Frequently Asked Questions

Quick Guide

Does the Wrenchrat Turbo System have an EO (executive order) for emissions?

No. Wrenchrat Twin Turbo systems are for off road use only, or for use in states that carry no emissions requirements.

Does Wrenchrat Twin Turbo Systems offer a turbo upgrade for built engines?

Yes, please contact us so we can properly size the turbo’s to your setup
Is there tech support if I have a question or a concern?
Yes. Contact Wrenchrat Inc. if you have any questions or concerns.  Wrenchrat can be reached at (509)462-2934, Monday-Friday 9 am to 5 pm PST.

What comes standard with the Wrenchrat Twin Turbo System?

All Wrenchrat TT Systems come standard with 100% stainless steel piping, 2- turbochargers (size and manufacturer depends on system and options), 2- wastegates, a blow off valve (size and manufacturer depends on system and options), all the hardware necessary to install the kit. You can view the entire parts list for each kit in their respective kit pages by going to the turbo kits link in the navigation to the left of the page.

What if I am missing a piece from my purchased Wrenchrat TT System?

We strongly suggest inspecting your kit upon receiving it. We are human and make mistakes, so please inspect the kit upon it's arrival, and if there is a problem, please contact us immediately so that we can resolve the problem.

What is the difference between a turbo and a supercharger?

This is a very common question, but it's not one that's very widely understood. The differences between superchargers and turbochargers are these:
A supercharger is driven (spun) by a belt that is connected to the crankshaft via a pulley. This pulley uses the rotation of the crank to drive the belt and spin the pulley on the supercharger, which is connected to a set of gears that have "stepped up" ratios. This means that they spin the impeller/rotors a certain amount faster than the pulley itself is spinning. This is how it produces boost.
A turbocharger, on the other hand, is driven off of exhaust gasses produced by the engine. This in turn spins a turbine which is connected to an impeller by a shaft, which creates boost.

What is Turbo Lag?

The term Turbo Lag refers to the time before the turbine and impeller in the turbo are spinning fast enough to start creating boost. Our systems are designed to be very efficient, which reduces the amount of time that it takes the turbo to spool, thus reducing lag time.

What options does Wrenchrat TT Systems offer for its kits?

We offer upgrades to larger turbochargers and Ball Bearing turbo options. Complete lists of upgrades, and their respective costs are available in each kit page.

Will I need my car to be Dyno tuned after installing a Wrenchrat TT System?

Yes, we strongly recommend that the car is taken to a dyno facility immediately after installation of the kit in order to be tuned by a professional. This will help prevent any engine damage from occurring when the car is subjected to boost, and to assure that the car is tuned to make the maximum amount of power.

Do you sell turbo components separately?

Yes. We sell most of the major components of the turbo kits separately.  Just call or email us for details.

Do the modifications I have already done to my engine have to be changed?

It all depends on what you have done.  Most engine modifications will work just fine with a turbo kit.  Some examples of modifications that may have to be changed are high compression pistons, exhaust headers, many nitrous setups and superchargers (obviously).

Why do you send all systems as tuner systems?

With the many different factors involved including engine and elevation, it is best to have the car tuned by a professional on a chassis dyno to ensure a proper setup. If we were to send out one blanket tune, it is possible that either your setup wouldn't make the amount of power that it is capable of, or your engine could be damaged because of the different conditions.

How does a wastegate work?

A wastegate is mounted in the exhaust plumbing before the turbocharger.  A wastegate functions as a boost regulator, diverting exhaust gasses around the turbo once the turbo has reached the desired boost level.  They are simply a large valve backed by a spring.  Once the exhaust gas has reached the capacity of the spring the valve starts to open, diverting the exhaust gas around the turbo and back into the exhaust and out the tailpipes.

What type of exhaust should I run?

The main item here is mufflers.  You do not want chambered style mufflers like flowmasters.  You want a flow through type muffler like the dynomax race magnum or any other straight through design muffler. It has been said that too big of an exhaust on a turbo car is just right.  There really is no overkill here.

Which gears should I get?

Turbochargers rely on exhaust gasses to drive the unit.  Useable Exhaust gas is created when the vehicle is under a load.  This is the reason many people recommend 2.75:1 – 3.55:1 rearend gears for a turbocharged street car (depends on tire diameter and transmission gear ratio’s).  These less aggressive gear ratios place a higher load on the car for a longer amount of time per gear.  Of course for a straight drag car you want to pick the set of gears that puts you in your powerband for every gear and so you are passing through the traps at about redline in your final non OD gear.