Jump to content

4.3L questions

SportSide 5.3

Recommended Posts

SportSide 5.3 Enthusiast

SportSide 5.3

Posted
Posted

Hey guys,

 

I have a couple questions for you, so Im gonna go ahead and lay them out one by one.

 

-What forum do you high performance 4.3 guys hang out at?

-Who has added a custom exhaust?

 

I noticed the oxygen sensors are before the catylitic converter. So, gutting the cats won't cause any problems with the a/f ratio readings.

 

-What size tubing for the exhaust?

 

What is recommended for adding new piping up to the exhaust manifolds? I'd like to add a larger diameter pipe. Drill new holes in the pipe for the oxygen sensor to fit in? Any ideas?

 

-What program, or programming for '99 and '00 S-10's/Blazer w- the 4.3L? Hypertech the best out?

 

I think that's about all.

 

Thanks alot,

 

Kyle

Butch 02 Denali Enthusiast

Butch 02 Denali

Posted
Posted

Wester's does tuning for 4.3's, the few reports i've read have reported very good gains. I think if you go to the midsize truck forums, or forums for S10's and Sonoma's you will get much more info on the 4.3 than at the fullsize truck forums.

 

Try here http://www.chevytalk.org/threads/postlist....t=0&Board=UBB46

 

I had a Hypertech in my 98 Sonoma 4.3. Very slight gains in performance, I could hardly tell if it was in or not, and that was with the 93 octane setting.

  • 3 weeks later...
GLOCKM22 Enthusiast

GLOCKM22

Posted
Posted

S10planet.com-- I lived there before i traded my 4.3 sonoma on my new truck. Quickly, I will tell you: Get a K&N FIPK, NGK Tr6 plugs, Taylor racing wires, throttle blade mod, hypertech pp3(for shift points, firmness, rev limiter, and top end--dont expect gains from dual fuel tuning,dont install it). I went from 16.80's to 15.70's with the above mods. The FIPK is a must you will notice the gain immediately.

LikeaRock14 Enthusiast

LikeaRock14

Posted
Posted

S10forum.com is an awesome site, TONS of info for the 4.3 liter over there.

 

As far as performance, I've got a 91 4.3 TBI w/ a JET Chip, K&N Filter, and Spin Tech exhaust. It's not the fastest thing around but it's got some balls to it!

 

Spin Tech by far, is the best sounding exhaust for a 4.3, IMHO. Next to it would be the Hooker Maxflow. Spin Tech's mufflers sound awesome on smaller engines, and I'm very impressed with what it did for my 4.3, the sound is superb.

As far as pipe size goes, you CAN go with a " single, but that's the max for single. I've currently got a 2.5" w/ a 3" tip on mine, looks sweet and like Isaid, sounds awesome. 2 1/4" would be the max for a dual out.

If you would like I can send the clip to you via email. Just let me know!

 

Oh yea, with my JET chip and K&N, I noticed decent improvements all through the rpm range. And gained an honestmpg around town :crackup:

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • Chuck FB
      Gas Prices

      By Chuck FB · Posted

      Interesting, I suspect I would have fueled up in Lee Vining as the day prior I would have filled up either in Laughlin or near there and maybe again before I entered Death Valley and once out the other side late that evening as I kept on driving into the night up near Lee Vining. Next morning I most likely fueled up in LV before heading over Tioga Pass into ( as I refer to it as "Yose .... Mite" 😁 ). And again that was 19 years ago but the price then must not have jumped out at me like the 5 bill a gallon theme of nutty cult hippy country Big Sir or head so far up their rear Aspen. I'd be curious to know where the highest prices are in the lower 48, I probably would not be far off to guess somewhere in Cali forn ie. Coldfoot and Prudhoe bay may have those prices beat but that is a whole other world up there and when prices are more normal elsewhere that is about what they can be up there I believe in no mans land. Anyway interesting that the 395 corridor is hosing people and the thing is, its tourist season and its not like there are a lot of competition options when driving up that highway from what I could see. Yup, big ole Boaterhomes and various other RV's ahead and behind me at the Yosemite entrance gate and they have to get their fuel somewhere.  
    • Atlas
      Gas Prices

      By Atlas · Posted

      Those can be high, as well as the big California cities. The ones that will pop your eyes out are the 395 corridor on the Eastern side of the Sierra Nevadas. Lee Vining, $7.19 for regular and $8.89 for diesel is what the Google said right now.
    • newdude
      2020 Trailboss 6.2 replacement

      By newdude · Posted

      Correct.  2019-2021 model years are serviced by a different p/n.  19420611.  Recall 2021s use 19420611.   The recall engines 2022-2024 model years are serviced with 12740076.     The difference between 19420611 and 12740076 is GM changed injector size for 2022.  The injectors are smaller on 12740076 with smaller injector bores in the cylinder heads to match the smaller injectors.  So you can't install a 19420611 in a 2022-2024, and you can't install a 12740076 in a 2019-2021.     Both engines are the replacement engine p/ns that are in the L87 recall.  So both of these are the updated engines.     Here's a version of the L87 recall with the p/ns for all the parts needed.    RCRIT-25V274-7075.pdf   Note it shows 19420611 and 12740076 with an asterisk to a footnote "Use the VIN and the GM Electronic Parts Catalog (EPC) to determine which part to order if two or more part numbers are listed for the same part, as it may vary by vehicle options."    
    • 2017Z
      2020 Trailboss 6.2 replacement

      By 2017Z · Posted

      Looking for advice from this group. Took my flawless 2020 6.2 TB to an unnamed shop for routine rear brakes and oil change. Tech forgot to put oil back in after the full service and needles to say, destroyed my engine.  It’s all on their shop video so they are responsible.   I had my Chevy dealer do the analysis and they confirmed its compromised and said engine replacement. The manager said they only get GM reman engines from GM with full 3 yr warranty and the one they would put in is not same as what’s they are swapping out on 21-25 for recall.    I am looking for advice why that would be a different engine because obviously I had the good 6.2 year and replacing it has my concerns with that recall for 21-15   Also what’s the pros and cons of accepting the engine swap vs telling the shop that bricked the truck to pay up so I buy a new truck. I’m concerned about stigma resale eventually if I just decide to get rid of it after the swap or other issues showing up after the swap out.  
    • GN2018
      AFM Disabler Question

      By GN2018 · Posted

      Just looked up my records.  I've never gone over 5000 miles between oil changes.  At 46K miles, I have 10 oil changes.  I hope that will help.  I also installed the disabler last year.  I've still had a few times when it didn't seem to engage (which I can tell because the start stop feature kicks in), but for the most part, I think it's working.  For some reason, GM did not include the number of cylinders running in the information screen like I had on other models.  In my Cadillac, it shows me when it's running on 4 cylinders on the fuel milage screen.  I can't find that on my '21 Denali.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...