MotoIQ Tech

anti lag rocket beyond the dyno

External Combustion Rocket Anti Lag System + JDM Spec C Impreza STI

By Eric Hsu 

The external combustion anti-lag "rocket" combustor was used on the factory Prodrive built WRC STi Subaru cars to improve the EJ20 engine's inherent mediocre torque and engine response. The rocket is so good that a version of it is still in use today in the 2012 Japanese Super GT GT300 STi BRZ which also uses an EJ20. Last time I wrote a teaser article, but this time we'll take a look at some of the details of the rocket combustor anti-lag system as it applies to my buddy Ben's JDM Impreza STi Spec C street car over in the UK. 


 

Tech Tip: How to Fix a Broken Mazda Door Handle

by David Zipf

It is important that we start off this Tech Tip be noting that it mostly applies to Mazda 3 owners, but also likely applies to 5 and 6 owners as well.  Mazda built the doors of all of these cars in a similar way.  If you own one of these vehicles (specifically the first generation from 2004-2010 or so depending on the model), you WILL have to deal with this problem at one point or another.  At some point your door handle WILL break, and you WILL have to replace it.  This will be a 100% failure rate over time and if you fix it early, it will make your life a bit easier.


 

AEM AQ1 - Installing & Setting Up the AQ1 Data Logger

by Ramitha Edirisinghe

In Article 1 we went over the features of the AQ1. In Article 2 we showed the power behind the data logging. In this final section, we’ll go through our installation of the AQ1 into the Jager Racing car, and some lessons we learned in the process.


 

Project E46 M3: Part 18 – Project M3 vs E90 M3 V8

by Pablo Mazlumian

We were pleased with our S54 3.2-liter in stock form, and the goal was to bring it up to V8 M3 performance. Was a 12% power improvement and 90-lb fat reduction enough? Find out inside! We test them to speed and in the quarter-mile. We also compare them from 30-100 MPH in third gear to compare low- and mid-range torque for you track guys! And why not--we even throw in a Mustang GT 5.0 in there...


 

Performance Car Engines That Suck- The Porsche M96

by Mike Kojima

A few months ago we did an article on 5 performance car engines that suck. This story was highly popular, and we have had many requests for more. So here we go, in more detail, the next performance car engine that sucks, the infamous Porsche M96 engine.


 

10 Ways To Prepare Your Car For Spring And Summer

by Pablo Mazlumian

Most of us have a daily-driven vehicle that sees year-round driving. In an area where the temperature delta can exceed 100F in a given year, that starts to play a significant role in the vehicle’s wear and tear, as well as fuel economy. We’ve compiled 10 things to consider when readying your car for the upcoming warm season. Doing these things will not only ensure better fuel economy and overall performance, but increased life of the vehicle itself.


 

Project E46 M3: Part 17 – The preferred exhaust setup and more AEM tuning by MKC

by Pablo Mazlumian

Life would be a lot easier if we'd stayed with the stock headers, but when we tested our VAC headers in Part 3, the increase in power was too much to let go. Since then, we've tried different header-back systems but they either were too loud, droned at low RPM, or didn't fit all too well. Today, however, we think we've found something that works great and doesn't break the bank. Dynos graphs and video clips inside!


 

Building the Naturally Aspirated Honda K Engine! Part 4- Burns Header and Tuning

By Mike Kojima

If you have been following our previous articles of our build of the naturally aspirated K24, we built the engine with the objectives being to build an engine that could run reliably in a high downforce, high grip chassis, have a wide powerband and run on California 91 octane pee water gas.  


 

Industry Insider: A Tour Through Aeromotive Fuel Systems

by Pablo Mazlumian

We bring you a MotoIQ-exclusive tour one of the fuel system industry's greats.  We get to learn some of Aeromotive's secrets to success, and even get to poke around some of its professional racecars!


 

Subaru Clutch Forks Cracking Under Pressure?  Say It Isn’t So!

by Eric Hazen

Subarus have roamed the streets, tracks, and dirt for decades, with hundreds of thousands of upgrades available for nearly every aspect of these beloved cars.  Yet, one crucial part seemed to be passed over- the clutch fork! The clutch fork is Subaru’s Achilles heel. The clutch fork’s job is simple - disengage the clutch when you want to change gears. However, the stock part is prone to breakage and premature wearing of the pivot, especially when a performance clutch with higher clamping forces is used. 


 

TESTED: Continental Tire ExtremeContact Sport

by Billy Johnson

“Same level dry performance as a Michelin Pilot Super Sport”. That is a HUGE statement by Continental when the PSS is hands down the segment leading benchmark.  Continental is extremely proud of their brand new ExtremeContact™ Sport tire that was just released earlier this month as a replacement for their ExtremeContact™ DW tire.  We logged nearly a thousand miles on the new Sport in both the wet and dry, and put it up against the outgoing DW in a back to back test at Palm Beach International Raceway to see if it lives up to Continental’s claims.


 

Project Viper GTS: Part 9 – RareFab/Roe Racing Oil Pan Baffle Kit

by Billy Johnson

Due to the high capabilities of the Viper, a huge strain is put on the factory oiling system on road courses and at the strip.  This can cause oil starvation and a spun rod bearing.  Using modern rubber can increase this risk, especially for 1996-1999 Gen-2 Vipers which have arguably the worst oil pan of any generation of Viper.  To combat this problem, we upgrade to the larger 10-quart oil pan and windage tray from the 2000-2002 Vipers and install RareFab/Roe Racing’s race-proven Oil Pan Baffle Kit.


 

Wrench Tip: The Ultimate Oil Filter Wrench That You Need to Buy Right Now!

by David Zipf

You've been using the wrong tool to change your oil filter. Read our latest Wrench Tip to find out what you've been missing out on!


 

Turbo Tech: Internal vs. External Wastegates

by Khiem Dinh

Photos Courtesy of Bren Tuning and Killer B Motorsport

Every production street car comes with internally wastegated turbochargers. There are many reasons for this, but what is given up in torque and power compared to an external wastegate configuration which dumps the wastegate flow separately from the turbine exhaust flow? Luckily for us, Bren Tuning performed some testing on a 2015 Subaru WRX using exhaust manifolds from Killer B Motorsport configured for both internal and external wastegate configurations.


 

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