well i finally got it started

**EagleMark** · 03-03-2014

Are the injectors the 5.7L 61 lb/hr ?

At 12 PSI and stock injectors don't do any WOT runs, you don't have enough fuel!

That cap can usually be punched with an Awl and pried out. Then there's a torx bit in there. This is a Minimum Air Screw, not an idle screw. This will not change idle speed, that is controlled by the PCM.

**bonnieclyde100** · 03-03-2014

if i increase the pressure will i be able to do WOT runs and if so will i be able to tune out the richness with the higher pressure? what pressure would you say i should use?

Originally Posted by EagleMark

Are the injectors the 5.7L 61 lb/hr ?

At 12 PSI and stock injectors don't do any WOT runs, you don't have enough fuel!

That cap can usually be punched with an Awl and pried out. Then there's a torx bit in there. This is a Minimum Air Screw, not an idle screw. This will not change idle speed, that is controlled by the PCM.

**EagleMark** · 03-03-2014

Maybe? What size are the injectors? What are all the other specs on motor? Have you ever run it in Desktop Dyno for estimated HP? Fuel injector size with pressure can get you the amount of fuel needed for that given HP.

Also what pump are you running?

**bonnieclyde100** · 03-03-2014

i have 61lb injectors part number5235206. the engine is bored .30 over the cam is 224 duration @ .50 if i remember correctly with 470 lift @ .50. the rest is all stock 1993 chevy 5.7 .the pump is a stock replacement made by precision. here is specs on this link http://www.oreillyauto.com/site/c/de...keyword=e16007 i had it up to 13.5 lbs pressure but it wouldnt run at all so i turned it down but can always turn it back up

Originally Posted by EagleMark

Maybe? What size are the injectors? What are all the other specs on motor? Have you ever run it in Desktop Dyno for estimated HP? Fuel injector size with pressure can get you the amount of fuel needed for that given HP.

Also what pump are you running?

**Roadknee** · 03-03-2014

You have everything you need in your last datalog to adjust your VE tables to do away with the richness. Eaglemark did a great writeup here.

http://www.gearhead-efi.com/Fuel-Inj...-data-Tutorial!

You will need to do this several times, but it will run much better after the first. Crank fuel pressure back up to 13 psi before your next datalog. Also, add 5 degrees to the entire spark table and set 400, 600, and 800 rpm rows 60 kpa and less all to 25 degrees. Open the spark graph and blend the rest of the cells to smoothen, similar to what Mark does to the fuel tables in the link above. The spark table will need more work later, but this will get you started.

I'm reasonably certain 13 psi will support that engine to 4,000 rpm. We can address that later after you get it to run better at part throttle.

**bonnieclyde100** · 03-03-2014

i am having trouble finding the write spark table . the main spark table vs map vs rpm (open throttle is all 0.0) the closed throttle table has 0.0 and negative numbers. so im sure these tables are not the ones to use

Originally Posted by Roadknee

You have everything you need in your last datalog to adjust your VE tables to do away with the richness. Eaglemark did a great writeup here.

http://www.gearhead-efi.com/Fuel-Inj...-data-Tutorial!

You will need to do this several times, but it will run much better after the first. Crank fuel pressure back up to 13 psi before your next datalog. Also, add 5 degrees to the entire spark table and set 400, 600, and 800 rpm rows 60 kpa and less all to 25 degrees. Open the spark graph and blend the rest of the cells to smoothen, similar to what Mark does to the fuel tables in the link above. The spark table will need more work later, but this will get you started.

I'm reasonably certain 13 psi will support that engine to 4,000 rpm. We can address that later after you get it to run better at part throttle.

**bonnieclyde100** · 03-03-2014

i was looking at the original bjyl bin and the spark tables on it was correct i dont know why my changed bin isnt. i guess i will start over

**bonnieclyde100** · 03-03-2014

i had to start over that last bin somehow got messed up all the numbers were messed up. i dont even know how the truck ran at all.

**EagleMark** · 03-03-2014

I hate when that happens!

**Roadknee** · 03-03-2014

When I reviewed your last datalog, the spark advance moved around as would be expected for the stock bjyl bin. I don't think it was corrupted during that datalog. What are you using to read/burn chips?

**bonnieclyde100** · 03-03-2014

Originally Posted by Roadknee

When I reviewed your last datalog, the spark advance moved around as would be expected for the stock bjyl bin. I don't think it was corrupted during that datalog. What are you using to read/burn chips?

i have tunerpro and an autoprom. it may have working correctly but when i looked at the spark table it had all zeros. so i loaded the last bin i saved and it was correct so i just changed it to what i was going for.

