MotoIQ Tech

Project Silvia lead JIC Strut story

Project Nissan S13 Silvia: How to Polish Your Tube
(or What to do When Your JIC Struts Dry Up)

By Dave Coleman

Engineering a car is a series of compromises. When Nissan decided to make the 240SX a slow, soft piece of suck, it was a compromise calculated to make it durable, quiet, easy to drive every day, and cheap to build. When I decided to take this same worn-out, 300,000-mile piece of suck and make it fast, I was naturally sacrificing some of that comfort and undoubtedly some durability.


G-Spec Nissan 370Z brake line Infiniti G37

G-Spec Braided Steel Brake Lines for the Nissan 370Z Rock!

By Mike Kojima

We recently evaluated a set of G-Spec lines for the Nissan 370Z.  The G-Spec lines also fit the Infiniti G37 Sedan and Coupe. We installed them on the Killer B which is starting to become our official 370Z Project demonstrator vehicle.  The Killer Bee is a Sport Package 370Z with the standard factory big brakes.  Although the Sport Package 370Z has exceptional brakes, some improvement can usually be found by installing braided steel lines.  This is because stiff braided steel lines do not expand with pressure like the stock rubber lines

Demolition Derby Tech Part 1- A Tech Look Inside the Disposable Motorsports Machine

By Mike Kojima and Aaron Guardado

Although you might think that Destruction Derby is the simplistic smashing of cars, it is actually a pretty sophisticated formula with an evolved set of rules that allow a high level of safety and competitiveness with a very low cost of entry.  Destruction Derby has a rich history dating back over 50 years and the rules and regulations have evolved continuously since then.  Let us discover what is inside a typical car preped to the maximum level of the rules.


How to Make Your Own Effective Exhaust System

By Mike Kojima and Sarah Forst

You are bummed.  You don’t own a Honda, STi, EVO or some sort of popular sport compact car.  Maybe you have an old school Celica, Corolla, Cavalier, Neon, Hyndai, Geo, Saturn or a similar ride that does not have tons of aftermarket support.  Maybe you want a spiffy all polished stainless system but can’t get a pre-made offering that you like.  Maybe you do have a popular car but it has a ripping turbo system and no one makes a good pre made 3” system for your car.  What to do?  Well we will show you how to roll your own system that will be as good as, maybe even better than a commercially made system, probably for less money as well!


Project Low Buck Nissan SR20DE Part 2

By Mike Kojima

In our last edition of Project Low Buck SR20DE, we stated our goals to obtain a decent amount of naturally aspirated horsepower and good track day drivable reliability from an underdog plain jane SR20DE without braking the bank. Fulfilling these goals would also create an engine with excellent street driving characteristics as well. All of our engine work will be done on the cheap with a tight budget in mind but with plenty of attention paid to minor details that can really help an engine live under the stress of track day pounding, perhaps the most abusive environment that a grass roots enthusiast will subject his engine to.


Header Design - Part 2

By Sarah Forst

The greatest advantage of a tubular header comes from inertial tuning, which improves scavenging, or the removal of exhaust gases from the cylinders.  When the exhaust valve opens, high (5-15 psi) pressure exhaust gases blow down the exhaust port at about 300 feet per second.  The hot exhaust gas has a mass and inertia and its movement down the primary pipe produces a suction, or a negative (1-5 psi) pressure rarefaction wave, that travels down the primary tube behind the pulse.


Fontana Nissan 350z Build

MotoIQ Staff Report

Fontana Nissan Racing put up some pics and text of the build of their Grand Am/Time Attack 350Z. It includes the build of their engine which includes a Cosworth 3.8L VQ35 stroker. For the link to their blog, check out my left navigation bar (I feel lazy today). Click here for the FONTANA NISSAN RACING TECHNICAL CORNER. They cover the in house build of the Cosworth 3.8L VQ bottom end, the chassis, and custom body panels. Chris and Jackson also developed the intake plenum and headers on their own, but they aren’t going to tell you all of their secrets. Jackson and his crew have been building race car...



2008+ Subaru Impeza STi Parts You Need

Something’s been getting in the way of my blogging: life. For now, here’s some bad ass parts you need to have for your 2008 and newer Subaru STi:

Cosworth S2D Dual AVCS 278°-10.7mm IN/274°-10.0mm EX Camshafts

Project Silvia lead wheel bearing storyProject S13 Silvia: The official guide to not screwing up your wheel bearings like I did.

by Dave Coleman

The first one died after an ordinary day at the Streets of Willow Springs. Rolling to the trackside gas pumps to satiate the car's bottomless thirst for petroleum, there was a nasty growling noise. Turning right made it go away. Turning left made it get worse.


Project Silvia black spray paint story

Project Silvia: Once we went black, there was no going back.

by Dave Coleman

Achieving a passable paint job with a spray can is not nearly as simple as you might imagine. Here are some tips:


Jim Wolf Technlogies Ultra light 370z flywheel on right, stock Nissan 370Z flywheel on left

Testing Jim Wolf Technologies Ultra Light Flywheel and Heavy Duty Clutch- Will it Work With SynchroRev? (New Video!)

By Mike Kojima

From a performance standpoint, the Nissan 370Z probably is one of the best candidates for performance improvement from a flywheel because of its extremely heavy stock clutch and flywheel. The stock flywheel weights a stout 32 lbs, the pressure plate 16 lbs and the clutch disc 3 lbs. That’s 51 lbs of rotating weight that must be spun to speed at the end of the crankshaft! Why is the stock 370Z’s flywheel so weighty? In an effort to reduce NVH (That’s engineers speak for Noise Vibration and Harshness) to extremely low levels, Nissan made the stock flywheel very heavy. The heaviness of the flywheel helps to smooth out power impulses of the VQ37VHR engine.

From our sister site

Stillen Gen 3 Nissan 370Z air intake

motoIQ Tech Exclusive! Stillen’s Gen 3 Nissan 370Z Air Intake, Tested!

By Mike Kojima

Stillen’s air intake came with some large power claims and we were skeptical.  We had tested several other 370Z air intakes and had noted either small or no gains at all.  The stock 370 has a really efficient air intake to begin with.  The engines intake plenum is fed by two generously sized throttle bodies leading to twin intake tubes, twin mass air flow sensors, and two large airboxes with big filter elements both sucking cold air from in front of the core support.  It doesn’t get much better than this.  Our opinions were solidified by the fact that some air intake companies have given up on the 370Z after not getting any power gains or these ones that have made it to market have gotten very small gains if at all.

motoIQ Tech Exclusive! We Evaluate SPL Version 3 Rear Multi Link Arms 

MotoIQ Staff Report

If you drive a Nissan S13 240SX, S14 240SX, S15 Silvia, Z32 300ZX or R32 GT-R and do some serious track work, you have probably been frustrated by the lack of adjustment range of the stock links. You have also probably experienced the awful twitchiness of the rear suspension. This is largely due to the huge amounts of soft squishy rubber in the many bushings of the multilink rear suspension.


ASP Nissan SR20DE header

Tech Exclusive! Header Design Part One

By Sarah Forst

A header is one of the first bolt-on modifications most tuners undertake but there are many factors involved in how to choose the best header design for your ride.  Let’s get into the detail behind header design and how to choose what will work for your ride!  Part 1 of this article will discuss the components of a header and the materials used to manufacture them.  Part 2 will go into detail on how a header makes power and what design will produce your desired powerband.


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