q45 throttle body

[stanza34]

has any one hear put a q45 throttle on a ka24de because im putting one on mine and i don't know if the tps will work. the plug that comes out of the side will plug right to the ka but the q45 has another plug on the bottom of the tps and the ka doesn't. if any one has any info it would be helpfull.

[neverlift]

check the fsm's against each other..., I'd just see if the resistance changes in the same fashion ...

also are you going to bore out the intake manifold to get the gains, cause just putting it on isnt gonna do much, unless the manifold is bored to the q45 specs.

[eazye2000]

Also, the Q45 TPS has two connections. Like, they are both the same. Hook up either one, it will work. Something about having the same TB for multiple cars. I'm not 100% sure, but I'm almost positive that's what I read somewhere. Maybe that's for the RB motors. I dunno. But I don't think it will make much of a difference. Just check impedance/voltages.

[DeXteR]

I just picked up a Q45 TB and have not played with the tps at all. I'm assuming that I can just take the tps off the ka throttle body and stick it on the vh throttle body. If it'll fit, which, I'm assuming it will, I think that would be the best way to go.

Has any one tried this?

[stanza34]

they don't match up you need to use the q45 tps.

[spooled240]

maybe you can solder the wires to the q45 tps you know kinda like soldering the z32 mafs pigtail to the stock wiring harness? but i dunno if the ecu will work with the sensor, like how you can't use the z32 mafs with the stock ecu.

[480sx]

Putting a gigantic throttle body on a 4 banger is going to cost you drivability. Its not worth it at all IMO. You might see 5 hp or something at top end, but its not much of a gain.

[spooled240]

you know, i heard that the ka got a bigger tb one of the years anyway, i know my s14 came stock with this "bigger" tb..i think some of the s13 ka's may have had the smaller tb (sohc?) who have upgraded to the stock later model ka tb's..

but i agree with 480, unless the stock tb is super restrictive (which is not really) and the q45 will bolt up w/ out any modifications, how much power is this huge tb really worth? Just make the smaller tb cooperate by forced induction..

[Young_240_Guht]

so q45 TB not worth the hassle? Will the stock ECU handle it? What should i prepare for if im going with a calum sult?

[WDRacing]

No need to swap the TB out. The KA has made 450whp in numerous different cars with the stock intake and TB. Swapping a big TB onto the stock intake isn't going to improve flow any IMO. Now if you were to upgrade the intake mani...then I'd swap it out.

In short, unless you're power goals are huge then just keep the stock TB and intake.

WD

[spooled240]

installing the q45 TB and boring out the manifold to the q45 specs, how much is it going to improve? MAYBE some better throttle response and more hp capabilities in the 800 hp range. Dunno too much or heard experience with this mod

[crzycav86]

Don't get it. You will lose throttle resolution, and won't gain anything in the top end.

[SeanC]

Q45 TPS Specs:With throttle valve fully open, 4.4-4.6 volts. With throttle valve partially open, .4-.4.6 volts. With throttle valve fully closed, more than .4 volts.240sx TPS Specs:If the voltage is between 0.45 - 0.55 VDC at idle, the sensor is adjusted properly.OMG at with the throttle completely closed they are exactly the same! And guess what when you full open it the 240sx’s throttle body is going to be at 4.5 volts OMFG! There is so much crap information here I had to fix it all. The TPS voltages are exactly the same. Also you will not loose throttle resolution. We are not altering maps in the ecu here people. You will also not loose any power any where. Once you start adding more air via turbo, supercharger or even big cams you will want a bigger throttle body so you can take advantage of it. Remember the less restrictions the better ;-) just like exhaust (don’t get me started on the back pressure debate here)

[480sx]

How is a 2.75 inch throttle body a restriction to anything? Sure, i have a 3 inch cold pipe so i suppose it could be a minor restriction when looked at that way. However your runners are only but so big, with a stock intake manifold a bigger throttle body is simply not doing much at all.

A huge throttle body on a small displacement car is a PITA to tune for, and WILL decrease drivability. When you crack the throttle plate on a Q45 vs a stocker, you are letting in what.. 25-30 percent more air? Im sure the MAF can handle it, but whats the point? Your going to burn that much more gas and gain no seat HP.

Not really any crap info here dude, dont know what your referring to. No one is saying that there would be any problems with the Q45 TPS.

I did a small search and turned up nothing, what is the definition of throttle resolution?

[WDRacing]

Q45 TPS Specs:With throttle valve fully open, 4.4-4.6 volts. With throttle valve partially open, .4-.4.6 volts. With throttle valve fully closed, more than .4 volts.240sx TPS Specs:If the voltage is between 0.45 - 0.55 VDC at idle, the sensor is adjusted properly.OMG at with the throttle completely closed they are exactly the same! And guess what when you full open it the 240sx’s throttle body is going to be at 4.5 volts OMFG! There is so much crap information here I had to fix it all. The TPS voltages are exactly the same. Also you will not loose throttle resolution. We are not altering maps in the ecu here people. You will also not loose any power any where. Once you start adding more air via turbo, supercharger or even big cams you will want a bigger throttle body so you can take advantage of it. Remember the less restrictions the better ;-) just like exhaust (don’t get me started on the back pressure debate here)

If your goal was to come across like an arrogant jerk...well you nailed it.

[sumfoo1]

Q45 TPS Specs:With throttle valve fully open, 4.4-4.6 volts. With throttle valve partially open, .4-.4.6 volts. With throttle valve fully closed, more than .4 volts.240sx TPS Specs:If the voltage is between 0.45 - 0.55 VDC at idle, the sensor is adjusted properly.OMG at with the throttle completely closed they are exactly the same! And guess what when you full open it the 240sx’s throttle body is going to be at 4.5 volts OMFG! There is so much crap information here I had to fix it all. The TPS voltages are exactly the same. Also you will not loose throttle resolution. We are not altering maps in the ecu here people. You will also not loose any power any where. Once you start adding more air via turbo, supercharger or even big cams you will want a bigger throttle body so you can take advantage of it. Remember the less restrictions the better ;-) just like exhaust (don’t get me started on the back pressure debate here)

What there saying is you will loose a lot of partial throttle control especially on a boosted car.. a cracked q45 throttle body will probably flow as much as a 25-30% open ka throttle body but when you get to the upper end near WOT the throttle body is no longer the restricting factor... the stock intake manifold will be. I would say that with the q45 throttle body on the stock intake manifold from 70% throttle to WOT there will actually be little to no increase in airflow (making the pedal feel numb) unless you have a VERY powerful motor with head work and cams etc and the stock manifold flows better then i am thinking it does.