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The one thing that I would question is fuel pressure. Probably a lean condition. Since it wasn't backfiring before, something changed. Tuning usually doesn't change, and I can't tell you how many GM application fuel pumps I've warrantied lately, no matter the brand. They're ALL junk...Denso, Delco, Spectre, Carter, etc. If the pumps aren't failing, the dang level sensors are.That being said, I don't remember if you put in a race pump or not.
Quote from: KensAuto on August 13, 2021, 01:00:57 AMThe one thing that I would question is fuel pressure. Probably a lean condition. Since it wasn't backfiring before, something changed. Tuning usually doesn't change, and I can't tell you how many GM application fuel pumps I've warrantied lately, no matter the brand. They're ALL junk...Denso, Delco, Spectre, Carter, etc. If the pumps aren't failing, the dang level sensors are.That being said, I don't remember if you put in a race pump or not.That's not it ken.I have a "Race/forced induction" fuel system in there. It has large lines and two very high capacity fuel pumps. One for normal and the second kinks in above 7psi fuel pressure.And here's another thingSince I had it supercharged, that was the first time I ever stuck my foot into the throttle that far for that long. I just don't hot rod around all that much
Quote from: Flyin6 on August 13, 2021, 11:50:47 AMQuote from: KensAuto on August 13, 2021, 01:00:57 AMThe one thing that I would question is fuel pressure. Probably a lean condition. Since it wasn't backfiring before, something changed. Tuning usually doesn't change, and I can't tell you how many GM application fuel pumps I've warrantied lately, no matter the brand. They're ALL junk...Denso, Delco, Spectre, Carter, etc. If the pumps aren't failing, the dang level sensors are.That being said, I don't remember if you put in a race pump or not.That's not it ken.I have a "Race/forced induction" fuel system in there. It has large lines and two very high capacity fuel pumps. One for normal and the second kinks in above 7psi fuel pressure.And here's another thingSince I had it supercharged, that was the first time I ever stuck my foot into the throttle that far for that long. I just don't hot rod around all that muchunderperforming injectors maybe?
Congrats Don. Apparently NSDQ applies to tuning as well. Sent from my iPhone using Tapatalk
Update: I have been using the stock transmission tuning now for weeks, driving 4-5 times a week. The shift out of first now happens almost immediately so the hard shift that used to be there is almost gone.ButWhen I use the towing mode that shift rises to a higher MPH and again, sadly, shifts hard to very hardSo I am putting a stop to all that. This week John at SS Transmissions is installing a rebuilt valve body with the Sonnax shift improver kit installed. Everyone who uses that shift kit loves it. The Trans-Go kit is absolutely NOT THE WAY TO GO! I guess it works well for sled pullers or drag racers or people who just don't care (The type who run "Rollin-coal tunes" or with no mufflers, you know, those without brains) but 99.999999999999999999999999999999999999% of everyone else likes the Sonnax stuff.Nuff said, that thing will be a part of the Burb's DNA as of Friday, this week.Moving ahead, the truck still feels like it has very little power. Granted, that is due in part to having 37" tires, and part to being heavy, but 600 horsepower ought to do something. After a conversation with John, he feels the fault lies heavily with the converter.So I called Monster transmission to talk that through. In a nutshell, the converter I have in the truck is all wrong for this application. It is rated for around 350HP, has a higher stall than factory and is more or less light duty.My heavy truck needs a lower stall converter, not a higher stall converter. It also needs to accommodate a lot more power, like the later diesel converters handling thousands of ft/lbs of power. After some discussion, I learned that the converter I am using will break or has broken and simply is overloaded in every area.They agreed to build me a fully customized billet converter with triple discs, anti ballooning welding and plates, and all the good stuff. They will warranty it for years to handle in excess of 900 HP.So for $1299, I placed my orderhttps://www.monstertransmission.com/-GM-Chevrolet-4L80E-Diesel-Torque-Converter--Thor-HEAVY-HAMMER--Level-2_p_16586.html
Are you no longer working with nick, or whatever the guys name is that did all of that dynoing fod you?
Hey, I learned to drive in a pinto wagon!
I agree monsters rep isn’t very good, circle d is top of the line
Quote from: stlaser on October 07, 2021, 11:00:55 AM I agree monsters rep isn’t very good, circle d is top of the lineI have missed something here. you can private message if you don't want to share on the open forum here, but also it's been 6 years since I was in their facility, training these reps face to face. I wonder if my graduating class moved on and the new batch is floundering?
What did you find out Don?Sent from my iPhone using Tapatalk
Not a bad choice but motors have gone up to. I am seeing 12v going for over 2k now, I paid 1k.Start looking!
I have an inexpensive 24v short block if someone needed or wanted
Quote from: stlaser on October 24, 2021, 03:15:36 PMI have an inexpensive 24v short block if someone needed or wantedI may be.I think I have a complete 12 valve VE pump engine, which would be the one I'd rebuild for the burb, but I have thought about building a 24 valve with a P-pump