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Old 01-24-2010, 02:01 PM   #1
mudbug
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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
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Old 01-25-2010, 11:55 AM   #2
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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.
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Old 01-25-2010, 12:43 PM   #3
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Oh!!! Thanks for the info. I think the JDM market in stronger in Canada.
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Old 01-25-2010, 01:02 PM   #4
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Ya, sorry, but it sounds like a needle in a haystack search for the US
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Old 01-25-2010, 01:49 PM   #5
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You might be able to find some information over at ScoobyNet
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Old 01-25-2010, 02:02 PM   #6
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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.
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Old 01-25-2010, 02:19 PM   #7
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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.
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Old 01-25-2010, 05:58 PM   #8
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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.
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Old 01-25-2010, 06:08 PM   #9
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Isn't the v8 single scroll, while the v7 was twin scroll?
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Old 01-25-2010, 06:10 PM   #10
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other way around
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Old 01-25-2010, 07:17 PM   #11
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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
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Old 01-25-2010, 08:02 PM   #12
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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.
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Old 01-26-2010, 08:18 AM   #13
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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.
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Old 02-03-2010, 02:49 AM   #14
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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
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Old 02-03-2010, 02:55 AM   #15
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the stock exhaust made more power than the other 2
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Old 02-03-2010, 12:30 PM   #16
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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.
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Old 02-03-2010, 01:20 PM   #17
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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)
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Old 02-03-2010, 02:52 PM   #18
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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
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Old 02-03-2010, 02:59 PM   #19
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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.
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Old 02-03-2010, 03:13 PM   #20
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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
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Old 02-03-2010, 10:26 PM   #21
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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
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Old 02-06-2010, 06:19 PM   #22
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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.
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Old 02-06-2010, 10:53 PM   #23
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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
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Old 02-11-2010, 04:00 PM   #24
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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?
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Old 02-11-2010, 04:05 PM   #25
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^^ 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.
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