Can alky hurt performance?

[87we410877]

Gasoline burns completely at 14.7:1 a/f ratio and Methanol burns at a ratio of 6.45:1 a/f ratio I think?? For comparison sake, if you remove 1lb/hr of fuel, you would replace it with 2lb/hr of Methanol. Basically because methanol makes the power at a far richer a/f ratio, you have to take that into consideration when you spray it, especially in large quantities.You have to nearly double the quantity of meth compared to the amount of fuel you remove, hence the increased a/f ratio. Difficult for me to explain what I mean! sorry

I understand. Just how exactly with a bank to bank would you pull fuel? Would you just lower the air fuel by the vloumetric efficiency table the normal way and then add alcohol untill the actual a/f comes back up? Thanks alot. I have to do alot of reading on the fast help section.

 

[Alky V6]

Setup the preferred target A/F ratios in your A/F table. Setup the A/F numbers the same as if you were running gasoline. This is assuming that your A/F readout is calibrated for gasoline fuel, not lamda. To start out, set it on the rich side. Over time you can lean on it to search for the best HP. Just don't go too lean with the methanol. It will be safer to stay on the rich side and loose a bit of HP if you're shooting a lot of methanol. Leave the VE table alone. Make a run with squeezing the methanol and record how much correction had to be made in the VE table to reach your target A/F ratio. Then make your corrections to your VE table so that VE correction is kept to a minimum. If anything, keep the VE table a little on the rich side so that a few percent has to be pulled to reach your target A/F. This will give you a little safety cushion. If you stop squeezing methanol, go back to your VE and timing tables and adjust it back to the pre-methanol settings that you saved.

Make sure you set enough authority in your VE correction for those times when you run out of methanol by accident. And make sure that amount of authority will be enough.

 

[87we410877]

OK. Thanks alot.