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Turbo Powered Snow Blower
 
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Location: Rocklin, CA .... Galveston, TX
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Quote:
Originally Posted by RarlyL8 View Post
I've bitten my tongue clean off on that one but it has cost me a lot of sales so maybe I'm the dummy. The pulse chamber is just one of many tricks you can use to change the exhaust tone but it won't do much for volume. I believe the Aborigines perfected this wonder of physics 40,000 years ago with the didgeridoo.
I had to look this thing up.

So it's a straight pipe with a mini muffler and a pulse resonator to control drone for $700.00. Nice.
Brian, correct me if I'm wrong, but every pulse resonator I have seen ends up somewhere between 24" and 28" to control the 129Hz drone frequency. That resonator is too short. Or is the flat 6 frequency that different?


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Old 10-23-2017, 07:35 AM
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Quote:
Originally Posted by flightlead404 View Post
Isn't the pulse chamber the same as the expansion chamber? Certainly an expansion chamber muffler was good for 1-2hp on a moped back in the 70's
Aren't they called Helmholtz resonators? There are calculators online where you can size them to tone down specific areas. I looked into adding them to my M5 to shut that damn thing up.
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Old 10-23-2017, 10:00 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #722 (permalink)
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Show & Tell, help me restore this neglected 930

^^^ I donít think thatís the same thing. Helmholtz is the Didgeridoo thing.


Sent from my iPhone while Driving
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Old 10-23-2017, 12:42 PM
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That comes with the license plate from so everyone will know why your car sounds awful.
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Old 10-23-2017, 01:12 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #724 (permalink)
Crotchety Old Bastard
 
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I know it's bad form to bash other manufacturers but damn, a $700 tailpipe? Again I'm the dummy 'cause they sold a bunch of these. We've got an active exhaust coming out this winter for the Carrera which should please those who like it quiet until the loud peddle sings. Also have one for the 930 which I am testing on the gray slant.






Back to our irregularly scheduled program ...
Pulled all the wires out of the POS pigtail fro the delay relay and plugged them into a modern relay. Power comes on with the key and she started right up! We're back in business baby!


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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 10-23-2017, 05:17 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #725 (permalink)
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Show & Tell, help me restore this neglected 930

Quote:
Originally Posted by RarlyL8 View Post
We've got an active exhaust coming out this winter for the Carrera which should please those who like it quiet until the loud peddle sing. Also have one for the 930 which I am testing on the gray slant.
]
Thatís why I have your headers and no muffler to install. I hope itís ready soon!


Sent from my iPhone while Driving
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Old 10-23-2017, 05:49 PM
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Crotchety Old Bastard
 
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Muffler is ready, tooling is the bottleneck. Had to outsource one part and as is typical if you don't control it you will be screwed. We are hopeful to have this resolved and to begin producing first of the year. I'm totally in love with the system, stock quiet at idle and cruise but man does she wail on the pipe! The valve is controlled by your right foot so if you want you can open it during spool-up and hear that turbo whiz as well. Love it!
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 10-23-2017, 06:36 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #727 (permalink)
Crotchety Old Bastard
 
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Latest update. Remember the brand new Chinese fuel pump relay that failed on me a few months back? Oh you guys are gonna love this.
Had to follow up on the ignition gremlins this car has had and the saga to get them all fixed.
The latest "fix" was to remove the delay relay up in post #725 and replace it with a modern non-timed relay. The engine fired right up after the transplant. We had tested that delay-relay and it failed to close the connection when activating the relay portion, so we knew it was flaky.
Well I put the IC back on and drove the car ~25 miles then back to the shop with no drama. Running really well with the added bonus of no run-on when you turn off the key (yes!). Feeling confident I decided to take it home where it belongs. Got about 1 mile away from the shop and poof! engine shuts off like I tuned off the key. Pulled over and cranked it, nothing. Good lord what now. Replaced the new relay and no fire. Another ride of shame back to the shop.
SO we start the search again.
Pulled a spark plug, no spark.
Hit the key to position 2 and the pumps fire. OK problem is still ignition.
Pull the fuel pump relays and hit the key and hear the CDI buzz. What?
OK maybe this is intermittent so plug in the fuel pump relays and hit the key, cranks no start. CDI still buzzing.
OK we have power to the CDI but had no spark. Check spark at the plug again, no spark.
Pulled the coil wire and checked spark, no spark.
Pulled the distributor and checked spark, we have a spark.
Are you freaking kidding me, the BRAND NEW coil that was replaced last month is dead? Grabbed a coil off a 911 engine we are rebuilding and plugged it into the system. SPARK.
Un-freaking believable. I replaced the OEM coil a couple months ago when I was going through this same scenario along with the green wire and cap/rotor. That was the SECOND coil that I had purchased from Bosch, the 1st one had a post snap off when screwing on the tiny 8mm nut. I gave the Bosch rep an earful. His response was less than comforting. He admitted what we all now know, that all parts come from Asia and are junk. Quality control is a thing of the past and parts are re-badged by everyone.
SO I went through my old parts bin and pulled out the OEM coil. Replaced the new Bosch unit with the old coil, put the intercooler back on and fired up the engine first hit.
This is a tragedy, not only for me personally but for every vintage car enthusiast and my clients as well. I'm going to do some searching and see where the good coils are, if they exist. I have to find some confidence level to drive this car, and it just can't be done with these garbage parts.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 11-26-2017, 07:31 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #728 (permalink)
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When I had a 911 turbo I learned that the currently available aluminum color Bosch coils that are made in Brazil will not last when they are mounted in the original location > upside down on the fan housing. I guess the vibration and heat cycles are too much for them and they eventually leak out oil and then they quit working with no warning.

