When Well Enough Can't Be Left Alone; Backdate, EFI/ITB, AC, and more!

[chrisbalich]

Originally Posted by Showdown

I know you claim you don’t drink but this comment has me believing otherwise! Haha!

Dare to be different, Julian.
Everyone has Fuchs or BBS.
Some triple gold, knock-off Ds with Vogues or Royal Seals would tie in so nicely with your curb-feelers.

[Showdown]

What I WANT is a set of Group 4 aluminum steelies in black, or maybe gold.

The problem is that I have a set of Fuchs I just refinished in RSR treatment and brand new Dunlops.

Once I get the car more finished I’ll photoshop some options and see.

[shoooo32]

lol all I hear is "a little bit of gold and a pager" playing in the background hahahaha

Julian, two sets of wheels are required for Midwest living. Gotta have sensible all-seasons for spring and fall, then pull out the stickyickys for summer and autoX.

[jac1976]

lol all I hear is "a little bit of gold and a pager" playing in the background hahahaha

I’d love to know how many on here get the reference.

[Hulley]

Originally Posted by jac1976

I’d love to know how many on here get the reference.

Got it, stuck in my head now.

[Showdown]

Oh geez, I can’t get it out of my head now.

You all know that I’m going to buy new wheels right, that even though I may profess angst, I have no choice. I never had a choice… about any of it… it was all destined… I’m just along for the ride!

[Showdown]

MIDWEEK UPDATE!



...and we all know that means Julian hasn't been doing his real work job which is oh so bad. But Porsche work is oh so good, so I guess it's a wash... Just don't tell my clients. (actually, most of them make a b-line for the car when they visit)



After my little issue with getting a good vacuum signal I started reading a lot about EFI/ITB systems and the vacuum signals on which they're dependent. I'm still not sure if I'll use speed density or MAP but before I can evaluate which is best for my application I need to have a good signal.



Lots of the writing I came across was about the importance of isolating the vacuum signal from noise or pulsing. The best way to do this seems to be a central manifold and uniform travel distance from each TB to said manifold. Apparently hoses of different lengths can create a pattern of pulsing that can distort the signal.



I looked at EFI/ITB systems from lots of companies who charge lots of money for their product and almost universally I kept seeing a second vacuum rail near the fuel rails. Not a single one used hoses from the TBs to the manifold. Hmm.



When I plumbed my system I didn't know this so I just ran hoses from each TB to the manifold. Those were the instructions and I followed them to a T. Today, instead of taking a lunch break I decided to rectify that.



I started with some untapped fuel rail and cut it down to 12 inches. I drilled and tapped three 1/8" NPS holes.







After that I tapped each end of the fuel rail for an AN-8 plug.







Then before installing those plugs I drilled and tapped one per rail again for a 1/8" NPT fitting.







I now had two air tight manifolds; one for the left bank, one for the right.



Needing to fit them to the TBs I drilled and tapped more holes for an M6 bolt and fabricated a few aluminum brackets that would allow me to utilize the fuel rail mounting points on the RHD fuel rails.







I figured two per rail was fine but if I need another I can add it as the fuel rails have three mounting points.







Once the fabrication was complete all that was left to do was say a prayer and install them and hope that my measuring was accurate.







theres enough space for the injector wiring plugs to fit in between each rail and they don't interfere with any other function or access.







I did have to plug 4 of the 6 holes in my main manifold. I may fabricate a new one at some point but I had the plugs handy and this was the path of least resistance.







I still have to run the short hoses from the TB barbs to the vacuum rail barbs but that's a piece of cake- I did actually have to eat lunch otherwise I would have completed that part too.



So not only does it look a LOT cleaner without all those hoses running everywhere, said hoses are now out of the way of the linkages and can't get tangled up or interfere with any moving part, but the distance from each TB to the first manifold, is identical and the distance from each of those manifolds to the main manifold is also identical which should do as much as possible to eliminate pulsing and create as even of a vacuum signal as possible.



I'm calling it a win. Not bad for a mid week lunch break.

[rwest]

Julian,

What an awesome solution! Clean and helps with accuracy. I may just need to look into that as well.

Where did you source the fuel rail stock?

Thanks

[Showdown]

Fuel rail from Jegs. I bought a 36” piece just in case I messed one up but it comes in various lengths.

Evil Energy block off AN-8 plugs from Amazon

1/8” NPT x 1/4” barbs (both straight and 90 degree) from Amazon- but make sure to get NPT so they seal correctly. NPT have a taper and seal by thread locking- NPS don’t and require an o-ring to seal.

1/8-27 & M6 & 3/4-16 Taps from McMaster Carr (or Amazon) Taps will be NPS of course which is fine so long as you get NPT fittings

You can get NPS fittings with o-rings but they’re much more expensive than the brass NPT fittings which are chump change. Think $1 per fitting vs $11!

