Something doesn't seem right w/ my times.
Thread Starter
Burning Brakes
Joined: Dec 2003
Posts: 1,074
Likes: 0
From: Dallas (Go Cowboys!!!) :) Tx
Something doesn't seem right w/ my times.
First off, I'm dynoing right about 400+/380+. Now my problem is that prior to getting Drag Radials I was trapping 114-115 (run craps), now after I'm trapping 111-112s. Is that normal? Here an example of my time change:
Stock Run Flats (18 x 9.5 y2k rim)
12.47 @ 114 mph / 12.37 @ 114.45 mph
2.195 60 ft / 2.1 60ft
feathering it, then going WOT w/ TC
With Nitto 555Rs 305/35/18 (18 x 10.5 y2k rim)
12.17 @ 111 mph / 12.212 @ 112mph
1.82 60 ft / 1.87 60 ft
2000 rpm launch / 1500 rpm launch
I'm just curious as to why I drop almost .4 on my 60 ft, yet my time only dropped by .3? Any suggestion? Also do those times sound close to what I should be running. Not sure if this helps, but I'm running stock 3.15s w/ a 3200 stall.
Stock Run Flats (18 x 9.5 y2k rim)
12.47 @ 114 mph / 12.37 @ 114.45 mph
2.195 60 ft / 2.1 60ft
feathering it, then going WOT w/ TC
With Nitto 555Rs 305/35/18 (18 x 10.5 y2k rim)
12.17 @ 111 mph / 12.212 @ 112mph
1.82 60 ft / 1.87 60 ft
2000 rpm launch / 1500 rpm launch
I'm just curious as to why I drop almost .4 on my 60 ft, yet my time only dropped by .3? Any suggestion? Also do those times sound close to what I should be running. Not sure if this helps, but I'm running stock 3.15s w/ a 3200 stall.
Last edited by Tru_Ice; Aug 6, 2005 at 12:16 PM.
Thread Starter
Burning Brakes
Joined: Dec 2003
Posts: 1,074
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From: Dallas (Go Cowboys!!!) :) Tx
Originally Posted by JetVette01
you got traction. Spinning will yeild high trap speeds.
Thread Starter
Burning Brakes
Joined: Dec 2003
Posts: 1,074
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From: Dallas (Go Cowboys!!!) :) Tx
Originally Posted by inoyourtrippn
what was your R/T on those runs? your getting a good 60' time i cant wait to get my slicks so i can get my 60' time down.
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Thread Starter
Burning Brakes
Joined: Dec 2003
Posts: 1,074
Likes: 0
From: Dallas (Go Cowboys!!!) :) Tx
Originally Posted by inoyourtrippn
no prob we all have the same thing in common the luv for are cars and the passion to make them go faster 
Le Mans Master
Joined: Sep 2004
Posts: 7,027
Likes: 6
From: Shiloh Ohio
When I switched from OEM thin spokes to aftermarket 18 x 10.5 think spokes I lost a tenth and one to two mph, because of the increased weight of the wheels. Not sure if this helps, your times have me stumped to be honest.
Thread Starter
Burning Brakes
Joined: Dec 2003
Posts: 1,074
Likes: 0
From: Dallas (Go Cowboys!!!) :) Tx
Originally Posted by shurite44
When I switched from OEM thin spokes to aftermarket 18 x 10.5 think spokes I lost a tenth and one to two mph, because of the increased weight of the wheels. Not sure if this helps, your times have me stumped to be honest.
Le Mans Master
Joined: Sep 2004
Posts: 7,027
Likes: 6
From: Shiloh Ohio
Originally Posted by Tru_Ice
They seem to be stumping quite a few people, only 9 post (half by me) and 70 views. I need some insight.
Burning Brakes
Joined: Mar 2002
Posts: 1,176
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From: highland village texas
what I found for my car on DR was that a little spin on launch acutally help my overall 1/8th and 1/4 ET and MPH....seems if a little spin then the front end stays up and no loss of momentum during launch????
Safety Car
Joined: Apr 2003
Posts: 4,251
Likes: 7
From: Woodbridge Ontario
Few things that come to mind.
