I went to the 1/8 mile track in San Diego this past Friday. I met up with Jose (maxima619) and Paul (sorry Paul, I forget your screen handle). I did a lot better than last time. My last thread can be seen here:
http://forums.maxima.org/showthread.php?t=414389
In summary, last time I had a 3.25" pulley (10PSI), LSS Y-Pipe, obvious weight reduction, and passenger corner light removed. My best time was 9.76 @ 75.75mph.

This time I had the same as above with the following new additions: 2.5" --> 3" intake piping, 3" --> 4" air filter, 25lb --> 14lb wheels and, of course, my new Jackson Racing Water to Air AfterCooler (only 8 to 8.5 PSI now with the AC).
http://s8.photobucket.com/albums/a6/...d/Aftercooler/

My first two runs sucked. I could not get traction. I litterally peeled out all through 1st, chirped 2nd, peeled out for another split second, caught and launched. 10.0 and 10.5 for my first two runs. I figured I better stop power-braking because this track has no traction. When I stopped power braking, I beat a Neon SR4 with 9.506s @ 78.25mph and an S2000 with 9.425 @ 78.81 mph

Best slip:
Reaction = 0.968
60 ft = 2.399
MPH = 78.81
ET = 9.425

I think the aftercooler really helps. This was the first time ever (between the track and my G-Tech) where my times actually went down each pass. I put in ice into my reservoir each run. I have two temp. probes, one at the blower outlet and one after the AfterCooler. After hot lapping, my blower side was about 100^ and my AC side was about 80^. After adding ice, my intake temps would drop to about 60-65^. Unfortuntely I forgot to read my temp. delta after run #1 (the only non-heat soaked run) but when I read my temp. deltas after the subsequent runs, my peak delta was always about 40^. My peak (full boost) SC side was ~150^ and my peak AC side was ~110^.

I did a lot better than last time and I don't think it is solely due to my 3" intake, larger filter and lighter wheels. Also, keep in mind, this is now at 8-8.5PSI of boost because I lost 1.5-2PSI through the cooler (2.87" pulley at home waiting for install ). Also keep in mind this is without power braking (power braking always gives me better times) and this is on an uphill track (not even a track, it is litterally a parking lot).

 

Have you ever had your car on a dyno?

 

damnnn ptatohed i was going to be at the track last friday in Qualcomm...
I wanted to see ur runs...r u goin to be there this friday?

nice runs though..good numbers

 

looks like you have about a 14 second run. seems like you could of done better if it wasnt for traction. i pulled one of my timeslips running just a 3.33 pulley @ 9lbs.
heres mine for comparison if you would of continued for the 1/4 mile
r/t .113
60' 2.206
1/8 8.602
mph 82.38
1/4 13.572
mph 103.94

 

Neal: Yes, my first dyno was at Stillen day last summer. Everything 100% stock except a 3.25" pulley. I got 142HP. A few months ago at Dyno Extreme's dyno day, I dynoed for a second time. New mods = 4" filter, 3" intake, lighter wheels and my Water/Air AfterCooler. Unfortunately, I had the worst of luck and my little cheesey Miata water pump failed on me the day of the dyno. So it was as if I dynoed without the aftercooler (but still with the 2PSI loss). Once again, I got low 240's at the wheels. I would have loved to know how much better I would have done with ice in the reservoir. I have sinced purchased and installed a Ford Lightening Bosch water pump. Not sure when I'll make it back to a dyno though.

gassian, sorry I missed you! No, I can't make the April 07 event. I'll try to make the May 05 event though. Are you going Friday? Racing?

maxboogie: You have some great times there! I wish I had a true 1/4 mile track near me. I think the rule is your 1/8 x 1.54. Therefore, I would have a 9.42 x 1.54 = 14.47. Not exactly where I would like to be but I'm working on it.

 

i am thinking about it...i already been there twice..and did not find any max's..
i might go ..i'm not sure

 

im really lost here. my car looks like this
60' 2.259
1/8 9.619 @ 74.08
1/4 14.916 @ 92.24

why was your car similar with a S/C (before the AC)? what were the conditions? Is it normally a slow track? I really dont understand?!

