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-----Original Message----- From: Leon Martinez B. [mailto:martinezl@icanet.com.mx] Sent: Friday, April 20, 2001 10:54 AM To: bluesky@verdeonline.com Subject: RE: Muffler to go back on Sat. I am answring your questions by paragraph: --------------------------------------------------------- >From Chris::: ----------------------------------------------------------- >Hi Leon, > Going to put my stock muffler back on this weekend >to see once and for all if that is the main problem >with my car vibration. I look forward to trying your >pressure sensor as well, it shall give me some piece of >mind. I sent you my pressure sensor two days ago expect it today, Saturday or Monday. >I checked out that CO/O2 sensor/gauge, looks >like the ticket and not too expensive. Do you use >one yet? I was going to put it in my car but I placed it on my truck that is in my car hospital now (broken monster crank). I am waiting to get one from Autocraft from The Summit Racing catalog , it is cheaper and can use any one wire oxygen sensor one can scrounge up, this is cheaper also. THey are in the internet , I do not know their e-mail address. I will install one of these until I install a center console from Innovations in Fiberglass, need to buy it first. >I still like your idea of the adjustable >mixture from the "cockpit" - you really think you can >do it well, and when are YOU going to do it? Let me >know because I want you to set me up when you do. The adjustable mixture control idea is not from me it is an idea I saw in my EFI manual . This potentiometer is installed on some brains. This was a service installation from the fractory (dealer) the service part number is 311 906 019. Some cars like volvo have this on the brain just under the passenger seat , it is meant to improve mixture enrichment. Easy mixture ajusment inside car So I thought, why not install it on the dash. The more resistance to the brain via the head temp sensor the richer the mixture. Can be set lean too by placing small resistance on head temp wire to ground . I have not done this, I need my center conole first. When I do this I will place a 20 turn pot between the head temp sensor and brain the pot will be around 0 to 500 ohms. O ohms will be the standard and above that it will be richer. The Other pot I will place is beteen the head temp wire will be a 20 turn pot that will go up to 1 megohm (maybe 10 megohm), I hope i can find this. This will give me the posibility to adjust mixture a little leaner (I hope this works) , when my other adjustment is set to standard position. 1 to 10 megohm will be the aproximate standard factory setting. To do this, will be with the aid of the oxygen sensor. I had to adjust my pressure sensor when the car ran like crap from third world gas in Mexico and then different gas in the USA I do not know about you guys but gas is different between brands, states and countries. You can feel the difference in performance. Unless you always stay in the same city and use the same gas always. Our sensors were probably made and adjusted using the country of origen as the fuel standard. Oxigenation, alcohol etc... additions change alot of things especially desired mixture. No prototype made yet. >Can you recommend a temp gauge for my car - that too >will give me some piece of mind - you just never know? Very good thing for peace of mind ! I bought mine through an autoparts store that bought it from Bugpack that sells it. It is made from VDO. Many are on the net. Type in "head temp sensor vw " on your search engine and you find it . THe sensor for this is supposed to be placed under the sparkplug . If you do this you either have to machne the head or mangle the sensor or never take that plug out ever again. I placed mine at a front head bolt next to the top closest to the exaust at #3. Easy to put on and never mess with it . Your temps will show how really the hotest part is and not the cooler plug that is cooled by intake gas and warmed by combustion. This way The temp reflects the hotest part of the alumionum head. When you install your I han give you numbers (that is if you install it at the same spot as I . It is very worth it. >That washer idea for the head temp sensor - what kind >of washer do you use - and is it a steel washer for it >to run cooler? >I can't imagine that it would make much >difference when it is close to all that heat, I realize >the different conductivity between metals as to heat >but I would have thought the difference would be marginal >at best. I am using the aluminum one. (was too lean before) When you buy a new head temp sensor , you will get a thick aluminum washer in case your engine runs too lean with this. This will simulate the head slightly cooler. You can use copper, steel, stainless, aluminum brass... all transfer heat differently. I thought it did not make a difference but it works, the factory does this . >But hey what do I know, I'm just a Graphic >Designer/Art Director. Also - what type of plugs do you >use, and what gap - I have a petronix ignition and a >Hot Coil - what do you recommend? I use Petronix and a hot coil too and have not seen any problems since a year ago when I had to adjust and replace points. I drive way too much and had to mess with the points often. The standard Bosch coil is great but if you do not wish to mess with plugs and gaps and all that, a hot or monster coil will compensate for this as the plug gap wears open . more voltage will be sent to jump the gap in fact big coils require a sighter bigger gap to make a positive effect on performance and mileage. don't get too huge or you will crossfire your stock system . If you go really big you need special wires and dist cap I have had an experimental very lean detroit monster and cut off the plug electrodes from the plugs and set up to prevent crossfire. 70,000 volt, high current dual timed ,dual coiled system gave me better gas mileage than my old Ford Escort on the highway . You could see the wires glow with a corona at night . Melted my see through cap though . I am getting off the subject showing this experience off. The plugs I use right now are the regular bosch super but I use plugs from Torque Master. very werd plug tip though. THe design seemed far superior than anything I have seen before I replaced them after 40,000 miles last month. The quality sucks though , you will strip you head threads if you do not fix the threads on all of your plugs, These are made in chatsworth California. The otherone I will experiment with will be some stainless steel ones from Mexico city. the quality seems much higher and has the same tip as the Torque Master. If you are not into experimenting but just quality you can use the platinum plugs >From Bosch, You cant go wrong with this. This is the type I used in most of my cars even the werd setups. >Thought I would drop you a line this AM and say >Hi, let me know when you get a chance to get the >P. Sensor in the mail so I can look for it. >Have a great weekend. Do you have my number ? 1 am at home all day today. I will be changing my synth oil and oil filter. Havent changed it in 10,000 miles or three month of driving I know I am very bad. Also today and this weekend I will be placing an experimental "power valve" setup that really dumps in gas when pedal is floored . More zooom! My stock (except coil and Petronix) system can go from 0 to 60 in around 10 seconds) Bad boy again, I have always shifted all my autotrannies like a stick, except not from nuetral to go, you can break it, mine work beatiful still. I will let you know what happens with this major mod. I have just finished my cad drawing on this experiment. LEON MARTINEZ 1969 SQUAREBACK EFI/AUTO SAN DIEGO AND TIJUANA