2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
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View Poll Results: your injectors?
venom
1
3.03%
delphi
1
3.03%
sard
0
0%
deatschwerks
1
3.03%
bosch gen1
1
3.03%
bosch gen2/3
6
18.18%
denso
13
39.39%
RC
10
30.30%
greddy/trust
0
0%
Other
7
21.21%
Multiple Choice Poll. Voters: 33. You may not vote on this poll

Fuel injectors: the good, the bad, and the ugly.

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Old 10-03-11, 08:03 PM
  #26  
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Originally Posted by tuscanidream
Nice. What mods you running?
Haltech e6k for engine management.
RB Rev II Exhaust, random cone intake, 255lph Fuel pump, BNR Stage 4 turbo, Stock Block, stock TMIC (yea I know...)

I was making 240hp @ 12psi (I think, it's been a while and that boost number might be wrong by a few psi) on the dyno before my engine took a ****. My tuner said I could have reached 300hp easily (around 20psi if I recall properly). I could probly make around 320-340 with a FMIC just because the intake temps were getting retarded with the TMIC. Just too much air for the thing to work properly even with ice and a fan on it.

The Injectors themselves should be good up to about 500hp before they run out of juice, so I have plenty of fuel, which is always good to know on a rotary
Old 10-03-11, 08:10 PM
  #27  
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Originally Posted by FullFunctionEng
\
WTF is this 1:10 ratio you keep bringing up? I don't understand what that means... ID's are matched dynamically in batches of more than 200 injectors at a time. There is a standard and they do have waste from each and every batch that does not meet their standard. Not sure where you got that misinformation from...

I got it from this:

Originally Posted by FullFunctionEng

This is a deviation vs. pulsewidth chart for every 10th injector out of a batch.]
maybe I read that wrong, but it seemed like you were saying that there is deviation for every 10th injector, thats 1:10 correct?

I wasnt aware of the modifications to the 1000s- can you go into more detail as to what exactly is done to them?

Do you provide the testing sheets with each pair or set of injectors? I had a pair but got them from another vendor and I didnt ask for one but it seems to be a big selling point of yours.
Old 10-03-11, 08:34 PM
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That chart shows how 10 randomly selected injectors match up out of a batch of 100 (unmatched and straight from Bosch). This is to show how much deviation can be present when you do a "grab bag" approach which is what that article is trying to address.
Old 10-04-11, 12:08 AM
  #29  
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Originally Posted by Osirus9
Haltech e6k for engine management.
RB Rev II Exhaust, random cone intake, 255lph Fuel pump, BNR Stage 4 turbo, Stock Block, stock TMIC (yea I know...)

I was making 240hp @ 12psi (I think, it's been a while and that boost number might be wrong by a few psi) on the dyno before my engine took a ****. My tuner said I could have reached 300hp easily (around 20psi if I recall properly). I could probly make around 320-340 with a FMIC just because the intake temps were getting retarded with the TMIC. Just too much air for the thing to work properly even with ice and a fan on it.

The Injectors themselves should be good up to about 500hp before they run out of juice, so I have plenty of fuel, which is always good to know on a rotary
stage 4 at 12 psi lol
they are way more efficient at 15+psi. Though on the tmic, that is going to be pushing it. At 17psi a stage 4 will push around 350hp
Old 10-04-11, 07:18 AM
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Originally Posted by FullFunctionEng
That chart shows how 10 randomly selected injectors match up out of a batch of 100 (unmatched and straight from Bosch). This is to show how much deviation can be present when you do a "grab bag" approach which is what that article is trying to address.
so they are then matched to each other, gotcha.

