ok so Im gonna purchase some injectors for my turbo teggy,I was leaning toward the 550's, but the 750's are only priced alittle more. how do they idle and who has had experiece wtih tuning those 750's (saturated) are they a pain to tune for part throttle or are they the same as 550's ?

 

bumpity

 

here you go...this should help you with your choice....thats if you know what your doing....

 

Injector Size for Honda/Acura I4
Picking the correct injector size for your Honda or Acura engine is critical when playing with more power. The correct injector size is determined by the horsepower the engine can potentially generate. There is also minor variation based on whether the engine a naturally aspirated or forced induction setup.
Below there are two charts. Each chart has the following things in common:
• The injector sizes listed here are recommended minimums. Always round up: 432cc => 450cc, 216cc => 240cc.
• Engine with 4 injectors.
• Maximum duty cycle of 85% for the injectors.
• Stock fuel pressure.
• Uses the formulas found here: http://www.turbosaturns.net/ar...=7249
... most EL, Civic, RSX, Integra, Prelude, and Accord injectors are 240-310cc. All EL, Civic and Integra (including TypeR's and JDM models) are 240cc saturated injectors. When choosing aftermarket injectors, pick ones that are larger than 240cc, and that are saturated (high-impedance), NOT peak-and-hold (low-impedance) ones.
Naturally Aspirated Engines
Horsepower Injector Size*
@ Flywheel @ Wheels lb/hr cc
0 0 0 0
20 17 3 31
40 34 6 62
60 51 9 93
80 68 12 124
100 85 15 154
120 101 18 185
140 118 21 216
160 135 24 247
180 151 26 278
200 168 29 309
220 185 32 340
240 201 35 371
260 218 38 401
280 234 41 432
300 251 44 463
320 267 47 494
340 283 50 525
360 300 53 556
380 316 56 587
400 332 59 618
420 348 62 649
440 364 65 679
460 380 68 710
480 396 71 741
500 413 74 772
Forced Induction Engines
Horsepower Injector Size*
@ Flywheel @ Wheels lb/hr cc
0 0 0 0
20 17 4 37
40 34 7 74
60 51 11 111
80 68 14 148
100 85 18 185
120 101 21 222
140 118 25 259
160 135 28 296
180 151 32 334
200 168 35 371
220 185 39 408
240 201 42 445
260 218 46 482
280 234 49 519
300 251 53 556
320 267 56 593
340 283 60 630
360 300 64 667
380 316 67 704
400 332 71 741
420 348 74 778
440 364 78 815
460 380 81 852
480 396 85 889
500 413 88 926

Use these numbers when using a turbocharger,
supercharger, or N02/NOS

 

it all depends on your horse power goal. if you want 450hp, get the 750's. but if you're just lookin for 300hp then dsm 450's to 550's are good enough. i'll be running RC550's on my gsr.

 

thanks to everyone, I understand what injectors will support what, but how hard are those 750's to idle and tune? Ive searched h-t and heard stories that anything more than 550's saturated, with tuning will still throw a ton of fuel in at idle and part throttle. All those stories I heard are from people that heard from someone else. I just want to know how true it is and anyone has had any bad experiences with them. I really don't want to wire in a resistor box for peak and hold injectors.

 

well...obviously you don't need to run 750's unless you're planning to go for big HP. is that your insight?

andy (bodykit's nw) got some 800cc injectors to idle fine with aem ems. so i'm guessing depending on your fuel management system will determine how rich you'll be running at idle or during throttle.

i'm sure you can get any size injector to idle with the right settings and the right ems. as long as you're not running past 80% duty cycle on the injectors, it'll be good. if your injectors are too big, they'll just have to tune them down, so it's not necessary to get real big injectors.

 

You can get them to idle just fine.