I was at the JY today and finally got to see a throttle body from a GA16i engine and it looks exactly like the E16i TB. Can anyone confirm what the differences are, like the throttle plate sizes? Is there actually a difference?
Originally posted by gspot I was at the JY today and finally got to see a throttle body from a GA16i engine and it looks exactly like the E16i TB. Can anyone confirm what the differences are, like the throttle plate sizes? Is there actually a difference?
Or if you want to cut right to the chase, here's a reprint of one post from that thread, that answers most of your questions:
More Power for the E16i?
On one of the threads recently, someone was throwing some ideas around, and wondered if they could increase the power of an E16i, by using the throttle body injection from the GA16i. I didn't give it much thought, because they look basically the same, and I consider both to be pretty useless for high performance applications anyway. Then it ocurred to me tonight, that the GA16i makes 20 more hp than the E16i. I suspected that this couldn't be done, with the same size TBI. I have both of them here, and I removed them for a closer inspection. My hunch was right. The E16i has a smaller 38mm throttle valve. The GA16i has a much bigger 46mm throttle valve. Here's the good news: the bolt patterns are identicle. It'll bolt right on. You'll have to open up the small 38mm hole in the E16i's intake manifold of course. There are some definate differences however. The E16i uses an AAC [auxiliary air control] valve to control the idle speeds. The GA16i uses coolant to expand a wax packing, that pushes on some linkage to control cold fast idle. The size of the little coolant elbow hoses are different too. These things can be gotten around. The airmass meters, are physically the same, but not electronically. That's fine, just swap the original E16i airmass meter into the Ga's TBI. I have not personally done this swap [I don't think ANYONE has], but I think it can be done, if you've got the inspiration to do it. At least there may be some hope to make an E16i perform better on the cheap!
Thanks. I thought I had seen most of the TB threads before but I missed this one. I may have to try this swap soon. I took my 87 E16i Pulsar (Euro cam, fresh rebuild and 2.25" cat back exhaust) to the track and ran a disappointing 20.7 seconds, which was 1/2 a second slower than a stock Pulsar w/ some 17" Motegi rims.
I was at the local pick-a-part JY, appropriately called Crazy Rays, and there were no less than 4 Pulsars there, a 1st gen w/ the snowflake wheels, a dual cam car, an E16i car and a GA16i car. They still have a lot of good parts on them. I need to check out their other location which is bigger.
As a note : the injector must be swap also ... i remember the ga16i got a somekind of resistance before it that need to be putted on the e-16 harness to make the injector work good... but the e16 injector is bolt on to the ga16i TBI... very nice upgrade !!
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Crazy !
Sentra Sport Coupe 87 Turbo
14.850@97.454mph
H&R Spring, 15psi, TMIC, 370cc, Nismo mount and pulley, Almasi tuned ecu...
Nope, can't swap off the regulators; they're different sizes and do not bolt up to each others' throttle body by any means. The E16i regulator is about 3 times the size of the GA16i regulator.
As I said, the biggest snag about the swap is that damn FPR.
(The JB weld on mine's still drying.. I'm outta options!)
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you could try blocking it ... with somekind of screw.. let me explain ... you drill a hole on the top part next to the vacuum plug.. thread it, and put an allen screw in the hole to keep it shut.... hummmmmm that will raise the pressure ... maybe you can try to put one before the other ??... i guess you already tried that option ...
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Crazy !
Sentra Sport Coupe 87 Turbo
14.850@97.454mph
H&R Spring, 15psi, TMIC, 370cc, Nismo mount and pulley, Almasi tuned ecu...
The only way to mount the FPR off the E16 was to weld metal barbs onto it for the hoses to connect. My welding wasn't so good (first time..) so JB weld should be enough to take care of it until I find an aftermarket one that I can use.
You can't raise the pressure on the GA16 regulator-- It's the one that's too high. There'd have to be a way to lower it to use it.
I'll work on finding an easier way after I get this thing running smoothly.
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Originally posted by WhiteFox You can't raise the pressure on the GA16 regulator-- It's the one that's too high. There'd have to be a way to lower it to use it.
I'll work on finding an easier way after I get this thing running smoothly.
***** Hello Whitefox,
I got to give you a ton of credit for sticking out this dilemma. Many others would have given up by now. For those who haven't been following this thread and what Whitefox is doing, he's put a GA16i throttle body assy on an E16i. The biggest difference is the fuel pressure. The stock '88 E16i sedan engine uses 14 psi. The GA16i's fuel pressure is 36.3 psi. There is a difference in the amount of voltage the injectors receive also. Whitefox has gotten around that by swapping the GA injector back to the original E injector. Now all he seems to need to do is get the fuel pressure back down to 14 psi.........Wait a minute!!!!!! I think I've got it! There is an E16i tbi that used 36.3 psi of fuel pressure. The '88 4WD model does [not '87 though]. My shop manual is for the B12's so it doesn't have info on the Pulsars. It is also possible that the KN13 Pulsars [with E16i] might also be using the higher pressure of 36.3. Maybe someone here can look it up? It would be much easier to get a Pulsar injector than find an '88 4WD wagon.
Originally posted by fastpakr Could you eliminate the onboard regulator assembly and install an in-line FPR?
Whitefox has thought of that, but he can't find an adjustable EFI regulator that goes as low as 14 psi. I don't know if a racing carburetor regulator [like Holley maybe?] will go that high.
is the injector voltage higher on ga16 or the e16? if it is higher on the e16 then you could put a resistor in series w/ the ga16 injector and it should lower the voltage to the proper level for the ga16 injector and wouldn't have to worry about fuel pressure
Originally posted by minute rice sentra is the injector voltage higher on ga16 or the e16? if it is higher on the e16 then you could put a resistor in series w/ the ga16 injector and it should lower the voltage to the proper level for the ga16 injector and wouldn't have to worry about fuel pressure
If I can remember correctly, I suggested to Whitefox that he get the proper factory dropping resistor for it from the beginning. I don't think he ever did.
There is an E16i tbi that used 36.3 psi of fuel pressure. The '88 4WD model does [not '87 though]. My shop manual is for the B12's so it doesn't have info on the Pulsars. It is also possible that the KN13 Pulsars [with E16i] might also be using the higher pressure of 36.3. Maybe someone here can look it up? It would be much easier to get a Pulsar injector than find an '88 4WD wagon.
Linear Mode
