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Old 05-19-2009, 07:55 PM   #1
PCSkiBum_21
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Default Cobb Mustang Dyno - 2.0 liter Dom III

Hey guys,

I recently made a few changes to my car that have been pretty exciting..

Mods:
Blouch Dom III, 3" inlet
APS DR525 FMIC and intake
Aquamist HFS-5
-80% meth / 20% water mixture
DW 740cc injectors
Prodrive 3-port BCS
Walbro 255
TGV Deletes
P&P stock ex. manifold
Grimmspeed Up
Tial 44mm EWG
Cobb TBE (fully catless)

Tuned on pump 91 oct + water/meth
24 peak psi
355whp
303wtq

Stock EJ205 block and heads.
(hybrid EJ257 with cams/valves/springs and a built trans are in the future)

Sorry the dyno sheet is difficult to read.



Many thanks goes out to John at Cobb for sticking with me over all the time to get everything working properly finally. I had alot of support from Paul and Noah at Solid Autoworks. Of course Nasioc too!

-Brendon
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Old 05-19-2009, 08:00 PM   #2
rpeirats
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holy lag! i WAS thinking of going dom3, but looking at this, it would make a terrible daily driver

that aside, those are GREAT results! that should get you in the 11's easily...
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Old 05-19-2009, 08:06 PM   #3
PCSkiBum_21
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haha yes.. very laggy on the 2.0 liter. it was alot quicker to spool when i had boost down around 18 pounds but to get 24 i had to sacrifice a little. i daily drive this car to work about 40 miles one way 5 days a week and i have no complaints. if anything it keeps me in line because 5th gear on the freeway i have no power

it's only a downshift away though.

i love this car at the track also. i really never notice the lag because i'm always upwards of 4500rpm pretty much the whole time. it's a monster down the straights and the ewg is to die for
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Old 05-19-2009, 08:17 PM   #4
jpwrxtr06
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DOM3backoff i'mascientist

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Quote:
Originally Posted by rpeirats View Post
holy lag! i WAS thinking of going dom3, but looking at this, it would make a terrible daily driver

that aside, those are GREAT results! that should get you in the 11's easily...
your not gonna see that much lag with a 2.5 and remember he has a front mount too so it's gonna show more but good numbers. I love my Dom 3
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Old 05-19-2009, 08:45 PM   #5
PCSkiBum_21
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^ he has an 05 also, 2 liter same as me
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Old 05-19-2009, 08:55 PM   #6
Steve.804
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The lag dosnt seem to be that bad. If you're expecting to punch it at 3k and be pinned in the seat, then yeah its laggy but considering the power it's making I think it would be worth the wait. Cobb's Mustang dyno reads pretty low so this would be much closer to 400awhp on a typical Dynojet.

Best turbo IMO for a daily driven 2.0 with some good top end and good spool characteristics would be an 18G 8cm^2...but you wont be making this kind of power
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Old 05-19-2009, 09:00 PM   #7
jpwrxtr06
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Quote:
Originally Posted by PCSkiBum_21 View Post
^ he has an 05 also, 2 liter same as me
My bad I was typing from my phone. I went with an Aps tmic to help avoid lag I have yet to get it on the dyno but so far I don't notice any
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Old 05-19-2009, 09:12 PM   #8
PCSkiBum_21
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steve i want to put my car on a dynojet just one run to see what it does haha.

i have a friend with an 05 sti w/dom 3 and aps top mount. on 100 octane plus meth he made 400whp/400wtq on this same dyno. 26 pounds and his spool was much quicker than mine.
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Old 05-19-2009, 11:18 PM   #9
Phatron
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Quote:
Originally Posted by rpeirats View Post
that aside, those are GREAT results! that should get you in the 11's easily...
i dont know about easily.....

with the long gearing of the 5 speed he's gonna drop way back to 4500-5000rpm when he shifts at redline.....and gonna be outta boost, unless he's using FFS.
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Old 05-20-2009, 12:06 AM   #10
PCSkiBum_21
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no ffs, it's not available on the older wrx access port. when i shift at redline (7500) i stay in full boost at the start of the next gear. but i'm not into drag anyway so i don't know how it would do there.. i like turning more haha.
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Old 05-20-2009, 02:47 AM   #11
PikkaGTR
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very nice numbers
good tq for a 2.0l block as well
im sure it's fun on teh streets
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Old 05-21-2009, 12:46 AM   #12
jmlaser
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1/4 mi stock block record

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I agree with Phatron,..
His times will actually suffer because of boost lost during shifts,....
Powerband being narrow makes the car HARDER to drive consistently in the 1/4.....
Made a real nice # FWIW
I need to start a sub>12 second 2.0L thread so we can see where these all line up->
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Old 05-21-2009, 12:56 AM   #13
Phatron
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with the 5 speed the rpms drop ~3000 rpm so you want your peak hp to be ~1500 rpm from redline.

with the 6 speed the rpms drop ~2000 rpm so you want your peak hp to be ~1000 rpm from redline.

the closer your hp peaks to redline, the more power you're wasting in the lower gears.

