Here is the old one and one that I made later. It is more conservative, but I think it is more accurate. Especially after what I saw today. The new one is called 520. Bill On Thu, 22 Apr 1999, Chris lang wrote: > I'd like to see the graph... > > Thanks, > > Chris > > ----- Original Message ----- > From: William Blount Arthur > To: dakota mailing list > Sent: Thursday, April 22, 1999 9:02 PM > Subject: DML: IAT sensor > > > > Well, I put a potentiometer on my IAT sensor and went out and played > > today. I will know more after I get my F/A ratio. I tried to send ya'll > > a graph that I came up with using my engineering skills (I'm a senior > > whoo hoo!) anyways I dont think it will take attatchments. What I found > > out is that at hotter manifold temps, you dont want to add too much > > resistance or it will be way too rich. I was dialing in 3 kOhms in > > addition to the 1.7 k Ohms that the sensor was reading at first today. It > > ran great at part throttle (o2 sensor was balancing it out) but felt a > > little down at WOT. It was still better then without anything. It was > > hot today and the manifold was at 160 deg. I know it was running rich > > because it dropped the manifold temp to 150 deg according to the sensor > > resistance. I dropped the potentiometer to only be adding 2 kOhms and it > > ran a little better at WOT. The manifold was still cooler, more like 155 > > deg. It makes the truck sound a lot different especially at 3000 rpm or > > so. I think this really is workig. Now, if anyone can tell me how much > > flow the truck took in stock and after exhaust TB ect I can really dial > > this in. I used 520 cfm to 550 cfm for my calculations. > > > > On another note, a 650 cfm TB will flow to 6240 rpm on a 360 and 7000 rpm > > on a 318. So, unless you are getting much bigger than that, I dont think > > you should spend too much on a huge sewer pipe TB. > > > > I put a potentiometer in series so it adds resistance to the sensors > > resistance making it appear colder than it is which makes up for extra > > flow at that throttle position that the computer cant know about. It is > > how the Hypertech PTM works apparently according to something I read. I > > am doing this with the Jet II installed still. > > > > Bill > > '97 SS/T > > -Ill mail you a graph if you are interested... > > > > > >