second opinion before i turn the key

Ok, a little background first. Got the truck from a junkyard, 1992 K2500 HD. 5.7, 4l80e, 4.10's, $85 ecm. Engine wasn't original, ended up spinning a bearing a year later. Got another 5.7 from a different junk yard. Decided to tear it apart and rebuild it. turns out it had been rebuilt before. So I now have a 357sbc, with ported stock heads, 2.02/1.60 valves, flat top pistons, new crank, new rods, new roller rockers and springs, summit sum-1102 cam, long tube headers, edelbrock torkerII intake, 454 TBI with an adapter plate to bolt onto the carb intake, and 65# injectors (i also have the 454 injectors). I ran the intake/carb/injector set up on the first motor and it ran wonderful. But with the new engine upgrades, especially the cam, the chip NEEDED redone. I've done some initial changes thanks to the forum, and was just wondering if anyone has any suggestions, and if they could peruse over what my file before i plug the chip in and start the truck for the first time. I got a new fuel pump too that puts out 15psi, and a few spare TBI's so i can make up an AFPR for fine tuning once we get the truck rolling. thanks for any and all feed back guys!!

Would you be willing to post your files for us to look at? .bin / .adx / .xdl

dave w

Oh shit haha I forgot to upload it all. I'll get it uploaded when I get back home.

Here ya go

Can I ask why the 65 lb/hr injectors are being used over stock ones that flow more?

Stock should be 74 lb/hr or 80 lb/hr...

I'm wondering about the math used to figure out the BPW of 103?

A stock $85 5.7 liter has a BPW of 135. I'm not sure a BPW of 103 is correct (seems to low) for a 5.7 liter using 65 lb injectors / 15 PSI fuel pressure.

The attached .bin file is a baseline performance chip I did for a stock $85 5.7 liter. The added 4 degrees to the entire spark table for the stock engine might be something that would help your engine?

dave w

I put together a BPW calculator for Microsoft Excel.

dave w

Sorry for takin so long to reply. We were buttoning up the truck. When I did the math for bpw, I did it with the 454 injectors in mind. Only reason the police injectors are in is because that's what I ran with the stock motor. I haven't had a chance to look at the file you uploaded, hope to tonight. We started the truck yesterday and it at least ran haha. So I guess now it's time to get serious with the new burn.

Quote:

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Originally Posted by EagleMark

Can I ask why the 65 lb/hr injectors are being used over stock ones that flow more?

Stock should be 74 lb/hr or 80 lb/hr...

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The STOCK injectors were 55 lb/hr lol. I have the 454 injectors in the garage, planned on putting them in once the motor was all hooked up. The 65 lb/hr are in it because the intake/tbi setup is same I used on the stock 5.7. But after all the mods (cam, valves, bore) I figured I'll have to use the 454 injectors.

dave according to your worksheet if i use the 454 injectors, my bpw should be around 106. i had used a spreadsheet mark had posted in another forum to come up with the 103. i guess i should have clarified all of that in more detail. I planned on using the 454 injectors, but I wanted a second opinion that it was the wiser choice.

Pretty sure that is Dave's BPW calculator included in the spreadsheet you got from me. It's the only one I run.

Quote:

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Originally Posted by Hillbilly

dave according to your worksheet if i use the 454 injectors, my bpw should be around 106. i had used a spreadsheet mark had posted in another forum to come up with the 103. i guess i should have clarified all of that in more detail. I planned on using the 454 injectors, but I wanted a second opinion that it was the wiser choice.

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The worksheet calculator is a good estimate for initial BPW. It's common for the actual injector flow / rated injector flow / programmed injector flow (.bin) to all be different values. I think the difference BPW 103 vs. 106 is 5.7 liters vs. 5.85 liters.

dave w

How do you figure out the duty cycle percentage for the calculator? Obviously it's gonna be different through the powerband, should I just say 100%? Got chip burned and been workin on the VE table. Runs great so far, but it seems like it's lacking at wot and 2800+. Thought maybe my bpw is to low

Quote:

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Originally Posted by Hillbilly

How do you figure out the duty cycle percentage for the calculator? Obviously it's gonna be different through the powerband, should I just say 100%? Got chip burned and been workin on the VE table. Runs great so far, but it seems like it's lacking at wot and 2800+. Thought maybe my bpw is to low

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Duty cycle is not in the BPW calculator. Injector flow (requirements) must be known before using the BPW calculator.

Increasing the BPW value will provide more fuel for the entire VE Table. It's possible you will need to increase the BPW to provide more fuel for WOT 2800+ RPM's. It's very likely you will need to adjust the VE after changing the BPW.

dave w

Quote:

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Originally Posted by Hillbilly

The STOCK injectors were 55 lb/hr lol. I have the 454 injectors in the garage, planned on putting them in once the motor was all hooked up. The 65 lb/hr are in it because the intake/tbi setup is same I used on the stock 5.7. But after all the mods (cam, valves, bore) I figured I'll have to use the 454 injectors.

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I was thinking about using the bigger 5.7 65 lb/hr too for my build, my cam is just a little hotter then the K1102 your using and I didn't know if that was more lb/hr then I needed, I will be following this thread.

