SPT Power Pack: Fact or Fiction??

Well I've decided that I'd like to put Subarus claim of 45 hp and 24 lb-ft of torque (interpolated crank horsepower as tested on a Dynapack) for the SPT Power Pack on an 06 STi to the test. I mainly decided to do this because of a thread on IWSTI so I'll be posting the same results there as well.

The facts:
2006 STi w/ 2200 miles. 100% stock. Gas being used is BP 92 octane with NO ethanol.

The Parts:
After my stock run I will add all the parts in the SPT Power Pack to my car. This includes the intake, heatshield and catback exhaust

The Process:
I will be using a Mustang Dyno at RS Motorsports and doing 4th gear pulls. The night before each dyno session I will reset my ECU and do the Vishnu Reset. This will also give my ECU one day to learn anything else needed. The first dyno session was held today. The second will hopefully be held on Tuesday or Wednesday.

 

The results:

Stock run:

Outside temp was 33 degrees. I have no actual data on what the humidity was there (80% according to weather.com).

251hp / 255tq (corrected).

 

my $$$ is on the hp power claims being bogus..... but after you dyno and everything... you should bring the results to subaru and ask them "WTF?!!??"

I'm sure there's plenty of people out there who are interested in just how much HP it does add... make sure to throw dyno charts up on nasioc.

 

Do you have a AWHP/AWTQ graph too?

 

Is that not what that is? I'm new to AWD so I'm a little slow...

 

shane the mustang at RS is a AWD dyno.... i guess im confused about what your asking for too..

 

those numbers seem pretty impressive for stock. dont they usually dyno at 230?

 

Yeah, Ron said that STi's dyno around 225-230 at his shop... then asked me over and over if it was stock.

 

^ That is impressive for a completely stock STi 220...Maybe u broke it in real good!?! =)

 

Isn't that Graph "corrected" for drivetrain loss, to get crank HP?
i say that because it says "Engine Tq" and "Engine Power" on the top....
i figured the numbers seemed high for that dyno to be "Wheel" horsepower.

 

No, it's corrected for atmospheric differences and are wheel numbers. My raw numbers were 263HP and 267Tq.

We'll see how these numbers stack up early next week when I go back. The weather conditions are supposed to be similar Tuesday as they were Friday so I'm going to try and get in then.

I'm more interested in the difference between my stock run and the run with the SPT Power Pack then the original numbers alone.

 

THEY DONT CLAIM 45WHP people!!!!

 

Who said wheel? I said crank and that's exactly what they claim for the 2006 STi.

From a SPT rep (jacked from IWSTI):

 

i was more responding more to always negative nancy shane86

 

Oh, gotcha. I'm just interested in putting all this SPT stuff to bed. Does it work? Doesn't it? Lot's of speculation but no facts other then the disputed ones from SPT.

 

be my guest, i love selling the stuff, so this may help LOL

 

Hoping it will!

 

spt power pack

after you run with it for a bit, why don't you post if there was any effect on your gas mileage.

Thanks

 

Me keeping it will depend on the results of the next session. I will tell you that I had just the intake and heat shield on for two weeks prior and I lost about 2MPG. It also felt like a lost a good bit of torque down low. The car did spool faster though.

 

u probably lost mpg because u wanted to hear your intake more.....

 

Haha. No. I wasn't a huge fan of the increased sound and didn't get on it just to hear it.

 

I can tell you flat out, my mpg went down hard after simply installing the intake and exhaust on the 06 sti... however.. once the downpipe was installed mpg went up. I figure all wil be restored after propper tuning in a day or so... will let you know.

 

if its not staying on when the engine is starting its just your imagination

 

plan on selling the spt catback =D?

 

Ah yeah I reccomend either the free autozone cel scanner (stop at a store they will scan it for free) or the open ecu cable and free software for around $100.

 

I drove with the spt exhaust/ intake for about 2 months.. you WILL see a drop in mpg. however, my dp assumption is definatly not acurate as I've been babying the car... the EM happens today or tomorrow.

 

It is still hard for me to believe the numbers they accomplished on the 06 STi

 

They being RS or they being SPT?

