15 PSI+ Boost guys and Stock Blocks
07-07-2010, 10:59 PM
#22
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I was surprised when I tried 22 degrees and only gained 2 rwhp. I'm sure a lot comes into play when the boost level starts getting that high so safer is always better. I can tell you that meth is definitely safer. It only took one 15psi pull to kill the motor without meth after 2 years of abuse with it.
I'm interested to get my truck back on the dyno with my new setup to see if the cam I have now will help any. I went from the ls6 cam to the Lingenfelter gt7 which is very similar but is supposed to be for turbos.
07-08-2010, 01:32 AM
#23
When I was running 14-15 psi (procharger) I ran my best time with 24*. It picked up .2 and 2mph in the 1/4 going from 20* to 24*, however it pushed a little water at 24*. This was with half/half race and pump gas, single M15 meth cranked all the way up.
After it pushed water I didn't run the truck again that night. Let it cool down completely and it hasn't pushed water since, even at 23 psi. I was using Cometic gaskets and ARP bolts on stock heads.
After it pushed water I didn't run the truck again that night. Let it cool down completely and it hasn't pushed water since, even at 23 psi. I was using Cometic gaskets and ARP bolts on stock heads.
07-08-2010, 08:12 AM
#24
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I think each setup is different. With my setup 2 degrees of timing will normally increase by 10-15 rwhp. Boost seems to depend on what level I'm at and where I am in the compressor map. At low boost levels say around 6-8psi I only gain about 15-18 rwhp per psi. Higher boost levels are a little different, I typically gain 22-28 rwhp per psi over 10psi. By looking at the compressor map for my turbo it gets more effecient as the boost level goes up. I only have a 2 bar map sensor so I try to find a happy medium with both boost and timing to get to my goal number at 15psi or less.
I was surprised when I tried 22 degrees and only gained 2 rwhp. I'm sure a lot comes into play when the boost level starts getting that high so safer is always better. I can tell you that meth is definitely safer. It only took one 15psi pull to kill the motor without meth after 2 years of abuse with it.
I'm interested to get my truck back on the dyno with my new setup to see if the cam I have now will help any. I went from the ls6 cam to the Lingenfelter gt7 which is very similar but is supposed to be for turbos.
I was surprised when I tried 22 degrees and only gained 2 rwhp. I'm sure a lot comes into play when the boost level starts getting that high so safer is always better. I can tell you that meth is definitely safer. It only took one 15psi pull to kill the motor without meth after 2 years of abuse with it.
I'm interested to get my truck back on the dyno with my new setup to see if the cam I have now will help any. I went from the ls6 cam to the Lingenfelter gt7 which is very similar but is supposed to be for turbos.
When I was running 14-15 psi (procharger) I ran my best time with 24*. It picked up .2 and 2mph in the 1/4 going from 20* to 24*, however it pushed a little water at 24*. This was with half/half race and pump gas, single M15 meth cranked all the way up.
After it pushed water I didn't run the truck again that night. Let it cool down completely and it hasn't pushed water since, even at 23 psi. I was using Cometic gaskets and ARP bolts on stock heads.
After it pushed water I didn't run the truck again that night. Let it cool down completely and it hasn't pushed water since, even at 23 psi. I was using Cometic gaskets and ARP bolts on stock heads.
07-08-2010, 10:03 AM
#25
Based on my experience with procharger stuff your right in the sweet spot with pump fuel. My killer street tuneup (pump fuel) was 14 psi, 20*, 100% meth with afr rich at 10.8-11.0. Truck ran consistant mid-low 11's for almost 2 years with this tune up and zero maintainence. By zero maintainence I mean that I never even pulled a spark plug or changed the blower belt for 2 years. It has only been in the last year that I started changing things up boost and tuning wise, at which time it picked up another second and 7 mph.
07-08-2010, 12:23 PM
#26
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Based on my experience with procharger stuff your right in the sweet spot with pump fuel. My killer street tuneup (pump fuel) was 14 psi, 20*, 100% meth with afr rich at 10.8-11.0. Truck ran consistant mid-low 11's for almost 2 years with this tune up and zero maintainence. By zero maintainence I mean that I never even pulled a spark plug or changed the blower belt for 2 years. It has only been in the last year that I started changing things up boost and tuning wise, at which time it picked up another second and 7 mph.
07-08-2010, 03:24 PM
#27
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i ran a stock block with head studs stock 317 heads and 24psi...not sure on the timing tho..some were about 13 or so i think...but dont hold me to it..bosted spike to 30psi and welllllllllllll.....you saw the vid im sure of the fire ball....lifted the head and cut a nice new hold in the deck...
07-10-2010, 06:15 PM
#29
I have been 20+ on my stock block with a couple 26psi spikes as well, no issues with mine.
IMO, its not so much the boost, but the turbo kit setup that will either save your motor or not. All these log manifold, single side kits are a huge killer in keeping high boost pressures and the heads together. Its all about getting air in, and getting air out, EQUALLY. I was running an easy 17 degrees on 18psi with 91 and meth on my 5.3.
R
IMO, its not so much the boost, but the turbo kit setup that will either save your motor or not. All these log manifold, single side kits are a huge killer in keeping high boost pressures and the heads together. Its all about getting air in, and getting air out, EQUALLY. I was running an easy 17 degrees on 18psi with 91 and meth on my 5.3.
R
07-10-2010, 07:27 PM
#30
I have been 20+ on my stock block with a couple 26psi spikes as well, no issues with mine.
IMO, its not so much the boost, but the turbo kit setup that will either save your motor or not. All these log manifold, single side kits are a huge killer in keeping high boost pressures and the heads together. Its all about getting air in, and getting air out, EQUALLY. I was running an easy 17 degrees on 18psi with 91 and meth on my 5.3.
R
IMO, its not so much the boost, but the turbo kit setup that will either save your motor or not. All these log manifold, single side kits are a huge killer in keeping high boost pressures and the heads together. Its all about getting air in, and getting air out, EQUALLY. I was running an easy 17 degrees on 18psi with 91 and meth on my 5.3.
R
