1616825 tuning for 383

[Texoma]

I’m currently working on what will pretty much be a clone of the gm ht 383, 64cc vortec heads, same cam as the ht383 and ramjet 350, should be below 9.3:1 compression with the pistons I will be using. This will be going in a 93 Yukon 4wd with 3.42 gears and a 4l60e transmission. The current pcm has the bdjy bin as the stock bin. I will be using a dual plane intake with a tbi adapter plate. I have a tbi that has been bored out to 46mm that I will be using on it. I haven’t gotten the injectors for it yet though. This will be my first time messing with any ego systems. How difficult will it be to get an engine running decently? I figured I would check to see if anybody has any pointers to get me headed in the right direction or any bins that may be close to what I need.

[dave w]

GM used two different Masks for the 4L60E see links below:

http://www.gearhead-efi.com/Fuel-Inj...Information-E6

http://www.gearhead-efi.com/Fuel-Inj...Information-0D

The stock TBI timing table is not optimal for a HT383 type engine. Link to a factory Vortec timing table: http://www.gearhead-efi.com/Fuel-Inj...-Throttle-ONLY!

Video on getting started with TunerPro RT, not exactly for TBI but provides very good overview. https://www.youtube.com/watch?v=rLRnRNapRN4

With a good understanding of TunerPro RT: the Wide Band O2 (WBO2) spreadsheet is very helpful for tuning: http://www.gearhead-efi.com/Fuel-Inj...g)-Spreadsheet

dave w

[Texoma]

Thanks for the links. Should get me started. I will have a large learning curve on this project for sure.

[Daveo91]

your build sounds very similar to mine: 383, vortec heads, GMPP spread-bore (q-jet) manifold for vortec heads, TBI adapter plate, 46 mm TB, etc in a '91, 3/4 ton 4x4 burb. Only differences are cam and trans: I'm using a stock vortec L-31 cam (and the complete roller valve train that came with it) and my burb has a 4L80e. Tuning has definitely been a challenge for me. Lots of battles and trial and error, but the help on this site is awesome. Lots of knowledge and experience here. Almost four years later and I've finally gotten my tune 80% to where I want it and the truck is running the best it ever has in my eight years of owning it. I still am working on timing. I agree with Dave W - go with the vortec timing table to start out with. You won't be able to use my bin files directly since we have different trans, but perhaps my fuel tables will be of use to you. Let me know.

You may be able to benefit from reading about some of my problems in the last few years by searching threads I started. Make sure you read to the end!

[Texoma]

I will check your post out. The cam in my build is also a roller, ended up purchasing all the components to convert it. Thought about trying to find a vortec motor to rob parts from but there aren’t very many junkyards in my area.

[Texoma]

If you have your fuel tables or your bin files I would like to compare them to what is currently in my vehicle. I have ordered the notated apu1 auto prom and g1 adapter with the chips. I have been playing around with different bins in the tunerpro software trying to familiarize myself with the program. I may upgrade to the 4l80e I. The future, depends on how the 60 hold up after I get this thing running. The 4l60e in mine is pretty fresh. It was rebuilt less than 10k miles ago so I am hoping it lasts a little while.

[Texoma]

I have made some changes to the BDJY bin and updated what I believe are the correct spark tables with the vortec information. I will attach the spark tables that I have modified to this post. I will also be deleting the egr on this build just haven't got around to doing that yet. I did notice that the vortec timing sheet only goes to 4800rpm and the bdjy bin goes to 6000rpm, I didn't modify anything abovr the 4800 rpm on that one closed spark table.JPGOpen spark table.JPG