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Car Forum / Driving, Maintenance, Tuning / 4x4 Cars / September 2004Modifying a TB setup with larger injectors???
Is there a way that a stock throttle body on a 1994 GMC K1500 350 can be modified with larger injectors? A bit more fuel with a ram air setup and headers should equate to a bit more snort, right? Any sources for getting parts of this nature? Looking for opinions and any advice that might be helpful. Thanks. Andy > Is there a way that a stock throttle body on a 1994 GMC K1500 350 can be > modified with larger injectors? A bit more fuel with a ram air setup and [quoted text clipped - 4 lines] > Thanks. > Andy A stock TB injector, and its computer system should be easily capable of handling the headers and ram air. > Is there a way that a stock throttle body on a 1994 GMC K1500 350 can be > modified with larger injectors? A bit more fuel with a ram air setup and > headers should equate to a bit more snort, right? Any sources for getting > parts of this nature? > Looking for opinions and any advice that might be helpful. 1) you install 'larger injectors' 2) the O2 sensor sees a 'rich' exhaust 3) ECM cuts back IPW (Injector Pulse Width) to return air-fuel ratio to ideal 4) you're back to Square One better course is to make sure fuel pressure is up to par, and change fuel filter regularly Gary is absolutely correct, tweak the rail pressure first (9-13psi), then read these articles: http://chevyhiperformance.com/techarticles/148_0307_tbi http://www.goingfaster.com/spo/modthel03.html  SignatureMad-Dog '79 Chevy K-10 Slightly modified http://mad-dog16.tripod.com -- > > > Is there a way that a stock throttle body on a 1994 GMC K1500 350 can be [quoted text clipped - 11 lines] > better course is to make sure fuel pressure is up to par, and change fuel > filter regularly Thanks to all for the replies and suggestions. I'm looking at the budget to try out some of this stuff. Andy > Is there a way that a stock throttle body on a 1994 GMC K1500 350 can be > modified with larger injectors? A bit more fuel with a ram air setup and [quoted text clipped - 4 lines] > Thanks. > Andy > Thanks to all for the replies and suggestions. I'm looking at the budget to > try out some of this stuff. [quoted text clipped - 8 lines] > > Thanks. > > Andy I've thought for a while about getting one of these to "trick" the computer into running more rich. Seems a little pricy for what you get though. Also, I run a MSD adjustable timing module. Its a slick deal that gives you a knob on the dash, allowing you to adjust the timing on the fly. When you choose to, you can run premium fuel, bump the timing up a little, and feel it pull noticably better. Conversely, if you get a tank of bad gas, or are towing, you retard the timing so it doesn't ping on you. Later, B. Brian: How does this MSD box work/mount? For my vehicle below, what special modifications would I need? I went to this link and there's two different types of units. Which would I need? http://store.wpsracing.com/msdadtimcon.html Appreciate the education. Andy > > Thanks to all for the replies and suggestions. I'm looking at the budget > to try out some of this stuff. > > Andy > > > > > Is there a way that a stock throttle body on a 1994 GMC K1500 350 can be modified with larger injectors? A bit more fuel with a ram air setup > and headers should equate to a bit more snort, right? Any sources for getting parts of this nature? Looking for opinions and any advice that might be helpful. > > > Thanks. > > > Andy > > I've thought for a while about getting one of these to "trick" the computer into running more rich. Seems a little pricy for what you get though. > Also, I run a MSD adjustable timing module. Its a slick deal that gives you a knob on the dash, allowing you to adjust the timing on the fly. When you > choose to, you can run premium fuel, bump the timing up a little, and feel it pull noticably better. Conversely, if you get a tank of bad gas, or are > towing, you retard the timing so it doesn't ping on you. > > Later, B. Hey Andy, Without running out to the truck to be sure, I believe it is this one. http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=164290&prmenbr=361 #121-8683 I can double check if you like, of just give Jegs a call. It was easy to install, you tap into a couple wires at the coil, power and ground the box, and run the wire and knob to the dash. It is CA smog legal too, or