david rosario

wow this some great Reading I started this thread basically try to see if I could find this dual intake system as I'm going tru some mods on my S4 once again and I thought this would be a really nice mod, and this thread has gone wow!!! very nice reading but it seems like I may have to stay with the stock version, as these items see unavailable

dave Rosario

ROG100

The basic design is very easy and certainly not proprietary in any way. Happy for anyone to copy my design/product and as I said I would be happy to share the BOM and supplier list.
Anyone designing an intake system for the 928 87 to 95 would start by taking two tubes from the radiator down the side of the engine and curving inwards towards the MAF inlet. Adding filters can only be done on the sides due to space limitations.
Everything in my product is off the shelf readily available parts apart from the Y duct which I developed on my car at my expense.

ROG100

"How in the heck did "Jim" manage to get your later system EVEN HIGHER in the back. I can see scratch marks on the hood from it, I recognize those from my own mistakes, LOL"

Very easy to do - it is called trial installation - it was not Jim who designed the Y it was me. We started with a Corvette stock part and had the bends specially made. We cut different lengths until it fitted to the Spectre elbows.
The hard part was cutting the base of the Y low enough to not cause interference with the hood and still be able to add the special MAF fitting we developed (nothing like the clever piece you came up with).
All the parts are from Spectre apart from the Y duct and the Mercedes intake tubes.
https://www.spectreperformance.com/cat/air-filters

ROG100

https://rennlist.com/forums/928-foru...er-system.html

This makes great reading and it brings back memories of how Rennlisters got together to make great off the shelf products. I was trying to remember those that helped come up with a simple "none performance" cheaper intake system.
As DR says it is cheap and cheerful and nowhere near as sophisticated as his very Special State of the art specifically designed and tested "Blackbird". I did not have the time and money to design and develop a product over 18 months. Kudos to DR.

david rosario

wow that looks awesome, ty ty i just sent this to my mechanic, so he can work his magic for me, u guys are all great, i cant believe i own my s4 for 20 yrs + and just hooked up with this forum, i been missing out, i have two M's and been neglecting my s4 thats been sitting in my garage, i decided to give her the attention she needs

Jim M.

Well which is it Dave? Being a little hypocritical here aren't you. We would have happily bought your system, but it was NEVER available. If it was so good why didn't you produce it?

DR

Wow Jim, go back, slow down, and carefully read my 2 statements again a couple of times, let it sink in and maybe you will get it.

Where to start...sorry this reply took so long, been trying to figure out how to condense 11 years of hell into a few of paragraphs for you...and it's not so easy to do for me, but here you go.

Well Jim, what happened is I got sick, and sicker, and sicker, and on and on. My defective back (multiple Birth Defects) that has plagued me all my life, and has caused multiple damaged nerves (left me paralyzed on multiple occasions since my 20s), on top of the stupid abuse I put it thru all of my life, kept getting worse and worse. Then I lost the use of my left hand/arm (I'm LH'd) starting in 2006 until it was 100% unusable for most of 2007. I got back limited use by 2009 (still about 15-20 seconds is the longest I can stand turning a wrench to this day), then the right hand/arm started, then my TN Disease started intensely(Best TN Description I can find https://arizonapain.com/trigeminal-n...icide-disease/) my triggers were cold and stress., By 2008 I was now spending the winters as a hostage inside my home, basically comatose and bedridden up to 4 months at a time from the massive amounts of Neurontin/Gabapentin(3600mg a day) needed to survive the more and more frequent/intense TN attacks. (This winter pattern continued thru 2013 until we moved to Florida). All the while suffering from the effects of this and fully understanding why many Doctors have nicknamed TN as "The Suicide Disease".

Then in 2010 I had a small stroke that still causes issues to this day (and I have to monitor a venous angioma that is still bleeding in my brain). All during this time the other things were creeping in and becoming more and more prominent. Fibromyalgia began it's assault, Clinical Depression continued turning into PTSD, Panic/Anxiety Disorders etc. The nerve damage from my back continued making it harder and harder to get around, along with a few dozen other conditions including 2-3 (or more) autoimmune diseases(still hunting down some more today)

And my health just kept on giving, in the last 2.5 years I had a Major Heart Attack (STEMI, 95%/85% blocked) with 3 stints, 3 months later a stint in my renal artery, then next year another heart cath and another stint (5 total), then another heart cath, etc.

Then I find out I have 2 disks in my neck are pressing against my spinal cord at the base of my skull, with another one migrating that direction. One fall, one snap of the head, and well bye bye. For years I have been restricted from performance driving, taking my offshore race boats out to play, etc, etc. Luckily my NS is not knife happy...yet.

