Hey guys:I have a question. I was told thru the grape vine that the 72lb inj program runs smoother than the 50lb inj program.What i mean is, they told me that the idle is smoother, power band is more smooth, the motor responds better during shifts, etc, etc... Im just curious to know if this is true or not...??
I want to upgrade my fuel system, but in order to run the 72lb injectors, I have to upgrade my fuel rail. I dont wana do that cause im not gonna push more than 15 psi thru my ka. And i know that the oem ka dohc fuel rail will flow enough fuel to support 15 psi from a T04B compressor... Why change it out if i dont have to...
Anyways, back to the 1st statement... Is this a rumor or is it true..??
ThanksRobert
JWT ECU programs
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klattr1
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hey
supposedly the 50lb injector programs do not have as much development time but i am sure you are thinking more along the lines of the 4 bar fuel pressure program(unstable idle).They will do 740cc side feed injector programs also. These injectors will drop right in(new o-rings for sure though).MSD style injectors are a little more affordable than 740cc side feed injectors. You could pretty much buy MSD 72lb injectors and a top feed fuel rail(JGY) for the price of 4 740cc side feeds. These are all brand new prices so its just a matter of options. The other thing to keep in mind is what mafs you would facilitate. Jim Wolf could just send you out another chip to run the z32 mafs program for whatever injector you wish. On the other hand, there will downtime and extra money spent for the subtractor circuit addition in cobra mafs 72lb injector program(that means waiting 2 months for your ecu that you sent to them and your car is dormant).The driveability of my car with the cobra mafs and 72 lb injector with stock fuel pressure program is perfect. No problems whatsoever(idle,etc)
JGY customs told me that they have a lot more development time with the cobra mafs than the Z32. I just got a Z32 mafs too, and I'm having my ecu burnt for that and the msd 50's. And if it doesnt' run right I'm sending it back and having them redo it till they get it right.poooooooooooooooooooooooooooo and pray.
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rn240sx
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OK, i guess my mind is set on the 72lb injector program:
What brand injectors ( 72 lb ) will drop right into the oem dohc fuel rail..?? And where can i get them at a descent price..??What mafs ( z32 or cobra ) will I need to hit the low to mid 300 rwhp range..?? And if it is the Z32 maf, does it have to be a turbo 300zx within a certain yr range..??
ThanksRobert
What brand injectors ( 72 lb ) will drop right into the oem dohc fuel rail..?? And where can i get them at a descent price..??What mafs ( z32 or cobra ) will I need to hit the low to mid 300 rwhp range..?? And if it is the Z32 maf, does it have to be a turbo 300zx within a certain yr range..??
ThanksRobert
I dont know of any drop in 72# injectors, those are all domestic style top feeds. However, you could drop in some 740cc side feeds that are capable of the same if not more than 72#'s...more expensive than 72's plus a top feed rail though. I prefer the Z32 maf myself, no "subtractor" circuit, and I know where to get them easily. You want one from either an NA or TT Z32 (300ZX) and they might be the same for a J30 as well. The biggest key is to look at the sticker on the side of it with the part number, it should end in N62, if it says anything else you do NOT want it. Usually you'll see either N62 or N60 but I've seen an E60 one that looked almost identical too that came off a VQ30 motor. For a decent price on 72# injectors check out http://www.racetronix.com
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klattr1
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hey
i sent you an email with more info.Basically there is no downtime with Z32 mafs and 740cc side feeds since all they have to do is send you out a chip. But i'm not sure about the driveability with that setup(development time).My cobra mafs and top feed 72lb injector setup has great driveability but it costs an extra $125 for the subtractor circuit and it took forever.
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rn240sx
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I currently have the 370cc injector program with the stock maf.. It works fine, but i do have idle problems but ONLY when I do this:
I rev up the motor to about 6500 rpm and release the throttle, then the needle will drop down to about 300 ish rpm where it will either A: stall out, B: go up to about 1000ish rpm and bounce around 2 or 3 times then restore's back to 800 rpm, or C: goes back to 800 rpm fast with NO hesitation and stays there..
Its seems to be like the ECU is picking on which method it wants to do cause its never the same responce..!!
It will also do this while im in gear at high rpm then hitting the clutch to let it coast.
Meanwhile if im reved or in gear at low rpm's below 3000, and press in the clutch to coast, it drops to 800 rpm everytime and maintains there... its like clockwork..
So if the Z32 maf program is the same, then im not loosing anything, I might as well just get that one cause im already adjusted to tapping the gas pedal when the rpm's drop to about 1000 rpm anyway to keep it from doing A, B or C...
I rev up the motor to about 6500 rpm and release the throttle, then the needle will drop down to about 300 ish rpm where it will either A: stall out, B: go up to about 1000ish rpm and bounce around 2 or 3 times then restore's back to 800 rpm, or C: goes back to 800 rpm fast with NO hesitation and stays there..
Its seems to be like the ECU is picking on which method it wants to do cause its never the same responce..!!
It will also do this while im in gear at high rpm then hitting the clutch to let it coast.
Meanwhile if im reved or in gear at low rpm's below 3000, and press in the clutch to coast, it drops to 800 rpm everytime and maintains there... its like clockwork..
So if the Z32 maf program is the same, then im not loosing anything, I might as well just get that one cause im already adjusted to tapping the gas pedal when the rpm's drop to about 1000 rpm anyway to keep it from doing A, B or C...
go for the z32 program--JWT is notorious for taking forveer to get the ecu's back to you. The cobra maf will need a subtractor circuit or it maxes out at around 330 to the wheels. The 72 lb injectors are pointless without either a z maf or the sub circiut in the cobra mad. Id go with the z maf.
However--if downtime isnt all that abd for you--then go with the cobra--it supposed to have more detial in the maf reading signal sent to the ecu or something like that. The cobra and the z max out at the same HP rating when the sub circuit is used on the cobra maf.
Let me know how it turns out. IM trying to sell a cobra maf right now for 85 shipped if you want it.
However--if downtime isnt all that abd for you--then go with the cobra--it supposed to have more detial in the maf reading signal sent to the ecu or something like that. The cobra and the z max out at the same HP rating when the sub circuit is used on the cobra maf.
Let me know how it turns out. IM trying to sell a cobra maf right now for 85 shipped if you want it.
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rn240sx
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To Projex240
Its not the down time im worried about cause this 240 is my weekend driver. Its only driven on sat nights to the local meets and street races. My main concern is the driveability of the ecu. Everyone says the Cobra maf has more tunning time into it, which means smoother idle and smoother acceleration, etc. So if i did send my ecu back to jwt and wait the 4-6 weeks or whatever the "actual" wait time is, I can always slap in my 98 ecu and be able to drive the car, the only problem is, i wont be able to boost. At least this way I can crank the car up and move it in and out of the garage if need be..I'll decide eventually
Its not the down time im worried about cause this 240 is my weekend driver. Its only driven on sat nights to the local meets and street races. My main concern is the driveability of the ecu. Everyone says the Cobra maf has more tunning time into it, which means smoother idle and smoother acceleration, etc. So if i did send my ecu back to jwt and wait the 4-6 weeks or whatever the "actual" wait time is, I can always slap in my 98 ecu and be able to drive the car, the only problem is, i wont be able to boost. At least this way I can crank the car up and move it in and out of the garage if need be..I'll decide eventually