ITBs on a Z24i?

[Drift21_Hardslider]

Just curious if this has been done before? Found some ZX10 throttle bodies for a decent price and it got me thinking about trying it.

[seang]

The Z24i only has about 6psi fuel pressure stock. You might have to install a different fuel pump. I personally don't know about the vacum diagram setup, Brake booster, vacum advance. Needs a M.A.P. sensor for sure. It would sound really good, like webers. If your particular truck isn't a rust bucket like my 87 was.

[Drift21_Hardslider]

The Z24i only has about 6psi fuel pressure stock. You might have to install a different fuel pump. I personally don't know about the vacum diagram setup, Brake booster, vacum advance. Needs a M.A.P. sensor for sure. It would sound really good, like webers. If your particular truck isn't a rust bucket like my 87 was.

If the fuel pressure is that low, then I will. Had a larger fuel pump in mind already. Vacuum doesn't have me worried, I can get all of that to work and when I do this I'm going Megasquirt and dual Ford EDIS.

[seang]

Be careful not to run the dual plugs too hot. Under full throttle only one side works anyway. Maybe you should try dual colder ones, but honestly, its just a gut feeling. Don't colder plugs allow you to advance the timing more?

[Drift21_Hardslider]

Be careful not to run the dual plugs too hot. Under full throttle only one side works anyway. Maybe you should try dual colder ones, but honestly, its just a gut feeling. Don't colder plugs allow you to advance the timing more?

You know, the dual plugs have had me worried, too. I wonder if I shouldn't find a non-NAPS-Z head.

A colder plug can take more timing advance because of it's ability to dissipate heat. It also helps in high RPMs, high compression/cylinder pressures, and NO2 applications where heat will build up from running leaner. If I remember correctly, that is.

[seang]

I would try the dual plugs, but a bit colder, and with less advance at first, and then advance it a little bit more until you reach the sweet spot. I bet you will get good mileage that way. what have you got to lose, because a different head is a whole other story. And even if you do decide to get a different head, you can always transfer the itb bits to that one later on.

[Drift21_Hardslider]

I would try the dual plugs, but a bit colder, and with less advance at first, and then advance it a little bit more until you reach the sweet spot. I bet you will get good mileage that way. what have you got to lose, because a different head is a whole other story. And even if you do decide to get a different head, you can always transfer the itb bits to that one later on.

Why do you think my mileage will be better if I stick with the dual plug?

[seang]

I guess different combustion chamber technologies disprove the dual plug design, or at least simplify.

[Drift21_Hardslider]

I guess different combustion chamber technologies disprove the dual plug design, or at least simplify.

I just thought about this, doesn't my Throttle Body Injected Z24i have more than 6PSI of fuel pressure?

[seang]

I'm pretty sure it's between 6 and 9psi for the tbi version, much less than a port injection system. I realized this after buying a ZEX nitrous kit for my old 87 d21 with the z24i and 5 speed. The kit specified at least 36 psi to work right, so that project never came to be.

[Drift21_Hardslider]

I'm pretty sure it's between 6 and 9psi for the tbi version, much less than a port injection system. I realized this after buying a ZEX nitrous kit for my old 87 d21 with the z24i and 5 speed. The kit specified at least 36 psi to work right, so that project never came to be.

Huh, but then again TBI is somewhat like a carb, so it doesn't surprise me that much.

[nismopu]

huh? 6-9psi for a TBI? no way! Has to be at least 36psi or greater. 6-9psi is what my friends carbed z24 see's. Also, colder plugs prolly aren't neccesary at all, especially in a n/a engine where cylinder temps aren't qoing near high enough to justify this. If your set on this though you might wanna find out what the heat range on the plugs was for the z18et's, because they also ran the dual plug setup and boost. peace.

[seang]

I disagree, TBI systems aren't going to see more than 12 psi stock, 20 psi with an adjustable regulator. They are not the same as multi-port! See for yourself if you don't belive me.

[nismopu]

yeah, I just checked the clymers manual and it does show 14psi max for the tbi systems. I guess thats why the fuel pumps are so different. peace.

[Drift21_Hardslider]

yeah, I just checked the clymers manual and it does show 14psi max for the tbi systems. I guess thats why the fuel pumps are so different. peace.

Well, guess that just confirms I will need another fuel pump. One from a KA powered car should do fine, as I'm not really looking for a ton of power (170 would be nice, but I'm probably mostly dreaming).

[ca18datsun510]

my 87 puts out about 38psi, just hooked up the gauge quick and checked it.

[ca18datsun510]

page from the factory service manual, 36psi

http://dogwater.net/techref/1989fsm_ef&ec217.php

[Drift21_Hardslider]

Can I install a fuel pump from a KA powered car in to my pickup?