1slickRED89
Guest
I guess I'm in the middle on the FMU issue, FMUs are ok for low boost cars with complicated electronics that are hard to get tuning chips for. but you need at least a high flow/ high pressure fuel pump (or stock pump + booster pump) or it will not due what is supposed to do. for example you have a 5 PSI Sc system, with a 10:1 FMU you need 89 PSI of fuel pressure to get the correct fuel curve (at full fuel flow too.) if you think the stock pump is going to do 90+ PSI and full flow, you simply are not familiar with pumping curves (more pressure = less flow, less pressure = more flow ) because it just won't cut it.
then over about 10 PSI you need a ridiculous amount of pressure to get it to work right (140psi fuel pressure?? (10:1 FMU *10 PSI boost +39PSI base pressure)) so at that point you really just need high flow injectors with a modified calibration, because a single pump, or even two in series can't make 140 PSI at full flow.
so by my reasoning, if you want 10+ PSI of boost go right for the best solution, high flow injectors, and since tuning is no longer a problem for the SHO, get any one of the many tuning options to account for the change.
then over about 10 PSI you need a ridiculous amount of pressure to get it to work right (140psi fuel pressure?? (10:1 FMU *10 PSI boost +39PSI base pressure)) so at that point you really just need high flow injectors with a modified calibration, because a single pump, or even two in series can't make 140 PSI at full flow.
so by my reasoning, if you want 10+ PSI of boost go right for the best solution, high flow injectors, and since tuning is no longer a problem for the SHO, get any one of the many tuning options to account for the change.
