LS1 Initial Start Tune
Thread Starter
Teching In
Joined: Mar 2024
Posts: 10
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LS1 Initial Start Tune Hello and Cheers everyone. This will be my first HP tuners post. Its been a long build and I've been so excited to get to this point in the journey. I've tried to do some basic research on Tuning with the MAF, bumping up injectors, ect. I have done so many changes it worries me on how hard its gonna be to get it in the ball park of starting and running. Was hoping maybe someone with a lot more time with this stuff could lend a hand. This is ALL new to me and I have learned more the last two weeks than I feel like I have in years. I am so excited to start this HP tuning journey.
Car is a 2002 Camaro 5.7 T56 car. was all original before I started the build.
12.5/1, stock stroke, .007 over on the LS1 engine
2.5 PRC job on the 241 heads with stainless valves, springs, retainers, and trunion upgrade
Fast 92mm lsxr intake, with a 92mm summit throttle body
43.5 pound injectors https://www.injectorplanet.com/produ...-a1120780349-1
racetronix pump with harness upgrade
4" intake out the center of the front bumper (uses stock 3.5" MAF before the throttle body
TSP Magic Stick 3 Cam Specs: 238/242, .600'/.600', 112 LSA, 110 ICL
Long tubes with X pipe some small mufflers and dump before the axle.
I am sure there is probably a bit of info that might still be needed but like I said I am as new as it gets to all of this. Literally all I have done in HP tuners so far is turn off VATS
I tried to go to the HOIST link to look at some other tunes but I cant seem to get it to pull up at all. Thanks in advance
Car is a 2002 Camaro 5.7 T56 car. was all original before I started the build.
12.5/1, stock stroke, .007 over on the LS1 engine
2.5 PRC job on the 241 heads with stainless valves, springs, retainers, and trunion upgrade
Fast 92mm lsxr intake, with a 92mm summit throttle body
43.5 pound injectors https://www.injectorplanet.com/produ...-a1120780349-1
racetronix pump with harness upgrade
4" intake out the center of the front bumper (uses stock 3.5" MAF before the throttle body
TSP Magic Stick 3 Cam Specs: 238/242, .600'/.600', 112 LSA, 110 ICL
Long tubes with X pipe some small mufflers and dump before the axle.
I am sure there is probably a bit of info that might still be needed but like I said I am as new as it gets to all of this. Literally all I have done in HP tuners so far is turn off VATS
I tried to go to the HOIST link to look at some other tunes but I cant seem to get it to pull up at all. Thanks in advance
10 Second Club
Joined: Nov 2005
Posts: 933
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Are you using the Mercedes type injectors? The first thing for you to do is get the correct data for your new injectors at 58 psi. I will guess that is where your fuel pressure is set. Under FUEL, You need ---Injector Flow Rate vs KPA VAC, Minimum injector pulse, Offest vs Volts vs VAC, Short Pulse Limit, Short Pulse Adder. Injector supplier should have that info. Why did you delete VATS if you still have the stock computer and wiring? Here is a cammed 2002 tune with 60# injectors---do not copy this injector data. I don't know where this tune is from, so just use it as a compare file. Blind copying a tune usually ends badly. After getting the injector data correctly entered, copy the MAF values and the VE values to your tune and see if it will crank. Be sure and have your Short term fuel trims on (O2 Sensors) and have your scanner set up to read them so you can see quickly if they are close. You will have to adjust for that bigger throttle body. Don't blow it up.
Thread Starter
Teching In
Joined: Mar 2024
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Thanks for the reply! I have requested a data sheet this morning. Idk if they will be able to provide one or not so I may have to find another set of injectors. I have no need for the vats, and I also went to the motion race works steering shaft assembly it’s not longer got the factory ignition. I will compare and contrast some things in that tune you sent me. Thanks for taking the time
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Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
I just used an Injector Calculator: https://www.witchhunter.com/injectorcalc1.php
310grams/minute is 29.5 Lb/hour.
Since that is the 3Bar rating and LS engines typically run at 4Bar, that pressure increases gives you 34.1 Lb/Hour.
