Tell me if you guys think this is an acceptable tuning method.

Local area Dyno vs Wideband O2 and Gtech pro v2

Problem is; local area dyno sucks, I don’t trust them, have had too many bad experiences there.
Not to mention, wideband O2 up the tailpipe is far less accurate than a true wideband positioned before the CAT.

…I’m now attempting to take matters into my own hands.

As I understand it, the Gtech pro blows because its correction method does not yield “real-world” results. However, perform the same test 12 times in a row, and expect to see the same result. …In other words, it’s accurate within itself.
If this holds true, I don’t see a problem in using it for tuning.

Correct me if I’m totally off base here, but the way I see it, If I have my correct A/F reading, and an accurate form of measuring HP I can adjust Cam angle, fuel pressure, timing, etc. as effectively as a Dyno center, no?

-ryan
?¿

 

i personally never got consistent results with the gtech.
but if you are gonna try to tune yourself, why cant you do that at the dyno?

 

Dyno = poo where I live... Consider it not an option at this point.

So you're saying "no, the gtech is not consistent with itself" ?
I've always heard it was... just not reflecting results in relation to the real-world.



[Modified by oryanh, 2:19 PM 3/12/2003]

 

thats what consistent means.

whats wrong with the local dyno?

 

<rephrasing>
Example: 1/4 mile time on the track shows 14.2 -14.4
Gtech pro shows an inaccurate reading of 13.3... but consistently.

So yes, agreed the gtech pro is dead wrong, but wrong consistently.
I just want to measure a degree of improvment.
-------
Conceptually speaking, the Dyno only serves to simulate horse power by adding "fake" resistance.
The only other pro, is getting an A/F reading most cannot afford.

…and while I’m on the subject. I plan to use the DIY WB techedge kit for wideband.


Joo pickin up what I'm tro-in down?




[Modified by oryanh, 2:35 PM 3/12/2003]

 

you are talking about accuracy, im talking about consistency.

dont really need a/f reading when tuning

simulate hp by adding "fake" resistance?
the resistance is pretty real and if you are talking about a dynojet then
its just accelerating a known mass.

 

Well, I think I'm getting off the subject a bit...

My goal is to tune [safely] and be able to measure a certain degree of improvement. i.e. gtech.

"known mass" - Ok now I understand. So a Dyno would be more accurate since it's measuring against something consistent.
I don't plan on posting plots, I'd rather see and log improvement than think I'm feeling one. (butt-dyno)

 

Did you see that Nology PDA-dyno thing? Like a datalogger that also uses acceleration calculations to produce a torque/hp chart. It may prove useful to you if the real dyno is out of the question. Road tuning is another very viable option if you have the right logging equipment.

edit-if you're skeptical on the "dyno" function of a portable device like that you could always just compare the speed vs time graphs. Faster is better of course.


[Modified by SurferX, 12:54 PM 3/12/2003]

 

...never heard of it.. but thanks, I'll totally check that out.
I have used a Geez Box, it's more of an autoX tool.

 

dang 349.00 that's a bit expensive.
I wonder how accurate it could be connected to the ECU.

 

Even assuming that the GTech is consistant (which it more than likely is), you will do better to tune on the dyno, period. Sure, the GTech may show you that certain settings have reduced an E.T., but it can't show you what your HP/TQ curves look like, where changes should be made, etc. At the most, the GTech will be able to inform you of peak HP, which is only marginally useful for effective tuning.

 

apexi rsm works ok

 

Very true

 

I ran across this a while back. Seems interesting; similar to the GTech, but more sophisticated. Anybody ever heard of this or had experience with it?

http://www.charm.net/~mchaney/roaddyno/index.html

 

OK, well that settles it.

Thanks guys.

Is there anything out there that could show HP curves?
(EDIT)
That Road Dyno looks like it presents a HP curve. -sweet.


[Modified by oryanh, 5:32 PM 3/12/2003]

 

hondata

 

As in Hondata data logging? How easy is that to get into a PC in recognizeable form? Or... does the data logging option include software that's similar to the RoadDyno software?

 

You're probably thinking of the old Gtech, the new one is capable of displaying dyno charts, speed vs time graphs, etc. which would be useful for tuning purposes.

 

datalogging software is included, however the datalogging option is extra



with the g-sensor, you can create hp/tq curves.

 

Hmmm... stupid question.
Should I sell my V-afc and get a Hondata?

 

Ya, I've looked at your site That software looks pretty powerful.

Seems kinda odd that you'd need that option for that purpose since you can calculate acceleration from RPM/t. Useful for the lateral logging, though.

 

If you don't have a Hondata tuner in your area (which I'm guessing you don't) then no. You'll need to spend about $1000 or so on a Hondata setup that you can tune for yourself.

edit- Not that the full blown Hondata setup isn't worth that much, but since you seem to want to save money I imagine a Hondata Stage 4 setup (or S200 is what they call it now or something plus needed options) won't be an option for you.


[Modified by SurferX, 4:17 PM 3/12/2003]