Dialing in timing on a boosted stock bottom end 5.3
06-04-2021, 04:23 PM
#21
Exactly! Cam, compression, quench, fuel, gearing, weight of vehicle, backpressure, so many variables play into what a setup wants. Just throwing out a number on the internet and sticking it in your table can cause problems. Half the time you can pull 5* out of these internet combos and pickup power on the dyno.
06-04-2021, 04:40 PM
#22
Teching In
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I am not looking for a tune, i am just looking for a safe starting point just to put a few miles on the car. Dyno day is a few weeks out and just looking for some safe numbers... Boost is limited to a 6lb spring in the wastegate right now. Based on the specs below how would you go about starting with an initial table. I did go through the idle timing to get the highest vacum reading. I think it is pretty conservative but looking for input from someone with experience. This is pretty new to me so just looking to learn from you guys.
Specs are below:
1993 Fox Body Hatch back.
370ci LS LQ4 24x 93/E85
Summit Stage 2 Turbo Cam (https://www.summitracing.com/parts/sum-8706)
226/230 Dur., 113+4, .600/.575 Lift
9.5:1 compression
Forged Hbeams and Forged Pistons. Ring gap is 30
317 Heads
TBSS intake
Bosch 210 Injectors
Drive By Wire 92mm TB
Terminator X MAX
MAP: 2.5 Bar GM 12592525
CTS: GM LSx CTS
MAT: GM LSx MAT
Oil: GM LSx Oil Pressure
Fuel: Holley 100psi 554-102
Holley 525lph
43 PSI Base Fuel Pressure
Forced Inductions
80/96 Billet ETR T6 Turbo with 1.10 AR
2x VS Racing 50mm WasteGates with 6lb spring
50mm VS Racing BOV
NGK V Power Copper Spark Plug 3346 BR7
CXRacing 4inch core FMIC
4L80E with 3500 PTC Converter
Rebuild with upgraded clutches shift kit and a few other mods.
3.31 gear with 275x15s
Thanks for any help and or feedback.
Mike
Last edited by Mike Partain; 06-04-2021 at 04:54 PM.
06-04-2021, 07:42 PM
#24
06-04-2021, 08:05 PM
#25
the pic is cut off to the right but it looks like 24 degrees in the 4-5k range? That's a crap load to me for 93 and meth. I know you've got lower compression than me but geez. That's why I asked how much meth you're spraying. If you're spraying quite a bit then it might explain it. What size nozzle?
06-04-2021, 08:31 PM
#26
the pic is cut off to the right but it looks like 24 degrees in the 4-5k range? That's a crap load to me for 93 and meth. I know you've got lower compression than me but geez. That's why I asked how much meth you're spraying. If you're spraying quite a bit then it might explain it. What size nozzle?
06-04-2021, 08:43 PM
#27
the pic is cut off to the right but it looks like 24 degrees in the 4-5k range? That's a crap load to me for 93 and meth. I know you've got lower compression than me but geez. That's why I asked how much meth you're spraying. If you're spraying quite a bit then it might explain it. What size nozzle?
06-04-2021, 09:13 PM
#28
28* good lord better be a small bore lazy head combo. Touch an LS3/7 with that and gonna be picking up parts.
I don't start with 28* on anything, thats asking for trouble. Some combos only want 21-22* at most NA and if you try to hold that out to 6-7psi on pump it aint happy.
I don't start with 28* on anything, thats asking for trouble. Some combos only want 21-22* at most NA and if you try to hold that out to 6-7psi on pump it aint happy.
Power shouldn't be peaking with that little timing unless you have serious issues that are keeping you at borderline detonation, or your timing reading is false.
06-04-2021, 09:37 PM
#30
Having ample access to an engine dyno has always said otherwise. If you're maxing out N/A power at 21-22 degrees, its because there are other issues.
Power shouldn't be peaking with that little timing unless you have serious issues that are keeping you at borderline detonation, or your timing reading is false.
Power shouldn't be peaking with that little timing unless you have serious issues that are keeping you at borderline detonation, or your timing reading is false.
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LilJayV10 (06-05-2021)
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06-13-2023, 02:16 PM
#33
how would this gauge compare with a stock 5.7 ls1 with the higher compression?
around 7 psi I am at roughly 13 degrees.....
regards
gavin
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Gav (06-13-2023)
06-14-2023, 08:36 AM
#35
is that a stock ls1 5.7 as well?
06-14-2023, 09:12 AM
#36
No, it's a rod/piston deal LS1 but I told my tuner to treat it like an SBE, the goal was always 16lbs. on pump and that it would make whatever hp it makes.
He tuned my last car too which was a SBE LS1, pump gas only at 14 lbs. with an a2a intercooler, I wouldn't be surprised if timing was in the same region.
That car I ran for four years at 700whp through a T56 and I wasn't kind to it lol, don't know what this car makes but it's way, way faster.
He tuned my last car too which was a SBE LS1, pump gas only at 14 lbs. with an a2a intercooler, I wouldn't be surprised if timing was in the same region.
That car I ran for four years at 700whp through a T56 and I wasn't kind to it lol, don't know what this car makes but it's way, way faster.
06-14-2023, 10:14 AM
#37
Im very close to the same. I think I'm in the 11 degree range at 15 psi or so. A2A with WMI. I've got timing pulled above the .8 range in g/cyl because the tune is scaled 50% so if its hitting almost 1g/cyl that's really approaching 2 g/cyl which means boost has gone awry lol.
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The BallSS (06-14-2023)
06-14-2023, 11:00 AM
#38
FWIW , I'm at 13° at 15.5 lbs , 91 pump , 50/50 WM , AtoA, stock LQ4 compression , small cam . Tried adding 1° at the track on 14.5 lbs made no difference in mph , went back to 13 and added 1 lb. - that worked . WM nozzle is 625 ml / min with is 10gph I believe , no hard data but I'm sure it sprays a lot more that judging by the amount used for a pass / burnout
06-14-2023, 11:09 AM
#39
Maxing out the g/cyl at approximately 10 lbs boost which I'm fine with as it goes from 7 -15 lbs in a split second. This allows me to drop max boost easily with the controller and have more safety with say 14 lbs and 13° for the street and don't have to keep as close an eye on the gauges
06-14-2023, 11:59 AM
#40
Im very close to the same. I think I'm in the 11 degree range at 15 psi or so. A2A with WMI. I've got timing pulled above the .8 range in g/cyl because the tune is scaled 50% so if its hitting almost 1g/cyl that's really approaching 2 g/cyl which means boost has gone awry lol.
Maxing out the g/cyl at approximately 10 lbs boost which I'm fine with as it goes from 7 -15 lbs in a split second. This allows me to drop max boost easily with the controller and have more safety with say 14 lbs and 13° for the street and don't have to keep as close an eye on the gauges
Are you referring to the high/low octane tables?
Wouldn't the engine see more g/cyl boosted as opposed to NA?
Thanks!