Welcome to Harris Performance, the home of TBI CHIPS throttle body injection services. So Just what is TBI, stands for Throttle Body Injection used by GM in the early 80’s through 1995.  The early systems from 1982-1986 are just too old to do much with.  1987-1991 were still SLOW computers with tiny chips limiting what can be done with the system.  However, these systems were primarily used in the 1987-1995 pickup trucks and so they still work fine for low rpm truck applications.  If your looking to run a motor over 5000 rpms then you really need a different type of injection and the cam choice needs to reflect that rpm max as well or your just asking for a nightmare. Many still out there with TBI vehicles needing help getting more modern power levels and fuel mileage from older GM throttle body injected vehicles without going to the process of rewiring the vehicle to run a more modern fuel injection system. While TBI has a few crippling limitations it is still possible to pull a little over 1hp per cubic inch from these vehicles but requires a LOT of good planning and implementation to pull that kind of power level off and I am here to help provide that advice as well as support for the computer system to help you get there.

I have also added a paypal Donate button on the left as well.  I have had many people ask about a donation to help pay for some of the knowledge i have placed on the website FREE of charge.  No obligation at all but if you want to toss a little my way.  Homes For Sale The Dunes Yuma AzI am also going to test a Comments section out as well and see how that goes.Pool Table Movers Midland Tx There's power hidden in your stock late-model Chevy pickup just waiting to be unlocked. Balterio Laminate Flooring Reviews UkAlthough that throttle-body injection (TBI) engine is disguised as just another pedestrian small-block Chevy, with a weekend's worth of wrenching and a few affordable parts, you can easily turn your truck from daily driver into a better performer.

Recently we decided to see just how easy it is to transform a stock '91 Chevy pickup into something with more performance. After all, just because it's your daily transportation doesn't mean it has to be boring. So with our buddy Patrick Peterson and his '91 Chevy shortbed pickup, we set out to see how many extra horses we could unleash with a weekend's work. We chose an after-cat exhaust system from Edelbrock, a K&N air-filter system, March pulleys, and some pieces from Jet Performance.Before we laid a wrench on the truck we wanted to see just how much power the stock 350 produced. So we headed out to our friend Mark D'Anna's SuperFlow chassis dyno at Bottle Blown Racing in Camarillo, California. On the chassis dyno, Patrick's 350ci (5.7L) engine developed a respectable 164.5 hp at the rear wheels. Granted, this isn't bad for a stocker, but we felt we could find more power.If you've been reading CHP for some time, you know that the key to more power is better breathing, so we decided to tackle the exhaust and air-cleaner systems first.

We started with Edelbrock's RPM series Cat-Back system, which uses mandrel-bent stainless tubing for durability and increased flow, along with Edelbrock's muffler to make a little extra power. After removing the original exhaust system, the new Edelbrock kit easily bolted into place in about 90 minutes. We immediately felt the difference in power, and the truck now had a more authoritative sound.Next we wanted to improve the flow of incoming air into the engine. The stock air-cleaner system on TBI pickup trucks sources the air intake from the passenger-side fenderwell and feeds it into the stock air-cleaner assembly.To improve the airflow, we selected a K&N fuel-injection performance kit that uses a high-flow air-filter element and replaces the engine's stock air-cleaner intake tract with a low-restriction K&N filter assembly. The K&N element is also cleanable.We decided to reduce accessory drag and dress up the engine compartment at the same time with a set of March Power and Amp series billet pulleys.

The kit installed easily and the only problem we encountered was removing the factory pressed-on power-steering-pump pulley. To remove the pulley, we purchased a power-steering-pulley remover for about $60. They are also available from most rental yards. Don't try removing the stock pulley with a hammer, since that will typically damage the power-steering pump.To enhance the performance of our bolt-on improvements and provide the best on-board tuning possible, we contacted the folks at Jet Performance Products. In stock trim, the original computer chip manages the proper fuel and spark delivery, but with a high-flow exhaust system, better air intake, and low-drag pulleys, we wanted to optimize the engine tune. We installed one of Jet's Powertech 6-Pak chips, which allows one of six different settings that range from Economy to Stage 2 (the maximum performance selection requires 91-octane fuel). Finally, we installed a Jet Low-Temp thermostat and an adjustable fuel-pressure regulator.We eagerly wanted to see how much more power the truck produced with all the new performance parts installed.

The seat-of-the-pants performance definitely increased, but we wanted hard data. So we traveled back out to the dyno at Bottle Blown Racing. With the truck on the SuperFlow dyno, we watched as the numbers came in. At the peak, we added almost 20 hp to the rear wheels, but better than that, we had increased the overall torque curve throughout most of the rpm range by 5 to 15 lb-ft. So with a weekend's worth of work and some affordable parts, Patrick's truck now runs better, sounds stronger, and has improved its underhood image. This daily driver is now exciting and fun to drive. I'm going to tell you how to add horsepower and save gas with a Performance Filter System.You never need to replace the air filter again!This works with Fords, Lincolns, Mercurys, BMWs, Chevrolets, and most others.Now the average added HP is 7-12 HP, but you may gain more or less depending on your car or truck.If you want to do this on the cheap, I recommend Spectre Performance Parts.If you want to go all the way and pimp your car out, go with K&N parts.