just a few dyno questions...

**BITRBO** · 01-06-2009 09:42 AM

Welp, I finally got some time (and cash) to dyno the S, so here is my plan: Two (2) pulls in stock setting on 93 OCT., two (2) pulls on "pump" mode with 93 OCT., and two (2) pulls in "race" mode w/ some 104 or 110 OCT. The runs would be in that order, and I would show up with 1/8 or less of regular pump in the tank; I'd drop in about 5 gal. of some race gazz before the last two pulls.

So here are my questions:

1. For the first run, I would kinda like to simulate my car as it would have been "stock". This would mean some how reducing any benefit gained by the catback. Obviously I don't want to put my stock exhaust back on, so I'm looking for a relatively quick/simple alternative (i.e. manually restricting the exhaust in some way). I was thinking of packing the tips with a little steel wool or other type of semi-restrictive material, just to add a little extra back pressure. No too much, just a few HP or so. Has anyone done this before, or have any thoughts?

2. Secondly, I would like to log all of these pulls with VAGCOM, but I'm not sure if that's the best software for the job. Maybe ECUx would be better, IDK?

Also, which would be the most useful blocks to log?

3. And lastly, does anyone in Miami know where to get some 104 or better?? The closest that I know of is Homestead/Miami Speedway...

And please don't say the Sunoco on Sheridan, cause I'm pretty sure they only carry 99 OCT.

**nizmosx** · 01-06-2009 09:47 AM

i wouldnt bother restricting your exhaust. if the exhaust is advertised as 6whp, just dyno the car with it, and subtract the 6 from your final output. I dont see the point in restricting it.

**BITRBO** · 01-06-2009 09:49 AM

Originally Posted by nizmosx

i wouldnt bother restricting your exhaust. if the exhaust is advertised as 6whp, just dyno the car with it, and subtract the 6 from your final output. I dont see the point in restricting it.

yeah, that's probably what I'm going to do, but you know how those ratings are... sometimes pretty optimistic/inaccurate.

**AudiSportB5S4** · 01-06-2009 10:01 AM

To answer the logging question... It would be ideal to just get ECUx on there, so you can see everything all at once, and it is much easier to look at everything in the graphs.

**lowandslow4now** · 01-06-2009 11:06 AM

If I remember correctly the sunoco on 27 north of pines but I havent lived down there in about a year so things couls have changed.

**BITRBO** · 01-06-2009 11:53 AM

cool. thanks for the help guys!

**BITRBO** · 01-09-2009 10:24 AM

Okay, so I found a Murray's Speed & Custom out in my area that sells some high-octane stuff in 5-gal jugs:

104 OCT. ~$57
112 OCT. ~$58
116 OCT. ~$70

So my questions are: 1.) Do these prices seem a bit high to anyone else? 2.) Will the 116 OCT. give any significant benefits over 112 running the "Race" program for GIACx?

**jibberjive** · 01-09-2009 10:32 AM

100 oct from the pump here is ~$6/ga

**BITRBO** · 01-09-2009 11:43 AM

yeah, this stuff works out to about $11, $12, and $14/gal. respectively... I called the only nearby track and the have 110, 112, and 118 for $9, $11, and $14/gal. respectively. I'm not sure how this compares to the rest of the nation for the higher OCT. stuff, but it seems a bit high...?