This is probably a dumb question, But is it okay if i take a stock motor and install an XF Throttle body? At the moment its got a cold air intake, extractors and 2.5" exhaust, ECU is standard and Cam is standard, I was going to do things in stages (because im poor), Throttle body first, Then the cam and chip, I was just wanting to make sure that if i put the XF Throttle body on now, then when i can afford it, get the cam and chip, that my car will run okay,

id imagine that it would.. its just gonna put more air into the motor, so it would be the same as having a CAI i suppose..

yes it is okay. however you have to sus out the TPS properly otherwise it will run shyt. Is your car auto or manual as this has an effect on how it will run with the xf.

My car is a Manual, uuuummmm.........whats a CAI?

cold air intake.

Yep do it. I've now done it in both a manual (my bros car) and an auto (mine) with noticable improvements in both. Car runs fine without a TPS in the manual if you can't be bothered but it is ESSENTIAL to set up the TPS correctly with the auto. I used the VL TPS and made up little brackets out of sheet gal steel. Do it all yourself and the XF TB has excellent "bang for buck" value in my opinion.

Sweet, already have the cold air intake :-), Im just going to follow what that other bloke did on here (one with the green VK - i think) who did the big write-up, For the TPS, swap the wires over on the VL plug to suit the XF throttle body, from memory it was remove the bottom wire on the VL plug and tape it up, then move the top wire on the plug down to where the bottom wire was in the plug (the one i just removed and tape up) then plug it in and away i go :-), Thanks for the advice guys,

Yup that's an awesome write up. Pretty much what I followed except where he says something about the red and green pipes going no where. They enter the throttle body just before the butterfly, I just U-shaped some vacuum hose and joined them. They're very small but you can see them if you look close. This kinda prompts me to do a write up because I did do a few things differently. hmm... EDIT: If you're lucky you'll find the version of the TB without these pipes, looks neater if you're that fussy

No mine had those little pipes - mine was from a ZK 1979 Ford Fairlaine, so an XE i think - maybe the later XF Ford didnt have these little Red and Green pipes, Installed it over the weekend, My process was slightly different - I took about 6mm of the face of the VL Plenum and welded a new piece of alluminium, made some new holes to suit the Ford throttle body and bolted it all together, However, i didnt get around to doing the TPS adjustment (got dark), also my throttle cable broke (the crappy little adjusting plastic bit!!!) so have to replace my throttle cable, I did kick the car over though - i dont know if this is what happens when you dont properly connect up the TPS switch, but it was like the throttle body was partially opened - idled quite high, I will fix it tonight, and let you guys know how i go,

Quote: Originally Posted by TRb30ett my throttle cable broke (the crappy little adjusting plastic bit!!!) so have to replace my throttle cable Yeah I did the same thing, it was really brittle. Quote: Originally Posted by TRb30ett when you dont properly connect up the TPS switch, but it was like the throttle body was partially opened - idled quite high Correct. I noticed this too. Also make sure you clsoe the throttle control on the actual throttle body. Its the screw at the top horizontal to the direction of the airflow. Just screw it all the way in (clockwise). If it's open you can hear the air hissing through it. Some original photos have not been recovered yet.

from some info i got, a stockablock motor will not need a XF TB, usually you will be running leaner. chip and cam it, and while the cars off the road get a port job done THEN bang the TB on.

Quote: Originally Posted by NA-jet from some info i got, a stockablock motor will not need a XF TB, usually you will be running leaner. I considered this and came to the assumption that the AFM will still register how much airflow is coming through, regardless of TB bore. I have an A/F Ratio gauge that always indicated further to the rich side which did not change on application of the XF TB.

well i guess it always changes to each persons ride. i know mine was WAYYYYY out, couldnt hold idle proply and leaned out hard core up in the rev range. so a aftermarket ECU fixed that lil pesky devil.

My idle is a touch crummy at the moment, I dont think the instructions for wiring up the TPS are correct, When i remove the plug, the idle speed increase's but is not choppy at all - i dont have a tacho at present but it sounds like its somewhere around 1500rpm, when i hook up the modified TPS plug the idle drops dramatically and is very choppy, i followed the write-ups instructions on how to connect the TPS, Spoke to a mate last night and he said the TPS works like this, 1 wire = Power, 1 wire = Idle signal to ECU, 1 wire = earth, This is the same for both the XF & VL TB's - there might just be in different orders, therefore all 3 wires need to be connected to get the TB running correctly, "Correct. I noticed this too. Also make sure you clsoe the throttle control on the actual throttle body. Its the screw at the top horizontal to the direction of the airflow. Just screw it all the way in (clockwise). If it's open you can hear the air hissing through it." Same mate also told me if you screw this particular screw all the way in you should actually stall the engine, as this screw is what determines Idle speed, by completely closing it of you slow idle speed untill it stalls the car??? I screwed it all the way in and it dropped the idle alot, but did not stall the engine - he said that because it didnt stall air is getting in somewhere eles,

Quote: Originally Posted by TRb30ett "Correct. I noticed this too. Also make sure you clsoe the throttle control on the actual throttle body. Its the screw at the top horizontal to the direction of the airflow. Just screw it all the way in (clockwise). If it's open you can hear the air hissing through it." Same mate also told me if you screw this particular screw all the way in you should actually stall the engine, as this screw is what determines Idle speed, by completely closing it of you slow idle speed untill it stalls the car??? I screwed it all the way in and it dropped the idle alot, but did not stall the engine - he said that because it didnt stall air is getting in somewhere eles, Can't help you with the TPS because I just used the VL one to save dramas. Your mate is correct in theory but only when the XF throttle body, is on an XF falcon. VL idle is not controlled at the throttle body. Have a look at your VL TB, notice there is no idle adjustment screws there. VL idle is controlled at the back of the plenum at the IAA unit. This is why I said to screw the XF TB screw all the way in, it is not required. Some original photos have not been recovered yet.

That is why i am getting a high idle probably when i dont connect up the TPS switch as you said, need to adjust the VL plenum idle screw, "Car runs fine without a TPS in the manual if you can't be bothered" At the moment it just idle's high, so many just adjust the Idle screw on the VL Plenum, This is obiviously why the engine dosent stall when I screw in the XF idle screw :-), I will have a play around tonight and let you know how i go, thanks for the help mate,

is anyones butterfly dirty? OR the spring on the TB is weak?

Everything seems to be sweet, idle is good, maybe a touch high, but smooth, so im happy, The AFM wasnt really secured properly, but now it is and i just played around with the Idle screws and the idle seems pretty good, I bought this cheap intake hose from Autobarn - i think i might invest in VN/VP air intake pipes

ive done the XF (ZK) and it runs really lean up top. i got a chiptorque chip n cam and it stil runs lean. Could it be lack of fuel pressure from the pump. they're a bit noisey????

Quote: Originally Posted by Creamin ive done the XF (ZK) and it runs really lean up top. i got a chiptorque chip n cam and it stil runs lean. Could it be lack of fuel pressure from the pump. they're a bit noisey???? have u changed the fuel mixture on the airflow meter as this will help when i got my cam installed it was running a bit lean and played with the screw on the airflow meter and got the car running nice. bump. Some original photos have not been recovered yet.