Welcome to the North American Subaru Impreza Owners Club Wednesday October 1, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC General > Proven Power Bragging

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 01-24-2010, 02:01 PM   #1
mudbug
Scooby Specialist
 
Member#: 218867
Join Date: Jul 2009
Location: Montréal, Québec, Canada
Vehicle:
1999 impreza brighto
white

Default V7 vs V8 dyno chart

Hi,

Does somebody has stock comparison of V7 and V8 dyno charts. Preferably same dyno, same day.

Thanks

Pascal
* Registered users of the site do not see these ads.
mudbug is offline   Reply With Quote
Old 01-25-2010, 11:55 AM   #2
Phatron
Scooby Guru
 
Member#: 36033
Join Date: Apr 2003
Chapter/Region: SCIC
Location: Tuning Lab
Vehicle:
CEO PhatBottiTuning
2006 STi GTX3582 + Meth

Default

not too many overseas folks chime in here.

a v7 vs v8 on the dyno on the same day in the US has probably never happened.
Phatron is online now   Reply With Quote
Old 01-25-2010, 12:43 PM   #3
mudbug
Scooby Specialist
 
Member#: 218867
Join Date: Jul 2009
Location: Montréal, Québec, Canada
Vehicle:
1999 impreza brighto
white

Default

Oh!!! Thanks for the info. I think the JDM market in stronger in Canada.
mudbug is offline   Reply With Quote
Old 01-25-2010, 01:02 PM   #4
fourmicah
Scooby Specialist
 
Member#: 128760
Join Date: Oct 2006
Chapter/Region: RMIC
Location: Over there>
Vehicle:
2012 Ruckus/WRX
Red&White/Gray

Default

Ya, sorry, but it sounds like a needle in a haystack search for the US
fourmicah is offline   Reply With Quote
Old 01-25-2010, 01:49 PM   #5
kayen
Scooby Specialist
 
Member#: 57287
Join Date: Mar 2004
Chapter/Region: MWSOC
Location: Kalamazoo, MI
Vehicle:
2002 Bugeye STi
MY03 Fozzy XS

Default

You might be able to find some information over at ScoobyNet
kayen is offline   Reply With Quote
Old 01-25-2010, 02:02 PM   #6
Phatron
Scooby Guru
 
Member#: 36033
Join Date: Apr 2003
Chapter/Region: SCIC
Location: Tuning Lab
Vehicle:
CEO PhatBottiTuning
2006 STi GTX3582 + Meth

Default

I have logs of a stock s203 and a stock s204 i think......

i could plot them up and give you a road dyno comparison. if i can find them. not sure if s203 = v7 and s204 = v8 though.
Phatron is online now   Reply With Quote
Old 01-25-2010, 02:19 PM   #7
kayen
Scooby Specialist
 
Member#: 57287
Join Date: Mar 2004
Chapter/Region: MWSOC
Location: Kalamazoo, MI
Vehicle:
2002 Bugeye STi
MY03 Fozzy XS

Default

Quote:
Originally Posted by Phatron View Post
I have logs of a stock s203 and a stock s204 i think......

i could plot them up and give you a road dyno comparison. if i can find them. not sure if s203 = v7 and s204 = v8 though.
S203 = v8 Blob Eye and S204 = v9 Hawk Eye

S202 = v7 Bugeye

I almost think he wants to see the difference between the Single Scroll vs. Twin Scroll, but I could be wrong.
kayen is offline   Reply With Quote
Old 01-25-2010, 05:58 PM   #8
scoobystas
Scooby Specialist
 
Member#: 26568
Join Date: Oct 2002
Chapter/Region: NESIC
Location: Brighton, Mass
Vehicle:
2003 Yellow Bugeye
Version 8-Vf37

Default

i can post a dyno plot of a stock v8 motor tuned to about 18lbs of boost, its really nothing to write home about. just search my name, i started a thread on this in proven power forum i think. From all the vf39 and vf34 plots i've seen, my car does not spool quicker, and i believe that is pretty much the general consensus here on nasioc. This is with functional avcs btw.

