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track times.....can someone please explain

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Old 11-09-2001, 09:53 PM
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track times.....can someone please explain

After going to the track for my first time my best run was as follows.

Reaction: 1.992 (Wasnt quite ready)
60 ft: 2.217
300 ft: 6.075
1/8 ET: 9.308
1/8 MPH: 76.66
1/4 ET: 14.296
1/4 MPH: 98.86

Im really quite dissapointed with these results. My traction seemed horrible spinning like crazy.
I have a couple questions to ask, first off, they dont include your reaction time in your ET do they?

Also can anyone predict what i might be capable of if i get some tires that hook up?
Thanks


------------------
88 Camaro
350 w/vortec heads
Performer RPM intake (it does fit under the hood)
GM ZZ Roller Cam
650 Holley Vac. Secondaries.
700R4 w/vette servo, 2600 stall converter
3.70 9-bolt
Old 11-09-2001, 11:19 PM
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No, they don't count your reaction time. I would say with better traction you'll be easily into the 13's. Spinning waste a lot of time.

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Old 11-10-2001, 12:59 AM
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Car: 1987 Trans Am GTA
Engine: Miniram'd 383, 24X LS1 PCM
Transmission: TH700R4, 4200 stall
Axle/Gears: 9", 4.33:1
Get rid of those vacuum secondaries, get some sticky tires, and say hello to a low 13.

------------------
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355, TFS Heads, LT4 Hot Cam
My GTA

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Old 11-10-2001, 02:11 AM
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Farm kid....Times look good for your first run. I agree with the other guys low 13's are definately in your future. FYI I went to the track tonight and saw a few HEAVILY moded vettes and WS6's running in the mid 14's all night long. They didn't get good traction either. Good Luck in future passes!!!!


PS. a thirdgen camaro had the lowest time of the night. 7.42@157 mph with a 4.25 reaction time. Must be crazy to go that damn fast!


------------------
91 rs
3.42 gears,3" flowmasters,180 deg stat,custom prom,and a new 700r4 with shift kit and all the go fast goodies.
Old 11-10-2001, 05:44 AM
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Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
Your car is almost identical to mine.
only difference is 650 vac holley -750 vac holley ZZ4 hyd roller- 214/224 HYD cam
370 -4.10 These are really minor differences
My car ran a best of 13.44 @ 104.5 with
M/T ET streets. I think your car could meet or better this time. Tell me more about your
setup maybe i could suggest some minor changes to bring it up to your expectations.
(Carb jetting, Timing, Exhaust system, Fuel pump, lines , Fuel octane)

Although you just may have to break out the snow tires to get any bite, pretty soon....

[This message has been edited by F-BIRD'88 (edited November 10, 2001).]
Old 11-10-2001, 10:02 AM
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Upset with your results?????
Hell i ran a best et in my stock 88 LO3
of 16.8@81mph..........think i was madd
14s would be great for me......
Old 11-11-2001, 02:21 AM
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Engine: LS7
Transmission: 6 speed
Get it in tune. I assume you have a good exhuast/headers on there and not the stock cats. I agree with everyone else mid-low 13s ~104ish mph when you get it tuned just right. Give me those 3.70 gears and I could almost make that number. I do see you're frustation, but at least you know your time now so you don't have to guess anymore and there should be a lot more left to gain through tuning.

------------------
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Old 11-11-2001, 09:33 PM
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Thanks for all the input guys, its greatly appreciated. After doing all that work to it and spending the money, yes i was dissapointed with my times, however i guess it was my first time out.

From hearing other people's experiance and from some reading, i figure this setup should be capable of reaching times very close to 13 flat in the quater.

F-BIRD, I have been kind of lost of the aspect of getting it tuned and running correctly, so help would be greatly appreciated in this area. Heres some more detail on what i run...
the ZZ cam is 235/235 @.50 .480/.480 I/E lobe center is 114 degrees i believe and its a roller. Looking back this may not have been the best choice in cams for street use, but i think it will maximize my potential at the strip.

Unfortunately im not sure what jets are in the carb, i have this info at home, but im currently at school. What would you recommend?
Timing i have played around with alot, i think my distributer needed to be set-up quite badly. If i run the timing around 4 degrees advanced, its a dog off the line, but when i bump it up to around 14 it comes right to life. Detonation seems to be of no problem at this level. Im not sure what the best way to go about getting this setup is.

As for exhaust I have headman 1 5/8 shorty's with true 2 1/4" exhuast with just mufflers.
Fuel pump is stock, with a 3-port regulator. I run 91 or higher octane.

My tires seem to be just plain useless at the track, they're cheap cooper cobras 255/50's i think.

Also, does your tranny have the 3-4 upshift kit in it so that you can shift at WOT?

Thanks for your offer to help
Where abouts are you located?

