Haltech Iat Vs. Oem Iat Rb26 ?

[GTSBoy]

7 minutes ago, Dose Pipe Sutututu said:

I prefer IATs post throttle body, however probably no real difference

It's a valid thought, given pressure drop over a partially closed throttle could & would cause a temperature drop. But I'm of the opinion that for a central inlet plenum like on single turb RBs, there's no ideal place that sees all the flow going past. Wherever you put the sensor it will only see the flow local to that spot. Unless of course you go FFP, in which case you can easily put in straight downstream of the throttle.

Does it matter? Maybe not. Probably not.

[ggub]

8 hours ago, GTSBoy said:

Well, it is trivial to drill a hole and tap a thread into the thick cast alloy of the cross pipe.

It's not as thick as you think. I drilled and tapped mine for the IAT that came with my Haltech PnP kit but ended up ditching it and getting Plazmaman plumbing with a dedicated bung welded on. The pitch on the M14 x 1.5 sensor left very little thread engagement.

[SeanR32GtSt]

I have no plans going with a FFP on my vehicle, hence why I was going to put the sensor on that pipe by the bov. 

[SeanR32GtSt]

16 hours ago, soviet_merlin said:

Do you have to, though? That sounds quite messy to me. Surely it would be easier to place it a bit further down. And drill into easily replaced piping instead. See the old replies above as well.

FWIW the Blitz intercooler kit on my RB25 has a nipple on the elbow of the pipe going into the plenum. No need for drilling. Looks vaguely like this:

My R34 that I’m doing this for, came with a blitz intercooler but I don’t see the exact pipes listed in your picture. 

[soviet_merlin]

8 hours ago, SeanR32GtSt said:

My R34 that I’m doing this for, came with a blitz intercooler but I don’t see the exact pipes listed in your picture. 

Going from your photo you may just have the Blitz intercooler core but not the piping. Maybe the previous owner didn't like the 2000s Autosalon chrome look. I certainly don't like it

This is what the Blitz plumbing looks like on the Stagea. The sensor sits pretty far from the plenum. No idea if it makes a difference. The piping itself is pretty tidy IMO as they route it through the factory sidemount intercooler holes in the engine bay.

[soviet_merlin]

15 hours ago, ggub said:

It's not as thick as you think. I drilled and tapped mine for the IAT that came with my Haltech PnP kit but ended up ditching it and getting Plazmaman plumbing with a dedicated bung welded on.

Where does Plazmaman place the bung for the IAT sensor? They supply the big hp kits so I would expect them to have given it some consideration.

[GTSBoy]

10 minutes ago, soviet_merlin said:

The sensor sits pretty far from the plenum. No idea if it makes a difference.

It's not going to differ from the T measured at the cast pipe by more than 0.5°C, under any conditions where it matters.

9 minutes ago, soviet_merlin said:

Where does Plazmaman place the bung for the IAT sensor?

Not sure, but it's either in the floor or the side, in the main body of the plenum.

[SeanR32GtSt]

I switched spark plugs, put new coil pack harness in from wiring specialties and was about to drill and tap the J pipe for my iat until I found out my tap kit didn’t include a M14X1.5 which is supposed to be the size of the sensor. So for now that’s the only thing I have left to do. Trip to hardware store tomorrow I guess. 

[ggub]

2 hours ago, soviet_merlin said:

Where does Plazmaman place the bung for the IAT sensor? They supply the big hp kits so I would expect them to have given it some consideration.

Wherever you ask them to. I had one added to the crossover pipe near the BOV as well as the hot and cold sides of the intercooler piping to provide greatest flexibility in measuring temperatures post-turbo. I have the IAT installed in one, and bungs in the other two.

 

[soviet_merlin]

3 hours ago, ggub said:

Wherever you ask them to. I had one added to the crossover pipe near the BOV as well as the hot and cold sides of the intercooler piping to provide greatest flexibility in measuring temperatures post-turbo. I have the IAT installed in one, and bungs in the other two.

Oooh, right. That makes so much more sense. For some reason I was picturing them selling a variety of pipe ends with nipples on them...

Solid reasoning.