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750's on a SAFC II

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JAD3D

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Discussion starter · #1 ·
"I'm trying to tune in my 750's on a safc II The supporting mods i have are, evo III Big 16g , FMIC, 750's and a supra fuel pump, with 2.5 turboback exhaust, with mbc, i'm looking to get it tuned in at 18psi. Im also about to buy a fpr here soon, still running on the stock 2g maf.

can anyone give me a decent guidline to set the safc out?
 
#2 ·
I have read anything bigger than 650's are not recommended on an safc, good luck its hard to say how it will work out. 650's will be perfect on an evo 16g @ 18psi or even 21psi. You might want to ditch the 750's? Do yourself a favor and buy a good afpr.
 
Discussion starter · #5 ·
So it would be less of a headache to get 650's and stay at what i'm looking to get at 18-21 psi is my goal. I just wanna break 8's in the 1/8 mile is all...


If anyone has any 650's they wanna trade im game!
 
Discussion starter · #7 ·
Once I get that i'll be able to tune just like their 680's?

Just tune with that safc and get everything running good at 18psi for next week at the track. I WANT 8's!!!!!
 
#12 ·
oldman said:
Get that AFPR and drop your base pressure to 36psi, this will make your 750s run like 680s, you will need the AFPR anyway.
Click to expand...
I disagree... Base pressure on a 1g is supposed to be set at 37.5psi, i doubt dropping it 1psi will make 750CC injectors flow like 680CC injectors.. Dropping pressure a bit would make the injectors flow less but not to 680cc, and even if it did drop it a little it'd still be to much for an afc.. He needs 680CC injectors if he's running an afc.
 
#13 ·
JAD3D said:
no, I have a logger, I mean, Just using a SAFC/Logger and not using dsmlink and or something like that.
Click to expand...
It can be done but it will take skills since you can't logged knock count and your timing will be way advanced due to hidden air flow, read and study before you proceed.
 
#15 ·
Burnett03 said:
I disagree... Base pressure on a 1g is supposed to be set at 37.5psi, i doubt dropping it 1psi will make 750CC injectors flow like 680CC injectors.. Dropping pressure a bit would make the injectors flow less but not to 680cc, and even if it did drop it a little it'd still be to much for an afc.. He needs 680CC injectors if he's running an afc.
Click to expand...
He has a 97'.

New flow rate = old flow rate x SQRT( new pressure / old presure)

680 = 750 x SQRT(new pressure/43.5)

.9067 = SQRT(NP/43.5)

.822 = NP/43.5

NP = 35.8 psi
 
#16 ·
oldman said:
He has a 97'.

New flow rate = old flow rate x SQRT( new pressure / old presure)

680 = 750 x SQRT(new pressure/43.5)

.9067 = SQRT(NP/43.5)

.822 = NP/43.5

NP = 35.8 psi
Click to expand...
Damn the oldtimer can do some math.

That's some complicated shit for 3:14 in the morning.
 
#18 ·
oldman said:
He has a 97'.

New flow rate = old flow rate x SQRT( new pressure / old presure)

680 = 750 x SQRT(new pressure/43.5)

.9067 = SQRT(NP/43.5)

.822 = NP/43.5

NP = 35.8 psi
Click to expand...
IMO it's still not the best route to go.. 750s are to big for an afc. If he does this and makes them 700cc they will still be to much. He'll be taking out so much airflow the ecu will advance timing like crazy.
 
#19 ·
Burnett03 said:
IMO it's still not the best route to go.. 750s are to big for an afc. If he does this and makes them 700cc they will still be to much. He'll be taking out so much airflow the ecu will advance timing like crazy.
Click to expand...
Where did 700 come from?

So the question you are raising is basically "Can 680's be tuned by SAFC alone?", is it difficult? Yes. Impossible? Certainly not. Is it the best route? Obviously not or we won't be talking about SAFC.
 
#20 ·
oldman said:
Where did 700 come from?

So the question you are raising is basically "Can 680's be tuned by SAFC alone?", is it difficult? Yes. Impossible? Certainly not. Is it the best route? Obviously not or we won't be talking about SAFC.
Click to expand...
700 was just a number i threw out. I tuned 680's with an afc before, it was tricky but dooable. I'm unsure why people even mess with the safc when dsmlink is available.
 
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