Jon



------------------
88 Camaro
350 w/vortec heads
Performer RPM intake (it does fit under the hood)
GM ZZ Roller Cam
650 Holley Vac. Secondaries.
700R4 w/vette servo, 2600 stall converter
3.70 9-bolt
Old 11-11-2001, 09:34 PM
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oops

[This message has been edited by farm-kid/88camaro (edited November 11, 2001).]
Old 11-11-2001, 09:35 PM
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oops..triple post

[This message has been edited by farm-kid/88camaro (edited November 11, 2001).]
Old 11-11-2001, 10:28 PM
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Car: 1991 Camaro Z28
Engine: 350 TPI
Transmission: 700R4
I'm confused. I agree the engine might be a little out of tune, but based on his MPH and 60 foot, that's not half bad with street tires. At best you might be looking at a 1.8-2.0 60, that would only drop to a high 13. The 98 mph is saying around that e.t. as well. Am I missing something? The time for the car *At this moment* is what should be expected, but based on the mods, a much lower et and much mph should be in the near future.

------------------
91 Z28
Best Time Slip:
60' - 2.098
1/8 - 9.137 , MPH - 76.21
1/4 - 14.213, MPH - 97.55
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Old 11-12-2001, 12:03 AM
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Car: 1987 Trans Am GTA
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Transmission: TH700R4, 4200 stall
Axle/Gears: 9", 4.33:1
<font face="Verdana, Arial" size="2">Originally posted by Ions91Z28:
I'm confused. I agree the engine might be a little out of tune, but based on his MPH and 60 foot, that's not half bad with street tires.</font>
You're right. His time is very good for that mph and 60' time, almost too good. The reason why it all doesn't match up is becuase there are some 'issues' with his setup.

With the list of parts on his engine, it is not a little out of tune, it is a lot 'out of tune', and no where near it's potential. The cam is more than adequate to get him over 400 hp, the heads will flow enough to make atleast 400hp (even if they are out-of-the-box stock), the intake is plenty good, and the components listed for the exhaust system are also good to over 400hp...... But his results say, among other things, that he is not making anywhere near 400 hp. So what else could it be?? Answer: carb. First off, a vacuum secondary carb is just fine for mild street engines, but it is not a performance oriented part and should be ditched, especially with a cam of that size. I am assuming that the carb also has the stock 30cc accelerator pump on it, which is also a hinderence. And the smallish size of the carb is also a bottle neck, especially with a cam and intake (somewhat) that are more oriented to higher rpm power. A 650 is fine for a stock 350, but I think his wants more carb. But I gotta be honest; I am no expert on carbs. I don't run one on my car, but I have worked with them a little on some of my friends' cars. And from what I have seen, I would say that a 750 double pumper shouldn't be overkill, and will help that combo out immensely. Add a 50cc accelerator pump on the primaries, (usually requires a carb spacer of 1/4") and that engine should wake up nicely! The carb is really holding up the entire show, IMO.

And then of course, he needs some stickier tires (don't we all!).

So if you look at the tires as the major issue in limiting his 60' time, and the carb as the major component limiting his top end charge (really, it is holding up more than just the top end charge), it is fairly easy to see his car running low 13s - or better! - with the right carb for that engine and sticky tires.

my $.02

Good Luck Farm Kid!

------------------
1987 GTA L98 MD8
355, TFS Heads, LT4 Hot Cam
My GTA

The Minnesota F-body Club
Old 11-12-2001, 12:32 AM
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Thanks for your input matt, you've brought up some very good points. I'll have to look into the carb issue, maybe some other members have an opinion on this also.

Thanks again, and keep the great info coming!
Old 04-11-2005, 12:37 AM
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Like the others said it is a pretty good time for your first track outing with it. Now you'll know what to expect for next time.

As for the tuning issues. The carb on it should be adequate and will offer good performance, If you have/install a rear metering block and quick change secondary cover so you can tune the point when the secondaries open you'll be set. Perhaps upgrade to a larger squirter size if you ever run it on sticky tires.

I am assuming you are running a standard issue HEI distributor. If you haven't yet pick up a set of advance springs for it. I usually run one light spring and one medium spring and have my base timing set to around 16*.

Your biggest issue appears to be traction. Either get some sticky tires or just feather it off idle with street tires. You should be able to squeak out some 1.9 60' times on street tires with a setup like that and should run low 13's. I have a setup very similar to yours and with a 60' time under 1.9 it usually runs in the 12's.

Good luck!
Old 04-11-2005, 12:46 AM
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Originally posted by Rancid87
Like the others said it is a pretty good time for your first track outing with it. Now you'll know what to expect for next time.

As for the tuning issues. The carb on it should be adequate and will offer good performance, If you have/install a rear metering block and quick change secondary cover so you can tune the point when the secondaries open you'll be set. Perhaps upgrade to a larger squirter size if you ever run it on sticky tires.

I am assuming you are running a standard issue HEI distributor. If you haven't yet pick up a set of advance springs for it. I usually run one light spring and one medium spring and have my base timing set to around 16*.

Your biggest issue appears to be traction. Either get some sticky tires or just feather it off idle with street tires. You should be able to squeak out some 1.9 60' times on street tires with a setup like that and should run low 13's. I have a setup very similar to yours and with a 60' time under 1.9 it usually runs in the 12's.

Good luck!

Dude you just bumped a 4 year old thred
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