I'll be pissed if I go in and dyno 225hp. Think they'll give me a refund for the first session? :laugh:

 

Well if you think about it 45 chp probably only equates to about 15 whp, barely noticable

 

SPT...

 

Isn't it usually 30% less to WHP compared to CHP? I'm guess'in 30WHP = 45chp

 

Assuming it is a dymanic loss and not static. That argument is as old as the web.... My view? It is somewhere in between 0% and whatever the delta between crank and wheel when it was tested originally (a dimishing returns sort of dynamic). I don't believe all the components still absorb the same amount of power as it goes up.... For example, it only takes so much to overcome static friction, once you start to move there is no more static friction, it changes to dynamic friction and the loss is less than it is for static.

 

something makes me think the dyno operators really dont care hoe much whp you get enough to do refunds for people whos cars dont get the numebrs they want. They're also under pressure fromt heir customers to produce the largest numbers possible and can futz things around to make it appear that way with pushy customers, depending on what dyno etc.

225hp is common for an STi. i don't see why its anything to get upset about, its average. A cold air intake doesn't add a lot of HP, I dont know why everyone just started down that hill like 5 years ago.

 

You must have missed my stock run of 251. What I was getting at is I'd be upset if I read lower this time around (lost hp).

 

Yeah, I would almost run with the SPT parts, then take them off and do yet another run. With a baseline that high, it is going to put the results in question regardless of what you come up with.

Sorry if this is an ignorant question (have not been on a dyno before) - but are you blowing a big-@ss fan on the car when you run? The SPT intake temps shoot way up at a standstill, with or without the heatshield.

If you end up not keeping the catback, I may be interested in buying some dyno time and trying the same thing with my '05. Already have the intake.

 

They put a fan on top of the TMIC, yes.

Unless I come up with some wacky numbers next run then doing another stock pull is out of the question. I'd like to know real world gains but I'm not going crazy trying to get all the variables nailed down. This is coming out of my pocket after all.

I'm still waiting for the cb to come in. I'll know if I want to keep it or not after I drive with it for a few days and get some real numbers from RS.

 

Update on the Cat-Backs....... Bosal couldn't keep up with the demand from the release of the "Power Pack" and now subaru is waiting for the exhaust to get back in stock at all the warehouses. When I talked to Subaru on Tuesday, I was told sometime early January.

*****SORRY Guys******

Webcrawlr call me tomorrow at 4ish, and I may have another option for you.

 

I have it all installed on my scuby.. I should get mine on the dyno...
But Ireally don't care THAT much about it to know my exact hp / trq

 

Thanks for taking car of me Brian, I owe ya some beers!

Skarecrow, if you want to go in at the same time let me know. I'm thinking Thursday/Friday right now.

 

I can't afford a dyno right now... especially when all the cashflow I have is dumping into christmas shizzle. Would be nice tho, cuz then I would know what the ap v2's new stage 2 map would be putting down.

 

Well results from the runs after the SPT Power Pack don't look good at all. I don't have a scanner at home so I can't post the graph yet but HP and Tq were down 20/25 respectively, boost came up slower and my a/f raito was richer. I'm not sure if this has anything to do with my car being a "freak" or not. I did ask again what stock STi's pull there and he said 215-220 so either my car was built well or my stock run was off for some reason. Ron seems to think the stock run was fine though and that the intake is what's throwing things off.

I planned on selling everything no matter what the results as the SPT stuff was too loud for me. I'd like to follow a mod path that doesn't up in cabin noise. So, I'm pulling the cat-back, intake and heat shield off tonight and going back to RS tomorrow for another stock run. I might just for fun put the SPT intake on after my stock pulls to see what happens since I can do that in about 15 minutes.

Anyone have any ideas on such a bad drop in power? You think it was because my car was running so well before or just not tuned for the intake? It's funny because many people say they've felt gains with the power pack but I have no actual data on what the before/after picture was like so it's hard to tell if it's just my car not liking the mods or if it's all the STi's in general. Then again, Cobb was able to pull power out of the intake with a dyno tune on a stage 2 STi...

To be continued....