xtyper

I was bored on New Year's Eve so I decided to make the long trek from LA to Sacramento to test out my 1/4 mile abilities. I was only able to get 3 runs in since the event ended early due to a horrible hotrod crash. The car lost control midway down the track at over 100+ mph and flipped over the wall. Thankfully though the driver was ok.

As for my runs, the few that I got in were quite consistent, with the best being 11.6 at 121mph. Mods at time of run included those listed in my signature, 91 octane Chevron fuel, and MT drag radials.

I must admit I was hoping for a bit better, but after considering a few points I actually felt pretty good. First, I ran the car full interior. Second, I obviously have much to learn in the way of launching the car since this run was accomplished with a horrible 1.91 60 foot (actually my best). And third, the recent correction to the Sacramento timing system seems to have overcorrected the trap speeds, where they now read 2+ mph lower than vbox. So compared to a faster track like Atco where I understand the trap reads about 1 mph higher than vbox, I'm guessing the slip would have shown more like 124mph.

Overall, I considered the trip very worthwhile to finally get some baseline track results to use going forward as I continue to mod and try to improve. Next up will be some lightweight goodies and lots of launch practice.

propain

Only 3 runs is the problem. That sucks. If you got a good 20 runs in you would have killed that time. What was the DA like?

Either way, sounds like a good time at the track!

xtyper

Thanks Jim. Tell me about it with the limited runs. And also it was a Test N' Tune event, so my car was always hot by the time I made it to the front of the staging lanes, with my car sucking in all kinds of smoke from the prior hotrod's massive burnout.

DA was pretty good, about -200ft at time of my runs. But humidity was killer, as the track was super foggy pretty much the whole time I was there. Whatever though, I did have a blast and am now really motivated to improve.

enochroot

Right on.

+1 I'm sure you can squeeze some better times out of that beast after some more runs.

Did you remember to take the baby seat out?
That can slow you down 100th of a second.

propain

Humidity is the killer.

Yup, that's why I hate test and tunes.

xtyper

Hahaha...nope, left the baby seat in as intimidation.

c32AMG-DTM

Glad you got that beast to the track!

Quick question/observation:

Can't speak to ATCO vs. vbox, but AFAIK I've regularly heard that vbox 1/4 mi. trap speed reads a couple MPH higher than NHRA-sanctioned track readings.

Something to do with the NHRA track-reading is an average speed over the last x feet, whereas the vbox was simply grabbing the max MPH at the end of the run...?

Anyone know for certain?

mthis

Congrats does are some nice times with a 1.9 60 foot
Get u 60 down u et will get lower and u trap will get higher.

If u worries about vbox results in 1/4 mines are always .2 mph an .2 et slower at atco and Mir.

mthis

I dont know for sure but at atco my last best run I trapped 128 and the vbox said 129
But (btw thats my highest vbox trap on my car)
My other runs all avg 2-3mph lower on vbox
Some of my 127 traps showed 124mph my 1st pass shows 122 and real track trap speed was 125.

xtyper

Vbox traps should always be a bit higher (~1 mph or so) than the time slip since the vbox measures speed at exact moment of 1/4 mile end, whereas the time slips typically show an average speed for the last few feet of the run. Some tracks read higher though due to equipment inconsistencies, and some read lower. The point I was trying to make was that Sacramento, actually considered a high reading track not too long ago, has since adjusted their equipment to now be a slow reading track, consistently showing trap speeds 2+ mph lower than vbox. These timing equipment inconsistencies are why it's so important to also get vbox readings to make time slips from different tracks more comparable.

xtyper

I've heard that one of the lanes at Atco reads high, the other reads low. Were all of your runs in the same lane? If not, then I bet that's the explanation.

dodger63

You are correct but saying it in the wrong order, one of the lanes at atco is slower not faster

dodger63

Opps congrts on the run though I to tgat you would've done a bit better but only 3 runs, I'm sure you couldve done better

Even Money

FYI, I ran identical trap and ET to what u posted, near Seattle last August. It was + DA and humid, but I can't recall what. It was a test and tune, so no hot lapping. And my best run was the last of four. I had catless mhp headers w Hoosiers. My best 60 was about 1.8. And FWIW, my car consistently dyno'd 445 whp/424 tq.

dodger63

Wow

PetroC63

Nice job Eric!

Once you improve on the 60' times your ET's will drop considerably.

Test N Tune's are hit or miss. I've attended some were I made 15 runs and others were I made 0 runs.

xtyper

Thanks Mike. I think with decent DA, I should be able to pull off better times at Famoso, all else equal. The trap there reads higher (more consistent with vbox) and the prep is usually better.

My goal for the next Famoso outing is 11.3x @ 123.x mph. If I want to have any chance at joining the 125+ mph club, some weight reduction (seats, rotors, rims) will definitely be called for. A Famoso private rental can't come fast enough for me!

AMGFTW

Nice runs!

A little better 60' and a day where you can make 10+ passes and you should get there.

Merc63

Didnt you dyno 500RWHP and only 121mph? Something seems off or is it me?

I was trapping 119mph with just a tune (510Hp at the crank)... And our track is a slow one.

xtyper

Yes, well I honestly think the dyno I used for the recent 500whp pull reads high, so I'm going back to my usual spot later this week to verify. Given my last pull there of 470whp, I expect to be around 475whp now with the addition of the ROW airboxes.

So noting real dyno numbers closer to 475whp, that Sacramento trap now reads low compared to other popular tracks, the bad 60 ft launches, and the high humidity conditions, I think the results are right where they should be.

With lots of launch practice and repeated runs, I bet the car would have run more like an 11.3x at 125.x mph at a track like Atco or MIR under good conditions (better launch worth about 0.3 improvement and Sacramento vs. Atco trap differential about 4-5 mph).

dodger63

That run at atco should be closer to 10.90 @ 130 and prob 10.80 or so at mir

xtyper

Really? Wow, if that's the case maybe I do need to take a cross country road trip.