E/T not dropping..something array?

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Sep 1, 2002 | 07:58 AM

TIMSPEED

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Le Mans Master

Joined: Mar 2001

Posts: 9,464

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From: Modesto CA

E/T not dropping..something array?

Ok, well. Since I did mods and went back to the track, my E/T was .1 seconds faster..am I missing something here? Here's the lowdown.
Previous Best:2.1x 60' / 13.9@99mph
75º Ambient Temperature @ Sacramento Raceway (10am)
Coolant Temp when I launched was at 170º
MODS: (Other than stock for an 87 Z52 A4)
-K&N Filter with Open Air Lid/DeScreened MAF
-TB Coolant Bypass/190º:180º Aux. Fan Switch wired to main fan also
-Holley Annihilator HEI Module/Hypertech PowerCoil Kit/MSD SuperConductor's/AC-Delco Rapidfire #5's with CutBack Electrode's Gapped @.040
-Dynomax Rear Y-pipe (3"-2¼" with a Cross-Over Tube)/Muffler Eliminators
-AFS ZR1 5-spoke 17"x9½" w/ 275/40 ZR17 Bridgestone Potenza RE730's (35psi cold)
New Best:1.84 60' / 13.7@97
60º Ambient Temperature @ Sacramento Raceway (10pm)
Coolant Temp when I launched was at 185º (Waiting in the Staging Lanes doesn't help much)
MODS: (New Mods)
-Yank Stealth 2600 Converter/26k GVW B&M SuperCooler/Trick Shift Fluid
-MAD 2½"-3" PreCatLess Front Y-pipe/Random Tech 3" High Flow Cat
-26"x11½ E/T Streets (On Factory 16"x8½" 85 Rims) @ 13psi/ 15"x3½" M/T Front Runners

So, my thoughts are somethings up...maybe I'm getting false knock? Maybe I need to drop my fuel pressure and get an underdrive pulley? I dunno..you pros tell me. :confused: :cheers:

Sep 1, 2002 | 09:23 AM

Nathan Plemons

Race Director

Joined: May 2001

Posts: 14,165

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Re: E/T not dropping..something array? (TIMSPEED)

Before you do any more mods try to figure out what is up. Have you tried to ditch the E.T. Streets? Personally I can't drive on them, I can run just as fast on my street tires. Those are some nice 60's though.

Some people complain about racing a dyno, I couldn't disagree more. It's an invaluable diagnostic tool and it will let me know if I'm wasting my time or not at the track. I would see about renting a dyno somewhere. Make some pulls and look at the A/F ratio throughout the run. See if and where the power starts to drop, etc. If there are any sudden drops it's probably knock. Try to retard the timing a little bit, etc.

A dyno is a wonderful thing and it's in a controlled environment. Make sure you are actually making the power you need before you go out and pound it at the track. You may find you are wasting your time at the track.

In my case I usually find that the car makes plenty of power and I just can't utilize it at the track. At least I know the car is healthy and I just need practice.

Sep 1, 2002 | 10:23 AM

QuickVet

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Joined: Feb 2000

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From: CT

Re: E/T not dropping..something array? (Nathan Plemons)

you beat your previous best. that is a good sign. that is cool. practice with what you got, it will go faster :yesnod:

Sep 1, 2002 | 11:35 AM

Team Owner

Joined: Dec 2000

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From: Phila., PA burbs

Re: E/T not dropping..something array? (TIMSPEED)

I'm not a pro by any means, but judging by your outstanding 60' time I would have to think your 1/4 mile times should be quicker.............maybe some type of tuning issue?

Sep 1, 2002 | 02:19 PM

REDGAR

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Joined: Feb 2000

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From: Lithia FL

Cruise-In II & IV Veteran

CI VI Drag Champ!

Re: E/T not dropping..something array? (TIMSPEED)

Tim can you give us the comparitive MPH numbers.

Sep 1, 2002 | 03:09 PM

TIMSPEED

Thread Starter

Le Mans Master

Joined: Mar 2001

Posts: 9,464

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From: Modesto CA

Re: E/T not dropping..something array? (REDGAR)

I COULD have. But I don't have my previous best timeslip anymore. I DO have my new one and here it is. (My previous best timeslip, all the #'s were just a little bit slower at each point)

Reaction: .472 (I redlighted, OOPS!)
60': 1.841
300': 5.585
1/8th Mile: 8.713@77.861mph
E/T: 13.745@96.653mph

If it matters, both times I just left the tranny in Drive (it shifts at 5k). I've tried shifting manually at 5200, but it doesn't seem to affect anything.

Sep 1, 2002 | 04:27 PM

REDGAR

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From: Lithia FL

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CI VI Drag Champ!

Re: E/T not dropping..something array? (TIMSPEED)

Tim, either the clocks are really off or you have an issue with the car:(

I looked at my avgs with my 60' between 1.8 and 1.9 and my 1/8 ET avg is 8.14 and my 1/4 ET avg is 12.7.

My avg MPH for that range is 108.30.

Now weather is a significant factor as is you altitude but something doesn't seem to be right.

Hopefully you can compare numbers with other drivers in CA.

Sep 2, 2002 | 10:27 AM

Mr Mojo

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From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo

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I would think weather plays a part also.
In my case, I did the gear change and torque converter(2800).
My best was a 13.37@102.5 stock, with the new setup, I only goyt a 13.35@101mph untill the weather started getting better. Currently, my new best is a 13.02@103.5MPH. a nice improvement, but I'm still not satisfied.

BTW, my 60' went from a best of 1.95 to a new best of 1.74 and again, I'm still not satisfied.