GrimmSpeed Project Impreza L/WRX Dynos

Yeah, it's a pretty sweet application. From what I've seen firsthand, it has been very consistant back when I used to use it. The main thing is that you need to take all of your logs on the exact same stretch of road every time.

 

yeah i agree. did some partial stg2 logging today(tbe, no up pipe)(will post info when i'm done messing around with it) but i found a better road to do it before and my results are a bit different than expected(due to using two different "flat" roads). i'll be using this new found perfectly flat and straight stretch of road from here on out. i'll be using the exact same starting spot on this road everytime as well.

 

Yeah, this is important. Also, if getting "accurate" dyno numbers (IE; comparable to real world dyno's), make sure your CD and frontal area values are correct. Obviously, correct wheel size is important as well.

For reference, my stage 2 '06 WRX (catted TBE and GMBCS) makes on average 315wtq/245whp using this application.

 

Yeah, but you said you needed to tweak after every fill-up. That's a high-maintenance power adder.

 

Did you write you own Stage 1 map, or did you get it from someplace. I ask because I will be needing one soon.

 

it was from scratch.

 

Sorry guys i made a mistake with the stock vs. stg1 graph. i had the weights wrong for my car. i thought my tuner was in the car for the log i was using but he was not. The numbers seemed a bit high to me originally which is why i was investigating.

We still made 16hp and 17tq which i think is pretty good.

I've updated the first post with the correct info.

Justin

 

lmao that shouldn't matter -- both of you two together weigh about 100 lbs combined.

 

:O ......so the car is up and running eh? we should compare! wrx or svx?!?!?! hahah well glad to hear that its up and running!

 

har har

what did you dyno at?

 

welll...i haven't dyno yet...but we did compare my car to a stage 2 STI..and we managed to stay with it up to about 110mph...from a 40!...but if he wasn't to brake boost..then i would have jumped at least a car ahead....but im trying to get a dyno soon...once i fix it a bit more...just on maintance

 

dont talk about street racing, you can get in trouble now.:ugh:

 

closed course :ugh:

 

well then in that case, 110 is pathetic

 

When is the annuel review coming up, I think its time mr. Nukey to a raise/bonus if he hasn't already! LOL

Great post guys from GrimmSpeed, I'm interested in reading more about your R&D.

 

so i got the TBE exhaust on this past week and did some tuning. i'm not sure what brand the downpipe is, but the catback is megan racing(not my first choice but it was laying in the shop).

i finally got a new wideband too so i could see what was up with the fuel. it was running a bit rich. it was around mid-high 9s

So here is the stock w/ tune VS TBE w/tune graph. Again, using on same road as before, nice perfectly flat road by a corn field. Gains were 13HP and 27TQ. the hp number is what i expected but that tq number really jumped up alot more than expected.




I have some 750cc injectors coming that i'm putting in soon here too. They arent going to help us now but once we get our ewg kit on then we will really need them for keeping the boost cruising up top. Also our up pipe will be going on next as well w00t.

Justin

 

Stock BCS, I assume? What kind of boost did you see out of it?

 

This is the road dyno program correct Justin/Nate?

 

correct. taken from the same exact starting and ending point on a specific road so you can get an exact comparison. i'm really digging the road dyno software..sooo much easier/cheaper than going to the dyno multiple times a week when you are testing stuff.

 

nate - yeah stock bcs so far. i need to order up a gm here but i keep forgetting. i believe target boost is set at 17.5 but we are only hitting 16.9 or so.

 

Well, that's still pretty dang good on the stock BCS. Most cars I've seen have trouble hitting above 16 PSI on the stocker.

 

Tighten the crap out of the wg arm; problem solved.

 

Does it take in to account the weather?

 

Can you also graph the boost? So you have a comparison of the graph instead of just peak numbers.

 

Yes, it can do SAE correction if you input intake temps and barometric pressure.

 

been doing that, trying to find the sweet spot.

what tom said....and yes i am using it. everytime i data log i come home and write down the atmospheric variables. its pretty easy.

unfortunately the definition isnt written for subarus yet. i just graph the boost in excel.

Justin

 

FYI -- I saw a new definition file somewhere that included boost and AFR. I think it was on NASOIC somewhere...

EDIT: Found it.

 

Well i was hoping today to get a good comparison of the real life gains of adding the GrimmSpeed Up Pipe to your car but i failed...we changed too much at one time and the gains i believe are much more than what the average gains of putting our up pipe on your car would be and i dont want to show gains that wouldnt exist for you guys.

What i did was finally get my wideband hooked up so we could lean it out a bit from being overly rich and i replaced the stock cat'd up pipe with our catless up pipe. Original dyno had an afr of about 9.8:1 and the new one has an afr of 10.8:1.

With the original tune boost hit a peak of 17.0 and with the new tune we are hitting 17.5...so boost was raised a little bit.

I wanted to note a few dynos ago i tightened the wastegate arm a few turns...thats how i'm able to hold this much boost with the stock wastegate. if you are having trouble hitting higher boosts i suggest giving the wastegate arm a couple turns to shorten it up a bit.

Gains are 19hp and 18tq with the leaner tune and adding the grimmspeed up pipe. Because i think these numbers are definitely high for a person that would be just adding an up pipe to a stg2 car i will be taking the up pipe off and putting the stocker back on then taking some more pulls and then hopefully we can get a better comparison of stock up vs. grimmspeed up. But nonetheless this dyno shows the gains of leaning out the tune and adding the up pipe.





The car is definitely opening up a ton. I can easily tell the difference between this 2800lb impreza stg2 w/ tune VS. the 3300lb wrx stg 2 w/tune. Its amazing how much the weight difference really makes.

and on that note i decided to play with the dyno software to see what the dyno would look like if you implanted my exact engine/tune from the 2810lb impreza L and put it in a 3200 WRX. these results are pretty cool imo...i knew weight made a difference but its crazy to see it on paper.



better go hunting for some stg2 wrx's muahhahaha


Justin

 

well, you wont have any problems finding them thats for sure lol

 

The numbers are starting to look better. I'm not really surprised the difference that 400 lbs makes. Weight is everything. Is that 2810lbs counting the driver? That weight makes a difference as well.

 

those numbers for both cars werent including driver but i included my weight in the car when doing dynos. the only moving variable in the equation when i do these different dynos is the amount of gas in the car, however, i always try to take the pulls when i'm around 1/2 tank because thats what was in the car when i put it on the scale.

 

Did you're injector duty go down any with the leaner tune, or did the higher power burn what what would have otherwise been left over?

 

i'm trying to think at what point i switched over the injectors. right now my idc's are super low because we are running the 750cc's now. i believe the rich setup was on the stock injectors, then i got the wideband and put the 750cc's in at the same time and retuned. last time i logged IDC's i believe it was in the 50's max.

 

I'd like to see some work using the speed graph on this page:
http://www.dataloglab.com/

Could be pretty cool, doing the above comparison, and also to see what gains you get from lightened drivetrain components.