driver, willing to oil it power burst, want to make it fuel-saving, pressure to about 11 is also very easy, but in addition it is difficult to think of its other advantages; after all, the times have changed, its 300 horsepower on the wheel compared to 3.0T + double clutch really has no advantage, which is also the reason why the contemptible people now prefer V6T, feelings are sometimes helpless, can not swallow and spit out.