Holley 502-6 670 CFM Replacement Throttle Body
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Although I did not need to tune my truck, I noticed no difference in acceleration or power. Increasing the fuel pressure is not a good idea. The o- More than 16 psi is the limit for the rings around the injectors. You could also use the fuel pump as a fire extinguisher. I suggest upgrading the computer's prom chip to a high-performance one.
It includes everything you'll need to get started.
I did mine a few years ago, but you'll need to clip the ends off and mate them to the Holley wires once you get in there and look. Don't worry, it works fine; however, you must use it with the matching Holley manifold or it will not function properly.
We should put on a V10 from 1987 with a 5 cylinder engine. 7 engine.
Selected User Reviews For Holley 502-6 670 CFM Replacement Throttle Body
I'd like to clear things up! Don't be fooled by Google or the internet's negativity. Love it. There is a significant difference. The 88 Silverado is back on the road and performing admirably. br>br>Everyone has a point of view. Some people need to realize that this product requires a high-performance application, and that if you're replacing the OEM, you should be careful. Everyone has their own philosophical and biased beliefs, so don't believe everything you read. br>br>My truck runs great; the only problem is that it has a high idle when parking after shifting to OD and slowing down. Don't freak out, and I'd have it installed by someone who actually reads the instructions and understands that it needs to be tuned, and that it's not always the fuel pressure or MAP sensor, nor is it something absurd. After a few days and more air flow, it settles down with the chip. I put a throttle spring on until I can adjust the tps because I'm on crutches right now and learning that way isn't possible. It's what guys do, so we're all tinkering with stuff. It's good enough now, and as my ex used to say, I can't leave something alone until it's perfect or I break the sh$t out of it and bitch, but damn, when it was good, it was great! Lolbr>br>Hint: look at the tps adjustments on Holley's website for some issues; also, this is larger than stock TBIs, so more air is required because factory air pans are designed for lower cfm applications. br>br>Another hint: this is considered a high-performance street application. Make a chip investment. I'm the owner of a hypertech company. 128101br>br> The removal of my o2 pump messed up my ecu, causing my gas mileage to drop from 16. From 17 to 18, the city 5 mpg on the highway, 13 mpg in the city, and 14 mpg on the highway The 5 hwy, as well as tbi mods, aren't always what they appear to be, especially if your fuel pump is acting up. (I'm running a flipped pan with a spacer, pro chip, o2 pump, and all emissions controls, 700R hp jasper with 350 hp jasper 5. ) 7l) I replaced all emossions modules, the ECU, the o2 pump, the ac compressor, the steering pump, the 180° thermostat, the oil pressure sensor, the temperature sensor 2x, the 02 sensor, the plugs, and the wires before finallybr> CFM 670 and the fuel pump assembly br>br>To summarize, my truck performs better. The next day, I made the following changes: br> Had to fix an exhaust leak, replace the manifold studs, and adjust the airflow with a new high-flow system. More than factory air is going to be required. It's a badass, and I adore it! br>br>2 month updatebr>16 mpg at 95 mph while playing. Rough idle programs on the chip are no longer active. Play around with the tps to get a feel for how you want it to drive, and keep in mind that you're currently running two spacers. The performance chip upgrade system should be avoided at all costs. On shift points 1 and 2, you're going to have a lot of trouble. I'm going to get a new hypertech computer. Later, on 128101, To put it another way, when my friends in BMWs and sports cars ride in the dark, they scream, and now everyone wants old school muscle. Thank you so much, Holley!.
It is very simple to set up. I can hear the engine breathe a lot better now, and it sounds and looks a lot better.
Adapted for a non-supported application that performs admirably. Holley's tech support was prompt and extremely helpful. In comparison to stock TBI, this is a huge improvement.
very nice.
For your late model Chevy, this Holley TBI is a nightmare. In order for this TBI to work properly with your vehicle, you must send Holley your ECM. It'll cost you a lot of money. Prior to the sale, their techs will not tell you that Holley will need to reprogram your ECM. If you don't get your calibration done, you'll have to change your pre-sets. Timing ranges from 0 to 18 degrees. This results in a variety of problems that cascade. Then, when you connect the advance timing connector to your vehicle's computer, you start having issues like phantom hesitation, intermittent stumble, high oil pressure, high idle, lean condition, and so on. Buying a remanufactured unit or going to a local salvage yard and rebuilding it yourself is less of a hassle. Stay with AC Delco parts if you're going to rebuild it yourself. Keep in mind that the injectors are oriented in both directions (R/L). Viton o Rings are a great option. They have a longer lifespan.
