I have had this motor for almost a year as a daily driver now. I have for the most part drivability idle to 3200rpm with out knock and seems to run pretty good. Where my main issues are is it may break the tires loose a little off the line so it seems I may not have enough something there and also after about 3/4 throttle it drops off. My idle seems a little high usually in park around 1100-1300 and in drive with brake anywhere from 800-1000. The vehicle is a 88 chevy 1500 reg cab reg bed weighs 3960lbs without me in it. here is the motor build:
motor: ATK SP03 357 4-bolt .040 +12.3cc Dish pistons 9.7:1 w/64cc
cam: Comp Cams 12-262-4 1,500-5,500rpm 218/224 @.050 .464in/.470exh. lift LSA114
lifters: COMP Cams High Energy Hydraulic Lifters 812-16
pushrods: comp cams High Energy Pushrod Set Chevy 262-400ci w/Flat Tappet Cam 5/16 7.794
timing chain: Magnum Double Roller Timing Set 1955-91 Chevy Small Block V8 265-400
springs: COMP Cams Valve Springs 26918-16 Beehive 372 lbs./in
rocker arms: Competition Cams 1417-16 Magnum Self-Aligning Roller 1.52 ratio, 3/8"
harmonic balancer: ACDelco Harmonic Balancers 12551537 6.75in cast iron, internal balance
Flexplate: Gold Series SFI-Rated Chromoly Steel Flexplate 1986-97 Small Block Chevy 350 Gen II
oil pump: Melling M55HV High Volume
Gaskets all Felpro
Bolts all ARP except mains and piston rods
Vortec heads 062
Edelbrouck EPS Performer for vortec heads
TBI adaptor aluminum
TBI bored to 50mm with tbi spacer and #80 cop car injectors adj fpr w/17-20psi (17psi at 90's F and 20psi under 65 F)
stainless midtube headers 1 5/8 to 3in
msd blaster coil
electric fans
upgraded to 3 wire o2 sensor
I have a 700r4 trans rebuild about 3yrs ago with the extra clutch packs and upgraded valve for firmer shifts(im not a transmission person had a buddy build it who has a transmission shop)
FTI 2,400 stall convertor
3.42 gm posi rear
255/60r15 tires
I have been reading post for years learning and tweaking the setup but I am getting stuck at this point. I know I will only get 5000 rpm out of the tbi which is fine.
I do not have a wideband o2 for testing from what I have been reading seems I might need t get one.
I started with Dave w. Performance AMUR bin file and have gone from there. I just changed the timing a little and have a little better low end and during normal driving but still 3/4 throttle up drops on it's face. Here is the bin files and logs. Oh yeah it is a 7747 $42. The datalog .csv would not upload so I zipped it.
Any help would be greatly appreciated. I hope I got all the info and files you need to take a look.
Also just to make sure this is working corretly I have a raspberry pi running android connected to a 5in touch screen running aldldroid which is where I datalog from and is also a touchscreen gauge cluster when driving.
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