Confusing time slips. What's wrong
Thread Starter
Racer
Joined: Jul 2003
Posts: 398
Likes: 0
From: Calera AL
Confusing time slips. What's wrong
I ran my car last night for the first time since the head and cams and dyno tune
at MTI. I pulled 412 RWHP locked and 393 unlocked. So, I invested in some BFG 315/35/17 Drag Radials mounted on ZR1 17x11 wheels to help out with traction.
Well I got my 60' down from 1.88 (11.95 @119) on the first pass to a
1.72 (11.72@121.49). If I am trapping at 121+ with 1.72 60 foots I thought I'd
be running 11.50s. I see other folks with similar cars running 11.40s @115 with similar 60' times. I am confused as to how I can have such a high MPH
and and sucky ET with what I feel is a decent 60'.
Also my MPH kept going up on all 4 passes even though my ET dropped on
every pass. I thought as your ET dropped your MPH dropped, and vice versa.
The car is running 3.42 gears and a Yank SS3600 converter. Shouldn't my ET be better than that, or is that about right. I expected 11.50s out of the car.
Weather was foggy and 70 degrees and 11pm at night at 750' Above sea level.
Please give me some direction here....or am I doing ok for an amateaur.
at MTI. I pulled 412 RWHP locked and 393 unlocked. So, I invested in some BFG 315/35/17 Drag Radials mounted on ZR1 17x11 wheels to help out with traction.
Well I got my 60' down from 1.88 (11.95 @119) on the first pass to a
1.72 (11.72@121.49). If I am trapping at 121+ with 1.72 60 foots I thought I'd
be running 11.50s. I see other folks with similar cars running 11.40s @115 with similar 60' times. I am confused as to how I can have such a high MPH
and and sucky ET with what I feel is a decent 60'.
Also my MPH kept going up on all 4 passes even though my ET dropped on
every pass. I thought as your ET dropped your MPH dropped, and vice versa.
The car is running 3.42 gears and a Yank SS3600 converter. Shouldn't my ET be better than that, or is that about right. I expected 11.50s out of the car.
Weather was foggy and 70 degrees and 11pm at night at 750' Above sea level.
Please give me some direction here....or am I doing ok for an amateaur.
Team Owner
Joined: Feb 2000
Posts: 32,545
Likes: 2
From: Lithia FL
Cruise-In II & IV Veteran
CI VI Drag Champ!
First, your MPH seems high for your dyno. Bet you did not expect that 
I dyno 403 and trap 118.
Your 60' is off. You should be close to where I am at 1.64 or lower. Getting the 60 down will get you in the 50's
Your MPH is VERY high for your ET indicating something is not right. I have run 121 in the 11.30 range
Did you notice your shift points? Maybe they need to be adjusted.
Have you weighed the car?
I dyno 403 and trap 118.Your 60' is off. You should be close to where I am at 1.64 or lower. Getting the 60 down will get you in the 50's
Your MPH is VERY high for your ET indicating something is not right. I have run 121 in the 11.30 range
Did you notice your shift points? Maybe they need to be adjusted.
Have you weighed the car?
Pro
Joined: Oct 2004
Posts: 510
Likes: 5
From: Pipe Creek TX
Look at the 330 and 660 ft times of the 115 mph, 11.40 cars.
Even though their 60 fts are close to yours; they are more efficent at the other incrementals.
Usually , they will be turning peak rpm at the finish line , the same as their shift point.
Even though their 60 fts are close to yours; they are more efficent at the other incrementals.
Usually , they will be turning peak rpm at the finish line , the same as their shift point.
Thread Starter
Racer
Joined: Jul 2003
Posts: 398
Likes: 0
From: Calera AL
Originally Posted by comp
does it feel soft in 2nd, then pull hard???
built by MTI, stage I automatic. But it does break loose quite a bit
on the 1st to 2nd shift...it chirps 2 to 3rd. Could that hurt my times?
my 1/8 mile is ~ 7.5 @ 93MPH and my 1/4 mile is 11.72-11.76 @ 120-121MPH
Thread Starter
Racer
Joined: Jul 2003
Posts: 398
Likes: 0
From: Calera AL
Originally Posted by REDGAR
First, your MPH seems high for your dyno. Bet you did not expect that I dyno 403 and trap 118.
Your 60' is off. You should be close to where I am at 1.64 or lower. Getting the 60 down will get you in the 50's
Your MPH is VERY high for your ET indicating something is not right. I have run 121 in the 11.30 range
Did you notice your shift points? Maybe they need to be adjusted.
