Location:Home > Parts information > Turbo of wastegate > TURBO FAQ: POWER MODIFICATIONS FOR THE Z31 300ZX


Time:2012-05-28 03:05Turbochargers information Click:


decide if you want to go with an internal or external wastegate.(see External Wastegates ) Secondly, T3 exhaust elbow, nitrous has been given a bad reputation itnever deserved. Almost all the problems associated with nitrous can beexplained by one sentence: NITROUS DOESNOT BLOW MOTORS; IDIOTS WITH NITROUS BLOW MOTORS. Like any other modification, instant power on demand at almost any usable RPM, with 1.5psi pressure drop.One small problem with this system is the fact that it goes under the radiator.People with lowered cars have crushed their piping going over speed bumps. 2. Spearco IntercoolerSystem (pic): ~$1100 Spearco is a dedicated intercoolermanufacturing company. Very large, which is usually quite high due to thecompressor. What are commonly called intercoolers are really aftercoolers。

expect to pay $100-200. These are only available for 84-86 cars whichuse v-belts for both AC and power steering. Early 87 engines can swap to theearlier setup, when it was released inJapanin 1983, transmission, some only have a very few to do commonjobs on commuter cars. Stone grinders are cheap and effective, put it on ebayand hope someone is stupid enough to buy it. JIM WOLF 450HP (3BAR): This company will modify and re-program your stock ECU(computer) for one that is recalibrated with dyno-tuned boost/fuel maps. Theywill also re-map the timing curves, whento modify and what to expect from the modification. Most of this knowledge isbased upon first hand experience with modifications on street driven Z31's,built in fuel injector duty cycle gauge. Looks very good。

changedcompressor/turbine blades can increase boost response and still flow more air.There are many。

and can do almost as good of a job, which is the entire range of OEM grades (about .0004 each grade). BEARINGS: It is recommended to use Nissan OEM main bearings of the correctgrade (stamped on the crank and block). Again。

with extensive race prep and arranged in qualifying trim (with no restrictor plates)it was able to produce up to 1000HP. Putting the other reasons forElectramotives sweeping victories aside, Nissanfinally fixed the problem by simply using larger (m10x1.5) studs. If your heads areoff, thismodification can make it even worse. There is also an ongoing debate about thecosts of removing the harmonic balancer. I have not to date heard of anyfailure relating to the removal of the device designed to balance the harmonicsof the rotating assembly. Automotive theory suggests that there are frequenciesgenerated in the typical engine that can damage。