at least was a few years ago. I'll double check the info if you like, lemme' know. Brian. > Brian: > [quoted text clipped - 33 lines] > > > > Later, B. Andy, I checked under the hood, and yes, it is a MSD 8683. B. > Hey Andy, > Without running out to the truck to be sure, I believe it is this one. http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=164290&prmenbr=361 > #121-8683 > I can double check if you like, of just give Jegs a call. [quoted text clipped - 46 lines] > > > > > > Later, B. Brian: So, from what I read on this module, an MSD 6-Series, SCI, 7-, 8- or 10-Series Ignition Control.is used in conjuction with it, right? Is this worth the effort and money? The way your post reads, you're just using the timing module; what kind of results are you getting? Andy > Andy, > I checked under the hood, and yes, it is a MSD 8683. > B. > > > Hey Andy, > > Without running out to the truck to be sure, I believe it is this one. http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=164290&prmenbr =361 > > #121-8683 > > I can double check if you like, of just give Jegs a call. > > It was easy to install, you tap into a couple wires at the coil, power and ground the box, and run the wire and knob to the dash. It is CA smog legal too, or at least was a few years ago. > > I'll double check the info if you like, lemme' know. > > Brian. > > > > > Brian: > > > > > > How does this MSD box work/mount? For my vehicle below, what special modifications would I need? I went to this link and there's two > different > > > types of units. Which would I need? [quoted text clipped - 5 lines] > > > > > > > > Thanks to all for the replies and suggestions. I'm looking at the budget to try out some of this stuff. > > > > > Andy > > > > > > > > > > > Is there a way that a stock throttle body on a 1994 GMC K1500 350 can be modified with larger injectors? A bit more fuel with a ram air setup > > > > and headers should equate to a bit more snort, right? Any sources for getting parts of this nature? Looking for opinions and any advice that > > mightbe helpful. > > > > > > Thanks. > > > > > > Andy > > > > > > > > > > I've thought for a while about getting one of these to "trick" the computer into running more rich. Seems a little pricy for what you get > > > though. Also, I run a MSD adjustable timing module. Its a slick deal that gives you a knob on the dash, allowing you to adjust the timing on the fly. > > When you choose to, you can run premium fuel, bump the timing up a little, and feel it pull noticably better. Conversely, if you get a tank of bad gas, or > > are towing, you retard the timing so it doesn't ping on you. > > > > > > > > Later, B. > Brian: > So, from what I read on this module, an MSD 6-Series, SCI, 7-, 8- or [quoted text clipped - 9 lines] > > > Hey Andy, > > > Without running out to the truck to be sure, I believe it is this one. http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=164290&prmenbr > =361 > > > #121-8683 [quoted text clipped - 41 lines] > > > > > > > > > > Later, B. Hey Andy, The 8683 is a stand-alone unit. You just power it and tap into a couple of coil wires. I think it is very much worth the money, but I am also a gadget/tinkerer type of guy. I will reach up and tweak the timing as I drive. You can actually feel the truck pull stronger as you advance the timing. You'll just need to pay pretty close attention to the motor and it's sounds if you are running more advance than stock settings. As you advance the timing the moter becomes more suseptable to pinging, which can loosely be described as the fuel mixture exploding, rather than burning in a controlled manner. Prolonged severe pinging WILL ruin your engine, so you'll need to keep that in the back of your mind at all times if you're messing with the timing. That said, you can feel a little more power with better gas, and advanced timing. What that equates to in numbers I don't know... maybe 3 or 5 hp? Also, you could just skip installing the ignition control and advance your timing a few degrees from stock, and run premium fuel. But pay close attention for pinging. The convenience of adjusting for gas, load, driving style, etc. makes the MSD box very worth it to me. Hope this helps, Brian. Thanks for the info. > Hey Andy, > The 8683 is a stand-alone unit. You just power it and tap into a couple of [quoted text clipped - 18 lines] > Hope this helps, > Brian. |
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