[chrisbalich]

Originally Posted by shoooo32

lol all I hear is "a little bit of gold and a pager" playing in the background hahahaha

Julian, two sets of wheels are required for Midwest living. Gotta have sensible all-seasons for spring and fall, then pull out the stickyickys for summer and autoX.

False.
Fulltime stickies.
#noragrets

Originally Posted by jac1976

I’d love to know how many on here get the reference.

Searching my car, looking for the product

[jac1976]

Originally Posted by chrisbalich

False.
Fulltime stickies.
#noragrets


Searching my car, looking for the product

I’ll just sing the rest in my head instead of typing it out…

Funny to think how squeaky clean those guys were in real-life relative to today’s gangster rap and hip-hop culture, yet they helped establish the genre.

[chrisbalich]

Originally Posted by jac1976

I’ll just sing the rest in my head instead of typing it out…

Funny to think how squeaky clean those guys were in real-life relative to today’s gangster rap and hip-hop culture, yet they helped establish the genre.

The real irony is that those dudes weren't terrible people, but were excellent rappers.
Now we've got terrible people who are terrible rappers.

[jac1976]

Originally Posted by chrisbalich

The real irony is that those dudes weren't terrible people, but were excellent rappers.
Now we've got terrible people who are terrible rappers.

Exactly. And Dr. Dre’s business success can’t be overlooked, either.

[al lkosmal]

Let me know if it improves your vacuum signal. Using the independent hoses was/is a common way to port the ITB vacuum to the vacuum manifold....PMO, Jenvey, ATPower, RHD etc....all use, or have used this method, and it works well. I have installed and tuned lots of PMO, RHD, Triumph Speed Triple mods using the vacuum hose configuration, but also have installed/tuned the Rasant kits, both with PMO ITBs with hoses and with the new Rasant units with rail vacuum designs. I haven't seen a difference in the vacuum signal, while tuning......but I haven't done a back-to-back test either. Nice way to tidy up the vacuum plumbing.

regards,
al

[Hulley]

Hey Julian,

Did you back date the heat or buy it that way? Also, will an A/C compressor fit with the backdated heater duct?

I understand you are going with electric A/C but curious if you had A/C before and just removed it.

[Showdown]

I backdated the heat and picked up the circled (and other side) ducts from a Pelican here. I’m not sure if the AC compressor will fit with the heat backdate.

My car came with factory AC but didn’t work so I deleted the mess; all 75 pounds of it!!

I’ve yet to be cold in my blast furnace of a 911 and when it gets truly frigid, the roads here are covered in salt and the death of a thousand hopes and dreams for a short, mild winter.

[Hulley]

Originally Posted by Showdown

I backdated the heat and picked up the circled (and other side) ducts from a Pelican here. I’m not sure if the AC compressor will fit with the heat backdate.

My car came with factory AC but didn’t work so I deleted the mess; all 75 pounds of it!!

I’ve yet to be cold in my blast furnace of a 911 and when it gets truly frigid, the roads here are covered in salt and the death of a thousand hopes and dreams for a short, mild winter.

Thanks, I have the factory A/C (York) and not even sure if it works, it's such an eye sore and want to remove it badly, but part of me thinks I'll regret it and want A/C. I've been told the factory A/C with York compressors are pretty much useless, plus this is not a car I'm going to be sitting in traffic in the middle of summer.

[chrisbalich]

Originally Posted by Hulley

Thanks, I have the factory A/C (York) and not even sure if it works, it's such an eye sore and want to remove it badly, but part of me thinks I'll regret it and want A/C. I've been told the factory A/C with York compressors are pretty much useless, plus this is not a car I'm going to be sitting in traffic in the middle of summer.

I have no AC in my car.
I still take it to work all summer. I find that rather than sitting in sweltering traffic, I will find alternate routes in/home. It makes the time in the car more of an event, even through typically mundane tasks like commuting.

food for thought

[Hulley]

Originally Posted by chrisbalich

I have no AC in my car.
I still take it to work all summer. I find that rather than sitting in sweltering traffic, I will find alternate routes in/home. It makes the time in the car more of an event, even through typically mundane tasks like commuting.

food for thought

Thanks Chris, I think I'll go ahead and remove it but leave the long lines in place in case I decide to install the Griffiths A/C kit. I work from home so I can really pick and chose when I want to take the car any where. BTW, I follow you on IG and love the Tundra!

[jjeffries]

Maybe you hardcore young bucks can live without A/C but this old fart finds it one of the very things that makes my 82 SC coupe such a versatile car in all seasons, including for its cabin air drying properties when driving in the rain and the obvious one of it keeping the cabin really pleasant on muggy summer days. I was fortunate in that the original owner of my car had spent on some Griffiths upgrades; a Sanden rotary compressor isn’t the eyesore that the old piston units were.

Best to all, John