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First track outing
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clay
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1972 Chevrolet Nova

PostPosted: Sat Nov 07, 2009 2:52 pm    Post subject: First track outing Reply with quote

Went last night to our local 1/8h mile track. First shakedown with the new turbo setup. Using the old butt dyno in the highway, I was hoping for 6.30's. Best time wound up being a 6.43 with a 1.43 60'. Not what I was hoping for, but all in all, considering nothing broke or acted really stupid, a great night. Things to work on, first is getting quicker spool for the launch. In the attached video, you'll see what I'm taking about. I mat it when I see the first bulb come down and when I turned the brake loose, it still hadn't gotten to the launch rpm chip which puts my reaction times in the 1.50 range. I'm going to try to pull timing when I'm on the brake to build some exhaust heat and the rest will be driver training Laughing . For some reason, they didn't have mph on the timeslips, but it seems to be running pretty good on the big end. Another quirk is the exhaust doesn't have a "clean" sound. Not like it's missing, but just a slight crackling sound. Another thing is it doesn't seem to want to buzz in the rpm's. Camshaft spec's probalby. I had leaned the carb up some and just for the heck of it since it was pretty cold, I jetted up a little and it didn't seem to make a difference. I'll have to think on that one. I did do better on the camera mount this time - you can actually see the track. Later, Clay
http://s20.photobucket.com/albums/b231/nuity5/?action=view&current=Turbo1.flv

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squeeezer
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PostPosted: Sat Nov 07, 2009 5:20 pm    Post subject: Reply with quote

do you run a p.v. in this set up

reason i ask is .......

you want to build heat to stage
how much timing will you pull to create combustion heat?????

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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Sat Nov 07, 2009 5:28 pm    Post subject: Reply with quote

I think you did pretty good for a first outing with a new setup. That's a low 10 second pass, maybe even high nines since turbo's usually pick up on the big end. How much boost were you running?
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Knarley Darley
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PostPosted: Sat Nov 07, 2009 6:17 pm    Post subject: Reply with quote

Not knowing what to look for it seemed like not much rpm on the line, and then you let the brake go and the thing seemed to launch and build rpm very quickly. I thought the pass looked really good. Wish they would have had your speed.
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jeep_406
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1972 Chevrolet Nova

PostPosted: Sat Nov 07, 2009 6:39 pm    Post subject: Reply with quote

Great for first time out. What's a good 60 foot time for you? Does your track run through the winter?

We are at different stages. I'm hoping to sneak into the 6's in the 1/8th and 10's in the 1/4.
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lun40119
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PostPosted: Sat Nov 07, 2009 6:58 pm    Post subject: Reply with quote

Nice run clay, on the two step harder while retarding timing would definately get you in boost earlier. Good luck fella.
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clay
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1972 Chevrolet Nova

PostPosted: Sat Nov 07, 2009 8:17 pm    Post subject: Reply with quote

Quote:
do you run a p.v. in this set up

Yes, I run p.v.'s in the primary and secondary. They are setup to be electrically actuated. The primary is set up on a microswitch that operated off of throttle postion, the secondary was setup on a pressure switch. The carb acts a little different with the turbo vs. the supercharger and I'm still doing little tweaks here and there.
Quote:
how much timing will you pull to create combustion heat?????

I'll probably start with 10* or so and go from there.
Quote:
How much boost were you running?

Around 10.5 to 11 lbs. This is with the wastgates backed all the way off. Figured I need some time with this setup before I start cranking in the boost.
Quote:
then you let the brake go and the thing seemed to launch and build rpm very quickly.

This is partly where the driver training comes in. I didn't wait quite long enough for it to get to the launch rpm limiter. I'm new to the whole transbrake thing and it's sort of different. Plus with the 10.5 tires, this is the first time it has even tried to hook while using it. I'll have to say, it feels faster in the 60' using a transbrake than footbrake even though the ticket says different.

Quote:
What's a good 60 foot time for you? Does your track run through the winter?

I ran in the 1.42 range with the Procharger with a best of 1.40. I'm gunning to get in the 1.30's and I think it'll happen it's just going to take a little tuning. The track in the video will pretty much run year round weather permitting. Others only shut down for a month or so around Christmas and start back up sometime in February.

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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Sat Nov 07, 2009 11:19 pm    Post subject: Reply with quote

thats pretty damn good for the first time out with the new combo Cheers . im jealous of the shut-down area at your track. i would get lost in all that space.
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jeep_406
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1972 Chevrolet Nova

PostPosted: Sat Nov 07, 2009 11:46 pm    Post subject: Reply with quote

I don't run a PV in the secondary figuring on launch the gas moves away from the PV causing a lean condition. I run jet extenders in the rear but I don't think there is anything for the PV.
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clay
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1972 Chevrolet Nova

PostPosted: Sat Nov 07, 2009 11:54 pm    Post subject: Reply with quote

Quote:
I don't think there is anything for the PV.

There is. I made a cap that serves two puposes. First it picks up off the very bottom of the bowl. Second I made it to accept a Holley main jet. This allows me to easily change the power valve channel restrictions which proves to be very beneficial on a blow through setup. Seems like I saw on Speedtalk that somebody has finally started making a cap, but without the tunable feature Wink . Clay

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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Sun Nov 08, 2009 2:16 am    Post subject: Reply with quote

clay wrote:
Quote:
I don't think there is anything for the PV.

There is. I made a cap that serves two puposes. First it picks up off the very bottom of the bowl. Second I made it to accept a Holley main jet. This allows me to easily change the power valve channel restrictions which proves to be very beneficial on a blow through setup. Seems like I saw on Speedtalk that somebody has finally started making a cap, but without the tunable feature Wink . Clay

i know you posted that info here somewhere. anybody remember where ?

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clay
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1972 Chevrolet Nova

PostPosted: Sun Nov 08, 2009 11:36 am    Post subject: Reply with quote

I never posted pictures specifically of the cap, I'll get it on here in a day or two. Clay
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Sun Nov 08, 2009 2:54 pm    Post subject: Reply with quote

im thinking it was amidst a blow-thru carb discussion where you posted pics of some of the mods you did to the carb. i want to find that thread if possible. ill keep digging. oh, youre right, it wasnt the cap it was some other cool stuff.
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clay
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1972 Chevrolet Nova

PostPosted: Sun Nov 08, 2009 7:14 pm    Post subject: Reply with quote

This is one of the threads.
http://www.smokemup.com/bb/viewtopic.php?t=3129

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af2
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PostPosted: Sun Nov 08, 2009 8:35 pm    Post subject: Reply with quote

Clay,
A turbo is slow compared to the Procharger.
You will have to spool them to get the #'s.

Boy do they pick up down the road!!
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