Hell Jim, Just In the last 3 1/2 months I have had 11 separate Back Procedures (4 RFA,burned nerves complete Lumbar/Cervical, 2 BB w/20 injections, 13 total Epidural Injections), and all of the sedation that comes with that (propofol + other goodies) , with another round of BB/RFAs coming (3 procedures) this month. I average over 1,000,000mgs of Prescription drugs a year, have all sorts of experimental treatments (2048 computer controlled electrodes piercing the skin for 30 min at a time is "interesting"), all just to be able to walk without assistance .... and in 6 months (if it lasts that long) I get to start all over again....over and over, probably for the rest of my life. Basically, I am the official "Pin Cushion" for the Florida Spine Institute.

So Jim, that is at least a glimpse of how I spent my Decade, I truly hope yours was much better. Sorry I couldn't make you guys a "Blackbird" back then. Hey, but at least I was able to make you and Roger the custom SharkVents you wanted during that time, trust me, it wasn't easy for me to do something even as simple as that. I just did the best I could for you guys and everyone else, no one is more sorry than me that I fell short, but it wasn't for lack of trying, or my intentions. Jim, you know me, or you used to, we spent 11 years talking on the phone with me helping you with your 928, you were even a guest in my home many times. You know darn well I have always been about happily helping others with their 928s and trying my best to come up with cool new products and ideas for everyone. Making stuff for people and helping them the best I could has been what my whole life is about, my history speaks for itself. Think Jim, why on earth would someone like me not supply anything, when doing so is what drives my life and makes me happy?? There is only one reason, because I couldn't, not wouldn't!

Now, to the business side of why I haven't made the Blackbird. The aluminum prototypes were never the actual product. Simply prototypes for proof of concept. The real product was going to be much, much more (and much, much less in price), and I was working that direction (at MY best pace). Final Mock-up was fab'd and shipped to manufacturer for 3D scanning and mold fabrication in March of 2010, and I was getting ready to make the investment($10 grand worth).... and then the EIS was announced literally a week later. In my mind the market was now "flooded", tainted, etc. and the numbers needed to make the investment work evaporated. So I hesitated on finalizing the production details, and money, for too long,...then I got even sicker(see above) and medical bills/prescriptions became the priority for any funds I had left from then on out.

So Jim, all of this is THE answer to.. ". If it was so good why didn't you produce it?"

Sincerely,
Dave

Jim M.

Sorry Dave, I had no idea! Of course health issues MUST take priority. We all wanted your blackbird, then when it wasn't coming (without knowledge of your health issues) Roger and I thought we could duplicate the design. Initially it worked well (yes there were rubbing problems) but it took off and Roger started getting orders. Again, none of us here in Texas had any knowledge of your health issues. If you remember, we (Roger) was banned from Sharks in the Mountains over several outright lies, so I had little to no involvement with you after that. As you can see from my avatar, I've moved on to a different model of Porsche. I'm still involved with the 928 group and still follow all of the developments. You were a real asset to the 928 community and we all wanted your products and followed your developments.

My apologies and please focus on your health issues!

DR

Not that it matters, but I told you guys a few times I was having some health issues, but I in all fairness I did not tell you all of it, nor the extent. Remember in 2008 or 2009, you were at my house and I mentioned some of what was going on, then you offered to come up for a week or so and help me out? In all fairness to you, I was also taking you for rides in my Twin Screwed 90GT that weekend, so I could have scrambled your brains a little that day!! :-)

Oh God, please not this too.. First off, there was no WE from my standpoint, you guys adopted that yourselves. Because of all the complaints I was getting and the stress it was putting on my worsening health, I asked Roger not to attend THAT Year, that I needed a break. I told him then I was having health issues and that was part of the reason. I hope Roger also relayed the fact to you that I was in tears by the end of the conversation with Roger because I was so as upset about dealing with it and my health issues.

So once again, let's please put this original "banned" thing that upset you so much to bed in Roger's own words....
Link:https://rennlist.com/forums/928-foru...ml#post7442693


That whole situation was a snowballing train wreck of the Nth degree, and it's over and done with, I hope. I hated it all, just thinking about it now isn't healthy for me at all.

You know Jim, I just wish you had judged me by your 1st hand knowledge of me and my actions, things would be different. Same with everyone else. You know darn well that as full as the 928 Forum is with great information and knowledge, it is also full of so many 2nd, 3rd, 4th hand BS stories about people it is nuts. Hell, let me give you an example of what happened just last week. A guy, who I have known for almost 30 years and consider a friend, started a crazy *** story about me that was total lunacy, and this was a story made by a friend about me. (Thread: https://rennlist.com/forums/928-foru...-opinions.html see post Page 1, Post #15) This place is full of crap like that.


