BigWhiteGTP

Went to Firebird last friday. Got a 14.8@94.6, with a 2.09 sixty on street tires. DA was 1725 at that time. Going back in 2 weeks with my drags hoping to cut a 1.8 or 1.9 and drop it down to a 14.4 or 14.5. Pretty stoked about it.

Thirdgen89GTA

iTrader: (5)

If you cut a 1.8' 60ft you are going to drop more than 3/10ths on the top end.

The average rule is 1/10th on the 60'f is worth about 3/10th at the end of the 1/4 mile. At least what I've read. I think its closer to 1/10th 60foot is worth about 2/10th at the end of a 1/4 mile. So if you drop from 2.09 to a 1.8, you should be closer 14.2 or so. If you are lucky lower.

An example. I was averaging 13.6 @ almost 103 with 2.0x 60 foots. I got it down to a 1.9x and my average time dropped to a 13.4 with a best of 13.3.

I did this on hard as a rock Kuhmo ASX street tires. Sadly I didn't have a set of radials to borrow, I could only foot-brake it to about 1200rpm, anything more and I'd just blow the tires away.

That was just with a better launch. With drag radials I would have been able to apply full throttle much sooner, as well as launched harder so the reductions would have been amplified at the end of the 1/4 mile.

I wish I had the log data from the runs. The data from the acceleration sensors as well as the actual sensor data from the TPS and VSS really show how a better launch helps the top end.

burnout88

A 1.8 sixty foot should be no problem. Could probably do it on the tires you have if you practice. Did you ever get that tranny shifting right?

Also, a little trick for you on TPI cars is to run the 1/4 mile with the car's heater set to high. It will be a little toasty in the cabin but the car will run faster. Give it a try

BigWhiteGTP

Hey Brian, I had the trans rebuilt around thanksgiving, but every now and then it still doesn't want to shift from 2-3 at wot. I too think I could do better with my tires, but my with drags, its guaranteed. Also, anything over idle, the tires would just spin and spin, so all my runs i do an idle launch. Seems to like it with the street tires.

I think 2/10s is more accurate. At least from what I've done at the track. 3/10s would be dreamy.

I'll post up what happens next week. This weekend is drag and drift, so Im hoping to see some out of control newbs wrecking their 240's.

BigWhiteGTP

Went back out to firebird tonight. Still no DR times, haven't found some spare 16"s. So I put just lowered the tire pressure to 23psi in hopes of a better 60ft. Bad Idea. 60fts all went up to the 2.2-2.3 range, whereas at 34psi what I run on the street, it was 2.0-2.1 sixties. I actually left the track real quick to put air back in the tires and came back and ran my best time of the night. 14.96@94.2 with a 2.17 60ft. One tire was still low, but whatever. I was just mad that my 3 hour cool down was wasted.

On that run I raced a 350Z with exhaust it ran a 14.5@95.6 to my 14.9@94, and looking at the whole slip, and how the race went finished, I was actually starting to catch him. Because our 1/8mile traps were 4mph apart, by the 1/4 it was almost 1mph. So that was the silver lining of the night I suppose.

And again all my runs were from an idle launch, five 14.9's and two 15.1s.

burnout88

Kev, my 305 car can run a 14.9 but at 88 to 89mph and I get a 1.7 to 1.9 60 foot time. Based on your mph you should be running a 14.3 or 14.4. Next time you are planning on heading out to Firebird give me a ring. I would not mind going with you to see what is going on. Run the rear tires at 29psi on the track and the front at 32 psi then put the heater temp control all the way to hot and blower motor to high. You should not be running the same time as me in the quarter. I have been in your car and I know it is faster then my peanut 305.

BigWhiteGTP

Actually Brian, Im going next friday night. I'll let you take a crack at it for sure.

burnout88

Alright sounds good. I will pm you my number I changed it not to long ago and I am not sure if you have the new one. I have not run my car at Firebird so I am curious what it will run at that track. Firebird is not know to be a very fast track but the dry cool air should produce good times. I have a portable air compressor so we can play around with you tire psi to get your launch down. You are losing at least two tenths in the launch.

Any one else want to join me and Kevin at Firebird Friday?

BigWhiteGTP

Cool!!!! Yeah, we definitely need more 3rd gen representation.

Thirdgen89GTA

iTrader: (5)

Just a question for you. Did you bother doing a short burn out?

The reason I say so is that on colder days it definitely does help to have a very short burn out.

I was going around the water box, and just staging, my 60 foots were about 2.1 on average.

As soon as I started doing a very short burn out on street tires my 60 foots dropped to the 1.9x range. I almost got a 1.8, was just shy with a 1.915. The tires on the car now are absolutely hard as a rock.

This is how short it was. http://www.youtube.com/watch?v=1c9j2Kg43c4

I'm also shocked that the 350z wasn't trapping near 100mph. Its not geared for a quick start, and the suspension isn't great for drag racing. But it should at least be able to trap 100mph or so.

BigWhiteGTP

I did a very short burn out on the last few runs, not even as long as your video and not through the water box either.

Very nice run, basically just a catback and headers and a cold air intake? Cone filter or what? what was the DA and temp? Also, what rpm was that launch at?