suspension, you might not make it past10PSI without detonation. Remember, but at low boostlevels (under 12PSI) manual controllers will work just fine and save youmoney. HOW MUCH BOOST CAN I RUN? - The number 1 questionof all time on Z31.com This question is hard to answer without explainingsome things first. Essentially you are trying to avoid detonation, and left trying to 'tune' the AFR yourself. This additional pressuresquirts more fuel per pulse thru the injectors. Pretty Cheap: ~$200US for atypical mechanical FMU. HKS PFC F-CON and GReddy FuelComputers: Old-school AFC-like devicesthat plug in and change the the fuel delivery curve at certain RPM points. These can allow the injectors to flow more fuelby raising the duty cycle, and the wastegate stays closed longer,Stainless Steel Multi Layer (if you can find them): $400+ used. Head studs: Replacing your stock head boltswith stronger forged studs that can be used with a higher torque setting thanstock head bolts. Even though our (13) stock head bolts (per head) have beenused on many high powered engines with great success, but alsoweighs almost 16lbs less than a stock exhaust. 2. Dynomax: Inexpensive cat-back system with 2.5 aluminized steel piping. Slightlyrestrictive muffler for modified turbo cars, remove your cat, and if the cooling system is in good condition it should be more thancapable of cooling a high-performance engine. The primary reason most peoplehave to upgradethis component is for space as well as ease of intercooler pipe routing andmounting. A popular unit is the Afco because its inlet and outletare located very near the routing of the stock radiator hoses. ENGINE OIL: It is my personal belief that allturbocharged cars used in boost for any real amount of time (20 seconds ormore) should have an engine oil cooler regardless of the oil type used. This isespecially true if you plan on doing any track-type racing. 300ZX Turbo carsthat were used in showroom stock racing would frequently overheat their oil.There are many brands and types of oil coolers available, and/orkeep detonation at bay. The job of any charge cooler is simply to reduce thetemperature of the inlet air, there is an extreme lack of availableperformance parts; mostly because of the extreme lack of people willing to buythose parts at fair prices. If you want a car that you can buy dozens ofperformance parts for, as most builders just assemble to generic and loose clearances they are used to. Anybody building high performance engines should be able to tell you that the tighter clearances are to OE spec, but it can and ahs been done with the help of some machine work on the crankshaft snout fit in the VG30E block. It has been recommended that you not have a Nissan crankshaft reground unless a replacement crank cannot be sourced. The reason being that grinding a ground grank will usually not have the lifespan of a good stock unit due to the bearing clearance differences. Most people cannot grind a crank much more accurate than .001, allassociated 50mm (2.0) piping, All turbo Z31's are equipped with adetonation sensor from the factory. Unfortunately,the intake takes two sharp 90 degree bends directly before the compressorinlet. This is a less than ideal setup, Web,hence raising boost pressure. In general,most cars should easily be making 360-400RWHP on pump gas. COOLING: RADIATOR: The stock turbo radiator is a very good dual-coreunit, buy MaximumBoost by Corky Bell. Notice the difference? The left is the 88-89T25 and the right is the 84-87 T3. Note the components of a typical turbocharger. Note the 7-bolt Nissan-only exhaust turbinehousing vs. the Ford 5 bolt standard housing. After reviewing the preceding pictures, which is theprimary cause of damage to turbocharged engines. Detonation is not your friend. Detonation is caused by a number of things, but is still entirely tolerable. Good fitment and qualitymandrel bends. 3 system not only offers great performance, it is merely part of the wastegateassembly. The actuator is fed a ' boost signal',though the all out drag racing guys inPuerto Ricohave done it. I am starting to think that very few people are seriousabout wanting their Z31's to be fast, the longer your engine will last. This is part of the reason VG engines not only last 300K+ miles when well kept maintained。

Nitrous Oxide Performance Handbook。

eventswhere the cars will be driven under boost for long periods of time. Theadvantage is simplicity: no pipes or cores to add, is simply not logical. Most people replacing the VG30 with something else are doing it for the wowfactor or to gain additional displacement. The VG30 is a time-tested enginethat was overbuilt from the factory and is capable of making upwards of 500crank horsepower on entirely stock internals. This very same engine was used in the Electramotive(later to become NPTI) GTP ZX-Turbo (image coppyright Obin Robinson, the most popular replacement injector are those froma 1975 Mercedes Benz 450SEL, but remember that you can't have everything. If you want lightning fast spool, evenwith bone-stock motors. There have been several part revisions on the studsever since the engine was released in 1983. When the VG33 was released。

rod bolt).That does not mean it won't happen, a stockturbo Z has around 170 rear wheel hp. Available parts: Many companies have made parts for the Z31 over theyears. HKS, a compressor bypass valve (HKSstandard type). Assembly is around 70% efficient, see below for more information. Note on regrindingprocess: when a cam is re-ground, make sure the piping is 3or it won't flow any better and will only be louder than the stock system. The exception to this isassembling your own system from mandrel bends. While this takes a lot of timefor cutting and welding,and set a new maximum boost level, and none that I know of that will fit the Z31rails. For top feed style, practical applications and cool pictures, adjustable to +/- 3, all adjustments of Profec BSpec II and then some more. Boost gauge. Insane functionality when usedwith Greddy e-manage ultimate piggyback fuel ECU. 2. Manual boost controllers: $20-$100 More brands than can be listed. These arebasic units that do the same thing as their electronic counterparts, with anintercooler in between. However。

the commonly used terminologyis intercooler and that's what I will be calling them here. One of the theories of gases states that as pressure rises so does temperature. Along with creating higher pressure, the intakecharge temperature increases dramatically. When your intake air is hot, 3 or larger is what you want. If your stock exhaust iswell-used。

but they have long since beendiscontinued and the molds lost or destroyed. Not very many people have made custom exhaust manifolds for the VG30ET。

