GSL-SE Hybrid
04-10-07, 10:56 PM
#1
GSL-SE Hybrid
Okay, this may sound like a rant of what I have in my car but I promise if you power through there are questions at the end. I have a 1969 Datsun 510, it has a 1984 GSL-SE motor and trans in it. I had a donor car so I have all of the electronics and sensors in it. I put a Mazda Speed exhaust which is two pipes from the engine to the mufflers, I Have an Aeromotive fuel pump which produces up to 70 psi and an Aeromotive fuel pressure regulator which will allow for the same amount of pressure. I have also installed an upper and lower intake and plenum from a 91 non turbo Rx7, I have plugged the upper fuel injector ports and am only running the original GSL-SE fuel injectors in the body of the motor. I have the fuel pressure set to 40 psi without the vacuum port hooked up which is what my repair manual suggested, and after the vacuum is hooked up it should drop to around 25 psi (but I haven't kept it running long enough to see if this really happens) . I have hooked the vacuum up but it idles at about 3000 RPM with the mass air flow sensor unplugged, if it is plugged in it will start and die immediately. any help would be very appreciated.
04-10-07, 11:20 PM
#2
welcome to the board. 
preface: i don't have experience with the S5 intakes and electronics.
now, if i read your post correctly, you're running an '84 SE setup (motor and electronics) with an S5 intake setup, so maybe your problem lies with a compatibility with whatever interfaces the manifold and MAF sensor (different voltage values or something). assuming you've exhausted all of the simple stuff (vacuum leaks and such), that would be my best guess.
do you have a copy of the S5 service manual?
preface: i don't have experience with the S5 intakes and electronics.
now, if i read your post correctly, you're running an '84 SE setup (motor and electronics) with an S5 intake setup, so maybe your problem lies with a compatibility with whatever interfaces the manifold and MAF sensor (different voltage values or something). assuming you've exhausted all of the simple stuff (vacuum leaks and such), that would be my best guess.
do you have a copy of the S5 service manual?
04-11-07, 10:02 AM
#3
Hmmm
Thanks it looks like a great resource.
All vacuum leaks have been accounted for. Im guessing that the s5 manifold is the 91 non turbo. Here is what I have done. I took all sensors off of the SE manifold and installed them on the S5 manifold, including the SE tps sensor and air temp sensor. even with a slight vacuum leak it should still run, right? just not well. As for the MAF I also have a 2nd gen one and if it is used it runs at about 3,000 rpm. it acts like there isnt one plugged in. Now here is the trick. I tried both MAFs when I had the GSL-SE intake on and they both ran, the SE MAF made it run better but they both ran pretty well. At this point Im kind of stuck. Do you think it could be from a fuel pressure problem?
All vacuum leaks have been accounted for. Im guessing that the s5 manifold is the 91 non turbo. Here is what I have done. I took all sensors off of the SE manifold and installed them on the S5 manifold, including the SE tps sensor and air temp sensor. even with a slight vacuum leak it should still run, right? just not well. As for the MAF I also have a 2nd gen one and if it is used it runs at about 3,000 rpm. it acts like there isnt one plugged in. Now here is the trick. I tried both MAFs when I had the GSL-SE intake on and they both ran, the SE MAF made it run better but they both ran pretty well. At this point Im kind of stuck. Do you think it could be from a fuel pressure problem?
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