| Re: Air Flow Research (AFR) 195's VS Trick Flow Specialties (TFS) 195's - Test within |
Subject: Re: Air Flow Research (AFR) 195's VS Trick Flow Specialties (TFS) 195's - Test within by dan0617 on 2009/7/20 2:43:55 Quote:
I upped the static CR to help eliminate some cam surge I get around 45 to 48 mph in 3rd with the converter locked up. It worked, it is all but gone now. No matter what I did with timing/fueling/etc. in the tune it wouldn't go away. I ran at the track on motor only with your heads out of the box on this combo, which was a 10.7 SCR on my build. I ran a 12.22 @ 111 mph. That was on a 1.6 60' and 34 degrees of timing. I now ran after shaving the heads and going to colder spark plugs with a SCR of 11.4. I babied the launch since it was my first pass of the day. I ran a 12.32 @ 110.5, on a 1.7 60'. I'm sure if I launched the same it would have been a 12.20 or maybe high 12.1 @ 111 or so mph. This was with 28 degrees overall timing. Was also nearly 10 degrees hotter ambient temp the second time out. I really believe the higher compression and less timing is equal to or even a hair better than the lower compression and more timing, at least up to this point. 6 degrees less timing and only .1 slower in the 1/4 with a .1 slower 60' on that pass doesn't seem all that bad to me. BTW, my mph's might seem slow n/a but this setup is more optimized for nitrous. On that 200 shot my 1/4 mile was 10.66 @ 131.08 and that was on the pass that melted my plugs, will likely be quicker when the plugs aren't turning into lava. Also, I'm at 3520 lb raceweight. I really don't want to try racing fuel as this is a street weekend cruiser that I want to be able to run nearly as fast on the street as on the track. So far so good. I have found I need really cold spark plugs to run my 200 shot, which is likely more like 200 at the wheels. I just installed Autolite AR3931's. NGK plugs heat range 8 (similar heat range to the AR 3934) just melted the ground straps during my 10.66 1/4 mile pass so I know they are too hot. My worry is that the combustion chamber temps are too hot even for the coldest possible plugs. Is that possible at this point? I wouldn't think that a 200 shot rated at the wheels and 11.4 SCR, 9.2 DCR would be too much heat, I've seen guys running more on higher compression and they are surviving, so I think I just need the colder plugs. What do you think?? I'm also considering a small water/meth injection system to help lower the cylinder temps when spraying and to up the octane rating. That would be a longer term plan though, I'm really hoping that all I need is the colder plugs right now. The reason I pulled the heads and had a chance to shave them down was because I was stupid. I ran NGK heat range 5, or Champion RC12YC plugs, with a 175 shot. I melted them all, and melted the #7 cylinder exhaust valve and slightly damaged the seat. Local machine shop put in a new seat and valve and shaved the heads and put me back in business. As a side note Tony, I couldn't be happier with these heads. The AFR 195 elims were for sure the right head choice for my build. |