Exactly what Vette do you have in comparison to your buddies Z?
Non Z Vettes weight ~100 lbs more. I'm suspecting you have a non Z.
Also, Z's are geared more aggressively.
The come stock with a 3.42 (or something like that).
Also, a 6 speed manual driven properly and able to withstand the power of the motor, will yield slightly better times than an auto.
Between these three, it could easily make the .2 difference your seeing between your car and your buddies Z even with the power difference.
Actually, I don't see anything to be puzzled about.
Now go get yourself 'mo power!!
Exactly what Vette do you have in comparison to your buddies Z?
Non Z Vettes weight ~100 lbs more. I'm suspecting you have a non Z.
Also, Z's are geared more aggressively.
The come stock with a 3.42 (or something like that).
Also, a 6 speed manual driven properly and able to withstand the power of the motor, will yield slightly better times than an auto.
Between these three, it could easily make the .2 difference your seeing between your car and your buddies Z even with the power difference.
Actually, I don't see anything to be puzzled about.
Now go get yourself 'mo power!!
Last edited by tlaselva; Aug 5, 2005 at 09:03 AM.
Burning Brakes
Joined: Aug 2003
Posts: 828
Likes: 1
From: Wichita Ks
Time of year difference maybe. Plays hard on mine. I just have a stock engine and pulled a 12.64 @ 109 w/ 1.86 ft on regular 555's. Pt2400 and 3.73's with average bolt on's. I guess around 315hp. never dynoed. I will see what drag radials do for me Saturday. I give it all she has off the line, no holding back. Stall it till it almost wants to spin and stab it on go. Usually I fry the tires past the 60ft but it's sure looks good. 
Burning Brakes
Joined: Jul 2004
Posts: 866
Likes: 5
From: Jensen Beach FL
I see you’re in Texas. Were all your runs made in very hot temperatures? First of all I would expect that with 405 RWHP that you’d be trapping 118+ mph. If you made the runs with the run-flats earlier in the season in cooler weather, that could account for the discrepancy. The .4 in the 60’ should have given you at least .6 in the ¼. If the air is considerably hotter it could really affect your results.
This is a complete wild guess but I notice that the DR’s you’re using are probably an inch shorter than the run-flats. I wonder if this could have anything to do with it. Were you going through the traps in 2nd or 3rd gear with the run-flats? Are you going through the traps in the same gear with the DR’s? I don’t know anything about automatics, but could a 1 inch reduction in tire height affect your shift points etc?
It would also be helpful if you could post all your splits. That way we would be able to see where your car is laying down.
This is a complete wild guess but I notice that the DR’s you’re using are probably an inch shorter than the run-flats. I wonder if this could have anything to do with it. Were you going through the traps in 2nd or 3rd gear with the run-flats? Are you going through the traps in the same gear with the DR’s? I don’t know anything about automatics, but could a 1 inch reduction in tire height affect your shift points etc?
It would also be helpful if you could post all your splits. That way we would be able to see where your car is laying down.
Thread Starter
Burning Brakes
Joined: Dec 2003
Posts: 1,074
Likes: 0
From: Dallas (Go Cowboys!!!) :) Tx
Originally Posted by MGorman
I see you’re in Texas. Were all your runs made in very hot temperatures? First of all I would expect that with 405 RWHP that you’d be trapping 118+ mph. If you made the runs with the run-flats earlier in the season in cooler weather, that could account for the discrepancy. The .4 in the 60’ should have given you at least .6 in the ¼. If the air is considerably hotter it could really affect your results.
This is a complete wild guess but I notice that the DR’s you’re using are probably an inch shorter than the run-flats. I wonder if this could have anything to do with it. Were you going through the traps in 2nd or 3rd gear with the run-flats? Are you going through the traps in the same gear with the DR’s? I don’t know anything about automatics, but could a 1 inch reduction in tire height affect your shift points etc?
It would also be helpful if you could post all your splits. That way we would be able to see where your car is laying down.
