eb02z06

iTrader: (18)

Guys I need some of your input here. I'm getting ready do dyno my 347 F1R combo very soon. Currently I'm running a 4.13 with a 8" crank. I was going to go to the dyno and see what the limits of this motor would be on pump gas 94 and a Alky Control dual nozzle meth setup. So I was just sitting around and thinking-hey I want to go ***** out with the car-so before i hit the dyno to set it up why no just strap on a 3.85 pulley? So basically my thinking is go the dyno and set the car up with pump 94 and straight meth right to the point it just starts to knock-when that point is reached-then dump in some 116 so i have a split of 116 and 94 octane then push it further. So basically i would be making 2 tunes-one for pump gas and one where I mix C16 with pump gas. Then a buddy mentioned that he doesn't think you can mix leaded race fuel with unleaded pump gas? Can it be done-or am I just crazy trying to attempt this? I know there are other things like the Torco Accelerator which is supposed to raise 94 to 107? If it's true who know's? Then back in the day we used to mix Xylene with pump fuel to get an octane boost-somehting that was popular with the Buick crowd. Is any of this feasable?

HUNTER02SS

iTrader: (24)

The leaded fuel will burn out your 02 sensor's I believe.Not sure though.Other's on here mix but I thought it was unleaded race fuel that they mix?

eb02z06

iTrader: (18)

Burning out 02's is no problem-a replacement item. Plus the car will only be running a mix of leaded while at the track. I haven't heard anything favourable about unleaded racing fuel. I know VP even makes some and then there's Pro racing fuel but every racer I've talked to said they have had nothing but bad luck and burnt pistons with them.

HUNTER02SS

iTrader: (24)

The fuel is going to be a learning curve for me also.I thought that when the 02's went out it made everything run like crap.maybe at wideopen throttle its different.I am learning this as well,because i will need to know also.

eb02z06

iTrader: (18)

Your right bro-everyhting will crap out when the 02's go. But i think if you only use the leaded on track days they won't burn out so fast. Let's see what the experts say.

kp

iTrader: (34)

C16 isnt hard on O2s UNLESS you run it super rich. I use 4 gallons of 112 sunoco mixed with 1 galon of 93 unleaded usually at 15psi. Above that I run C16 straight even though I probably dont need it. You can get away with a lot more on a dyno, dont tune until you hear knock though. No reason to beat it up when its fresh and at high power levels detonation can wipe out stuff pretty quick..

eb02z06

iTrader: (18)

Thanks Kp. I won't be tuning until i can hear "knock" but i will keep tuning until i can see it when logging with HPT. What I typically do is keep adding timing while maintaining a AFR of around 10.8-11.1 throughout the pull. When i see the knock sensors pick up 1 degree, I pull out 2 to be safe. I will be leaving the knock tables just like stock-I did it this way last year and my stock short is still alive and show'd no sign's of abnormal wear on the bearings from knock.

kp

iTrader: (34)

I havent used knock sensors in years, you will see the power start dropping off quick if it gets into detonation. Just start slow and when adding a little timing does nothing just back it off and be happy, and make sure you dont run out of pump or injector because you can chase your tail for a while and do some damage in the process.

Good luck with it, curious to se what kind of boost numbers you see with the F1R.

eb02z06

iTrader: (18)

Thanks Kp-it's all gonna unfold very soon bro.

mahhddgtp

Why not?

kp

iTrader: (34)

Forged pistons and noisy valve train set them off, along with letting go of a trans brake/2-step and it would pull timing all over the place - not the best thing for bracket racing.

BS3 doesnt use them anyways, but I ddint use them with the stock PCM either. I always use good fuel and a conservative tune so I never worry about it.

mahhddgtp

Now I'm beginning to see why a 700+ rwhp 'street/pump gas car' is so hard to build up.

kp

iTrader: (34)

Its not hard to build a 700hp pump gas car, just hard to keep it running long at that level. Main problem is fuel quality is all over the place, if I was running pump gas and street driving I would leave the knock sensors and live with some extra timing getting pulled here and there or do what most d and just back it way off for street driving on pump gas..