modoman

iTrader: (6)

nice ^^^

82801BA

My dyno runs at 4th gear and never run a 3rd gear. So may be that's correct for the number. Gear matters?

WannaBFast

iTrader: (16)

yea, 3rd gear is closer to a 1:1 ratio so its more acurate

IronFist

iTrader: (3)

I thought hp was a function of the engine and gearing wouldn't matter?

WannaBFast

iTrader: (16)

well it does matter.. cause you are going X mph.. and if you notice that after like 80mph.. ur car cant pick up as fast...
same deal

kjgracing

iTrader: (3)

VTEC stays on no matter what after 63 mph.

CapYoda

iTrader: (30)

gearing does matter.. it applies how much from engine is going to wheel...

in different gears your car is going to put out diff. amount of hp.

hence u gotta switch gear to get to higher speed.. well, not really but yeah. lol.

82801BA

I understand that because I study engineering.

Texas Rice

No, you can not sue for honda saying it has a vtec engine but in actuality it uses the vtec-e. The D17a2 is still a vtec engine, its just a different version. All companies do this.

82801BA

At the time I tune the engine, I take a look at the camshaft. From my observation, the camshaft has 4 lobes for each cylinder. 1 for exhaust, 1 regular intake, 1 low profile intake, it also has 1 wide-open intake(the profile is somewhat higher than the regular one). I found the information about VTEC and it says VTEC-E only has 2 lobes for intake. I am not sure how it works out, but after I installed the Injen CAI and AEM pulleys, when VTEC kicks in, the difference can be felt at 2 different points...At around 2600 after the VTEC indicator on, and at 4500 another pull there. So what's the point of this engine?

82801BA

As a follow up(I don't know who will read this, probably no one)

D17A2 is a VTEC-E, concluded.
Here's the comparison between the 2 generation engines:


7th gen

End Play: 0.05-0.15mm
Camshaft-to-holder oil clearance: 0.050-0.089mm
Total Runout: 0.03mm

::: D17A2 Lobe Height :::
VTEC intake primary: 38.604mm
VTEC intake secondary: 32.848mm
VTEC exhaust: 38.784mm

::: D17A6 Lobe Height :::
VTEC intake primary: 38.427mm
VTEC intake secondary: 32.193mm
VTEC exhaust: 38.784mm

::: D17A1 Lobe Height :::
Intake: 35.299mm
Exhaust: 37.281mm


6th gen

::: D16Y8 Lobe Height :::
VTEC intake primary: 36.778mm
VTEC intake secondary: 37.065mm
VTEC mid: 38.274mm
VTEC exhaust: 38.008mm

::: D16Y5 Lobe Height :::
VTEC intake primary: 38.427mm
VTEC intake secondary: 32.193mm
VTEC exhaust: 38.784mm

::: D16Y7 Lobe Height :::
Intake: 35.299mm
Exhaust: 37.281mm

I wonder how come the D17A2 does not outperform D16Y8.
Questions rising here:

Even though D17A2 is VTEC-E, the height of the lobe opens further than D16Y8, but horsepower remains the same? And probably D17A2 is even slower?

Does the low engagement point of the VTEC-E(2500-3300) actually affects performance(If at 4500rpm both D16Y8 and D17A2 should operate the same, with D17A2 having some higher opening as an advantage therotically, when all 16-valves are opened, it should run better than the lower profile D16Y8)?
-The idea is, I had an H-series VTEC before and I tried to kick the VTEC in at 3000 rpm it actually lost all the performance, even at top-end. In another word, the low opening rpm of hi-cam actually causes the engine to respone slower(Acura.com shows the demo to compare tractor and race car, which tractor opens lo and race car opens high all time. You lose torque and horsepower if using high-cam at low rpm) True?

Is the the air/fuel mixture ratio actually playing the trick in D17A2 to lower the performance(if so, then AFC should do some work)?

I am not going to run turbo because I am always driving on highways for 320 mile every week(turbo sucks my money if I add it).

GenRoku

It means its slow. Did you change your VTEC fluid?

-joe

lid6662

Well the d17a2 does make more torque......... then the d16a2

GenRoku

Ahhhh.. but my lug nuts require more torque to spec then either engine produces at the wheels. heh.

lid6662

lol

WannaBFast Was that on ur stock ex???

82801BA

It makes more torque is due to the displacement, but not anything else.

blouisgod

iTrader: (14)

The D17 is essentially a D16, other than a larger crank, headers, ignition, and some little vtec mods. Bottom line...it's a weak engine and needs F/I or to be swapped to be worth something.

82801BA

How come I put I/H and pulley in then the car becomes a little rough(Can't get the car run smoothly as not modified before)? Anyone has this problem?

WannaBFast

iTrader: (16)

it was on my stock ex... well i had a cheap ebay intake and a custom catback... but i had the silencer in...

now with my vafc2 tuned, its closer to 120hp and like 110ft/lbs torque

lid6662

So does having the silencer make a difference at alll? I think it feels the same either way....
Any ideas??
power wise??

82801BA

Can anybody confirm that the V-AFC2 WILL WORK WITH OUR CAR? I am very confused because some saying that it works for '01 only. I have a 03 and the shop tell me(I know the ower for a very long time) that V-AFC2 will NOT work in 03 car. But I see no difference between 01 and 03 therefore not sure.

WannaBFast

iTrader: (16)

it will work with all vtec cars except ones with lean burn...

the silencer helps with the backpressure.. and for most of us, backpressure = torque... if you are boosting, backpressure = bad

but its a 2 fold thing... u get more torque, then theres a restriction for hp

82801BA

But losing torque almost = to losing low end power because torque is what makes the wheel rolling...correct?

cwick187

It works on all the models...You just have to print out these instructions that Fly posted and take it to the shop..Apexi left out a wire hook-up on our instructions for the VTM wire.VAFC II Fix If you already have it hooked up, you should be able to fix it yourself..It's just one wire

WannaBFast

iTrader: (16)

torque is what you feel

ViNRoCk8

iTrader: (2)

When I see dyno charts of our cars I get embarrased, but hey it's not a sports car

WannaBFast

iTrader: (16)

well put

82801BA

I did dyno again last saturday after I installed the Injen RD CAI, DC Ceramic Header, Tru-Power pulleys, and adjusted the cam gear.....Here's what I got.......(@#$%!)
The blue line is the factory cam gear with pulley header and cai
The red one is 2 deg advanced(for 2 deg retard, I get 117hp)
Nothing much changed except 9 hp and 7lb-ft torque gained since my first dyno......

clean2k1civ

the v tec cant be kickin in!!!

WannaBFast

iTrader: (16)

umm yea.. the vtec "kicks in" around 2500rpm's... unless u got a vafc
82801BA's is a good stock looking power curve, but its slightly higher due to the mods...