 

umm ya know..i ran on the same track...and i'm AT and my
1/8 10.45 @ 70.03

so i don't know..its a little hard to get a grip on that track

 

I hear you JS. And I was worried too. But I do believe (hope?) that this track sucks. It is litterally a make-shift, temporary track set up in a parking lot. And, like I said, it is uphill. I beat a 350Z, an SRT-4, an S2000, etc. And if you look at Motor Trend/Car& Driver, the 1/4 mile times are:
350 = 14.2 (granted, that's probably stick and I raced an auto)
SRT-4 = Motor Trend says 14.0, C&D says 14.3
S2000 = Motor Trend says 14.2, C&D says 14.0

If I remember correctly, the Z I raced got a 10.0 (1/8 mile), the SRT-4 got a 9.8 and the S2000 got a 9.6. So, if you multiply those by the magic 1.54 multiplier to get 1/4 times, those are high 14/low 15 second cars (which we know they are not).

So, anyway, it isn't just me.

 

Just knowing another cars 1/8 time and trying to compare that to mag times really tells you nothing. You need to see their whole slip.....most important you need to know what 60' they pulled. They could be pulling 2.4 60's and short shifint every gear....you really don't know.

 

Of course. And I don't always know their mods, if they are auto or stick and I'm sure the professional magazine drivers launch/shift better than the 19 year olds, etc. However, I wouldn't say it tells you nothing, but I would say it doesn't tell you everything. I was just trying to make a point that I believe everyone suffers a little on the Qualcom track in San Diego. Oh and I do have their whole slip. (Just not with me here at work).

 

Does the track where you run have a very high elevation? Or is it just that bad? Good job on bringing your times down.

 

I'm not arguing that your track may or may not suck, if you say it does I believe you. But with regards to magazine numbers vs what you are seeing guys run - magazine times are not done by professional drivers, they are done by journalists, they are done with 100-200lbs of test equipment, they are many times not done on real 1/4 mile tracks but rather done with glorified G-Tech meters. Magazine times are typically much SLOWER than can be seen in the real world, not faster.

 

why don't you mount the heat exchanger lower, like where an intercooler would go. Its really high and is not even centered by the grill or anything. Its not getting any air.

Also is there any way to run a different type of liquid or dry ice or something? Something that would be cooler than water, so you don't have to use some type of ice? I've been trying to search but havn't been able to come up with anything. Could you use the ac compressor to run the gas through the little barrel cooler? Or use another motor because the ac compressor stops at WOT right?

Or any gases that could be compressed and uncompressed, kept under pressure and could be used to keep the air temp very cold?

I guess its impossiable to make air cooler than the aimbient temp with water cooling?

 

stephenic, sorry for the delay, I was on vacation.

I could mount the heat exchanger lower. But I think it is fine where it is. I think it gets pleanty of air through the grill. Not sure why you think it is not getting any air at all. ? I have a Sorona grill waiting install with even more open area than the stock '97-'99 grill. I actually removed my grill on track night. All but the lower 20% gets direct airflow. I don't think I could do any better than my current 80% centering the heat exchanger in the lower bumper opening. Also, even though I have a '99, I have the big, huge, stock '95-'97 power steering cooler installed below. On the other side I will be placing a transmission cooler. I do plan on placing some 90 degree "chutes" in the lower opening directing air up and across the heat exchanger.

I thought about a different liquid or even dry ice. I haven't researched it yet. I'll let you know if I come across anything.

Yes, some people do use the AC compresser to chill the water. I can't do it with mine because it was not designed to work that way but they do make them. Here is a picture of a SHO using a refrigerated inter/after cooler:


Not sure what you mean by use another motor. I don't think our AC compressors shut off at WOT (do they?) but that would actually be a good thing. If you do install a refrigerated aftercooler, you would want to chill the air before/after your drag run, not during.

Your last question/statement about reducing intake temps to below ambient is correct - it is impossible. Actually, yes and no. You can reduce your intake temps to below ambient at idle with an Air/Water system and ice (not air to air). But what good is that? There is no way a water to air system (or air to air) can reduce your intake temps to below ambient at boost. When I boost, my intake temp gauge "flys". It is basically proportional to your speed! You'll never get your boost/WOT intake temps below (or even near) ambient but you can keep them at 100^F instead of 150^F.

Good questions.

 

When are you going again I think ill bring the monster out of hiding if another max is gonna be there and can run under 9.5 finally give me some comptition, last time I was out at the Q was a year ago and I ran 9.398 so maybe I can get pushed by another 4 door

 

Well, I missed the May events - but I'll go to the June 23rd for sure. You?
http://www.racelegal.com/site/event_info.htm

 

I may be able to do that, gotta see how bills pan out by then. But good possibility. Looking forward to it