Hit the track last night with the 3.4 pulley and 2 more PSI
06-17-2006, 09:18 AM
#1
Hit the track last night with the 3.4 pulley and 2 more PSI And ran slower then the last time out with 13psi lol.
It was about 20 degrees warmer (same track) and the IATs were a good 20-25 degrees hotter at the end of the 1/8. But in the end the car with 15psi on a 80 degree evening (~3000 DA) as opposed to 13psi on a 60 degree evening (1900' DA) ran about 1/2mph slower. Sixty foots were not so great, 1.40 to 1.44, compared to 1.31 to 1.34 the last time and thats why the ET wasnt there.
So obviously the IAT is a factor, I actually had to lean the car out with the higher boost to get the same a/f as the last time out with less boost so if its not using the fuel its not making the power. I may be also just plain hitting the limits of my cam/exhaust also. Not to mention the blower spinning faster takes more power and makes more heat. With decent 60's I would have been in the 6.0x range again so I guess that isnt bad for the DA but I expected a little better with more boost. Maybe its time for a cam swap to see what happens.
Been kinda quiet lately, installed a cage in the car and what a PITA that was. Kind of wish I didnt do it but I was getting sick of getting thrown out of the local tracks with a 6pt..
few passes, car never really hooked well. Ran 6.42, 6.25, 6.153, 6.151, 6.150, 6.150, 6.141 so at least its a good bracket racer
http://video.ls1tech.com/video/69e24...02352e4d77.htm
It was about 20 degrees warmer (same track) and the IATs were a good 20-25 degrees hotter at the end of the 1/8. But in the end the car with 15psi on a 80 degree evening (~3000 DA) as opposed to 13psi on a 60 degree evening (1900' DA) ran about 1/2mph slower. Sixty foots were not so great, 1.40 to 1.44, compared to 1.31 to 1.34 the last time and thats why the ET wasnt there.
So obviously the IAT is a factor, I actually had to lean the car out with the higher boost to get the same a/f as the last time out with less boost so if its not using the fuel its not making the power. I may be also just plain hitting the limits of my cam/exhaust also. Not to mention the blower spinning faster takes more power and makes more heat. With decent 60's I would have been in the 6.0x range again so I guess that isnt bad for the DA but I expected a little better with more boost. Maybe its time for a cam swap to see what happens.
Been kinda quiet lately, installed a cage in the car and what a PITA that was. Kind of wish I didnt do it but I was getting sick of getting thrown out of the local tracks with a 6pt..
few passes, car never really hooked well. Ran 6.42, 6.25, 6.153, 6.151, 6.150, 6.150, 6.141 so at least its a good bracket racer
http://video.ls1tech.com/video/69e24...02352e4d77.htm
06-17-2006, 02:54 PM
#4
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25 degree delta at the 1/8 is a lot...Ive thought about Meth and just spraying the front of the IC manually to freeze it before the burnout.....you're running great in da heat though.
06-17-2006, 09:43 PM
#5
Originally Posted by onfire
25 degree delta at the 1/8 is a lot...Ive thought about Meth and just spraying the front of the IC manually to freeze it before the burnout.....you're running great in da heat though.
I dont think you want to spray straight methanol anywhere outside the engine, that stuff is pretty nasty..
06-17-2006, 09:49 PM
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Originally Posted by kp
Hot weather really takes its toll on this car, it was only mid-high 70s and the track is 1600' or so. Plus spinning the blower faster heated it up a lot quicker. I think I'll just put the 3.7 back on and be done with it, if it runs 9.90 in the summer thats good enough I guess..
I dont think you want to spray straight methanol anywhere outside the engine, that stuff is pretty nasty..
I dont think you want to spray straight methanol anywhere outside the engine, that stuff is pretty nasty..
I worded that wrong...I meant spraying Meth into the intake or manually spraying N20 onto the IC right before the burnout...would make a nice cold heatsink...I just worry a little about metal fatigue.
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06-17-2006, 10:50 PM
#8
Originally Posted by Got Me SOM
KP why not put the nitrous on and use a small shot just to cool the charge?
Car isnt running that bad really, a 6.14 with a 1.42 60' isnt all that bad at 3000' DA. When it cools off a little I'm sure I'll get it in the 5's..
06-18-2006, 12:40 AM
#9
KP what is the smallest pulley they make for the D-1SC charger? 3.7, 3.4, ??? i am going to try and pulley mine for around 20-24 psi , and have never dealt with FI, and am learning. i have been following a lot of your posts, learning things. if you get rid of the 3.4 and it will work for what i am trying to do, and is 8 rib, i might get it from you. let me know
David
David
06-18-2006, 08:49 AM
#10
Riechart will make any size pulley you want, but naturally you dont want to spin the blower too fast and the smaller the pulley the more chance for slip. Right now at 6800rpm I am at 59.5K impeller and 62K is tha max with a 7.25/3.4. A 3.2 would put it slightly over at 6800rpm.
I doubt you will get 20psi out of a D1 on an LS1, but with an F1x you probab;y could, but they have a higher internal step up ratio so you would run larger pulleys then a P1/D1. I'm going to spend a little more time with the 3.4 pulley on mine, track wasnt really hooking well so I'm going to give it another try next weekend at a lower elevation track.
I doubt you will get 20psi out of a D1 on an LS1, but with an F1x you probab;y could, but they have a higher internal step up ratio so you would run larger pulleys then a P1/D1. I'm going to spend a little more time with the 3.4 pulley on mine, track wasnt really hooking well so I'm going to give it another try next weekend at a lower elevation track.
