5.7 tbi - larger cam tune advice needed

**ony** · 05-12-2018

what type tunning gear you got?

**bdads** · 05-12-2018

moates -all in one - tunerpro - 27sf512 chips,,, everything burns fine and reads fine,,,
I saved the bins from my chips and have been trying to alter them a little at a time,,,
just this thing runs so rich it stalls--- if I could clear that up it would be helpful- thanks

**ony** · 05-13-2018

try a search at the top left tunning with a bigger cam and see if something shows.

**bdads** · 05-14-2018

been searching thru here- and at thirdgen --seems no small steps are gunna help me !!! I'm trying to dial in a 355 with a 305 tbi ,,, it aint going so good !!!
about 10 changes at the track today test and tune--- no good results !!!!! has anyone changed enough with a 305 tbi to make it run good on a 350 ??????? am I wasting my time with this set up ???? should I try to locate a 350 tbi ???? haven't seen any bins for a 350 tbi in a f body yet either !!!!! man this is a rough one !!!!! thanks for any help - steve !!!!

**CDeeZ** · 05-14-2018

Do you have a wideband?

**stew86MCSS396** · 05-14-2018

4.3, 5.0 and 5.7 all share the same throttle bore size. Some may beg to differ but you’re probably good on the air side but if you’re using the 5.0 injectors, you might want to jack up the pressure or go as far as running bbc 80# injectors. I believe ANLU is a 5.7 bin that uses an L98 cam and cop car injectors. Need to work the VE1 and VE2 to get the BLMs dialed in. Your cam is going to idle in the 50 kpa range whereas a stock cam will idle at 30 so your stock tune is gonna feed the engine using the 50 kpa range making it rich. Can you emulate? I would emulate, open a history table most recent and take fuel out of the VE in the cells it idles in. From there datalog and clean up the rest of the VE.

**Fast355** · 05-14-2018

Originally Posted by stew86MCSS396

4.3, 5.0 and 5.7 all share the same throttle bore size. Some may beg to differ but you’re probably good on the air side but if you’re using the 5.0 injectors, you might want to jack up the pressure or go as far as running bbc 80# injectors. I believe ANLU is a 5.7 bin that uses an L98 cam and cop car injectors. Need to work the VE1 and VE2 to get the BLMs dialed in. Your cam is going to idle in the 50 kpa range whereas a stock cam will idle at 30 so your stock tune is gonna feed the engine using the 50 kpa range making it rich. Can you emulate? I would emulate, open a history table most recent and take fuel out of the VE in the cells it idles in. From there datalog and clean up the rest of the VE.

That cam probably idles in the 60-70 KPA range. Probably not much more than 12-14 in/hg of vacuum compared to the stock 305s 20-22 in/hg. Stock 305 HO cam idled about 50 kpa in the 305 in my old 1983 G20. 10:1 355 with a Hotcam I recently tuned idled at about 60-65 kpa in or out of gear with a 3,000 stall in the TH400.