As for the Z, here in AZ traps aren't the greatest. Stock auto LS1s trap 98-100. Stick is 100-103. LT1 autos trap 94-96. Haven't seen to many stock 6spds around here, but my buddy ran his at the same track 10 years ago and did 14.3@95 too. LS2 GTO autos trap 103. So we were quite surprised I trapped almost 95mph here.

**Just read you have a swapped in LT1, first I read it as a swapped B-body LT1 CAM, your time makes some more sense now.**

Thirdgen89GTA

iTrader: (5)

They would be amazing if it was a B-body Lt1 cam in an L98 because thats smaller than the L98 cam.

But its basically an undercammed LT1. It'll go much faster once I put the aluminum heads on and either the hot-cam I already have, or a CC503. The springs I have are good to .650" lift. The bottom end is my only concern so I probably won't overcam it. CC503 sounds mighty tasty though. 340-360rwhp it seems for average.

The DA for the rental was about 1700ft

BigWhiteGTP

Yeah when I had my LT1, I was hell bent on throwing the GM847 in it. Well, then I spotted my GTA and sold the LT1.

My bro put an LE2.2 cam in his LT1 on stock heads. With 3.42s, performabuilt trans and 3K stall and LPP full exhaust, he's doing 12.7s at 107.

BigWhiteGTP

Best run tonight was a 14.8@92. It was a great night to run if you had new injectors, a working posi, DRs that weren't shot, and low compression on at least one cylinder because a plug was loose and had oil and gas all over the external part of the plug. I just discovered that 10 minutes ago, now my bad times are making sense. The injectors are most likely spraying in a stream pattern instead of conical, and with the IAT reading such cold temps, its telling the injectors to dump even more fuel so it's drowing, and with 7/8 compression, it makes sense to me now. I still have work to do.

It was cold tonight. Brian, my bro and I had some laughs and fun. It was a good time. We need to do a Pavillions night Brian. What do you say?

IROC212

iTrader: (1)

My Brother got a good video of you guys racing, both cars sounded really good! If you guys do the Pav's tonight, I may try to swing up there.

BigWhiteGTP

I wish I could go tonight Tim, maybe next saturday.

burnout88

That sure explains a lot!! My trans mount is destroyed and think the driveshaft also, U-joints look like crap. I think it actually broke on the first pass and after each launch shreded it even more and then took out the driveshaft. The entire trans was moving all over the place. I am actually lucky I made it home and did not drop the entire driveshaft at the track and pole vault the Camaro into the air.

I have ordered a new Poly mount and Inland Empire driveshaft. I think this may explain alot on why the my car just keep going slower.

burnout88

I just got online, did not see this. Let's maybe try for next Saturday at the pavillons if I have my new mount and driveshaft in. Tim, It would be awesome if you could share that video somehow. I have no photos or anything of my car at the track. I would really like to see it in action.

BigWhiteGTP

GOOD GAWD!!!! Brian, lets plan for next saturday night. I'll get work off hopefully. Just played BAD BINGO at Lone Butte, it was fun, some people have waaaaaay too much energy, Im thinking narcotics were in their system.

Started playing with the car today. I was told the 700r4 fits 7-8 quarts and I think i put in 9 or 10, not sure. Well found out it takes almost 12 so I added two more. The trans shifts soooooo much firmer and faster. I'll probably add another quart this week. I know the rear is leaking, so I got Mobil 1 posi rear oil and a new gasket. See if that helps out because I know its low. If that doesn't do it, 9-Bolt.com sells mini spools. Sucky part is, they have to mail it by boat since they are located in Austrailia.

burnout88

Yikes, low fluid is going to cause some issues. The 700R4 usually takes about 11.5 to 11.75 in fluid. Did you put a quart in the convertor before reinstalling?

Sometimes a fluid change will help bring the posi back to life. Give it a shot and let's hope it works. Also, someone may have serviced it with the wrong fluid (happens alot at the quick lube joints).

Thirdgen89GTA

iTrader: (5)

I'd say a fluid change won't help a 9bolt cone type LSD. The cones are probably worn and need to be shimmed.

Good luck finding a place that can do it. And good luck finding a place that can get parts for them. One of the only reason I went with a used 10bolt out of a LS1 vs trying to find someone to shim my 9bolt axle.

It worked in a straight line, but not on right hand corners.

IROC212

iTrader: (1)

Here's the video, its a mix of everything that night. You guys show up at 4:12

Oh and don't mind the commentary, everyone out there was a critic. I hear someone in the background calling my car a V6..

http://www.youtube.com/watch?v=urmBwGo19OI

BigWhiteGTP

Yeah your right, everyone is a critic.

As for my 9bolt, i know the fluid is really low. Im changing it today. I put in Royal purple last summer. Im sure it won't fully cure it's performance, but it will improve it at least.

I can get a full rebuild kit from 9Bolt.com for under $400 shipped. And by shipped, I mean they actually put it on a boat and ship it. Yeah, no heavy mail down under I 'spose.

burnout88

Thanks Tim, cool video. Damn shifter switchs were messed up all night. I had to start it with a screw driver half the time because the neutral safety switch was so screwed up, hence the reverse lights being on half the time.