It is good to have all the other specs too as there is a delay depending upon voltage.
310grams/minute is 29.5 Lb/hour.
Since that is the 3Bar rating and LS engines typically run at 4Bar, that pressure increases gives you 34.1 Lb/Hour.
It is good to have all the other specs too as there is a delay depending upon voltage.
Thread Starter
Teching In
Joined: Mar 2024
Posts: 10
Likes: 0
I just used an Injector Calculator: https://www.witchhunter.com/injectorcalc1.php
310grams/minute is 29.5 Lb/hour.
Since that is the 3Bar rating and LS engines typically run at 4Bar, that pressure increases gives you 34.1 Lb/Hour.
It is good to have all the other specs too as there is a delay depending upon voltage.
310grams/minute is 29.5 Lb/hour.
Since that is the 3Bar rating and LS engines typically run at 4Bar, that pressure increases gives you 34.1 Lb/Hour.
It is good to have all the other specs too as there is a delay depending upon voltage.
bumped up to 4 bar is 52 psi. I changed my injectors accordingly. Started on the second crank and idles on its own great. Now I can start dailing fine tuning the rest. Thanks everyone
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Joined: Aug 2010
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From: Ann Arbor, MI
https://deatschwerks.com/pages/other-conversions
310 g/minute is 30 lb/hour (Yes, 310 divided by 454 times 60 is 40, but that is not how any injector supplier calculates it; there must be more to it.)
And the increase from 43.5 psi to 58 psi, is not to multiple by the difference (1.33 or your 1.27) but rather by its square root of 1.15.
Sure you can tune around the wrong injector data, but after a while it bites you.
Just trying to be helpful, not argumentative. Been doing EFI stuff for 20+ years.
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Verdad Gallardo Thread Starter
Teching In
Joined: Mar 2024
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I know how you calculated that, but they don't agree with any injector site. Since you didn't like/trust the injector calculator site I mentioned before, here is the one from one of the most reputable injector suppliers:
https://deatschwerks.com/pages/other-conversions
310 g/minute is 30 lb/hour (Yes, 310 divided by 454 times 60 is 40, but that is not how any injector supplier calculates it; there must be more to it.)
And the increase from 43.5 psi to 58 psi, is not to multiple by the difference (1.33 or your 1.27) but rather by its square root of 1.15.
Sure you can tune around the wrong injector data, but after a while it bites you.
Just trying to be helpful, not argumentative. Been doing EFI stuff for 20+ years.
https://deatschwerks.com/pages/other-conversions
310 g/minute is 30 lb/hour (Yes, 310 divided by 454 times 60 is 40, but that is not how any injector supplier calculates it; there must be more to it.)
And the increase from 43.5 psi to 58 psi, is not to multiple by the difference (1.33 or your 1.27) but rather by its square root of 1.15.
Sure you can tune around the wrong injector data, but after a while it bites you.
Just trying to be helpful, not argumentative. Been doing EFI stuff for 20+ years.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Well that explains it and shows my embarrassing mistake.
Your injector specs are in Grams/Minute instead of the more usual (in the US anyway) CC/minute. With water it would make no difference as 1 CC of water weighs almost exactly 1 Gram, But gasoline (N-Heptane) weighs less and therefore 1 Gram is 1.45-1.49 CC.
Therefore 310 G/Minute is indeed 41 Lbs/Hour.
But the flow at 58 psi is less than you calculated. It is 41 times Square-root(58 divided by 43.5) = 47.3 Lbs/Hour.
Your injector specs are in Grams/Minute instead of the more usual (in the US anyway) CC/minute. With water it would make no difference as 1 CC of water weighs almost exactly 1 Gram, But gasoline (N-Heptane) weighs less and therefore 1 Gram is 1.45-1.49 CC.
Therefore 310 G/Minute is indeed 41 Lbs/Hour.
But the flow at 58 psi is less than you calculated. It is 41 times Square-root(58 divided by 43.5) = 47.3 Lbs/Hour.