Last edited by scoobystas; 01-25-2010 at 06:08 PM.
scoobystas is offline   Reply With Quote
Old 01-25-2010, 06:08 PM   #9
Fierysun
Scooby Specialist
 
Member#: 82745
Join Date: Mar 2005
Chapter/Region: SCIC
Location: So Cal
Vehicle:
2005 Subaru STI
2003 WRX Wagon

Default

Isn't the v8 single scroll, while the v7 was twin scroll?
Fierysun is offline   Reply With Quote
Old 01-25-2010, 06:10 PM   #10
scoobystas
Scooby Specialist
 
Member#: 26568
Join Date: Oct 2002
Chapter/Region: NESIC
Location: Brighton, Mass
Vehicle:
2003 Yellow Bugeye
Version 8-Vf37

Default

other way around
scoobystas is offline   Reply With Quote
Old 01-25-2010, 07:17 PM   #11
mudbug
Scooby Specialist
 
Member#: 218867
Join Date: Jul 2009
Location: Montréal, Québec, Canada
Vehicle:
1999 impreza brighto
white

Default

From what I heard since the V8 twinscroll came out, the V7 is stronger than the V8 at high rpm. I only want to confirm or not this fact. Also if it's true I would like to find out why since the V8 has better heads and is almost the same as the V7 everywhere else except for the compression ratio...

Stock charts would be easier to compare than modded cars since all the parameters need to be the same.

thanks guys
mudbug is offline   Reply With Quote
Old 01-25-2010, 08:02 PM   #12
scoobystas
Scooby Specialist
 
Member#: 26568
Join Date: Oct 2002
Chapter/Region: NESIC
Location: Brighton, Mass
Vehicle:
2003 Yellow Bugeye
Version 8-Vf37

Default

might be that the twinscroll is outflowed up top by a single scroll turbo. From what i've noticed of dyno plots between twinscroll and single scroll turbos, is that a twinscroll drops alot more torque to redline than a single scroll turbo.

the engines have no real differences other than the v8 runs a tid bit more compression and cast pistons vs. forged on the v7 motor.

most of the differences will be with the turbo and tune.

http://forums.nasioc.com/forums/show...highlight=vf39 this is a v39 that looks really good up top and doesn't drop much torque.

http://forums.nasioc.com/forums/show....php?t=1848754 this is my setup.

the dynos are the same but could be using different correction factors and obviously the atmospheric conditions are different

now that i look at it, my car does spool quicker. i'm at 175lbs of torque by 3480 while the other car is at about 130lbs. But, the runs could have started at different rpm speeds and thus the load could have been different.

anyways i know this isn't exactly what your looking for but hopefully it helps, somehow

Last edited by scoobystas; 01-25-2010 at 08:45 PM.
scoobystas is offline   Reply With Quote
Old 01-26-2010, 08:18 AM   #13
Mecka20000
Scooby Specialist
 
Member#: 176162
Join Date: Mar 2008
Chapter/Region: SCIC
Location: South Torrance, CA
Vehicle:
MY02 Jesus Once Told
Me, "Numbers Sell"......

Default

IDK if this will help but, heres my old setup info.... A 2002 WRX v6 Ra gears 4th gear pull on my stock MY02 EJ207DW4CR V7 i made 280whp @ 18psi w/ PE1818 (modified VF-22 turbo) at Harmen Motive in 2007 Mustang Dyno (Dyno Cell). HyperflowFMIC, 850cc Inj (Modified inj), Walbro FP, Ecutek tuned. Helix Ver1 DP, Cutout Open, 91Octane, 11 AFR, 65degree dyno temps. I have the dyno chart on paper, but no scanner.
Mecka20000 is offline   Reply With Quote
Old 02-03-2010, 02:49 AM   #14
mudbug
Scooby Specialist
 
Member#: 218867
Join Date: Jul 2009
Location: Montréal, Québec, Canada
Vehicle:
1999 impreza brighto
white

Default

I found 3 graphs here in Quebec coming from the same dyno.


