How much boost can I run with 87 octane on an LS
Mar 20, 2020 | 02:47 PM
#21
Well I guess if you want me to explain it while disregarding the facts that:
- The F150 has same coefficient in drag compared to a 23 year old Buick (albeit higher effective area), so not as much as a brick as one would think
Turbos arent magic, they do increase VE! http://www.ijmer.com/papers/Vol3_Issue2/AM32674677.pdf
If I am not mistaken, there was a 6% VE increase as found in this paper, but disclaimer: a lot of what they said I didnt really comprehend
Last edited by arthursc2; Mar 20, 2020 at 04:44 PM.
Mar 20, 2020 | 04:42 PM
#22
Correct, that is where you would see improvement for two reasons. Under part throttle acceleration, the engine can use the energy from the exhaust (via the turbo) therefore requiring not having to work quite as hard (this changes though when you go heavy throttle and transition into high fuel enrichment to protect the catalyst and cylinders from excessive heat) - basically light boost. And secondly from the fact that you can get away with less displacement and few cylinders (less friction).
Although comparing a 6 speed all steel body to a 10 speed aluminum body might not be fair comparison as to how much the engine size and turbo effect performance. :-)
Although comparing a 6 speed all steel body to a 10 speed aluminum body might not be fair comparison as to how much the engine size and turbo effect performance. :-)
mind you, my Denali is my baby and it’s a GM. I just get frustrated with any of the new GM’s.
Mar 20, 2020 | 05:36 PM
#23
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Wow, thats a lot of responses real fast. To clarify, this is still just an early plan, I wanted to know the margins I was playing with, if anyone has done this with a 1st gen LS. In theory, you should be able to put up *some* boost before knocking, otherwise as soon as your fuel degrades at all youd have the problem NA. The resounding answer seems to be its a dumb idea to try, and maybe one day if I have a junk LS Ill try it for my own curiosity but it looks like the new plan is to do the less fun thing and buy something with better economy.
Mar 21, 2020 | 06:46 AM
#26
Wow, thats a lot of responses real fast. To clarify, this is still just an early plan, I wanted to know the margins I was playing with, if anyone has done this with a 1st gen LS. In theory, you should be able to put up *some* boost before knocking, otherwise as soon as your fuel degrades at all youd have the problem NA. The resounding answer seems to be its a dumb idea to try, and maybe one day if I have a junk LS Ill try it for my own curiosity but it looks like the new plan is to do the less fun thing and buy something with better economy.
Mar 21, 2020 | 08:20 AM
#27
I wish GM sold a kit four cylinder Duramax
Mar 21, 2020 | 03:21 PM
#28
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Joined: Dec 2004
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From: fort campbell
first off, look up a dynamic compression ratio calculator and input your specifications in there.
then alter the static compression ratio
if it is pinging, retard the spark run different plugs increase intake cooling
then alter the static compression ratio
if it is pinging, retard the spark run different plugs increase intake cooling
Mar 21, 2020 | 06:10 PM
#29
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If it's economy that you are after and have spare cash right now, put in a Cummins 2.8 kit engine. You will get excellent fuel mileage, you will have a turbo for bragging rights, and when you are ready all you will need is a tune to get the power boost that you dream of.
I wish GM sold a kit four cylinder Duramax
I wish GM sold a kit four cylinder Duramax
