I think it is a good idea. I have stainless intercooler pipes and would put the sender on the elbow just as it enters the throttle body. Where did you see that unit? Will

 

i have a link to the site on top of the pic.

how involved were you stainless intercooler pipes?
any leakage? i don't see how they would seal all that well. do you use some sort of silicone or flange to make them air tight?

 

There are several unused access points on the intake where you can mount a sending unit. No need to mount on intake tubes. You will also get a more accurate reading measuring from after the trottlebody.

 

I like the set-up (you know me I like the EGT) that is a great visual aid they do kinda nickel and dime ya but well worth it. To keep it as bullit proof as possible I would use what they use there electrical pressure sender and install in the elbow just before the Throttle body like WYO996 suggested they could simply Tap a hole and use thread sealer to seal it. The EGT made me think that there are actually 2X probes needed one for each bank or if anyone can answer is there one bank that usually runs leaner, if so then you can monitor just the one bank. Also I'm guessing here but it does use 12V in for power right.

 

maybe i'm misunderstanding what you're saying, but don't you need to mount the boost sensor after the blower? having it on the intake side wouldn't tell you much, right? i agree with you having the boost sensor after the TB, but not sure where it would go. i was thinking somewhere between the IC and the TB.

 

Mother, not totally clear on your pic. are you saying tap that large bend coming out of the IC or somwhere off your diverter valve? What is your bend out of the IC made of? I don't have the the car here at the house now, so I don't know what the bend coming out of the IC is made of on mine. I know the IC unit itlself if metal.

 

When I said intake, I ment the manifold. Putting the sender ANYWHERE before the throttle body would not necessarily give you an accurate reading of boost to the engine. Throttlebody leakage? Intake tube leak?, etc.

IMO, there is no need for anything other than maybe a boost gauge, if for some reason you feel you need to know what the boost is at all times. Once you know the boost, it's not going to change unless you get a leak or belt slipage, and you will be able to feel those problems. Any inexpensive scanner will show you A/F ratio. If you were running some sort of a monster engine that was being tuned to the edge of it's limits I could see needing more information. The computer is pretuned for you on the safe side.

 

My IC connector pipes are made of steel note the picture on where to tap it is on the positive side of the pressure coming from the SC-IC-TB. If yours is not metal it still can be tapped remember where only pushing 6psi here. I'm not sure where 1999Porsche911 says there are unused places past the TB to tap into?

 

Gotcha. Makes sense now.
I know boost and air fuel will probably never change, but....
if one of the hoses develops a leak, even a tiny one, i want to know about it right away. i'm not looking to know exact boost, i just want it remain consistent so i can tell if a prob is developing. i ran into the leaky hose once already, and that was enough

With regards to the AF ratios, those will probably never change as well as the puter is pre programmed. However, in the car's current state of tune, if something should start to fail (bad injector, ecu, whatever), it would be nice to get some warning before i hammer it and blow the poor engine up.

i'll probably never need these gauges, but it couldn't hurt right? besides, with what i just dumped on this kit, a few more bucks either way isn't a big deal

so 1999, where would you tap it exactly? you have a pretty good knowledge of this kit. i'm not sure mother has the same hardware we do.

 

good pic mother. i just saw your post right after hit reply with my last one. i'm not sure we're running the same hardware and i believe all our IC pipes are plastic.

would it be safe to tap plastic to insert an aluminum fitting? with heat/cool cycles, i can just see that going bad fast.

 

Dog: You will not get an accurate reading of boost to the engine from ANY of the intake tubes or the IC. The throttlebody valve and bypass valve opening and closing will vary the reading too much. The only accurate method of measuring boost is after the throttebody. You want absolute pressure readings and there is none before the throttlebody.

 

I believe your BOV is on the underside of the elbow so you could tap a hole where in my picture my BOV is sticking out the side.

 

Yes, I agree you will never convice me that I don't need another "REMOTE". And since yours is a new system you would have the capability of logging the data. Maybe test at constant speed of 5000 RPM and save those numbers and every so often you can check again to see where you stand on leaks, clogging (dirty) IC etc.

 

You can plug into any vacuum port after the butterfly on the throttlebody, or remove one of the dummy plugs from the top of the manifold and screw your sensor in there. Another problem with screwing ANYTHING into the intake tubes is that you will lose air volume, which is the opposite of your goal. Simply putting a sensor that is 1/2 inch in diameter and threaded a 1/2 inch into your 3 inch tube will reduce the amount of air to the engine by about 3%. Putting the sensor before the throttlebody will not report any vacuum leaks either.


As far as what Mother has...it makes no diffence what system you use. You never measure vacuum or boost BEFORE the throttlebody. Mother is on the wrong track with this.

 

I agree I stand corrected, I just took a look at my engine and I am always willing to learn here, I really do not see any reason for not using a vaccum line coming from the engine manifold for reading the pressure and didn't really see any adverse effect if the reading came off the vaccum line going from the manifold to the BOV and it would make for an easy install. My engine is a 3.4 and did not see any dummbie plugs however.