The highest quality longest lasting new coil you can buy that has the correct impedance for the original Bosch CD ignition is the epoxy filled Permatune coil. They're painted black.

MSD coils are the wrong impedance and will eventually burn out the Bosch CDI box. I think the word impedance is referring to the total resistance of the primary wire coil in the ignition coil. Ignition coils are similar to a step up transformer.

The older black painted Bosch ignition coils that were original and made in Germany were the good ones. They are not available new anymore unless someone has new old stock ones.
Old 11-26-2017, 08:16 PM
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Brian, another good option for a Bosch CDI compatible coil is the one that p a r t s k l a s s i k makes, and an added benefit for some is that it looks just like the original Bosch coil (minus the "Bosch" branding). It's on their website (can't post a link or picture because the Pelican software blocks it). I have one and it's worked flawlessly for over a year so far.

Last edited by Rawknees'Turbo; 11-26-2017 at 09:11 PM..
Old 11-26-2017, 09:08 PM
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Crotchety Old Bastard
 
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Thanks for the tips guys! I use my cars as test beds for anything we do for clients. This coil issue is just one more hurdle that will help everyone keep these cars on the road. I've got a line on very good quality solid state relays as well that can be used for the fuel pumps and ignition. I'll post installation instructions on that when they arrive. I'm not giving up on making this car a daily driver, that was my goal when I bought it and it will be done.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 11-27-2017, 04:48 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #731 (permalink)
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Thanks for doing the research, Brian. You are doing God's work!
Old 11-27-2017, 08:07 AM
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Indeed - talk about taking one for the team!!! It's the same with Mercedes - Chinese parts just don't work out. I saw a Asian distributor cap that would not allow the car to start it was so bad.
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Old 11-27-2017, 08:33 AM
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Haven't updated this thread in quite a while. Unfortunately that's because I haven't done much of anything to or with the car in quite a while. Been real busy the last couple of years and time just slips by. Anywho I snuck out in the garage a couple evenings ago and performed the fuel pump fuse/relay exorcism that will get me back on the road feeling more confident in the car's reliability. Many thanks to Shadetree930 for posting a detailed write-up with pictures on how to do this mod. It's easy. If you can install an aftermarket volt meter gauge in your car you can do this. Here is the link:

930 Fuel Pump Fuse Overload - The Solution

My first thought was to leave all the wiring to relay #1 alone and just cut out #2 and re-wire that one to the battery. Then I took a close look at all that charred wire and fuse and decided to just liberate both of them from that bad design and old wiring.



Next up I plan to add more of the modern square relays. The one added to the rear for the delay relay has a conventional square base. Thanks to Flightlead404 we now have a source for round bases - thank you!
Here is that link:

Relay adapter - Porsche round hole to standard relay

One question I have for you guys who have been through this fuel pump relay mess. The new wiring for Pump#1 runs warm while the new wiring for Pump#2 is room temp. Why is #1 warm? It's not anywhere near hot, just warm, but I don't know what "normal" is for these.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 10-19-2019, 07:29 PM
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Are both pumps the same age?

Quote:
Originally Posted by RarlyL8 View Post

One question I have for you guys who have been through this fuel pump relay mess. The new wiring for Pump#1 runs warm while the new wiring for Pump#2 is room temp. Why is #1 warm? It's not anywhere near hot, just warm, but I don't know what "normal" is for these.
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Old 10-20-2019, 08:43 AM
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Maybe that's a clue. Both pumps were changed out a few years ago, the front pump is OEM style and the rear pump is a higher volume -044. I've heard there were quality issues with both of these pumps, just like all the other components that have been swapped out. Neither makes any unusual noises and flow and pressure are in spec. The engine runs really well and very strong for what it is. I'm wondering about grounding. Where physically do these relays ground? The wires disappear in the loom, can't see where they go.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 10-20-2019, 01:29 PM
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Quote:
Originally Posted by RarlyL8 View Post
Maybe that's a clue. Both pumps were changed out a few years ago, the front pump is OEM style and the rear pump is a higher volume -044. I've heard there were quality issues with both of these pumps, just like all the other components that have been swapped out. Neither makes any unusual noises and flow and pressure are in spec. The engine runs really well and very strong for what it is. I'm wondering about grounding. Where physically do these relays ground? The wires disappear in the loom, can't see where they go.
I have a complete wiring diagram around here somewhere if you get into a real jam... but I believe they are grounded through the safety relay and the overboost switch.
Old 10-20-2019, 01:42 PM
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Crotchety Old Bastard
 
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Appreciate that! I do have several wiring diagrams including those in the shop manual. All of the pump and relay specific diagrams just show the electrical ground hieroglyphic which is no help. I'm trying to find the physical wire and where it is physically grounded. I'd like to run a new separate ground and see if that helps. Before I go down that rabbit hole I need to install the new relay bases I received from Flightlead404. It seams very reasonable that the problem is in the old relay bases that have seen a lot of heat over the years. With the new pump wiring the relays are not getting hot like they used to but they are still warm. Again, I don't know how warm is normal and would like to hear from those who have done the wiring conversion and see what they have experienced.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 10-21-2019, 06:27 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #738 (permalink)
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Originally Posted by DSPTurtle View Post
I have a complete wiring diagram around here somewhere if you get into a real jam... but I believe they are grounded through the safety relay and the overboost switch.
Any chance you can post a copy 9f that wiring diagram?
Thx.

Old 10-21-2019, 06:41 AM
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