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Carb jets?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by txguy, Sep 6, 2001.

  1. txguy

    txguy 1/2 ton status

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    Carb jets, where do ya get them? How hard are they to install? I have 85 Jimmy, I believe its the stock carb. Anyone know what came on the 305? Yeah, I know, bigger engine is needed, but thats not for sometime. Whats this about offroad jets?

    Also, those performance chips, most say to use premium gas, what type of results do you get with them using the cheap gas? I would imagine its pretty close using the cheap stuff, compared to using the premium gas.

    What brand chips are better? Do they really help that much?
     
  2. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Premium gas just has a little more "pep" or octane than regular gas. You can feel a slight performance difference with the higher octane gas. I noticed it was easier to get rolling with it. Hence, possibly better mileage. If you wanna be cheap with fuel than buy a geo or a moped or something. Higher octane should also be used with higher compression ratios, like 91 octane for 9.5:1 compression.

    <a target="_blank" href=http://www.geocities.com/bigkern76>http://www.geocities.com/bigkern76</a>
     
  3. txguy

    txguy 1/2 ton status

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    Over the years in other vehicles I have ran both high and low octane. Never noticed a difference in pep, or MPG. Now if I had all sorts of telemetry equipment, a dyno, and were to figure out my MPG over a period of year. I might notice a slight difference. But as far as day to day gasoline cost is concerned which is my reason for using the lower octane and why I asked the questions concerning the performance chips. And BTW thanks for your suggestions on future autos. Personally, I am going to buy another sports car next.
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    If your '85 has a carb with an electrical plug on it, without looking at my GM service manual, you may NOT have changeable, or at least common, jets. Any of the car CCC Q-jets (trucks were like C and 1.5 C heh) do not use a needle/jet assembly on the primaries, but honestly, I have not had one of the truck hybrids apart to know for sure.

    If no electrical plug, the primary jets are pretty easy to change, although secondary metering rods and hangars are much easier, and are more effective in power tuning.

    The jets aren't going to do much for you. Unfortunately, the problem IS the motor. Small motor coupled with heavy truck=slow.

    Forget about the performance chips, everyone I know that has used them has been more than just disappointed with them. If you aren't changing compression, stay away from premium gas. It actually hurts power (and is thus an expensive, polluting waste) on a properly tuned engine designed (like ours) for regular unleaded.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     

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