Latest Articles

Cosworth Big Bore Head Gaskets for Sleeved Blocks

by Eric Hsu

Did you know Cosworth offers big bore gaskets for sleeved blocks? Look inside for pressure clamping load test results and imprints for Cosworth vs. other head brand head gaskets.

twin disc carbon carbon clutch

Clutch Technology Part Two, The Clutch Disc Friction Material

By Mike Kojima

In our first segment on clutch technology we discussed the pressure plate and how it works.  However the pressure plate is only half of the equation when it comes to clutches and how they work.  We cannot ignore the all important disc. The clutch disc is such a simple device, yet it has a significant responsibility, the responsibly of transferring the engine’s torque to the ground. It also controls most of the clutch’s driveability characteristics. A disc can be the difference between a clutch that is grabby, chattery and nearly impossible to drive on the street to one that is butter smooth. The disc can also make all the difference between a clutch that slips and burns up when the boost is turned up or the nitrous hit, to one that grabs and holds the power.

Read Part One about how the clutch pressure plate works Here!


Annie Sam 3 wheeling

The Ultimate Guide to Suspension and Handling Part I: Wheels and Tires

by Mike Kojima

Horsepower is sexy and chicks dig it, at least a lot of meatheads think that way. Making horsepower is relatively easy. A lot of competent people know how to make power, lots of it. Until drifting became the rage in this country, handling and cornering prowess was for geeks, the road racing elite and autocrossers. Handling was for dweebs that raced around cones in parking lots, or loners prowling canyon roads at night, not for cool people in the scene.


EFI 101, Basic 4-Cycle Engine & ECU Operation and Tuning Rhetoric

by Christian Krahenbuhl

Automotive engineering involves a series of compromises. The compromise of designing affordable, durable, and fuel efficient engines that are enjoyable to drive while meeting modern emissions regulations has made the job of EFI controls very complex. Afford-ability and durability are concerns because manufacturers and consumers have limited resources. An engine designed to use some super metal like unobtainium (Uo and atomic number of 666) would be ideal.


Mazdaspeed3 SEMA

Wrench Tips #8 The 1-Page Service Manual

by Dave Coleman

Your weekly helpful hint from the MotoIQ garages. Enjoy! 


Sarah Forst

Ask Sarah

By Sarah Forst

I know back pressure is bad. Everything I remember about high school physics and everything I read over the years from SCC and Honda Tuning tells me back pressure is bad. I made that statement the other night at the pub to a friend. I found myself trying to make the argument without any scientific facts. He drives a 5 year old Mustang GT and claims he needs back pressure for his engine to work. He claims to have dynoed it with open headers and it lost power.

Got a Tech Question?  Email Sarah at


The Dog II

The Dog II

By Sarah Forst and Mike Kojima

Photography by Jeff Naeyaert & Steve Mitchell

Racing, performance, Nissan Sentra and basket case are not words that usually go together. This is a story of how a sophisticated race car was built from a pile of parts with a double dose of hard work and intestinal fortitude.


MotoIQ Project Aprilia SR50

Project Aprilia SR50: 100 MPG Madness Part 2, Engine Internals

By Mike Kojima

In our last edition of Project SR50, we had reached the limits of simple bolt on modifications which left us with a nicely running Scooter, capable of just over 50 mph with acceleration good enough to keep up with traffic and 115 mpg. With more time, we are really taking a liking to the refined Aprilia SR50, which rides, handles and brakes better than any scooter in this displacement category. We also like its sporty looks. The SR50 is the king of urban commuter scooters and we are going to take it to the next level.

See Part 1 Here!


Nissan Silvia S16?

Merry Christmas From Nissan!  New S16 Silvia?  Oh God We Hope Not!

MotoIQ Staff Report

It is rumored that the new S16 Silvia will be front engine and rear drive which is good but it will be powered by a 1.8 liter turbocharged engine with a class trailing power output of 200 hp.  Come on Nissan, with a turbo you gotta do better than that.  It has been our contention that Nissan has forgotten how to build a proper 4 cylinder engine ever since the demise of the SR20DE and its variants. 


Fastbrakes Nissan 370Z two piece rotors

Fastbrakes Nissan 370Z Superlight Rotor Upgrade!

MotoIQ Staff Report

Big brake upgrade specialists, Fastbrakes is pleased to announce their upgraded high performance super light two-piece rotor for the Nissan 370Z Sport Models with the Akebono 4 piston caliper. Although the 370Z is blessed with great brakes, they can be made better.


The Dog II Nissan Sentra

UPDATE:  Fairmont Butte Motorsports Park New Website

We got an email this weekend from Thomas Malloy, the main man behind the new Fairmont Butte Motorsports Park which is proposed to be constructed just northwest of Lancaster in LA County.  Malloy Is pleased to announce their new website which they recently launched at  There you'll find more info on the proposed location, track maps, rendered photos of what they want the place to look like and most importantly how you can help get this place built!  MORE


Mazdaspeed3 SEMA

Wrench Tips #7 The Box-End Breaker Bar

by Dave Coleman

Your weekly helpful hint from the MotoIQ garages. Enjoy! 


Annie Sam at Industry Track Day 5 12/20/2009 at Willow Springs

Industry Track Day 5

MotoIQ Staff Report

Photography By Steve Mitchell

On Sunday Dec 20th Mackin Industries, the people who import Volk wheels held their 5th semi annual Industry Track Day.  This is a semi-private invitation only event for people who work in the performance industry to bring out there personal cars to play.


Aston Martin One-77 Goes 220mph+

by Eric Hsu

Aston Martin goes over 220mph with the Cosworth designed and built 7.3L V-12. Click the image above for more details.

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