V7, Ecutek, 91 octane, headers stock, uppipe lachute, downpipe lachute, midpipe WRX 2004, axleback STI



V8, Ecutek, 94 octane, stock sti exhaust



V8, stock, 94 octane, 3 inch catback


What is strange here is the difference in spool up between the two V8 setup

thanks

Pascal
mudbug is offline   Reply With Quote
Old 02-03-2010, 02:55 AM   #15
Phatron
Scooby Guru
 
Member#: 36033
Join Date: Apr 2003
Chapter/Region: SCIC
Location: Tuning Lab
Vehicle:
CEO PhatBottiTuning
2006 STi GTX3582 + Meth

Default

the stock exhaust made more power than the other 2
Phatron is online now   Reply With Quote
Old 02-03-2010, 12:30 PM   #16
zeropsi
*** Banned ***
 
Member#: 175453
Join Date: Mar 2008
Chapter/Region: MWSOC
Location: wilCO, IL
Vehicle:
AE86 GT-S coupe
i <3 alqonquin homosauce

Default

Just thought of something else. The V7 Spec C heads have big ports, just like the V8, but the V8 not only has the big ports, but also the oversized valves...not sure if it'd make a big difference in stock form...but modified I'd imagine it shows up somehow.
zeropsi is offline   Reply With Quote
Old 02-03-2010, 01:20 PM   #17
N8WRX
Scooby Specialist
 
Member#: 99395
Join Date: Oct 2005
Chapter/Region: NESIC
Location: Maine
Vehicle:
2008 Legacy Spec. B
Quartz Silver Metallic

Default

Quote:
Originally Posted by zeropsi View Post
Just thought of something else. The V7 Spec C heads have big ports, just like the V8, but the V8 not only has the big ports, but also the oversized valves...not sure if it'd make a big difference in stock form...but modified I'd imagine it shows up somehow.
actually ALL ej207 from JAPAN only had big port head castings, spec C's have a few extras as well as hand PNP (thanks to Clark for this information in the heads thread)
N8WRX is offline   Reply With Quote
Old 02-03-2010, 02:52 PM   #18
Clark Turner
NASIOC Vendor
 
Member#: 178047
Join Date: Apr 2008
Chapter/Region: SWIC
Location: AZ
Vehicle:
02 WRX STI Spec C
Black

Default

I have tuned many many many V7s v8s and v8 twin scrolls. They make around the same power. The Twin scroll does have a slightly wider power band on the TRQ curve.

The Power difference in V7 and V8 single strong is simple. The V7 cams are weak. The V7 RA has the better cams and the V8's came with the V7 RA cam style. So off the bat, The V8 is going to be a bit better then the standard V7.

Clark
Clark Turner is offline   Reply With Quote
Old 02-03-2010, 02:59 PM   #19
N8WRX
Scooby Specialist
 
Member#: 99395
Join Date: Oct 2005
Chapter/Region: NESIC
Location: Maine
Vehicle:
2008 Legacy Spec. B
Quartz Silver Metallic

Default

not to thread jack but Clark do you have any detailed info on the cams of the different versions? im looking for a cheap upgrade from my stock v7 cams and was thinking the v8 spec c's but i haven't been able to find much info on any of the jdm cam sets.
N8WRX is offline   Reply With Quote
Old 02-03-2010, 03:13 PM   #20
Clark Turner
NASIOC Vendor
 
Member#: 178047
Join Date: Apr 2008
Chapter/Region: SWIC
Location: AZ
Vehicle:
02 WRX STI Spec C
Black

Default

Its documented on Nasioc here. Search for the old CAM or JDM head threads. The specs of all of them are listed. Jeff even measured some of them.

