Went to the dragstrip Friday (9/28/2018) - Saturn Sky Forums: Saturn Sky Forum
Autocross and Racing Discussion (SKY/Kappa) Tips, tricks, vehicle prep and setup, etc.

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post #1 of 16 (permalink) Old 09-30-2018, 09:28 PM Thread Starter
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Went to the dragstrip Friday (9/28/2018)

So I decided to take the sky to Cecil County md dragstrip Friday. I only got three runs in and I was chasing the right "tune" with the wot box. It was strange and I never thought I would say this but the traction was too good! I had the wot box set at 3000rpms for two runs and it fell on its face allowing only a 14.1 and 14.2. Third run I upped it to 4000rpms and got some spin which helped. It was also my best run at 13.68.

With more time I know I can get it way down but this is the first time Ive run a rear wheel drive and sky down a dragstrip. Here are the vids:

This was the best time
https://youtu.be/pvj__ZRU9Bw

Two 14 second runs:
https://youtu.be/3mYa-4b7xhU

https://youtu.be/YdobvDOeTE8
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Last edited by MattM; 09-30-2018 at 09:49 PM.
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post #2 of 16 (permalink) Old 10-01-2018, 12:41 PM Thread Starter
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I should also point out that this was with a trifecta budget tune. Like I said, I could easily have done better with more runs as I was getting the WOT Box tuned with regard to the launch and also the delay for the no lift shift.
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post #3 of 16 (permalink) Old 10-01-2018, 04:18 PM
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Was that a 3rd gen mudstain in the near lane in your 13 sec run? How'd he/she do? Just curious.
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post #4 of 16 (permalink) Old 10-01-2018, 05:31 PM Thread Starter
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Its a fox body. He ran a 13.068 at 111mph.

I wish I'd have had one more run though. I'd have set the 2step at 3700rpms (which I now think is perfect). I'm pretty sure I could have gotten a 1.9 60' at least.

The one thing I am let down by though is that I thought it would have more speed than that. It felt like at around 5300rpms in third the pull really let up, but once I shifted into 4th it pulled hard again. I'm thinking with the no lift shift and the fact that I'd still have 23psi after I shifted I could have shifted around 5600rpms from third into 4th to continue with the pull.
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post #5 of 16 (permalink) Old 10-01-2018, 06:03 PM
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Nice video I did notice that your trap speed was fastest in your first 14 sec run at 106 or 108 couldn't quite see it clearly. that tells me you did lose time off the launch but gained more speed later did you maybe shift earlier from 3rd to 4th?
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post #6 of 16 (permalink) Old 10-01-2018, 06:16 PM Thread Starter
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Here's the wierd thing about that. My slip from that run says I only ran 100.44 mph yet the light said 106. I'm thinking it was 100.44.
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post #7 of 16 (permalink) Old 10-02-2018, 11:51 AM
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MattM, on that first run you had no wheel spin? What were your 60's? What was the DA? I'd think that Fox Body spun pretty bad to run a 13.0 with a 111 trap. I'd think that would be closer to a mid 12.


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post #8 of 16 (permalink) Old 10-02-2018, 12:11 PM Thread Starter
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The run against the fox body I definitely spun. The high pitched squealing sound on the start is me spinning then I chirped 1st to 2nd then 2nd to 3rd. It definitely was me spinning. That was actually my last run of the night. The other two runs I had I didn't spin because I had the 2step set at 3000rpms. It just bogged on the line since it was at too low of an rpm. On the run against the fox body I got down to a 2.1 60'....on the other two runs I had a 2.3 and 2.4 60'. This is all on stock 11 year old goodyear eagle tires btw....

