Thread: Inj Size And WHP Output,

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This is a conservative rating at 3 bar. * indicate side feed or top feed inj sizes that can be bought from Nissan, Nismo or Tomei. Alot of the sizes you can not get but are there to help you if you are looking at a cetain flow rate by going to 4 bar.


3 BAR = 44 PSI, All the Nissans with Fuel Presure Regulators operate at 3 bar.

4 BAR = 59 PSI Running at 4 bar is better than running at 3 bar. Here is why, you can get more WHP from your inj at 4 bar, there is no xtra cost for a 4 bar program from JWT, you get better drivability at 4 bar because of better fuel atomization and you car will do better at the emmisions station becasue of better fuel atomization.

All Nissan Side feed injs are high impedence

For Low Impedance injs use 6.8 ohms 10 watt resister

The GTIR 444cc Inj is low impedence

91-99 USDM SR20DE = 259 cc side feed injs
00-02 USDM SR20DE RR = top feed injs

U12, U13, W10 and W11 SR20DET = 370 cc Side Feed injs
Pulsar GTIR SR20DET = 444 cc Top Feed injs

S13 and S14 RWD SR20DET =370 cc Side Feed injs
S15 RWD SR20DET = 444 cc Side Feed injs

SR20VET = 444cc Top Feed
SR20VE 20V = 350cc Top Feed
VR38DETT = 570cc Top Feed

Side Feed Injs

23 cc = 16 WHP
46 cc = 31 WHP
93 cc = 63 WHP
139 cc = 94 WHP
185 cc = 125 WHP * Pink GA16
---------------------------------------------185 cc @ 4 bar = 142 WHP
231 cc = 156 WHP
259 cc = 175 WHP * Red SR20DE
---------------------------------------------259 cc @ 4 bar = 203 WHP
278 cc = 187 WHP
324 cc = 218 WHP
333 cc = 226 WHP * Grey SR20VE
---------------------------------------------333 cc @ 4 bar = 261 WHP
370 cc = 250 WHP * Purple SR20DET
---------------------------------------------370 cc @ 4 bar = 290 WHP
416 cc = 281 WHP
444 cc = 305 WHP * Brick Brown SR20DET ( S15 )
---------------------------------------------444 cc @ 4 bar = 351 WHP
462 cc = 312 WHP
509 cc = 342 WHP
555 cc = 373 WHP * Yellow
---------------------------------------------555 cc @ 4 bar = 423 WHP
570 cc = 380 WHP * BLUE R35 GTR
---------------------------------------------570 cc @ 4 bar = 440 WHP
601 cc = 405 WHP * Yellow Tomei
---------------------------------------------601 cc @ 4 bar = 457 WHP
647 cc = 436 WHP
692 cc = 468 WHP
740 cc = 500 WHP * Red
---------------------------------------------740 cc @ 4 bar = 580 WHP

850 cc = 570 WHP SARD
---------------------------------------------850 cc @ 4 bar = 660 WHP

Nissan Top Feed Injs

350cc = 240 WHP * GREEN SR20VE 20V P12

444cc = 299 WHP * YELLOW RNN14 GTIR

444cc = 299 WHP * YELLOW SR20VET

570cc = 380 WHP * BLUE R35 GTR




MSD Top Feed Injs

36 lb = 250 WHP
50 lb = 355 WHP
72 lb = 520 WHP
96 lb = 690 WHP

MSD Injs do not run right at 4 bar so don't try it.


04-07 Subaru STI Yellow Inj
520 cc = 350 WHP

Sticky sticky...

Maybe we could start adding the injector latencies for certain injectors, at certain voltages?

Someone asked the question this morning and I got the answer, but I think it would be a good idea to add to this list.

For instance:
740cc Deatschwerks Injectors (Manufacturer's data)
1.94ms @ 9VDC
1.71ms @10VDC
1.57ms @ 11VDC
1.4ms @ 12VDC
1.3ms @ 13VDC
1.22ms @ 14VDC

^This is a good idea. We even a flywheel info thread, I know we can get one of these going.

does anyone know what size/flow rating these are?

They are 259cc injectors, last I had checked.

is it just the msd top feed injectors that dont like 4bar or all top feeds?

Just the MSD's IIRC. I haven't heard of anyone locally running with topfeeds other than MSD's at over 59psi of pressure having issues.

Taken from up top.

i understand that. so its just the MSD injectors?

I am trying hard to understand why this is so hard.

My quote below form the begining of the page.





Now if you read the last line it clearly states MSD Injs do not run right at 4 bar so don't try it.

I does not say Nissan, MSD and some other brands do not run right at 4 bar so don't try it.