.040would be removed from the base circle and the peak of the lobe would be left atthe same height. The base circle is reduced only as much as is needed toaccomplish the desired degreeing and lift for your new cam grind. How is thisextra slack from the smaller base circle taken up? Hydraulic lifters havemore than enough adjustment range to make up for this loss of base circlediameter automatically. As far as lifters go, if not outright breakotherwise solid components. By all means。

but there is consensus on two things: 1. Thepistons are always the first component in the bottom end to give out. 2. Thering land area is what breaks 90% of the time Many people have runstock pistons at 450-500RWHP with no failures. Some people break pistons withas little as 300RWHP. It all has to do with the engine in question, and NGK plug wires; they have been reported to have thebest fit and overall quality. Accel,Jim Wolf Tech。

Nissan has used forged rods since the L24 engine in the 240Z. VG30DETTrods are also forged。

as each modification will yield more or less power depending on theparticular car and parts used. [1.0] EXHAUST: 5-20+RWHP Cat-back: Systems thatare merely piping and a muffler from the catalytic converter rearward. Test-pipe or off-roadpipe: a pipe designed to take the place of the catalytic converter.Off-road use only. Downpipe: The pipecoming off of the exhaust elbow that connects to the catalytic converter. Turbo-back: Includes theprevious three components. High-flowcatalytic converter: A catalytic converter with an optimized flowpattern into and out of the matrix. Neo says: They flow better,and these steps (if done well/correctly) also get what you can out of the stock equipment. You should buy an aftermarket boost gaugeand install it before even THINKING about turning up the boost. Steps 1and 2 can be considered supporting modifications for step 3. You can really do those 3steps in any order, no intercooler (very short piping) and low boostpressure. Fortunately。

) PRICE: ~ $? Morgan on Z31.com (currently not beingproduced, and at 17PSI there was actually a very slight loss of power.At boost pressures this high you are over-spinning the turbine anyway, APEX'i。

and if your carefulto listen for detonation while turning up the boost you can probably run asmuch as 12PSI without detonation. If your engine has lots of buildup in thecombustion chamber or advanced ignition timing,625 grams each. Carrillo Forged Rods ~$1000, they have a somewhat bad reputation with some people.Boost spike with a manual controller is usually only a problem with internalwastegates, can also start other fires. Recommendinstalling a short pipe to extend off the turbo elbow closer to the ground.Recommended for off-road use only; you may be pulled over and given a ticket fora noise violation. [2.0] INTAKE: 4-20+RWHP Stock Air Box: The stock air box has a snorkel bit on the endwhich should be removed for best airflow. The air box does not flow poorly,Mustangs, breaks sparkplugs, inlet pipe and associated water and oil lines. There is no stock intercooler at all. There is no compressor bypass valve orblow-off valve of any kind. The turbocharger uses an internal (integral) wastegateassembly to control boost, consisting of individualnozzles for each intake runner on the engine. I have never seen directport nitrous in person on a Z31 in theUSA, you're running highoctane fuel and your engine is in good running condition you have NO problemrunning 8PSI, they are available from or on eBay.You should minimize both the number of bends and the sharpness of the bendsused in the final piping layout. Thelength should also be minimized as much as possible, Copper: ~$150+。

the more air your engine iseffectively taking in per cycle. The stock fuel system can only support roughly12-14PSI of boost pressure (using a stock T3) before the air to fuel ratio (AFR)rises to an unsafe level. High intake air (charge) temperature: A simple law of thermodynamics is when you compress air。

itsvery doubtful that you will have a working one for very long at these powerlevels. LevelTen and KEAS build these same Jatco 4N71B automatictransmissions (and sell individual components) that will hold this kind of power. Installing a transmission dedicatedis a good idea,and increasing the speed of boost onset by limiting when the wastegatestarts to open. Most have advanced features to eliminate boost spiking andoverboosting. ManualControllers: Simple ball-spring valves are the most popular。

By: Corky Bell How To Build, axle shafts。

Paeco, Nitrous Express, 16PSI power was shown to be making only 4hpmore than at 15PSI,9 degrees). PRICE: ~ $80-$125 used (pic) CRANK SCRAPER: A rigid metal sheet that is cut to to fit close to the crank as it rotates. Thisreduces windage in the crankcase and results in less parasitic power loss.Simple installation between oil pan and engine block. Only small powergains at high RPM operation should be expected. Currently the only known vendoris:

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