Injector flow rate for 95-96 G50

[captainluigi]

Where is this info? Thought it would be easy to search but no go.

Anyone know about the 350Z na injector compatibility?

[maxnix]

Think the turbo ones might be the same. Are you getting a Z32 TT?

Q45tech mentions flow rates in a couple of his posts. 370 cc?

[lino]

Check out Wes' post:zerothread?id=250347

Deachwerks Phase 1 Injectors:

[captainluigi]

Thanks lino, I knew it was out there somewhere.

[lino]

Anytime.

[tmorgan4]

Wow...the injectors I got from Deatschwerks have quite a bit higher numbers than the sheet posted above. Every injector tested at over 400cc/min with the average being 408cc/min. Minimum was 405cc/min, maximum was 412cc/min.

[Q45tech]

Worn injectors will flow more fuel or out of spec factory rejects.

Unfortunately all we have is early 370cc info from flow tests.

Could be that the colored markings on injectors indicated matching flows from actual tests to perfect the engine idle?

At cruise the ecu/O2 can trim the injector open time up to +- 20% to correct the average for a bank of injectors.

400/370 is 8% well within correction range................look at adaptive learn % to see what is happening.

If every HP or MPG is desired then accurate balanced injectors are the first place to start.

At WOT injector opening is preprogrammed and not trimmed by O2 so you could be 8% richer than with 370cc units. Luckily excess richness has only a minor reduction [4%] in power output.

[Q45tech]

The problem occurs when an injector is replaced without knowing its flow rate or the flow rates of the remaining old worn injectors.

At idle a balanced flow rate is necessary for a smooth idle, so power balance test should be conducted and some determination as to whether any rpm imbalance is from injectors or piston ring wear [low compression].

New plugs, clean injectors [BG44k] and individual cylinder compression test looking for correlation.

By the way the fluids used to test injector flow may not match the viscosity/specific density of the pump gasoline you buy from day to day.

Note: 0.696@25C in the test sheet you must be prepared to measure your gasoline at 25C and correct the flow rate vs that given in test results.

Gasoline, Vehicle 60F 0.739 Toluene 25F 0.865 Alcohol, ethyl (ethanol) 25F 0.787

http://www.oseco.com/pages/abo...s.pdf

Unleaded street gasoline, regardless of the octane rating, should have a specific gravity of 0.720-0.780. As was established earlier, no two loads of fuel delivered to a gas station have the exact same density!

[NOR*CAL 916]

use SR20DET injectors, same 370cc flow rate, there direct drop in, and there OEM Nissan parts plus there usually low mileage units from japanese imports.

[Q45tech]

SR20 DET, 300zxtt, Q45, some older Subaru Flat 6 SVX all had side feed 370cc injectors.

Hard to tell them physically apart from the 280 cc [red top] used on most other Nissan 90-96

[maxnix]

My flow rates (1995 rotary disc - 60K miles - BG44K) are between 402 and 408 at 100% IDC, 4@402 2@406 1@404 1@408 for ±0.7%

[captainluigi]

Very good info to know!

Thank you Guru

[UNISA JECS]

Wow...the injectors I got from Deatschwerks have quite a bit higher numbers than the sheet posted above. Every injector tested at over 400cc/min with the average being 408cc/min. Minimum was 405cc/min, maximum was 412cc/min.

My flow rates (1995 rotary disc - 60K miles - BG44K) are between 402 and 408 at 100% IDC, 4@402 2@406 1@404 1@408 for ±0.7%

I assume thats these are from the later G50 Q45 flow rates or the 02/93 thru 96 injectors in this screen shot:



and did they look like these, these are from late model G50 Q45's:

[maxnix]

Later 1995 in my case.

[UNISA JECS]

Later 1995 in my case.

Cool, I know you cant see the years in that screen shot but those are all the parts number between 02/93 and 96 that all interchange with one another. So one can conclude that since they are interchange/supercede eachother that they are characteristally the same (hence teh alternate part number).

The 67U10/11/12 are 1996The 67U00/01/02 are 02/93 - 10/96

And they all are interchangable with the 67U10/11/12 injectors as per NISSAN FAST.

I have found that all the G50's with teh "grill" use the later style injectors, thats a free tip to anyone that didn;t know that already.

[maxnix]

Yes, the later (1994+) injectors are rotary as opposed to single pintle, and require different rails to mount.

Read Heath's (1990Q45), Wes' (elwesso) and TexasOil's (in IOM) about the later injectors and adapting them to earlier installations.

[Q45tech]

As we keep pointing out cruise and WOT are immaterial in reasonable injector differences since adaptive trim compensates.

Idle is where the problems occur from a 10% flow difference.

Measuring max flow is confusing and somewhat useless since Q WOT is only 66% duty cycle [at worse case 4,000 rpm] open so a 370cc actually flows ~~ 244 cc per minute and declines further to HP and still further at redline to about 56% or 207 cc/min.

The question is how linear is the graph from idle and cruise where the 34 psi is used vs WOT 43.4 psi which should be a ~ 13% decrease if flow vs time..

To me testing at 43.4 psi and 100% is attempting to fool consumer but there must be some standard across the industry for uniformity.

[UNISA JECS]

I was just looking for a reliable source on the cc/min flow of these particular injectors, I have been using them in my boosted KA24DET for over a year with no problems as well as the Q45 fuel pump also.

Seems that these injectors have a different injector latency than the "370cc" from the S13 SR20DET and the Z32 VG30DETT.