anx1300c

iTrader: (2)

JuamP made 4-5 whp on his TL-S with the ported runners. That's still more or less within the margin of error for the dyno, so take it for what it's worth.

06NH6MTTL

iTrader: (1)

I think its more hype than anything else but if i had more exhaust mods maybe i would have made more.... but here are the results!!!!!!

Before

After

06NH6MTTL

iTrader: (1)

Only major difference is a drop of 6.28 degrees but the humidity was 23% higher

thisaznboi88

iTrader: (7)

Number might be low because of humidity. Hot + humid = less air getting in to make power

Here a dyno from a gen8 accord coupe
http://www./forums/showthread.php?t=52866

He pulled 14whp/21wtq

"Base Dyno with Catback
WHP- 211
WTQ-189

Dyno with Underdrive pulley installed and CBE
WHP-220
WTQ-209

Dyno with Pulley and CBE and p2r Intake Runners and TB Spacer installed
WHP-234.6
WTQ-230.2"

06NH6MTTL

iTrader: (1)

ya 23% is a lot of heat but my only mods are CAI, port and polished runners, p2r plenum gasket and coolant lines deleted from throttle body

thisaznboi88

iTrader: (7)

I think I miss read your graph. Was this a before and after install? Or was it 2 runs with all the stuff on? I thought you only gain 2hp. lol

was this your before graph?


if so looks like your within the power gain of the gen8 accord

anx1300c

iTrader: (2)

Weather isn't a factor when you're using the same correction factor on the same dyno, as this one did. You can dyno at 30 degrees with low humidity and then again at 100 degrees with high humidity; the numbers will be the same if you're not heat soaked and you're using the same dyno and no changes were made to the car or dyno. A couple hp/tq is realistic for porting the runners. Obviously, opening up the manifold and TB as well will have a better effect.

41 ft lbs of tq on a little J from a pulley, ported runners and a TB spacer is well.....laughable.

Misc-ura

Interesting, I wonder if the supporting mods make a difference. Might hold off on this mod for a little while then.

06NH6MTTL

iTrader: (1)

this is justin's (3gstealths) dyno graph not mine

thisaznboi88

iTrader: (7)

Why is it laughable? the dyno I showed was from a 3.5 motor.

from temple of Vtec stock dyno for AT and MT
http://www.vtec.net/articles/view-ar...icle_id=714997

http://www.vtec.net/articles/view-ar...icle_id=831240

anx1300c

iTrader: (2)

Because it just isn't possible. Doesn't matter if it's 3.5 or 12 liters of displacement. 41 ft lbs gained is like adding a low boost supercharger on a 3.5, not a pulley, a TB spacer and some runner porting.

Just focusing on the torque gains, not the hp gains: it's been mathematically proven how much a lighter pulley can really make. And it's more like 2 whp in 4th gear, where it would be on the dyno. Certainly not 20!

https://acurazine.com/forums/showthr...t+pulley+calcs


Look at it this way. Take a base 6MT TL which makes around 200 ft lbs at the wheels from a 233 crank rating. That's a parasitic loss of 33 ft lbs total.

So, starting at the crank pulley, which is the first mechanical unit to use power to turn, you then have the flywheel, clutch, transmission, all its shafts, gears etc, then the axles, the hubs, rotors and finally a front left wheel at 25 lbs, a front left tire at 25 lbs, a front right wheel at 25 lbs and a front right tire at 25 lbs.

If all the above is only taking 33 ft lbs to turn, how can dropping from an 8lb to a 2lb pulley magically free up 20 of those 33 ft lbs? It simply can't. Basic physics also tells us that lightening the load furthest from the power source will have the greatest impact. If you were to hold a 20 ft long bar in front of you, at arms length, shoulder width apart with a 10 lb weight on the sides of both hands it would take less energy than holding the exact same 20 ft bar with the exact same 10 lb weights at the very ends of the bars. The pulley is analogous to holding the bar with the weight close to each other. It takes less energy to overcome.


Lightweight wheels and tires won't even show much of anything on the dyno, let alone a pulley. Most of the gains from the pulley will happen in the lower gears. (Same with lighter rolling stock, just a more profound effect)

thisaznboi88

iTrader: (7)

not going to argue with you. Just going to wait till this guy give proof

https://acurazine.com/forums/3g-tl-performance-parts-modifications-112/my-3-7-mani-zdx-tb-pnp-runners-build-thread-870327/

Sonnick

The operator probably downshifted or something to be honest, which would explain the huge difference in both HP/TQ. A pulley, TB spacer, and ported runners (on an almost stock car) wouldn't show those gains.

Ported runners on a stock car probably wouldn't do much. Add bolt ons/intake manifold/TB and you're gettin somewhere...that goes for most mods. If you mod the intake to he11 and have a stock exhaust, you won't gain as much. Once you open up the exhaust, the real gains will show and vice versa.

justnspace

iTrader: (1)

lol. in for results, but agree with the anx and sonnic

I'm still angry at the claims of "scratching 2nd"

anx1300c

iTrader: (2)

Where in that thread do you see anything about proving that a pulley can free up 20 ft lbs?

Or that porting just the runners and adding a one inch TB spacer nets 21 ft lbs?

I'm not trying to be a dick here. I just want people to stop and think logically about what they're reading on the internet and take it for what it's worth. I've seen the threads on that 3.5 that you linked to. IIRC, they were done on the same dyno, but that means squat.

Sonnick

IIRC, 3gstealth put down 243-244 SAE last time. So a 6-8whp gain isn't bad at all. That leads me to believe I will gain some solid power with a larger CAI considering I gained 15whp with the 3.7 mani/TB/runners on the AEM V1. Good job stealth!

Sonnick

ANX: Just another point about the UR pulley/TB spacer/ported runner combo...'40ft lbs of torque.' The 8G 3.5 6MT puts down ~235/225 stock. The 7G 3.0 6MT puts down ~215/195. That's 'only' 30ft-lbs from 0.5L of displacement. /discussion.