This is a complete wild guess but I notice that the DR’s you’re using are probably an inch shorter than the run-flats. I wonder if this could have anything to do with it. Were you going through the traps in 2nd or 3rd gear with the run-flats? Are you going through the traps in the same gear with the DR’s? I don’t know anything about automatics, but could a 1 inch reduction in tire height affect your shift points etc?
It would also be helpful if you could post all your splits. That way we would be able to see where your car is laying down.
H/C setup
LT
High Flow Cats w/ X-Pipe
Exhaust
3200 Stall
Vararam
LS1 edit.
About 85+ degree weather here in WA, the runs were made a week apart from each other.
Running through in 3rd. I never really thought of that, I was thinking that it was the additional unsprung mass. I think the added weight might have caused the issues.
Last edited by Tru_Ice; Aug 5, 2005 at 12:33 PM.
Le Mans Master
Joined: Sep 2004
Posts: 7,027
Likes: 6
From: Shiloh Ohio
Originally Posted by tlaselva
Actually, I don't see anything to be puzzled about.
Stock Run Flats (18 x 9.5 y2k rim)
12.47 @ 114 mph / 12.37 @ 114.45 mph
2.195 60 ft / 2.1 60ft
feathering it, then going WOT w/ TC
With Nitto 555Rs 305/35/18 (18 x 10.5 y2k rim)
12.17 @ 111 mph / 12.212 @ 112mph
1.82 60 ft / 1.87 60 ft
2000 rpm launch / 1500 rpm launch
Last edited by shurite44; Aug 5, 2005 at 01:09 PM.
Thread Starter
Burning Brakes
Joined: Dec 2003
Posts: 1,074
Likes: 0
From: Dallas (Go Cowboys!!!) :) Tx
Originally Posted by shurite44
You don't think his times before and after tire change look strange? He is .3-.4 faster in the 60', and .2-.3 faster in the qtr mile, but his trap speed dropped by 3 mph. His only change was DR's. If you don't see anything strange about that please post why this happened because I would be very curious and you would basically answer the question he is posting in the thread.
Stock Run Flats (18 x 9.5 y2k rim)
12.47 @ 114 mph / 12.37 @ 114.45 mph
2.195 60 ft / 2.1 60ft
feathering it, then going WOT w/ TC
With Nitto 555Rs 305/35/18 (18 x 10.5 y2k rim)
12.17 @ 111 mph / 12.212 @ 112mph
1.82 60 ft / 1.87 60 ft
2000 rpm launch / 1500 rpm launch
Stock Run Flats (18 x 9.5 y2k rim)
12.47 @ 114 mph / 12.37 @ 114.45 mph
2.195 60 ft / 2.1 60ft
feathering it, then going WOT w/ TC
With Nitto 555Rs 305/35/18 (18 x 10.5 y2k rim)
12.17 @ 111 mph / 12.212 @ 112mph
1.82 60 ft / 1.87 60 ft
2000 rpm launch / 1500 rpm launch
Tell me about it!?!?
Burning Brakes
Joined: Jul 2004
Posts: 866
Likes: 5
From: Jensen Beach FL
Originally Posted by Tru_Ice
My friend has a Z, I have a Coupe. The only mods on his car are a clutch upgrade, and vararam. As opposed to my
H/C setup
LT
High Flow Cats w/ X-Pipe
Exhaust
3200 Stall
Vararam
LS1 edit.
About 85+ degree weather here in WA, the runs were made a week apart from each other.
Running through in 3rd. I never really thought of that, I was thinking that it was the additional unsprung mass. I think the added weight might have caused the issues.
H/C setup
LT
High Flow Cats w/ X-Pipe
Exhaust
3200 Stall
Vararam
LS1 edit.
About 85+ degree weather here in WA, the runs were made a week apart from each other.
Running through in 3rd. I never really thought of that, I was thinking that it was the additional unsprung mass. I think the added weight might have caused the issues.
You might want to bring both sets of tires with you, and run both on the same night. That will remove some of the variables associated with running on different days.
Sorry I misread I see you’re in Washington, not Texas. Hope I didn't make you home sick.