This product was purchased as part of a larger project to remove the smog pump from an '88 Chevrolet Silverado 4x4 350 SBC. 2 to 1 cat, mid-length headers, and a 3 inch Flowmaster in the back. On an improved JEGS distributor, I switched to a three-wire O2 sensor, lowered the thermostat to 185, and set the timing to 6 BDC. coil. So that's the bottom line, stock heads, and cam. The Holley Pro-Am was my first choice. Because the stock intake and a competitor that starts with an "E" have 1 11/16 inch bores, whereas the Holley has 2 inch bores, I chose the Jection intake. 42% more surface than previous years! I now have options for the future after installing the larger bore manifold. The installation, on the other hand, was a pain because the front of the intake manifold had to be ground down a little. a few tenths of a percent The fuel lines must be stretched to clear stock accessory brackets, and the cables bracket must be reworked so that your accelerator, cruise control, and, most importantly, TV cable all function properly. You'll quickly burn through a car tranny if you don't get the TV cable right. br>br>Anyway, you'll notice a difference as soon as you install headers, intake, and ignition; the only thing left is fuel delivery. TBI is an acronym for "traumatic brain injury. " I considered upgrading the stick unit, installing big block injectors, and fiddling with the pressure, but rather than messing with all of that, why not spend a little more ($500 instead of $350) and take advantage of the Holley TBI's larger bore? The real difference is that the stock TBI has a flow rate of around 450 cfm, whereas the Holley 502- has a flow rate of around 500 cfm. 670 cubic feet per minute! Again, 1 11/16 bores stock vs. 1 11/16 bores custom. Holleys with two-inch bores. It will use the same amount of gas as before at cruising speed, but if you stomp on it, it will use twice as much. With my Holley 650 Spread Bore Double Pumper, it was like going back in time: )br>br>The installation's only drawback is: The truck started, but it was severely overfueled when I started it. The entire exhaust system is soaked in water. I looked up everything I could on the internet about different fuel pressures and how to set them. Definitely a case of overfueling. The truck started running fine after I moved the vacuum line for the MAP sensor from the factory location on the back to a manifold vacuum port on the front to correct Absolute Pressure issues. Make sure both ends of this critical vacuum line are secured with hose clamps, and spend some time setting up your idle and Throttle Position Switch. You'll need a digital voltmeter for this. It may appear difficult at first, but once you get the hang of it, it's a piece of cake. While the connector is connected, insert the meter probes into the back of it. They're designed in such a way that you can. So, how does it work? br>br> Up to" 25% more hp is advertised by Holley advertised by Holley advertised by Holley advertised This was the final, icing on the cake, and it allowed everything else to start working at its full potential. This 350 now has incredible air/fuel flow, and it's all thanks to the stock TBI heads and cam. The factory claims the '88 350 has 210 horsepower, but after removing unnecessary parts, upgrading the headers/exhaust, and installing this Holley intake and injector unit, I've gained anywhere from 30-45 horsepower. 40% (I hate to say anything more) and you can really feel it, there is no doubt about it. My 210 hp 350 is probably closer to 275 hp, give or take a few hp. I set a goal of 300 points, and I believe I am close to achieving it. I despise making educated guesses, but I'm looking forward to meeting you at Open Track Day! )br>But, more importantly, the 350 is rated at just over 300 ft/lbs of torque, which it now has in spades. The stock cam/heads combo is already very torquey, but don't expect to go much higher than 4800 rpm. However, between two and four grand, you get a great powerband, and as long as it has enough room to breathe, it will settle down on its peak torque and stay there. We have a mountain pass (Stevens Pass) with a couple of miles of steep grade and a couple thousand feet of elevation gain. You get to watch the speedo drop for several minutes with your foot on the floor, and it really distinguishes the men from the boys. It was well worth the money when I cranked up those twin two-inch TBI bores to WOT and listened to the music of the headers and three-inch exhaust. This Holley Improved TBI is something I would recommend, but only as part of a larger upgrade package. You will not be disappointed.
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