Having said all that...I'm confident I'll have the correct setting next time at 3700rpms. Track elevation is also only 325 feet.
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post #9 of 16 (permalink) Old 10-02-2018, 12:42 PM Thread Starter
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Just checked. At the time of my runs the temp as 64 with 88% humidity. According to a density altitude calculator it was around 787 feet.
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post #10 of 16 (permalink) Old 10-02-2018, 12:51 PM Thread Starter
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I'm also looking at other runs by gxps or redlines with trifecta's. I'm trying to figure out whether 102.4 or whatever is a typical speed or if it should be faster. I've seen some runs that are in the 107 range! I know every track is different but I'm trying to figure out if that let up of pull feel I had at the 5300rpm range in third is normal of if I have something slightly off somewhere...
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post #11 of 16 (permalink) Old 10-02-2018, 04:31 PM
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Quote:
Originally Posted by MattM View Post
I'm also looking at other runs by gxps or redlines with trifecta's. I'm trying to figure out whether 102.4 or whatever is a typical speed or if it should be faster. I've seen some runs that are in the 107 range! I know every track is different but I'm trying to figure out if that let up of pull feel I had at the 5300rpm range in third is normal of if I have something slightly off somewhere...
DA and temp are big factors.

Keep in mind many of the serious drag guys convert to E85 or have M1 Injection.
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post #12 of 16 (permalink) Old 10-03-2018, 11:41 AM
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Originally Posted by miller11386 View Post
DA and temp are big factors.
A lot of people don't get that. "Why did you spend all that money to just run 12s? I can do 13.3 where I live." Then you look up their track and it's DA is regularly -600 feet while mine's 5,500+... Then when you adjust your time or their time for altitude they tell you you're bench racing. LOL

Quote:
Keep in mind many of the serious drag guys convert to E85 or have M1 Injection.
Very true but the LNF's fuel system is limited in it's overhead to spray the additional volume of fuel E85 needs. Last I looked into it with the LNF (years ago) a lot of guys were doing a E45 blend and/or running additional port injectors to get the volume then letting the stock Direct Injectors handle the fine tuning of the mixture.

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I'm also looking at other runs by gxps or redlines with trifecta's. I'm trying to figure out whether 102.4 or whatever is a typical speed or if it should be faster. I've seen some runs that are in the 107 range! I know every track is different but I'm trying to figure out if that let up of pull feel I had at the 5300rpm range in third is normal of if I have something slightly off somewhere...
Your DA is pretty good...humidity probably killed you some, hence the higher than actual elevation...

I would guess your trap speed will go DOWN if you get a sub 2.0 launch the Grand Prixs (being FWD) considered a 2.0 launch on street tires really good and I hit a 1.997 60' on them ONCE (great track prep) so with those old Goodyears, I bet you may have a 1.8 in there with some decent tires. General rule of thumb is 0.2ths in the 1/4 for every 0.1 in the 60'. So that 13.6 could be a 13.0-1 with a good launch on sticky tires and nothing else. What were your pressures? Fronts should be as high as the tire allows and the rears definitely in the mid to high 20s.

As for your trap, keep in mind that the more you spin, the lower your et and the higher your trap...generally.


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post #13 of 16 (permalink) Old 10-03-2018, 03:36 PM
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Very true but the LNF's fuel system is limited in it's overhead to spray the additional volume of fuel E85 needs. Last I looked into it with the LNF (years ago) a lot of guys were doing a E45 blend and/or running additional port injectors to get the volume then letting the stock Direct Injectors handle the fine tuning of the mixture.
The fuel system is why I abandoned the Kappa platform. At the end of the day, there is no good way to get a decent fuel system on these cars to make it much past 400whp.

Now I have a drag car with a mechanical pump moving 6.8 Gallons of fuel per minute along with (12) 2150cc injectors on 6 cylinders. Should be enough to support 2500whp on Gas, 2000whp on E85 and 1800whp on M1.
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post #14 of 16 (permalink) Old 10-03-2018, 06:31 PM
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Originally Posted by miller11386 View Post
The fuel system is why I abandoned the Kappa platform. At the end of the day, there is no good way to get a decent fuel system on these cars to make it much past 400whp.
And hence one reason why I went with the 2.4. LOL Port injection made life easier. LOL I was already learning about turbos...


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post #15 of 16 (permalink) Old 10-04-2018, 08:22 AM Thread Starter
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All I'm looking to do is hit low 13s with the trifecta base tune then dip in the high 12s with the e47 after that I'm done. The e47 tune gives all the benefit of having ethanol without running the injectors to the ragged edge.
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