what are the modifications done to the 750s and 1000s?
Old 10-04-11, 10:16 AM
  #31  
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Originally Posted by Black Knight RX7 FC3S
stage 4 at 12 psi lol
they are way more efficient at 15+psi. Though on the tmic, that is going to be pushing it. At 17psi a stage 4 will push around 350hp
if you read what I wrote, you would notice that the reason I didn't run more boost was because my engine exploded during tuning... thus the guessing at numbers and lack of a dyno sheet.
Old 10-04-11, 11:29 AM
  #32  
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i also found some accel injectors. they also look like repainted denso injectors however...
Old 10-04-11, 05:36 PM
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dropped the injectors off to get flow tested, initial results are not too hot. only 5% variance 25%DC and the spray pattern of two of the injectors were garbage
Old 10-04-11, 06:15 PM
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Originally Posted by arghx
Greddy injectors are rebadged Denso
They don't go through much trouble to re-badge them, mine still have the desno part # in plain sight.
Old 10-05-11, 06:29 AM
  #35  
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so do the injector dynamics come peak and hold or all saturated

any idea on trickflow fuel injectors? I know trickflow is a big name with the mullet heads (mostly ford guys) and there products like aftermarket heads/intake quality enough to use on their race cars.
Old 10-06-11, 12:10 PM
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Injector Dynamics are all saturated.
Old 10-06-11, 01:33 PM
  #37  
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not going standalone any time soon soooo ID is out =[
Old 10-06-11, 02:55 PM
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Rtek 1.8 will handle id 720cc injectors, or any 720 injectors, as for 1000cc, I dont see why not it wouldnt work, it should. Its within the safc adjustment range.
Old 10-06-11, 03:41 PM
  #39  
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Originally Posted by Black Knight RX7 FC3S
Rtek 1.8 will handle id 720cc injectors, or any 720 injectors, as for 1000cc, I dont see why not it wouldnt work, it should. Its within the safc adjustment range.
I agree. The only reason not to go with ID injectors imo is cost.

if you're poor, then get something else. But I went ahead and spent the extra ($460 for new 4x1000cc) and never looked back. They even have the added benefit of using different o-rings that are much thicker and stronger to reduce fuel leaks. I know I have had a lot of issues with tearing those damn injector o-rings and getting fuel leaks on my LIM. Maybe I'm the only one, but that was a big plus for me.

also, I know I sound like a spokesperson for ID or something. I'm not. I'm not affiliated with them in any way. I just like their product.

EDIT - you will be able to tune out the extra fuel from bigger injectors using your SAFC easily. I know because I've done it.
Old 10-06-11, 07:34 PM
  #40  
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s4 car bros, peak and hold injector drivers
Old 10-06-11, 08:22 PM
  #41  
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Originally Posted by gear_grinder
s4 car bros, peak and hold injector drivers
remove the resistor pack...
Old 10-06-11, 08:30 PM
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the drivers are not the same, especially if you examine the wave form on a scope.... removing the resistor pack would not solve this problem......

whats up with the "5" under my screen name lol?
Old 10-06-11, 10:10 PM
  #43  
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It will work. If it works for countless others with no problem, it will work for you.
Old 10-07-11, 07:03 AM
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.... knowing what i do about how injectors work and the differences in how the drivers wave forms are it seems like a poor idea. The accuracy of the injector timing and duty cycle would become compromised, IE run like garbage...
Old 10-07-11, 09:33 AM
  #45  
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Originally Posted by gear_grinder
.... knowing what i do about how injectors work and the differences in how the drivers wave forms are it seems like a poor idea. The accuracy of the injector timing and duty cycle would become compromised, IE run like garbage...
generally the difference is unnoticable.

*shrug*
Old 10-07-11, 11:01 AM
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Seems like one of those things that "matter" on paper, but not so much in real life....kinda like pulsation dampeners.
Old 10-07-11, 11:48 AM
  #47  
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Originally Posted by gear_grinder
whats up with the "5" under my screen name lol?
yea wtf? Sharingan has one too

I want one!

... I think... unless they mean something bad lol

EDIT - actually a lot of people have them... wonder what that's all about
Old 10-07-11, 12:49 PM
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its a 5 year member ship thing, I want my 10 year next year!!!
Old 10-07-11, 12:58 PM
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Originally Posted by Black Knight RX7 FC3S
its a 5 year member ship thing, I want my 10 year next year!!!
is it?

*looks at his join date*
Old 10-08-11, 12:55 AM
  #50  
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fuwaaaa


owning the same rx7 for 5yrs should earn somthing....


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