gurus....



i am off to get my vortech custom mapped tomorrow, and wanna know what the 'ideal' ratio i should be shooting for, in advance....


not to discredit the tuner, but im wanting to have numbers already on tap, for comparison purposes.....

as well as having a powerful build, i wanna have a SAFE setup too...

for now, im running with oem exhaust and cats, if it matters... i will likely be back to the dyno (same one too, i imagine) when the crawford cats, and fujistsubo Y /midpipe & muffler are installed...

can i get some advuce please???

thnx

sms

ps- what size bung is needed for the aem wideband setup?? (havent figured that out yet either)

 

forgot to mention....

this setup is using the stock vortech pulleys.....

for now....... (corvette pulley and shim, maybe after exhaust)

 

12:1 ratio is key when you are not at idle. This should be pretty much across the whole RPM band. With a SC it will be ok to run a little lean, no more than 12.5:1 before about 3 psi of boost.

 

what about at max boost?? (assuming the s/c WILL create more than the 7lbs it shows on the dials now)??

thnx

eS

 

Standard O2 bung, M18X1.5

-D

 

personally, i dont like to go too rich at lower RPM, becuase you loose lots of torque and snappiness. So I would start at 13.5:1 at maybe 3000rpm, and gradually and progressiveliy work your way down to 11.5:1 at 5000rpm....I would shoot for a flat 11.5:1 from 5000rpm to redline...roughly. Especially with an SC, which progressively builds boost and peaks and redline...your fuel curve should follow that. A TT is slightly different, in that it hits peak boost at 3000rpm or whatever...so you need to get richer quicker..

11.5:1 is on the "safe" side of peak torque/power. You leave a little bit on the table, but you give yourself an extra margin for error, to account for a bad tank of gas, ambient temp changes, voltage fluctuation, etc...etc...

 

thanks ......

i changed the plugs to 1° colder already, to help ensure the safety/longevity......

lets see what numbers the tooner comes up with....... (maybe i should relay this info prior)

-eS

 

esemes....The guy that tuned my car has been doing it for 25 years , F/I and N/A race cars .Races himself . He did tell me that 11.8 to 12.2 to 1 is Ideal for F/I and 12.8 to 1 for N/A .Let us know how it turns out