Have you weighed the car?
I dyno 403 and trap 118.Your 60' is off. You should be close to where I am at 1.64 or lower. Getting the 60 down will get you in the 50's
Your MPH is VERY high for your ET indicating something is not right. I have run 121 in the 11.30 range
Did you notice your shift points? Maybe they need to be adjusted.
Have you weighed the car?
The car weights 3150 on a CAT truck scale. I know I tried lightening it up
as much as I could. The car is shifting from 1-2 at 6200 and from 2-3 at 6500
Thread Starter
Racer
Joined: Jul 2003
Posts: 398
Likes: 0
From: Calera AL
Originally Posted by SG4206
Look at the 330 and 660 ft times of the 115 mph, 11.40 cars.
Even though their 60 fts are close to yours; they are more efficent at the other incrementals.
Usually , they will be turning peak rpm at the finish line , the same as their shift point.
Even though their 60 fts are close to yours; they are more efficent at the other incrementals.
Usually , they will be turning peak rpm at the finish line , the same as their shift point.
but that is what I was seeing.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
Thread Starter
Racer
Joined: Jul 2003
Posts: 398
Likes: 0
From: Calera AL
Originally Posted by SG4206
Have you dynoed this ? What rpm is peak torque and hp?
If you haven't , this might help you answer some questions.
You'll want convertor stall at peal torque.
If you haven't , this might help you answer some questions.
You'll want convertor stall at peal torque.
Horsepower peaks at 6000 at 411-412RWHP and stays there til 6500. Right
now the converter stalls at 3600.
The car seems to be slow in the first 1/8 mile and charges from the 1/8 mile
to the 1/4 mile mark. At least that is what the timeslips say. From inside the
car it feels strong in the first 1/8mile and weaker on top side.
How unusual is it for a car to pick up 27MPH from the 1/8 mile to the 1/4 mile
mark. It goes from 92/93MPH in the 1/8 to 120-121MPH in the 1/4 mile. Is that
odd?
Race Director
Joined: Oct 1999
Posts: 13,298
Likes: 14
From: Somers NY
>>How unusual is it for a car to pick up 27MPH from the 1/8 mile to the 1/4 mile
mark. It goes from 92/93MPH in the 1/8 to 120-121MPH in the 1/4 mile. Is that
odd?>>
Picking up 27 mph in the last 1/2 of the track is GREAT .. my car runs 87 mph in the 1/8 & 110 in the 1/4 it only picks up about 22 mph.
mark. It goes from 92/93MPH in the 1/8 to 120-121MPH in the 1/4 mile. Is that
odd?>>
Picking up 27 mph in the last 1/2 of the track is GREAT .. my car runs 87 mph in the 1/8 & 110 in the 1/4 it only picks up about 22 mph.
Team Owner
Joined: Feb 2000
Posts: 32,545
Likes: 2
From: Lithia FL
Cruise-In II & IV Veteran
CI VI Drag Champ!
I pick up 23 - 26 mph depending on configuration and weather ( I use different wheels some times).
Maybe you are losing a tenth in the 1-2 shift.
What tire pressure you run in those bfgs?
Maybe you are losing a tenth in the 1-2 shift.
What tire pressure you run in those bfgs?
Thread Starter
Racer
Joined: Jul 2003
Posts: 398
Likes: 0
From: Calera AL
Originally Posted by REDGAR
I pick up 23 - 26 mph depending on configuration and weather ( I use different wheels some times).
Maybe you are losing a tenth in the 1-2 shift.
What tire pressure you run in those bfgs?
Maybe you are losing a tenth in the 1-2 shift.
What tire pressure you run in those bfgs?
Can you san firm shift! It is still too hard on the 1-2 shift. Just pulling on
the highway on a right or left turn it slips sideways on the 1-2 shift at even
very light throttle. They said they got the line pressure as low as they
could go with it.
The BFG's didn't hookup all that bad IMO given the foggy weather and horrible
track. Heck street tired Mustangs and F-bodys were running high 15's spinning
like crazy.
The 1-2 break out at the track was my initial guess as to why my 60' wasn't just too bad but the 1/8 mile time seemed slow. Do you think if I go to the
CCW drag package that I might break the output shaft on the 1-2 shift?
I am getting concerned about it.
I will be back at the track (Montgomery Motorsports Park this time) on
Nov 12. I am confident that I do at least a little better.
