What is a safe amount of boost to run on 91 Octane? My next upgrade will put me at 16-17pounds of boost. Is 17 pounds ok or am I playing with fire? My plan is to run a 91 Octane tune and fill with 93 Octane when I can find it.
After reading every post in the BMC post I decided not to mess with the lower. I ordered a FRPP TVS, comes stock with a 2.8 pulley I believe, a 3x larger stock looking resevoir, catch can and a CJ65 TB. I also ordered a 2.5 pulley which should put me at 16 to 17 pounds. I'm second guessing installing the 2.5 pulley now.So, you getting ready to add a 15% lower to your 2.60" upper? You're not playing with fire as long as you run lower advance timing levels and reasonable air/fuel ratios. It's all about heat production. Adding boost and advancing timing increase cylinder temperatures, thus it would probably be adviseable to lower advance timing with your available 91 octane. Now, you put some higher octane gas in the tank and your cylinder cooling is improved and you can be a little more aggressive advance timing.
93 is available in Jersey but I was thinking a 91 tune and using 93 octane would give me a bit of a safety margin. Am I better off with a 93 tune vs a 91 tune? I plan on having it dyno tuned so it will be specific to my setup.Isn't 93 all over NJ?
Imho, 16+ on 91 has risks
Generally, the 91 vs 93 tune explanation is realistically just a matter of how much advance timing your tuner installs in his tune. Certain tuners will also manipulate air/fuel ratio with their street vs. race tunes as well. The last 4 custom tuning sessions that I've gotten for my cars, I worked with my tuner in deciding what timing to run on each of the 3 specific tunes that he devised for me, (the Xcal hand held tuners store 3 custom tunes, plus a slot for storing your original factory tune).93 is available in Jersey but I was thinking a 91 tune and using 93 octane would give me a bit of a safety margin. Am I better off with a 93 tune vs a 91 tune? I plan on having it dyno tuned so it will be specific to my setup.
I am in exactly the same boat. I'm considering the TVS kit for my 09. VMP or the Ford Racing version.....
I like the VMP kit but being in Octane challenged Ca., with 91 Octane Premium, 17+ lbs. of Boost, sounds over the edge to me, as I'm an old Terminator owner. So the Roush .72 Stock look pulley, or the 2.59 VMP stock pulley would be lower Boost, lower heat, and safer, right. Any ideas how much Boost each would have. I also have stock exhaust with KR Axlebacks, and FRPP Cai. Thanx...
Here is some basic information on our website....
http://kennebell.net/KBWebsite/Common/pdfs/jimbells-supercharged-perf-guide.pdf
Wow, that chart gives me a headache! But some really neat deductions.Thank you KB and Van. That chart is very helpful.
Wow, that chart gives me a headache! But some really neat deductions.
Gotta be careful with the Torco mixture ratio results. There are other independent studies that have indicated a much lower octane increase with a 32 oz can of Torco.
No. It's on here somewhere but that was probably 2005 or so. Jon Lund also had testing done and has concurred with the results. Here is a chart I devised back in the day based on Torco mixture rates from these studies. It's fairly universally agreed that the mixtures on the side of the can are not real close to being accurate, and that it is not possible to exceed 101 octane with Torco, regardless of the mixture ratio.Do you have a link to those independent studies about Torco?
No. It's on here somewhere but that was probably 2005 or so. Jon Lund also had testing done and has concurred with the results. Here is a chart I devised back in the day based on Torco mixture rates from these studies. It's fairly universally agreed that the mixtures on the side of the can are not real close to being accurate, and that it is not possible to exceed 101 octane with Torco, regardless of the mixture ratio.
Torco "Accelerator" Octane Mixtures
5gal of 93 with 32 oz of torco = 101
5gal of 93 with 64 oz of torco = 101+?
8gal of 93 with 32 oz of torco = 99
8gal of 93 with 64 oz of torco = 101+?
10gal of 93 with 32 oz of torco = 98
10gal of 93 with 64 oz of torco = 101
15gal of 93 with 32 oz of torco = 96
15gal of 93 with 64 oz of torco = 99