Ouch, I hate that "were" part, but it is my reality. I do appreciate what you are saying, thanks, I know I tried like hell to be an asset for everyone here, and well **** happens. Some of the recent stuff they have done to me is finally making it more comfortable to type (and think clearly) at the moment, so I thought I would try to come back to where my home has been for so long. I was hoping I could at least come back here and be a little helpful in some way again, while I can....kind of all I have left in that respect.


Thank you Jim, I really do appreciate that.

Take care,

Dave

Kevin in Atlanta

DR,
I never mentioned you at all. It makes me sad when a single post in a single thread can put an end to a 33 year friendship. And yet it has.

Kevin

DR

Sure you did...

Who else could that be???

Geez Kevin,I never said or implied you did it with malice, I was just pointing out how these things start, even INNOCENTLY by a friend! Please read it again.

And if that's all it takes after all this time...it is certainly a sadder day.

Dave

Kevin in Atlanta

I don't like be sucked into a conversation that resembles Festivus when I have never copied or have stolen anything you have designed. And when I wanted to reproduce your metal intake covers in plastic I reached out to get your permission. Not like some on this list that shamelessly copy Greg's hard work and pass it off as their own.

We must have differing understanding of what it means to be a friend.

I'm done.

Kevin

DR

Kevin, seriously??? I didn't like getting sucked into your wild assertion of thinking you knew what happened to that tranny either, ...based on a conversation with someone else, all hearsay and you post it anyway.... Would a friend do that to a friend?? Should you do that to any one?

And yet,, even if that wasn't me you intended (recall you mention something about my history with the tranny on our phone call BEFORE you posted that comment), then you were still spreading untrue rumors about someone else, right, see my point? This is exactly what I was talking about.

I can't see how my mention of your thread in this thread makes any difference, your thread and all the comments I referenced are still there and it still active on Page 1,..with the same disparaging comments about me still there for all to see. Just gonna leave that there even though you know now it isn't true, would a "friend" do that??

FWIW, I removed your name from the post, and I do apologize for that. It happened during my reply to Jim and I didn't think, I was wrong.

Sorry ole pal,

Dave

Carl Fausett

We had a customers car in here with an "Enhanced Intake System" and was saddened to see how low the quality was. The explanation above that most of the parts come from Spectre (China) explains it. Spectre parts are cheap and poorly made.

In particular, the fitment between the pieces was horrible. See these pics I took down the tubes. Note the abrupt transitions from tube to filter and back again, and from tube to the Intake inlet elbow. This sharp ledges will not only impeded air flow, but worse, they cause the air to "trip" over those ledges as it flows, making the area available for air flow smaller. Those of you who have a handle on air flow and fluid dynamics will bear this out. This is only one of the reasons I did not like what I saw,

Another rose from the terrible fitment of the parts to each other. The filter was so loose within its housing that unfiltered air could easily get around it. I was unable to photograph the gap, but you can see the filter is off-center in its housing, and the air was passing by the filter element on the outside that was not sealed up.

Then there is the filter material itself: use of a oil-soaked cotton filter is dicey as it is, but when you accelerate the velocity so greatly by constricting it to such a small tube, the air-borne particulates are being shot at the filter media like from a gun. In DR's design, you will note the diameter of his filter housing is much larger, slowing the air velocity down so that the particulates can be captured just like the OEM air filter box does.. You can also see the filters DR uses have many more pleats, and hence, surface area.

Changing the air filter from pleated paper (commonly filters down to 1 micron) to oil soaked cotton (commonly filters down to 10 microns) has always been a quick way to pick up some HP if the owner knew what he was getting into: he was risking cylinder wall scratches for some HP. We do this all the time when racing - as our motor gets rebuilt so often anyway it doesn't matter much. But does the street-driven Porsche owner realize what they are risking? And that is just the difference in filter media - I am sure the 928 owners did not realize their EIS filter had so little surface area and so poor of construction and seal.

I hope DR continues to make his Blackbird kit with his high-quality filters. And I hope Roger takes this information in the right spirit and improves his kit before he sells too many more of them.

ROG100

Carl if you read the thread you would know that they have not been sold for over 6 years now.
Still have the system fitted to three of my own cars with zero issues and not heard back from customer regarding any other issues.
Yes you have to keep on top of the crud in the filters but that is normal maintenance.
Very happy with the setup - economical and looks great. No HP gains and we never sold it based on HP gains - just the bling factor.

I must get three emails a week asking for me to supply - you can check out the various threads. If DR made his system it would sell like hot cakes.
The system was designed by Rennlisters and we just made it available. Still looks pretty good to me on my daily driver.