Team Owner
Joined: Feb 2000
Posts: 32,545
Likes: 2
From: Lithia FL
Cruise-In II & IV Veteran
CI VI Drag Champ!
Is the shaft hardened?
I have not really seen A4s breaking shafts though I did break on recently but I think it was just a bad shaft.
I might be good to just wait till the next time our to see how it goes.
Maybe put more gas in it so you have a little more weight over the rear tires and see how that goes.
I run my BFGs at 19 by the way.
I have not really seen A4s breaking shafts though I did break on recently but I think it was just a bad shaft.
I might be good to just wait till the next time our to see how it goes.
Maybe put more gas in it so you have a little more weight over the rear tires and see how that goes.
I run my BFGs at 19 by the way.
Le Mans Master
Joined: Jun 2003
Posts: 9,251
Likes: 217
From: 2007 Nat'l Corvette Challenge 11.50 index Champ. New Jersey
Originally Posted by X_03_Cobra_guy
I ran my car last night for the first time since the head and cams and dyno tune
at MTI. I pulled 412 RWHP locked and 393 unlocked. So, I invested in some BFG 315/35/17 Drag Radials mounted on ZR1 17x11 wheels to help out with traction.
Well I got my 60' down from 1.88 (11.95 @119) on the first pass to a
1.72 (11.72@121.49). If I am trapping at 121+ with 1.72 60 foots I thought I'd
be running 11.50s. I see other folks with similar cars running 11.40s @115 with similar 60' times. I am confused as to how I can have such a high MPH
and and sucky ET with what I feel is a decent 60'.
Also my MPH kept going up on all 4 passes even though my ET dropped on
every pass. I thought as your ET dropped your MPH dropped, and vice versa.
The car is running 3.42 gears and a Yank SS3600 converter. Shouldn't my ET be better than that, or is that about right. I expected 11.50s out of the car.
Weather was foggy and 70 degrees and 11pm at night at 750' Above sea level.
Please give me some direction here....or am I doing ok for an amateaur.
at MTI. I pulled 412 RWHP locked and 393 unlocked. So, I invested in some BFG 315/35/17 Drag Radials mounted on ZR1 17x11 wheels to help out with traction.
Well I got my 60' down from 1.88 (11.95 @119) on the first pass to a
1.72 (11.72@121.49). If I am trapping at 121+ with 1.72 60 foots I thought I'd
be running 11.50s. I see other folks with similar cars running 11.40s @115 with similar 60' times. I am confused as to how I can have such a high MPH
and and sucky ET with what I feel is a decent 60'.
Also my MPH kept going up on all 4 passes even though my ET dropped on
every pass. I thought as your ET dropped your MPH dropped, and vice versa.
The car is running 3.42 gears and a Yank SS3600 converter. Shouldn't my ET be better than that, or is that about right. I expected 11.50s out of the car.
Weather was foggy and 70 degrees and 11pm at night at 750' Above sea level.
Please give me some direction here....or am I doing ok for an amateaur.
Thread Starter
Racer
Joined: Jul 2003
Posts: 398
Likes: 0
From: Calera AL
Originally Posted by SG4206
X 03 -
Are you foot braking to 3600 rpm , or is the convertor flashing to 3600 at launch?
Think about this; the HP is greater at the higher rpm launch; which means the car will accelerate faster.
Are you foot braking to 3600 rpm , or is the convertor flashing to 3600 at launch?
Think about this; the HP is greater at the higher rpm launch; which means the car will accelerate faster.
forward no matter how hard I smashed the brakes. If I pulled up on the emergency brake as hard as I could I can get it to hit 3400K. What's the
trick? Trans brake?
I was shocked how it just shoved the fronttires.
Thread Starter
Racer
Joined: Jul 2003
Posts: 398
Likes: 0
From: Calera AL
Originally Posted by Dr.Ron
I don't think you're trapping too high. I have 370RWHP & trap at 119.x. I ran a new best of 11.62 last week w/ a 1.68 60' in my ZO6 that only has a Vararam & LS1 edit done . Are you doing a decent burnout? What are you launching at? The wheel spin is costing you some ET. W/ that MPH your ET's should be better.I think you should be in the 11.2+ range, but what do I know??
I put 4.71 gears in it and a 4000K stall and trans brake ans slicks, I could probably run 10's but this is a street car. My original goal was to beat a Z06 with
an automatic, but that has turned out to be harder than I origianlly thought