Author Topic: Twin Spark Cup & Enduro 156 Project  (Read 9697 times)

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Alfatango

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #90 on: September 09, 2021, 10:50:17 AM »
https://youtu.be/driylDWUBCI

1.8 ts with no muffler or straight pipe
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Colin Edwards

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #91 on: September 10, 2021, 02:34:45 PM »
Nice use of the rev limiter!!!

The original 156 Cats are probably 600<800 cells per square inch (CPSI).  Never seen inside an Alfa cat, however if they are ceramic cells and assuming say 600 CPSI, each individual cell will be around 0.65mm in diameter.  A metallic cat will likely support thinner cell walls so each cell may be say 0.75mm dia.  Pretty restrictive!  Given the role of the cat is to expose as much gas as possible to the catalyst, the cell section is rarely circular.  Result is a high wall surface area to cross section ratio - much like a radiator. 

Cats make pretty good mufflers, so replacing the stock Alfa cat/s with say 100 CPSI cat will probably not cause engine check light and support much improved gas flow while managing noise.  A metallic cell 100 CPSI cat will probably feature at least 2mm cells.

All tracks have noise limits that must not be exceeded.  Sandown is particularly stringent for good reason.  Not unusual to black flag at least one car at most Sandown sprints.  That 156 in the youtube clip would be sent home!

Present
2020 Giulietta Veloce
2018 Abarth 124 Spider
1987 75 3.0

Past
2015 Giulietta QV
2009 159 3.2 Ti Q4
2012 Giulietta TCT Veloce
2006 147 Ti 2 door Selespeed
1979 Alfasud Ti 1.5

Alfatango

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #92 on: September 11, 2021, 05:49:19 PM »
Nice use of the rev limiter!!!

The original 156 Cats are probably 600<800 cells per square inch (CPSI).  Never seen inside an Alfa cat, however if they are ceramic cells and assuming say 600 CPSI, each individual cell will be around 0.65mm in diameter.  A metallic cat will likely support thinner cell walls so each cell may be say 0.75mm dia.  Pretty restrictive!  Given the role of the cat is to expose as much gas as possible to the catalyst, the cell section is rarely circular.  Result is a high wall surface area to cross section ratio - much like a radiator. 

Cats make pretty good mufflers, so replacing the stock Alfa cat/s with say 100 CPSI cat will probably not cause engine check light and support much improved gas flow while managing noise.  A metallic cell 100 CPSI cat will probably feature at least 2mm cells.

All tracks have noise limits that must not be exceeded.  Sandown is particularly stringent for good reason.  Not unusual to black flag at least one car at most Sandown sprints.  That 156 in the youtube clip would be sent home!

Might just stick with the standard exhaust in that case as dont want to put in a new exhaust if I mess up the cats or sensors. Maybe do it down the track.

Can't get dry ice as in 5km lock down so went old school with a chisel and hammer. There are a couple of holes in the wheel well that were these square stickers and look kind of factory or could be rust repairs. Either way, if I was to buy a mig welder what type of metal would you use for patches? Can you weld with the fuel tank in the car?

 I may as well learn to weld as it could help with the seat brackets and a few other bits and pieces.
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Beatle

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #93 on: September 12, 2021, 09:42:28 AM »
Just put new tape back over the holes once you've cleaned up the wheel tub.
Paul B
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Past:
'79 GTV - Loyal 1st love
'76 GT - Track entry
'89 75TS - Saved
'76 Alfetta - Sacrificed
'83 GTV6 - NT bullet
'67 Duetto - Fun
'66 Super - Endearing
'92 164 - Stunning
'85 90 - Odd
'04 GT 3.2 Rosso/Tan - Glorious
'02 156 V6 Auto Rosso/Tan - Useful daily

bazzbazz

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #94 on: September 12, 2021, 01:41:54 PM »
Just put new tape back over the holes once you've cleaned up the wheel tub.

Hah, otherwise if you weld them up you'll find there's some secret super critical magical reason why the previous owner put them there.  ::)
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Alfatango

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #95 on: September 12, 2021, 02:18:58 PM »
Just put new tape back over the holes once you've cleaned up the wheel tub.

Hah, otherwise if you weld them up you'll find there's some secret super critical magical reason why the previous owner put them there.  ::)

Lol hopefully not. The previous towbar has left about 8 holes as well so wouldn't mind welding them instead of putting the bolts back on.

The steering wheel is super cool. Highly recommend and it has an nfc tag where you can check authenticity.
« Last Edit: September 12, 2021, 02:22:23 PM by Alfatango »
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Alfatango

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #96 on: September 12, 2021, 02:20:03 PM »
Rear door will stay with factory power window bracket bolted back in and cable ties because race car.
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Alfatango

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #97 on: September 12, 2021, 02:21:16 PM »
Front doors are getting door skins. This pvc you can cut with Scissors so it's pretty good.
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Alfatango

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #98 on: September 12, 2021, 02:35:24 PM »
The last AROCA Zoom Meeting had a great talk on a gta and got the idea to use conduit from Bunnings to cover up the wires that will be going through the car. As greatly engineered as the cloth tape going around the wires every 10 cm I think most alfa electrical problems are because of no protection on the electrical wires.
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bazzbazz

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #99 on: September 12, 2021, 04:05:35 PM »
As greatly engineered as the cloth tape going around the wires every 10 cm I think most alfa electrical problems are because of no protection on the electrical wires.

Ugh, the bloody Mummy Tape! Don't get me started . . . . .  ::)

As for the plastic conduit, use it in conjunction with Silicone Tape to bind it and keep any of the wires escaping from the split down the conduit. Also known as "Miracle Tape", "Rescue Tape" ect ect.

Brilliant stuff.
« Last Edit: September 12, 2021, 04:12:34 PM by bazzbazz »
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Alfatango

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #100 on: September 12, 2021, 04:34:16 PM »
As greatly engineered as the cloth tape going around the wires every 10 cm I think most alfa electrical problems are because of no protection on the electrical wires.

Ugh, the bloody Mummy Tape! Don't get me started . . . . .  ::)

As for the plastic conduit, use it in conjunction with Silicone Tape to bind it and keep any of the wires escaping from the split down the conduit. Also known as "Miracle Tape", "Rescue Tape" ect ect.

Brilliant stuff.

Thanks bazz. Will get some silicone tape as well.

Going to re do the dash into a mahogany color to give the car an early italian race car / ferrari vibe. Tried to a shoe leather spray and the colour is great but doesn't stick well nor is 1 can enough. Might just paint it with a brush.
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Alfatango

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #101 on: September 12, 2021, 04:35:05 PM »
Started as red seude, was meant to go brown but is now burgundy.
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Alfatango

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #102 on: September 12, 2021, 04:35:55 PM »
Tartan trim for the door skin
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Alfatango

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #103 on: September 12, 2021, 04:47:08 PM »
New decal
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bazzbazz

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Re: Twin Spark Cup & Enduro 156 Project
« Reply #104 on: September 12, 2021, 05:36:05 PM »
Yep, it's confirmed, you have WAAY too much free time on your hands!  :)
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