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Forum nameTurbo/Nitrous Tech
Topic subjectduty cycles and pressures for 310s and 335s?
Topic URLhttps://forums.2gnt.com/dcboard.php?az=show_topic&forum=i8&topic_id=83583
83583, duty cycles and pressures for 310s and 335s?
Posted by cyan, Mar-10-05 08:36 PM
shit yea, another injector question. i need some to throw in for a while until i can afford the time and money for the MS and some huge injectors, does anyone know the duty cycles and idle/boost fuel pressures for 310s and 335s at 12psi and 15psi boost? i'm not interested in 440s because of the questionability of idle...but the idea is to run 12psi daily and 15psi every now and then and i'd like to know which of these two sizes will provide the better balance between idle and low boost fuel pressures (ie, below 100psi). keep in mind, i'd like to "TRY" to accomplish this with the, ahem, cartech. i dont want to spend $300 on a SFMU that ill be ditching in 6 months to a year for a 1:1 with the MS.
yes, this is very much a quick fix, or cheap way out. but if it's absolutely impossible to tune this with the cartech i can get the SFMU.

btw, i found the following:
You can run with 315 up to 14.5 psi at exactly 100 psi of fuel pressure.
Fuel Pressure - cc/min - lbs/hr - hp - cc/min - lbs/hr - hp - boost PSI - lbs/hr - @DC - hp@DC

30.0 262 24.91 190 266 25.37 193 -1.1 29.85 227
35.0 283 26.91 205 283 26.91 205 0.0 31.66 241
40.0 302 28.77 219 298 28.37 216 1.1 33.37 254
43.5 315 30.00 229 308 29.34 224 1.9 34.52 263
45.0 320 30.51 232 312 29.75 227 2.2 35.00 267
50.0 338 32.16 245 326 31.07 237 3.3 36.56 279
55.0 354 33.73 257 340 32.34 246 4.4 38.05 290
61.5 375 35.67 272 356 33.92 258 5.9 39.91 304
65.0 385 36.67 279 365 34.74 265 6.7 40.87 311
70.0 400 38.06 290 377 35.88 273 7.8 42.21 322
75.0 414 39.39 300 388 36.98 282 8.9 43.51 332
80.0 427 40.68 310 400 38.06 290 10.0 44.77 341
85.0 440 41.94 320 411 39.10 298 11.1 46.00 350
90.0 453 43.15 329 421 40.11 306 12.2 47.19 360
95.0 466 44.33 338 432 41.11 313 13.3 48.36 368
100.0 478 45.49 347 442 42.07 321 14.4 49.50 377
105.0 489 46.61 355 452 43.02 328 15.6 50.61 386
110.0 501 47.71 363 461 43.94 335 16.7 51.70 394
Try and read that graph it goes right across

does anyone have this same type of chart for 335s?

EDIT: nevermind about the duty cycles, i just remembered mine are going to be 100% because i'm not using a SAFC
83607, RE: duty cycles and pressures for 310s and 335s?
Posted by SilverBullet20g, Mar-11-05 10:31 AM
I wouldn't even try to manage that craptech or let alone try to dyno it. We would do a couple pulls and the fuel pressure would change without us doing anything..what pos and waste of dyno money.

When I had 335s, FMU and SAFC I could run 14psi without it running lean on the dyno. I suppose this doesn't help because you don't have the SAFC..
83614, RE: duty cycles and pressures for 310s and 335s?
Posted by cyan, Mar-11-05 11:07 AM
that's what i thought, i did alot of reading last night and some people say 310s can go to 13-14psi and others say they are only good to 10psi. then others say to get to 15psi you MUST have at least 370s. everyone either has a different opinion or has had different experiences. i wonder how difficult it will be to run 335s up to 13-14psi with a SFMU but no AFC? that would be the ideal setup for me for the time being...not to expensive, but not overly difficult to tune.
83634, RE: duty cycles and pressures for 310s and 335s?
Posted by DSMRoadster, Mar-11-05 04:24 PM
I have 315cc and I run 15psi daily. On a hot day, you'll lean out pretty quick in 5th wot. On a cold day, you'll be fine. You'll still reach 1600f pretty quick though.
83658, RE: duty cycles and pressures for 310s and 335s?
Posted by cyan, Mar-12-05 01:51 PM
that's what i wanted to hear. i'll probably just go with those then. what disc and spring are you using now? and i assume you have the bleed valve installed as well? i'll just grab the bleeder valve from the cartech so it can at least make one good contribution to the car