Forge Valve install/impressions

[patty AT forge]

I believe the sound comes from the concave shape of the piston face. I've asked for a prototype "smooth" faced piston and one that is convex to see how it alters the sound. If at all.

 

[Powerslave]

it does dude, the power is much sharper, i acutally put my recuiric back on yesterday cuase of the farting between shifts i don't want to blow out my cats, Jordan at cp-e is making me a map for the standback to fix that. Car feels signifacnlty slower by comparison. That slam of of boost is gone, definatly a big diff in power. With the vta the boost is hard and sharp.

 

[sleeper3]

put it on a dyno and post the graphs.

 

[SuperStretch18]

On the off chance that it raises the net intake temp 20 degrees, it would be like the difference between driving in 60 degree weather and 80 degree weather for a split second. It wouldn't be across the powerband...

 

[sleeper3]

On the off chance that it raises the net intake temp 20 degrees, it would be like the difference between driving in 60 degree weather and 80 degree weather for a split second. It wouldn't be across the powerband...

exactly. I don't see how it could possibly make a huge difference... but then again, I haven't tried it.

 

[Powerslave]

i can't say for sure cuase I don't remeber but i think the turbo raises the intake temp to 200 plus degrees and then the intercool marginally cools it down, if this is true then its more than 20 degrees...

 

[Powerslave]

exactly. I don't see how it could possibly make a huge difference... but then again, I haven't tried it.

try it, see what your opinion is.

 

[sleeper3]

i can't say for sure cuase I don't remeber but i think the turbo raises the intake temp to 200 plus degrees and then the intercool marginally cools it down, if this is true then its more than 20 degrees...

yes, but the vented air is combining with atmospheric air. it's not shooting straight into the turbo by itself. also, the heating effect on the hot air is diminished, because it is already hot. it's like microwaving cold food vs hot food. they both get hotter, but the heat in the cold food is increased far more greatly, because it started off cold.

 

[Powerslave]

yes, but the vented air is combining with atmospheric air. it's not shooting straight into the turbo by itself. also, the heating effect on the hot air is diminished, because it is already hot. it's like microwaving cold food vs hot food. they both get hotter, but the heat in the cold food is increased far more greatly, because it started off cold.

you just proved what i am saying. if ytou take a pot of cold water and pour 12 ounces of boiling water into it the water will raise to a certain temp, take a pot of hot water and pour 12 ounces of boiling water into it. Wich one will be hotter? The over all temp is much colder with vta vs the over all temp of recir =horeseees & torqueees..lol

 

[subparpunk03]

I call shenanigans.

vta won't make enough of a temperature difference to matter, the volume of air being recirculated is much smaller than the volume of air making its way from the atmosphere, so it would have to be VERY VERY VERY hot to make more than a couple of degree difference in the intake temp. Couple of degrees = 1-2 hp MAYBE, too small to tell with el dyno de butt. The ambient temperature will make more of a difference than vta vs recirc.

Not to mention that this isn't a PERSISTENT temperature increase of the intake temperature, as soon as the valve shuts, its ALL atmospheric air entering the intake tract and no metered air. The turbo will process the metered air from the bypass extremely quickly. So even if VTA DID make a difference temperature wise, it wouldn't be for more than a second or two.

 

[subparpunk03]

you just proved what i am saying. if ytou take a pot of cold water and pour 12 ounces of boiling water into it the water will raise to a certain temp, take a pot of hot water and pour 12 ounces of boiling water into it. Wich one will be hotter? The over all temp is much colder with vta vs the over all temp of recir =horeseees & torqueees..lol

pot of cold water is a bad example b/c its just sitting in a pot, not flowing through a system... like an engine takes air in and then pushes it out when its done. Its not the same thing at all.

 

[Powerslave]

I call shenanigans.

vta won't make enough of a temperature difference to matter, the volume of air being recirculated is much smaller than the volume of air making its way from the atmosphere, so it would have to be VERY VERY VERY hot to make more than a couple of degree difference in the intake temp. Couple of degrees = 1-2 hp MAYBE, too small to tell with el dyno de butt. The ambient temperature will make more of a difference than vta vs recirc.

Not to mention that this isn't a PERSISTENT temperature increase of the intake temperature, as soon as the valve shuts, its ALL atmospheric air entering the intake tract and no metered air. The turbo will process the metered air from the bypass extremely quickly. So even if VTA DID make a difference temperature wise, it wouldn't be for more than a second or two.

???what? the volume of air shoooting through that hose is huge look at how big the hose is ther is 16psi pressureing 200degrees hot air into the turbo, its not a couple of dgrees.. the over all temp of the air in side the combustion chamber is hotter just like the pot of water senarion.

 

[Powerslave]

pot of cold water is a bad example b/c its just sitting in a pot, not flowing through a system... like an engine takes air in and then pushes it out when its done. Its not the same thing at all.

it is the same it doens't matter that it is moving throug a system the over all temp is hotter cuase the hot air is shot back into the system..

 

[subparpunk03]

yeah and compare the size of the bypass hose to the size of the intake hose...

also, show me proof the temperature of the air on the cold pipe is 200 degrees. I can touch it bare handed after driving hard.

 

[Powerslave]

the intake hose is bigger but its not pushing air though it at 16psi... i give up guys i got to work...lol

 

[mckraut]

also, show me proof the temperature of the air on the cold pipe is 200 degrees. I can touch it bare handed after driving hard.

+1

 

[subparpunk03]

I guess both sides of this argument are kind of pointless until someone takes a thermo-meter-mo-tron and does an actual comparison of temp right after the intercooler when doing VTA vs. recirc.

I'd put money on it thats its not much of a differene.

 

[Ryz]

with the forge VTA, do you hear that horrendous "ping" noise?

You must me scared to come outside if you consider a ping noise to be "horrendous".

 

[Powerslave]

if i remember correctly cobb tuning did a test of the intake temp after turbo was like 260 degrees and post intercooler like 190degrees, its somewhere on tis forum., so 16psi of 190 degrees being shot back into the intake tract is a colder than room temp? you guys are brilliant..lol

 

[subparpunk03]

You must me scared to come outside if you consider a ping noise to be "horrendous".

???

I am not sure what you are trying to imply here.