did you set timing with bypass connected or disconnected ?
did you set timing with bypass connected or disconnected ?
I didn’t view your log but Make sure your bpw is appropriate for the engine size and injectors used. I’m no expert but as i understand it you need to get the bpw in the ballpark first then start messing with ve and spark.
The term RV cam means different things to different folks these days, and for all intent and purposes can be a very large range.
I still crack up every time some one says they have a "3/4 race cam", what is that? LOL
The massive range of camshaft designs in lift and duration, rocket ratios, cam timing offset, etc. make the term "RV cam" obsolete for all intent and purpose when it comes to tuning efi engines.
Just a odd thought that came to mind re-reading this post.
Have a great week. It will be wet, then wet in cold in our neighborhood this week.
Jack of all trades, absolutely master of none! Too many projects, not enough time and limited funds.
Geronimo, Guadalupe County, Texas
1993 K1500 Suburban - SBC Refit retraining the TBI and Computer Control.
2004 Z66 Avalanche 5;3 to 6.0 LQ9 upgrade - project pending
What are the Air Fuel Ratios from the data log?
dave w
Near Idle.jpg
Off Idle.jpg
I bought a kit from RV Morse Machine, unfortunately he passed away in August, but you s/b able to find one elsewhere. You have to bend down the MAP vacuum tube a little to make it work. The installed pic was when I had a 28LB spring running at 28 PSI
Edit: I think I had ~$130 all in on this setup.
Last edited by PlayingWithTBI; 12-05-2021 at 08:33 PM.
Looks great.. I really like your setup. I purchase a Fuel pressure Adapter I plan on install when I take off the TBI. I thought I would just leave in place. I like adding the gauge like you did however, might go that route as well.
Wide Band (AFR) tuning is Optional. Knowing the AFR's for Choke, Warm Up, Acceleration Enrichment, and Power Enrichment is very useful data.
I consider Wide Band tuning more accurate than BLM' tuning.
I posted Wide Band tuning information here: Wide Band O2 (WBO2 Tuning) Spreadsheet (gearhead-efi.com)
dave w
My bad. Yes, I disconnected the brown set timing wire (lot easier in the Van then in my 89 pickup) and I did change the tune to match 5 Degrees advanced as well. We are going to get Snow tonight, so not sure I will get the Gvan on the road anytime soon to data log again. I did purchase a new fuel pump like suggested by PlayingWithTBI, and plan to adjust the fuel pressure by following these direction, found link on this site!!. https://www.thirdgen.org/tbi-afpr/ My plan is set it at 14/15 PSI, which should be good for the stock TBI heads the cam, or so I have read..
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