**Fast355** · 03-03-2014

Originally Posted by bonnieclyde100

i have 61lb injectors part number5235206. the engine is bored .30 over the cam is 224 duration @ .50 if i remember correctly with 470 lift @ .50. the rest is all stock 1993 chevy 5.7 .the pump is a stock replacement made by precision. here is specs on this link http://www.oreillyauto.com/site/c/de...keyword=e16007 i had it up to 13.5 lbs pressure but it wouldnt run at all so i turned it down but can always turn it back up

A search on Summit Racing revealed 3 different cams with those duration/lift values and they varied from 268 to 296* advertised duration depending on the grind.

The powerband of that cam is probably 2,200-5,500 rpm and sounds like you are trying to run it on a stock torque converter with at best a 1,800 rpm stall converter. Then combine the fact it is in a truck and a poor match for the TBI heads, TBI intake, TBI ECM and results in a much lower DCR and it will be forever a pig off-idle and down low and be choked by the stock TBI components where it really wants to breathe up top.

I ran a 224/224* L82 grind cam in a .040" over 305 with ported 081 TPI heads with 1.94/1.60 valves, doug thorley tri-Y headers, edelbrock 3704 intake bored to 2", 454 TBI. With a 2,800 rpm converter and 3.73s it was ran well in my heavy van, but you could tell the engine really came up on cam at 3,500+ RPM. The L82 cam was 114* LSA and I advanced it to be on a 110* ICL even. Idle vacuum was only 10 in/hg @ 750 rpm with the a/c on and about 14 in/hg without the A/C. It took ALOT of tuning just to make it idle. Code 33 High Map also had to be adjusted to keep it out of limp mode.

That being said I would drop back to something like this. It would make a huge improvement in the low speed driveability and tuneability of your setup.

http://www.summitracing.com/parts/cr...make/chevrolet

**PJG1173** · 03-03-2014

^^ It would be nice to see the actual cam card for the cam that is installed, and I also agree with Fast355 that it is not a good match to the stock TBI intake and heads. with the duration you list in the first post I would think that needs a 2100 stall and somewhere between 9.8~10.5:1 CR.
For my setup, 355 with vortec heads and aftermarket intake, the cam is 230 int./234 exh @ .050 requires a minimum of 2500 stall (http://www.compcams.com/Company/CC/c...?csid=200&sb=0), comp also told me the optimal CR for it was 11:1. it didn't put a smile on my face until I stuffed a 10" 3000 rpm stall into it. it is also taking 80# 454 injectors at 20 psi to feed it.

**bonnieclyde100** · 03-03-2014

Originally Posted by Fast355

A search on Summit Racing revealed 3 different cams with those duration/lift values and they varied from 268 to 296* advertised duration depending on the grind.

The powerband of that cam is probably 2,200-5,500 rpm and sounds like you are trying to run it on a stock torque converter with at best a 1,800 rpm stall converter. Then combine the fact it is in a truck and a poor match for the TBI heads, TBI intake, TBI ECM and results in a much lower DCR and it will be forever a pig off-idle and down low and be choked by the stock TBI components where it really wants to breathe up top.

I ran a 224/224* L82 grind cam in a .040" over 305 with ported 081 TPI heads with 1.94/1.60 valves, doug thorley tri-Y headers, edelbrock 3704 intake bored to 2", 454 TBI. With a 2,800 rpm converter and 3.73s it was ran well in my heavy van, but you could tell the engine really came up on cam at 3,500+ RPM. The L82 cam was 114* LSA and I advanced it to be on a 110* ICL even. Idle vacuum was only 10 in/hg @ 750 rpm with the a/c on and about 14 in/hg without the A/C. It took ALOT of tuning just to make it idle. Code 33 High Map also had to be adjusted to keep it out of limp mode.

That being said I would drop back to something like this. It would make a huge improvement in the low speed driveability and tuneability of your setup.

http://www.summitracing.com/parts/cr...make/chevrolet

manuel 5 speed trans and yea i know the rest but i need to make due with what i have to work with. i might change out that cam a little later i just need it on the road now.

**bonnieclyde100** · 03-03-2014

Originally Posted by PJG1173

^^ It would be nice to see the actual cam card for the cam that is installed, and I also agree with Fast355 that it is not a good match to the stock TBI intake and heads. with the duration you list in the first post I would think that needs a 2100 stall and somewhere between 9.8~10.5:1 CR.
For my setup, 355 with vortec heads and aftermarket intake, the cam is 230 int./234 exh @ .050 requires a minimum of 2500 stall (http://www.compcams.com/Company/CC/c...?csid=200&sb=0), comp also told me the optimal CR for it was 11:1. it didn't put a smile on my face until I stuffed a 10" 3000 rpm stall into it. it is also taking 80# 454 injectors at 20 psi to feed it.

i originally had some old 76 cc heads from the 70s and a holley projection fuel injection on it. and believe it or not it ran pretty good and got me 13-14 miles per gallon going to work and back. mostly highway driving some in town. but it is a work in progress.