rmerchant3

So in my quest to make more power with my setup, I believe I may have overlooked something. I am going with a 6.6" crank pulley and a 3.4" s/c pulley on a novi 1200. That equates to almost the same as a stock sos crank pulley and a 3.0" s/c pulley. That setup seems to put members on here in the 20psi range. Where I think I may have overlooked is my gas tune. I know that the E85 and can handle those pressures at 8000rpm, but will 93 octane be able to? I haven't come across anything where the 1200 was pushed this far on pump gas. I thought about asking my tuner to limit the rpm to 7000 on the 93 tune to protect against any failures. Any thoughts or suggestions?

s2000Junky

Whats possible aside, your at the mercy of your tuners skill set and a big part of that is not only the familiarity with tuning sc s2000 specifically, but reading knock, if there is any doubt on his part to do these two things, id advise you to pulley back up to 4" to hover around 15psi peak. Can you squeeze out more reliably? Questionable, your pushing it, so refer back to first part of my reply. Also keep in mind that your currently over spinning the blower beyond its safe limits. Its rated for 52,000 rpm. That puts you at the stock 5.45" crank with 3.2" at roughly 8350rpm. People have successfully over spun this blower and yielded good power results, but for how long is unknown. Your producing a lot of added heat the bearings weren't designed to handle.

braeden

I spoke to my tuner about this also, he basically said that you can't just limit your petrol tune to 7000rpm or whatever on 93 because the flex fuel map is obviously interpolating between two tunes, and to do this successfully your tuner will need to rev both tunes (E85 & 93) out to the max rpm you wish to run on E85 (8000rpm)

Disclaimer: this is what my tuner said

rmerchant3

I thought long and hard about overspinning the blower and decided to go for it since I rarely get on the car and full throttle runs are brief. I spend most of my time below 6500 even when doing brisk runs through deals gap. overspinning will give me more power in my driving rpm and keep the blower in it's safe range still. My justification was that the blower would only be over revved briefly on that rare chance when I run it out. I'll talk with my tuner and see what he is comfortable with. I know the first time we tuned it he has leery of knock as we played with the timing a lot.

You know, I was thinking the same thing when I pondered the 7000 limit on gas. I knew the two maps worked off each other so it could get tricky. I was thinking they could put estimated tables above 7000 and then fine tune the 7-8 tables after the e85 tune with street and blend tuning. I know my tuner will estimate up to 10,000 rpm for that just in case over rev. It would be more work and take some precise estimation though.....sounds like more dyno tuning $$$ too