i have an accelerometer coming in the mail. it is teh tazzo one. it can be set up to recreate et's for 60ft, 0-60, 1/8, and 1/4 mile. since the testing it will be used for will mostly be on teh street i was wondering if 0-60 or 1/8 mile times can be used as just an accurate gauge for improvements as runnign a full 1/4 mile?
i plan to tune it to recreate englishtowns et's since tha tis the track i run at the most.

thanks
tim

Craig moates' scan software can show 0 2 60 1/4 mile etc

I find my butt 'o' meter works quite well!

Simon

The dyno's always good, but logistically a challenge.

If you can get repeatability nailed down on a dragstrip, eg. traction, ambient temp + humidity, etc. the 1/4mile is a good place...but a lot of variables not under your control and limited availability.

The accelerometer is a great way to test. I was using a GTech for a while as a "before and after" test procedure. Just make sure you put the *exact* same vehicle weight in each time, and again pay attention to ambient conditions as they'll influence the results.

1/8 mile GTech will get you close, and then final dialin at a 1/4 mile track.

Using a WB, and GTech, makes life real easy.

Has anyone tried the GTech Pro that recently came out. I saw it in passing and wasnt sure what features it offered over the GTech. I have been putting of getting the GTech but I have heard enough favorable opinions of it. There is a dyno shop just up the road but would hate to have to drop more cash everytime.

Butt O Meter works good sometimes but its also attached to your mind and that isnt always as accurate. At least mine isnt...

FWIW, I use Craig's software, same stretch of road, third gear (around 1500-1700 rpm) and measure time to accelerate from 30-75 mph. 75 mph is around 4600 rpm or so and not shifting removes a variable. This'll be accurate to within .1 second or so, which is about as good as Gtech or other methods will get you...

I think the Gtech is junk. Its too easily influenced by outside conditions. I prefer the strip. So far its helped out tremendously. But then again there are outside influences.

I have taken my car from a 13.8 sec to a 12.7 sec with tuning so far at the track. I ussually burn a few chips that contain the data that I want to try and test it at the track. The last chip I burned that leaned out the car from 11.9-12.2 and moved it up to 12.7 on my WB gained my .2 sec almost everywhere and nearly 2 MPH in the 1/8 mile, but I think my tranny gave up the gusto and wouldn't go into 3rd Still turned a 13.01@92MPH. That run would have been easily my best.

Don't get me wrong, the Gtech is alright, but not what I prefer. The strip is where a few tenths matter and are seen so that is why I tune there.

Its not easy for me to get there either. I have to drive 2.25 hrs each way. But that is what I like, so I don't mind.

Just my .02

Tim, we'll just first do a bunch of runs in a slow POS. See how consistant it is (slower the better) then just try it with our cars and a block of wood under the pedal (slow and no tire spin). See how accurate it is, then make some runs. It'll be obvious if we're making things for the better or worse from the tazzo, butt dyno, and plug cuts will tell us enough to be semi consistent. If the tazzo spits out a 13.4 and then a 13.4 and then a 13.4 with the same eprom, I think it's gotta be pretty good.
As for the track, yes, it is the only way to measure performance BUT some of us can't afford the time and money to keep going to the track, especially at e-town which lets you run ony 3 times and for like $30 or whatever it is.

Sounds like a job for a TBI car....

(ducking)

https://www.thirdgen.org/techbb2/sho...hreadid=111679
https://www.thirdgen.org/techbb2/sho...hreadid=112208

Anyways, yes, actually there are plenty of slow TBI car's, it's called a truck and/or cav (Tim, ).
BTW, until somebody can show me a slip of a similar car with my crate motor that is running faster than 13.8 at 102....hahaha, and that was with 2.2 60', go figure .

do not mock my cav jp!!!! it can run 19's all day long(and yes i do have the tiemslips to prove it)


later
tim