Clark
Clark Turner is offline   Reply With Quote
Old 02-03-2010, 10:26 PM   #21
seanathanq83
Scooby Guru
 
Member#: 173241
Join Date: Feb 2008
Chapter/Region: TXIC
Location: Houston, Tx
Vehicle:
2002 s256 twinscroll
now with one more gear

Default

i am running a Ver8 VF37 on both my car and my friends, as compared to the VF39 I ran before the 37 seems to spool alot quicker, and seems to be such a smoother daily driver I can make 15psi by 3k in 3rd gear, I do have the complete Ver8 motor that i am rebuilding and will be putting all back together basicly stock except for it will be higher compression than stock, and have forged pistons
seanathanq83 is offline   Reply With Quote
Old 02-06-2010, 06:19 PM   #22
scoobystas
Scooby Specialist
 
Member#: 26568
Join Date: Oct 2002
Chapter/Region: NESIC
Location: Brighton, Mass
Vehicle:
2003 Yellow Bugeye
Version 8-Vf37

Default

sean,

your making 15psi by 3k on the ver8 w/avcs or with an ej205 and no avcs? you got me beat by 200rpm, i'm making 12ish at 3k and 15 at 3200rpm. we're gonna have to discuss on how I can increase my spool by 200 rpm, lol.
scoobystas is offline   Reply With Quote
Old 02-06-2010, 10:53 PM   #23
seanathanq83
Scooby Guru
 
Member#: 173241
Join Date: Feb 2008
Chapter/Region: TXIC
Location: Houston, Tx
Vehicle:
2002 s256 twinscroll
now with one more gear

Default

this is on a stock ej205 with 120k, PM me and i can tell you what i got, and see if i can help you
seanathanq83 is offline   Reply With Quote
Old 02-11-2010, 04:00 PM   #24
bhluv
Scooby Newbie
 
Member#: 167488
Join Date: Dec 2007
Vehicle:
'02 wrx v8 EJ207
aw

Default

Quote:
Originally Posted by Clark Turner View Post
I have tuned many many many V7s v8s and v8 twin scrolls. They make around the same power. The Twin scroll does have a slightly wider power band on the TRQ curve.

The Power difference in V7 and V8 single strong is simple. The V7 cams are weak. The V7 RA has the better cams and the V8's came with the V7 RA cam style. So off the bat, The V8 is going to be a bit better then the standard V7.

Clark
I have v8 ej207 w/ vf30, only got full boost 18psi @ 4200ish rpm in 2nd gear.
Is it a late spool?
bhluv is offline   Reply With Quote
Old 02-11-2010, 04:05 PM   #25
Phatron
Scooby Guru
 
Member#: 36033
Join Date: Apr 2003
Chapter/Region: SCIC
Location: Tuning Lab
Vehicle:
CEO PhatBottiTuning
2006 STi GTX3582 + Meth

Default

^^ 5spd or 6?

most dynos on the 5 spd are done in 3rd gear.......4th gear for the 6 speed.

easier to compare if u know your spool in those gears.
Phatron is online now   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Looking for 2008 STi STU vs. Stock Dynos Charts scorpokat3 Impreza Forum 2 07-10-2008 02:53 PM
V7 vs V8 questions?? 2000wrx Factory 2.0L Turbo Powertrain 6 07-30-2004 07:51 AM
JDM V7 vs V8 Suspension Dong9mong Brakes, Steering & Suspension 7 07-08-2004 12:47 PM
JDM V7 vs. V8, AVCS hookup questions dwx Factory 2.0L Turbo Powertrain 6 10-25-2003 03:26 PM
RS-T vs RS/WRX Stock conversion Dyno Charts christoph1371 Normally Aspirated with bolt-on Forced Induction Powertrain 15 07-02-2002 02:57 AM


All times are GMT -4. The time now is 06:25 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.