sr lack of power/acceleration below 3500 rpm

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abaron13
Posts: 27
Joined: Wed Mar 16, 2011 12:33 pm
Car: 1992 Nissan 240sx
Location: Cleveland

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Ok, this is what I'm running:
-sr20det redtop
-fmic
-tubular manifold and full 3" exhaust
-greddy rs bov
-255lph fuel pump

My problem is when accelerating from a stop I have almost no power until I hit around 3500 rpm and then I hit boost and have enough power to smoke the tires. It's like this in every single gear: no power until 3500, and then it's like someone flips a switch and I have all the power I need. What could cause this lack of power? It's really getting annoying, especially in traffic. Doe anyone have a solution, or maybe could point me in the right direction??


sonny1335
Posts: 47
Joined: Wed Aug 17, 2011 10:02 pm
Car: 1993 240sx coupe RB20
Location: Iowa

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what are your plugs gapped to? recirculated bov or open? boost leaks? how long has it been doing it? did you mess with anything recently?

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abaron13
Posts: 27
Joined: Wed Mar 16, 2011 12:33 pm
Car: 1992 Nissan 240sx
Location: Cleveland

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plugs are new and gapped to .28. open bov, no boost leaks, and it's been doing it since I got the car a couple months ago, its just worse at some times more than others, especially when its cold. But i have no power to the point that the car almost stalls starting from a complete stop.

compactfean
Posts: 2602
Joined: Thu Dec 03, 2009 10:28 am
Car: 89 240sx s13 sr gt3071r 23psi
B14 sentra ser sr20de-t 7psi
daily
Location: reno nv

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Id say your injectors are getting lazy.

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abaron13
Posts: 27
Joined: Wed Mar 16, 2011 12:33 pm
Car: 1992 Nissan 240sx
Location: Cleveland

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compactfean wrote:Id say your injectors are getting lazy.
I just checked the resistance of my injectors and I got some pretty messed up readings:

1: 16.4 ohms
2: 11.5 ohms
3: 2.9 k ohms
4: 11.2 ohms

It's my understanding that they should all be close to 11 ohms and certainly close to one another, correct?

Why are my readings so off? Time for new injectors?

compactfean
Posts: 2602
Joined: Thu Dec 03, 2009 10:28 am
Car: 89 240sx s13 sr gt3071r 23psi
B14 sentra ser sr20de-t 7psi
daily
Location: reno nv

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Not sure what the specs should be off the top of my head but definately should all be very close to each other! Id say time for a new set.

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abaron13
Posts: 27
Joined: Wed Mar 16, 2011 12:33 pm
Car: 1992 Nissan 240sx
Location: Cleveland

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can I run 444cc injectors on a stock tune? I can get a better deal on s15 injectors than the stock 370ccs....

compactfean
Posts: 2602
Joined: Thu Dec 03, 2009 10:28 am
Car: 89 240sx s13 sr gt3071r 23psi
B14 sentra ser sr20de-t 7psi
daily
Location: reno nv

Post

Its possible but probably won't run very well. You will run hella rich. If your ecu is chipped just get a new tune with them.


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