FAQ on Modifying the Toyota Supra

Supra The Tk Society Sneakers, What does BPU(TM) stand for? (BPU(TM) is a trademark of SupraStore.com)

Basic Performance Upgrades. These modifications are: A full length three inch down-pipe (with or with-out high flow cats), 3\" (75mm) or bigger cat-back exhaust system, raised boost (18psi), and the required boost cut eliminator (GReddy BCC) needed to achieve that boost without activating the factory fuel cut-off at 14-15psi. These are the modifications that have proven to provide the best HP-to-$$$ ratio.

What does the + mean when someone says BPU(TM)+? And what is APU?

That stands for any additional power producing modifications other than the basic BPU(TM) modifications. One \"+\" refers to Adj. Cam Gears and under-drive pulleys, the second \"+\" refers to a Fuel controller, Supra The Tk Society Sneakers ECU upgrade, etc. For instance, a Supra with the BPU(TM) modifications, plus a front-mount intercooler, would be called BPU(TM)+. If you added cam gears to that, it would be BPU(TM)++, and so on. The \"BPU(TM)\" term is used until you have an upgraded turbo(s). Then it is referred to as APU, advanced performance upgrades. This designation pretty much covers every modification that can be performed.

What are the first engine modifications I should perform?

I recommend starting with raising the boost of the stock turbos to roughly 18psi. This will require a quality boost gauge and a boost cut eliminator (GReddy BCC). You will achieve 15 or so PSI with the stock Down Pipe in place. This will provide an addition of approximately 30rwhp. After those modifications are completed, it would be a logical next step to install the Down Pipe and Cat-Back Exhaust at the same time. You will now be at full BPU(TM).

What do all the various \"Free Mods\" do?

There are many different \"free mods\" for the Supra TT. I will cover just a few of them here. The ones I will cover fall into three categories, boost control, EGR disabling, and TTC or True Twin Conversion.

Three of the boost control mods are: Bleeder-T Mod, Clamp Mod, and the VSV Bypass Mod. Each of these modifications raise boost levels without the use of a boost controller. But you have to keep a close eye on your boost gauge, and Supra The Tk Society Sneakers make sure they are not allowing the turbos to boost too high (18psi is a safe level).

The next mods, are the true twin conversion mods (or TTC). This modification disables the Sequential twin turbo operation, and causes the turbos to run constantly in parallel (both on at the same time). This is supposed to allow for slightly better mid-range power (before the secondary turbo would normally come online) and allows for a smoother power band, without the abrupt boost increase caused by the transition from primary to secondary operation. However, this does noticeably decrease low-end Supra The Tk Society Sneakers power, and increases exhaust noise levels, and therefore may not be desirable on the street. Two types of the TTC mod are, the traditional TTC mod which includes 2 methods, wiring the actuators, or installing a one way valve, and the Electronic TTC mod (ETTC).

The last mod I will discuss is the EGR mod. This disables the Exhaust Gas Recirculation system, which is meant for emissions, and therefore, this modification is for off-road use only. This mod is supposed to prevent the super heating of the number 5 and 6 cylinders, which may cause burnt valves.

Article Source: http://EzineArticles.com/9214