New vs old style injectors

The Nissan 300ZX (Z32) general community discussion forum
z.Leinbach
Posts: 504
Joined: Thu Aug 06, 2015 10:08 pm
Car: 1990 Nissan 300ZX NA T-top
Location: Kennewick, Wa
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Since my car has ate the middle injector on the driver bank again (has dermal cheat marks on a couple). They are still the old style injectors, is there any increase in mpgs, power, anything other then durablity compared to the old style, need to know asap, that cylinder is dying


nissanfreak12
Posts: 1709
Joined: Sun Jan 23, 2011 4:07 pm
Car: 92 300zx 2+2 TT
Location: Denver, CO

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Better fuel atomization, smoother idle, less prone for failure due to ethonal. Pintle less (4 little holes vs 1), worth doing the swap, but yes they do fail, just not as often.

No gain on HP, helped with my fuel economy. Peace of mind was enough for me.

z.Leinbach
Posts: 504
Joined: Thu Aug 06, 2015 10:08 pm
Car: 1990 Nissan 300ZX NA T-top
Location: Kennewick, Wa
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How much of a mpg gain did you notice? An with the new style will it hurt anything to upgrade 1. At a time?

nissanfreak12
Posts: 1709
Joined: Sun Jan 23, 2011 4:07 pm
Car: 92 300zx 2+2 TT
Location: Denver, CO

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Lets put it this way, I was averaging 22mpg on my TT on new style when I averaged 20 in my NA with old style. More hp and better MPG. Does that mean you will see a difference, all depends on how you drive. I immediately noticed a smoother Idle.

Putting a new style in the mix of an old style, you may or may not feel it. I don't think there will be an issue. Its just best to replace all of them so you don't have to do more work than needed.

z.Leinbach
Posts: 504
Joined: Thu Aug 06, 2015 10:08 pm
Car: 1990 Nissan 300ZX NA T-top
Location: Kennewick, Wa
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Well I guess I will have to find out, tomorrow I'll be ordering one from Z1 with the adapter kit and everything for that one, unfortunately can only do one at a time currently, but I'll keep a running update. Any write ups on how to set up everything while the plenum is still on? The runner already has the cheat mark made

z.Leinbach
Posts: 504
Joined: Thu Aug 06, 2015 10:08 pm
Car: 1990 Nissan 300ZX NA T-top
Location: Kennewick, Wa
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Well it did help the issue slightly, but did a compression test and it was at 118psi but would hold at that amount, so I guess it's time for a new engine eventually in the next year

z.Leinbach
Posts: 504
Joined: Thu Aug 06, 2015 10:08 pm
Car: 1990 Nissan 300ZX NA T-top
Location: Kennewick, Wa
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Well it did help the issue slightly, but did a compression test and it was at 118psi but would hold at that amount, so I guess it's time for a new engine eventually in the next year

Zedx32
Posts: 37
Joined: Sun Jul 19, 2015 11:31 am
Car: 1992 z32
Location: Annapolis, MD

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I have the new style injectors and the adapter kit from Z1. I can't say that theres any performance difference but my friend has a 1990 na z32 with the original old style injectors and he constantly complains about gas mileage, he averages about 190 miles on a single tank. I myself average about 240 miles on a tank. There are a million other variables when it comes to fuel consumption, but we're both lead foots with a similar driving style. I'm not certain that it's all because of the injectors, but I'm sure they help a great deal.

z.Leinbach
Posts: 504
Joined: Thu Aug 06, 2015 10:08 pm
Car: 1990 Nissan 300ZX NA T-top
Location: Kennewick, Wa
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Holy crap, I'm am in between those most times, and I've noticed that it feels better and is slightly more responsive, but still idles hella rough, and at idle runs on 5 cylinders, middle on the driver bank was at 118


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