Would anyone be interested in a group dyno day at Rocket Rally? I'll be getting a Cobb Accesport soon, and I'd like to do a before-and-after run on the dyno. I don't know if Rocket Rally will give us a discount on pricing or not, but it will be fun regardless to have a group go up there.

I won't set any dates until I see some interest. I imagine it would only be practical to have less than 10 people or so, unless people want to wait around a long time, but I'm sure Jamie will post his $0.02 on that.

We were planning on setting up a Nasioc Dyno day. The price will stand at $80 for 3 pulls as it is very reasonable. We could definitely do 10 cars in a day. Eventually we would like to get it up to 15-20 cars for a full day. Not everyone has to show up at the same time either. Right now I would count on an average of 40 minutes per car. We've been getting a lot of cars in (non-subies too!) and it is a lot of fun. Anyways, perhaps the last weekend of October we could set something up. Anyways, Banman if you want to organize something I'd be more than happy to hold a day. We could provide lunch or something for people and maybe even do a competition where whoever pulls the highest number gets a prize.

Jamie, is one pull sufficient to get a good HP figure, or do you need multiple pulls to obtain an average?

I was just wondering whether I would need more than 3 pulls to compare HP figures before and after doing an AP map upload.

I am interested to get a baseline before I boost.

Steven, one pull is definitely not enough (and you would pay for three anyways as it is the set-up time that takes awhile. For you I would say book an hour. Do three pulls at stock, swap maps and then do about 5 with the COBB. The ecu will learn as you are doing it but you want to get at least two consecutive even runs to get you accurate numbers.

That would be a pretty fun day.

I think whoever has the most legacy turbo should win a prize.

Or, how about the lowest hp?

im down!!! i wanan do a baseline run on my car

T. you could do a baseline for both cars (although auto is funky) AND the bike. Yes, the dyno takes bikes.

That would be a pretty fun day.

I think whoever has the most legacy turbo should win a prize.

Ha. I'll win that one !! Look out.

whoever has the most % increase over stock should get a prize? or is that unfair for your poor STi guys....poor guys. :D

whoever has the most % increase over stock should get a prize? or is that unfair for your poor STi guys....poor guys. :D

But then you'll need two different dyno days...well, at least for me. I think I'm looking at a 100% power increase :)

hey guys, dyno day sounds like fun

I'm going to put up a dyno faq soon but there are a few things you should know (the faq will be on the site in a few days). This stuff is for ANY dyno (be it ours, others etc.) so you can also understand other people's claims in the Proven Power Braggin forums :p

0) dyno pulls are very consistent if done properly. mr. "full pull" slater can get them almost identical every time (assuming the car is the same) for pulls 1/2/3

1) despite item 0, the subaru ECU uses an 'active' ignition timing strategy, so depending on what the ECU feels like doing, you can have variance run to run. This variance can be more than you think, but its really the ECU (we can prove it too). But if you minimize the variables that will affect the ECU, then you get a consistent run. Minimizing these variables includes doing a pull (that is why we do them in sets of 3).

2) Despite #1, Some programs in the ECUs may use less "active" advance, which means they are more consistent on the dyno (unless they are really 'hot' and the ECU pulls timing anyways). Agressive tunes which are closer to the edge will by nature have more variance. **THIS IS HIGHLY DEPENDENT ON THE TUNE AND HOW THE CAR RUNS**. You can pretty much tell how much a tuner lets the car advance by spending some time on the dyno. If you see a good one and then it goes way south, the tune was agressive for the cooling available. Or if you see it go sky high with faux fanning, its again the same scenario.

3) If you just reset your ECU, expect much more variance run to run **THIS IS HIGHLY DEPENDENT ON THE TUNE AND HOW THE CAR RUNS** If you do a pull just after a reset you will have varying numbers as the ECU learns, unless the map in there doesn't have much room to learn based on the conditions etc. After a reset, we normally set the AM either directly with some loading, or with a pull. So it is good to do multiple pulls. i.e. map A and map B can have the same timing numbers, but you can get different pulls on the dyno. The "learned state" IS NOT THE SAME AS "instantaneous timing adjustment" which the ECU does as well when it detects knock and pulls timing, but doesn't touch the AM.

4) IC Cooling is the biggest factor, but it is not so simple. If you do a pull but the fans only simulate a certain amount of airflow, it will pull timing. Likewise, if you "over fan" you can get nice dyno graphs but when you drive it in 3rd up a big hill it will knock like crazy. We've road tested the cars and the fans simulate what you see on the road (5th is more air, 3rd is less). Some shops will run more fan to get fat numbers, others less so the tunes are better. The best scenario is a car that will use advance as it can, and wont when it cant. So if you want a dyno day you should specify "all fan dyno queen" or "realistic fan" operation.

5) We can probably do 15-20 cars in a 8hr day if they are *all* subarus and none are crazy low and they all run properly. Worst case is about 40 mins/pull. Best case is 20. Any diagnosis / explanation equals more time !! For the first dyno day I'd like to see 10-12 cars. If we get 12 we will throw in AFR, boost metering and possibly DD logging for free. For existing custom tune/reflash customers, since you get free tuning with dyno time, this is probably not the best time to come (i.e. we wont have time to do any tuning) !

6) our Dyno is a Dyno Dynamics dyno, *the most accurate* and best load-holding tool for detecting whp. Zero variance in controlled pulls back to back with fixed ECU timing. However, people often seem shocked when their 300hp sti (stock) reads 215 or 220whp. THAT IS NORMAL for these dynos... so dont freak out ! Theres lots of threads here that show the 'normal' DD numbers for stock.

7) every dyno is different. If you want dynojet or mustang-ish #s you have to multiply by 1.18 or so, 1.25 for dpack.

Whew, there's the dyno faq right there ! Anyways, if you guys are up for it this weekend (sat) is good for me (even if tora's not into it - just kidding dood). Otherwise it will be a while as we are pretty much booked for 3 weeks.

Thanks for the FAQ, Pat. This Saturday's no good for me (other people are welcome to go, of course!) I guess we'll have to book ourselves in for three weeks down the road, then!

T. you could do a baseline for both cars (although auto is funky) AND the bike. Yes, the dyno takes bikes.


really .... ?? :eek: even my bike is only one wheel drive ? :lol:

Rocket Rally = Subie Love

ok, its three weeks down the road... should we try to schedule it ? we have some nissan dudes and some audi dudes that also want to do days, so I want to lock it down timewise

Thanks for the great info Pat!

I'm gonna win that lowest hp award!!! I'm in if the transmission swap is complete by then, just so I will learn about my car a bit more. :)

Rocket Rally = Subie Love

agreed.
Thanks for the FAQ Pat, turbo Subarus have a learning curve much different than turbo Hondas, and a much smarter ecu.

count me in for this.
I'd love to get a baseline before going big turbo.