Well, been a long while since I've been here. Had life get in the way haha. Two fuel pumps, a new gas tank, some sensors, distributor, and a baby, I got around to updating. I put the 80lbs injectors in my truck, tuned it a little, and thought I would see what everyone thinks. I drove around with 9 full size rail road ties in the bed (about 2250lbs being conservative). It runs GREAT but I'm far from done tuning it. Over the summer I'll be putting on some vortec heads, too. Just to recap what I'm running: 92 k2500, 7060 ecm, 357sb, flat top pistons, ported tbi heads with 2.02/1.60 valves, estimating 9.5:1 compression, summit sum1102 cam, 1.5 roller rockers, hedman competition headers, torker2 intake, 454tb with 80lbs injectors, injector pod spacer, AFPR cranked all the way up, msd 6al2. I had a salad bowl on but took it off because i didnt like how close it sat to the hood, need to get a cowl at some point haha. so i still have the choke tube and stock air cleaner assembly, except i have a k&n extreme flow filter lid and a 14 in filter sitting in the air cleaner. plugs are gaped out to .060 according to msd's recomendation, and running autolite plugs one step colder than stock. trans is a 4l80e, 4.10 gears and govloc in the rear. straight pipe exhaust, no mufflers or cats. no egr. thinking about getting a shift kit to put in it over the summer, too. I use the truck to haul a mud truck, and run in modified stock class in mud bogs just for fun. any suggestions for improvement, either mechanical or programming? i will say, the blm numbers seem pretty low (in the 105-124 range going up with map) in the lower rpms, but after about 2400 rpm they smooth out to 128 in every rpm and map.

RPM/MAP 20 25 30 35 40 45 50 60 70 80 90 100 0 400 107 107 116 124.3 124.3 128 128 800 105 107.7 107 115.7 124.3 119.6 128 128 1200 108.3 105.3 105 105 105 105 117 124 125 125 1600 112.2 107 107.9 105.1 106 105 108.9 121.1 117.7 124.5 125 2000 116 113.8 114 110 108.9 113.4 110.3 119.1 120.8 125.3 123 2400 128 128 128 128 128 105 125.9 125 125 126 126 2800 128 128 128 128 128 128 3200 128 128 128 3600 128 128 4000 128 128 4400 128 128 4800
that was my last run to get my bin where it is now.

BLM averages below 128 are rich. BLM averages above 128 are lean. The attached screen shot can be helpful understanding engine load vs. RPM vs. MAP. I would adjust VE table to get the BLM's closer to 128.

dave w

Could you describe the port work done on the heads? How much bowl work was done? How much of the swirl ramp was removed? Was the chamber unshrouded to accommodate the larger valves?

Dave thats what i figured, just keep datalogging. Just wanted to make sure i wasnt missing something, still a fresh fish lol. Roadknee its nothin special. Its how the heads came so i dont know specifics because it was a junk yard engine. Looked like they were gasket matched and had the swirls worked out smoothe as far as i could see. They were definitely punched out for the valves too. Which all sucks cuz i wanted the sworls and 1.90 valves lol. Keep velocity and torque up.

My build is very similar to yours but I'm not as far along as you yet (still accumulating parts). 95 k2500, 4l80e, 4:10 gears, building a 355. Already have vortec heads and a roller cam with slightly less duration than yours. Have a 46 mm bored tb from tbiparts.com and have been considering 65lb injectors. If your gonna stick with the 80lb in yours and you would be interested in selling your 65lb, pm me, I may be interested. I will be following your build with interest!

Sorry truck guy, we picked up a 91 suburban so I'm gonna throw those injectors into it lol. Been messin with the truck some more, I bumped up the bpw from 106 to 109. I was cuting out at 4000-4500 still and those 3 points took care of it. I started comparing with the g-p trucks and 454ss settings. Pulled a lot from those, including transmission data and idle data. It runs amazing now. Still gotta do a lot more data tracing tho. WOT is perfect, its the town driving that needs work, still rich in the lower MAP. Using the g-p and ss bin files helped a lot with getting that 3/4hd workhorse to move haha. ill post the bins i used for all of my comparisons and what i've got currently, plus the log to show what I've changed.

$85-My bin I run
AWBM- The stock bin for my truck
BAJW-The commercial van/chassis truck bin
BAMY-454SS Silverado bin
BAAX- The bin Dave gave me to compare

Let me know if anyone has any suggestions or sees any problems!!Thanks folks.

RPM/MAP	20	25	30	35	40	45	50	60	70	80	90	100
0					105	105	105	105	105	105	105	105
400			128	120	105	110	111	119	128	115	115	110
800	126	128	124	109.038	105	116.45	118.45	126.407	129.333	128	126	120
1200	126	130	121.583	105	105.06	105	105.05	123.236	127.2	128	126	126
1600	126	135.2	122.611	123.531	124.778	111.9	105	107.82	132.471	126	126	126
2000	128	131.938	126	126	126	120	109.125	120.01	125	140	126	126
2400	128	128	128	128	128	128	115	125	129.615	140	128	128
2800		128	128				120	128	128	130	128	128
3200							128			128	130	128
3600										128	130	128
4000										130	130	128
4400											128	128
4800											128	128

Figured I'd post up my last data too to show how I got to my current VE. Am i putting in the extra data correctly (highlighted in red)? Never was to sure on that whole deal haha. Thanks.