For example, if this car had a 8000rpm redline the powerband would be more useful.

When you're tranny breaks you should get a 6 speed, unless you're gonna drag then a ppg box is better.

this car will feel 100x faster with the 6 speed. I went from a 2.2L with 60 lb/min turbo on a 5 speed, to a 56 lb/min turbo on a 6 speed and the difference is night and day. the 5 speed was a horribly laggy daily driver.......the 6 speed is much better for bigger turbos.
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Old 05-21-2009, 01:44 AM   #14
PCSkiBum_21
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i'd love to do a 6 speed swap when it goes, but ppg will actually be cheaper and alot easier. if i did the sti i'd also want axles/hubs/dccd.. the whole deal. but... we'll see how long this trans will hold and where i am financially haha.
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Old 05-21-2009, 02:09 AM   #15
Phatron
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i did mine for $3500 from millenium auto hear on nasioc. you get the 6 speed, shifter, sti driveshaft, and a r160 with a flange to except the sti driveshaft and the 3.90 gears in teh r160.

i priced them out many times and the 6 speed is cheaper......that is unless you're doing axles, hubs and brembos....which isnt really necessary.
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Old 05-21-2009, 02:17 AM   #16
PCSkiBum_21
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i've got the cobb 332mm bbk front and cobb 328 bbk rear already, but i'm also a wagon and my axles are narrower which is why i'd like to do a full sti swap with everything, but if i do 04 sti stuff i can keep my brakes/wheels
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Old 05-21-2009, 02:24 AM   #17
Iflysti06
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Quote:
Originally Posted by rpeirats View Post
holy lag! i WAS thinking of going dom3, but looking at this, it would make a terrible daily driver

that aside, those are GREAT results! that should get you in the 11's easily...

I daily drive my 3582r and never regret to this day about going rotated and having it installed on my daily driven STI. So different strokes for different folks I suppose!
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Old 05-21-2009, 02:25 AM   #18
STi Mikey
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Quote:
Originally Posted by PCSkiBum_21 View Post
i've got the cobb 332mm bbk front and cobb 328 bbk rear already, but i'm also a wagon and my axles are narrower which is why i'd like to do a full sti swap with everything, but if i do 04 sti stuff i can keep my brakes/wheels
The 6 speed as you knnow is a great trans once you break the 300whp mark in a rex. Please be aware, that while being "bulletproof" if you get an 04 or early 05 trans they are prone to small problems which cost $$$$

In late 05 the subaru made changes to the 4th , 5th, and 6th gear synchros (i believe material change).

I miss-shifted once in my 04 STi and the car ground every shift after. Of course I still tracked it that way, but then missed fifth 2 or 3 times in one day and that was destroyed. If your not a drag racer, you probably wont have to worry, but figured I would make you aware before you invest 3-5grand.
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Old 05-21-2009, 03:30 AM   #19
PCSkiBum_21
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yeah good advice for sure. iirc they changed trans syncros in 07 though? i had an 04 sti before and i don't know what everyone complains about the short gears and having to shift frequently.. i liked it. maybe also why i will never buy an automatic vehicle in my life lol.

but i also don't doubt that it would be faster essentially even with the extra shift because i can get to the higher rpm's quicker since it doesn't spool until so late. i plan on doing transmission work before i do any further power mods.. but like i said, playing it by year and hopefully it will hold long enough for me to do whatever i want.
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Old 05-21-2009, 03:31 AM   #20
STimo
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Quote:
Originally Posted by Iflysti06 View Post
I daily drive my 3582r and never regret to this day about going rotated and having it installed on my daily driven STI. So different strokes for different folks I suppose!
i agree 110%.. I was all worried about my 30R being laggy before i got it, but once i drove around in it its not laggy AT ALL.. Of course i dont try and floor it at 3K and think im fgoing to take off, all the power is just a downshift away and then the power is instant.. Makes me almost wish i went with a 35R.. #0R tho is plenty for the stock block tho, so far its holding well though, its holding everything i can throw at it..
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