Street89vette

any suggestions with bin adjustments using tunerpro rt? 383 hsr efi 165, $6e, auto, with comp 288hr only runs smooth up to 2500 rpm.
seems to be running rich. If i try to throttle the engine will fall off at 2800 to 3000 rpm. I have been told that this cam is large for efi
but can be tuned. are there any tunerpro tables that i can concentrate on? what parameters need adjusting?

tequilaboy

It would be helpful if you would attach a copy of your current bin file and a corresponding datalog with the issues present. You can zip the files if they are not of the allowed file types for upload.

Fuel injector size?
Fuel pressure?
Fuel (ethanol %)?
Initial advance?
Gear ratio?
t-stat temp?

Street89vette

yes sir, here is the copy of current bin in attachment

Fuel injector size? 42lb
Fuel pressure? 52lbs
Fuel (ethanol %)? 93 pump gas
Initial advance? 8'
Gear ratio? 3.07
t-stat temp? 180

thanks again

tequilaboy

Proceed with caution!

First step would be to correct the single fire and double fire injector constants to approx 46 lb/hr since the 42 lb injectors will flow more at the elevated fuel pressure (52 psi). Your injector constants are currently set to 22.53 and 22.63 lb/hr now which is very close to the stock 22.38 lb/hr setting! Yikes! Then correct the display constant to ~7.67 gallons/hr to match. As-is it should be running extremely rich and has likely fouled the plugs.

Also would make sense to correct the initial advance in the bin to match the actual 8° or simply time it to the standard 6° advance. Just scratching the surface here, really.

From there you will likely need to adjust the injector offset tables a bit to bring the fuel trims in line, but you will need datalogging capability to dial in the fuel trims. No point in working blind, but please correct the injector constants asap.

Street89vette

ok, single fire and double fire injector constants are now 45.93 and 46.03. entered 46 and saved but odd numbers came up.
spark reference angle - base timing is now 8.09.
still looking for "display constant" for 7.67 in parameter menu. could it be listed under different tab?
i can adjust fuel pressure down to 46 or 48lbs if it would help any

just read that constants and scalers are the same? tunerpro rt 5

Street89vette

opps

Street89vette

ok!