NemesisCBR

Got my car dyno'd at a dyno day to have a something to compare with after some future mods. Shouldnt i see a bump up in the curve between 4000-5000 like most Aem cai? I see a tiny bump when the butterflies open up but not sure whether the curve immediately after should look better or not.

99 gsr 180,000 miles AEM cold air.

Wheres my aem cai hump?! -_-

mouab18c1

iTrader: (5)

Looks normal for a GSR

What's the future mods?

NemesisCBR

itr cams going in then full jdm exhaust set up and possibly skunk 2 intake manifold with ecu/tb change followed up with a tune if i go that route. Im back and forth on using the manifold or keeping it stock. Overall just a light street set up.

Why does the torque dip for 500 rpms? I always thought that was where cai made its increase. Whats interesting is that i have been wondering if something about it isnt working as it used to because i realized one day that it doesnt sound like i remember it used to. When it was first installed it had the familiar audible increase after 4k but i dont drive it hard everyday and a long time passed before it occured to me that i wasnt hearing it anymore. The graph backs up the theory that something could be up cuz i thought the cai's always had the improvements right in the midrange.

doood

iTrader: (1)

that's right where vtec crosses over. looks normal to me.

GagnarTheUnruly

iTrader: (3)

It's a good power curve and a decent whp figure for an essentially stock GS-R. Nothing looks out of order to me. The dip you see is VTEC crossover.

If anything this just underlines how good the stock tune is.

NemesisCBR

I was asking more about the dip in torque but i guess i can understand that torque will drop too when vtec is engaging. Also need to remember that it looks worse on paper then it actually is in that short instance. I just figured that the infamous aem hump would have shown itself on paper also but it doesnt really seem to be anywhere on the mid range except mixed in with the vtec. Im considering a blox velocity stack with k&n filter now to replace my old one. The intake pipe also has a cutout im guessing it was for a bypass valve but ive wondered for a long while if that potentially prevented any power gains.

Other then that im aware its pretty healthy for a high mileage motor.

v6secamry

thanks for the dyno

sayanything

iTrader: (1)

^ lol 1st post.

yeah OP, thanks for posting that. i was really curious to see what a stock(plus intake) GSR puts out. its kinda weird seeing that on the freeway the car is only making 75hp cruising at 3500 rpm at 65 mph in 5th.

GagnarTheUnruly

iTrader: (3)

Don't worry about the AEM hump. For all you know it's there, since you can't compare to a pre-AEM dyno.

I recall that the hump happens at IAB crossover. Not that your graph looks bad, but is it possible your secondaries are stuck open? It could explain the lack of a sound change (on a GS-R it's IAB crossover, and not VTEC crossover that's audible).

94VTEC2TONE

what is jdm exhaust?

NemesisCBR

All the reading ive done (past and present) along with previous experience says it happens before the butterflies open, typically between 4-5k. Although i read a thread yesterday where they discussed that the length of the pipe has to do with that "harmonic" and aem designs them this way. I tried to find some other dyno graphs but most were too old to see the image or had many other upgrades. Im not stating fact, just what i think based on research for the purpose of discussion. I appreciate aspects of input. Helps confirm what i know or learn something new.

My butterflies definately work properly. I clearly hear them open up before 6k all the time.

Full jdm exhaust- jdm 4-1, jdm cat, jdm itr b-pipe and muffler.

The sound itself is less of a concern over power but more of a indication that something might be up. However i could dismiss that 'sound' because there was a post from someone else that also heard the intake fairly loud in that same range but also said it stopped doing that after some time. If this is normal it makes me curious what causes it to start off that way then stops later on. My first experience with the aem cai was on my brothers sohc civic in 97 that could be heard very loud just after 4k. Seeing the graph differ from what ive seen of others with the aem just backs up my theory that something might have changed but i have no idea what.

mtflyboy25

iTrader: (2)

Thanks for posting this! I was curious about the numbers of a stock GSR. I have a 98 JDM B18c in my CRX, so I am guessing I will see about 10 more hp at the wheels? Maybe less haha. That torque curve is pretty sexy though. I like that.

NemesisCBR

The jdm b18c is supposed to have around 10 more hp. There was a civic with a jdm gsr motor at the dyno day and he put out 160 on the third pull with some exhaust valve open all the way. He was straight piped with some aftermarket header i think. With some variant in conditions i think you could expect that also if its in good shape.

Ive always wanted to know how good my motor is after so many years and im glad i finally went to a dyno day. Especially right before i add some bolt ons. I would highly recommend finding a local dyno day to hit up. Some other civic there was a 00 Si and put out 113whp so obviously his motor was worn down. Dont think he cared though cuz he put out 255whp with nos.

doood

iTrader: (1)

i make more torque than you do hp. lol but i have a k. :p

my brother made similar numbers with similar mods on his 96 gsr a few years back

geeSarrDc2

i love that a b18c makes just as much power as a k...

TunerN00b

Actually, you'd only be making 75whp under full throttle. It only takes about 20whp for most cars to maintain a 65mph cruise.

doood

iTrader: (1)

what?

NemesisCBR

LoL

iwannarace

Here's another close-to-stock gsr dyno from Monday. Only mods are a generic chipped p72, jdm itr 4-1 and 2.5" cat and catback. I wonder how much a cai would've added...

I've been staring at both graphs for a few minutes now, your setup is making a bit more than my until about 6500rpms... interesting.

Thanks for the post.

NemesisCBR

That makes a good amount of sense because i have the aem which makes more midrange and you the jdm 4-1 with good flowing cat to exhaust makes more top end. More confirmation that the parts work like people say they do.

I'll be expecting much higher gains up top once i do 4-1 and cat + catback also. ITR cams should be going in very soon but i dont think i can justify doing a dyno just for the numbers. I should get 8-10 from it anyway and after i upgrade the exhaust ill put up the money for a dyno if no dyno day pops up in september.

iwannarace

Don't laught at my archaic presentation... I was reely board at work cuz of the three-day weekend so I combined the two graphs.

I thought it would be a neat illustration to see how simple mods affect the curve.

iwannarace

Update:

new dyno... same setup as before but now tuned with an AEM CAI and skunk2 tuner2 cams.

Records

Bump, great topic

jdmgsr98

yeah nice numbers fellas... i think im gunna add a diff header cams and stage 2 clutch to my jdm gsr...ne other good bolt on mods u guy suggest?

NemesisCBR

Funny you guys should post on my thread today. I havent kept up with this since september. Just a guess but i think youll get anywhere from 10-12 on AVG if going from stock. This might be high but im giving the hytech its reputation plus you mention a bit of tuning work. Listing your other mods will be useful.

Coincidentally from today! Type R cams in with full jdm type r exhaust since my last dyno.