You have the 5 bolts?

 

no i dont, i was just gna order them from zzp, you can pm me so were not threadjacking your thread

 

Lol ill bump in the afternoon to see if anyone has an idea about the boost question, PM sent

 

Your cooler intake charge from the meth could be the reason your boost went up. My boost is always higher when it gets cooler out.

 

If all you did was the meth and a tune to get from 15PSI to 17 PSI boost, your makeing more power.
Boost gauge is your manifold pressure. Generaly speaking the most manifold pressure you have the more power your makeing. This is not always 100% true. If all you did is meth and tune, then ya, id say your makeing more power iwth more boost.
If you ported your head, changed your cams, did an exhaust system, then you might not be makeing more power with the higher boost.
But when compareing the engine to itself,
The higher the airpressure in the intake manifold, the more power the engine is produceing.

 

Didn't read all the thread. Here's my thoughts

Just txt or call me goober! You know that I have forgotten more about these cars than most will ever learn! On some setups, methanol sprayed pre-blower has been known to increase PSI. The cat is not clogged as you have no cat (this is for the others reading, not you Mark, You know you're catless)

The pacesetter header is what I run on my car and with my project coming up, you are welcome to my setup.

Gasoline or oil DO NOT effect boost readings. (Again, not directed at you Mark)

The stock boost gauge is electric and reading a digital signal. That means it is only reading what the car thinks it is seeing. A mechanical setup is what you need to know the TRUE psi. Mine has read 10psi before on a 2.6 pulley. Then goes back to what it should be reading.

What time of day was this? it's been cooler at night and cooler air = denser = more 'boost'

You worry way too much about this lol. These cars are not made out of glass and you will be fine bro. I got your back on the car as your tuner AND more importantly, as your friend.

No..

 

My exact thoughts .....

 

Great point, this is the one thing i overlooked

This subject has registered over night and makes complete sense now; im thinking once i get a mechanical boost gauge it should read more accurate considering its coming directly from a vacuum line vs a pcm reading of what the car thinks its seeing

The meth is cooling down the intake charge temps and the car is now thinking its seeing "more boost"

Man since i be boostin more i must be gettin more power yo!!! I should hold with your TVS tom, since your boostin like 19psi and i be boostin 17psi, we should be right next to each other yo!!! Boost is mad tytee yo!!!


HAHAHAHAAHHA it makes me LOL when people talk like that and think "since i be boostin more i should have more power" so i had to make fun of the general thought process that boost=power

 

Please correct where I am incorrct.
I do not understand how, when compareing an engine to itself.
More boost does not mean more power.

The power comes from the combustion of the Air/Fuel charge in the cylinder.
As more air enters, more fuel is injected and burned.
More burning = More expansion/pressure pushing the piston down.
More force pushing the piston makes more torque and speed
Power = (Force X Distance)/Time
So more Fuel/Air burnt = More Power
So now the more air you have comming in the more fuel you get, the more power you get.
Now, the higher your intake manifold pressure is, the more air you have comming in.
This means more air is being pakced into the cylinder on the intake stroke.
More air in cylinder = more fuel = more fire = more power.
Colder air = More dense air = More oxygen molicules per cubic foot = More fuel, = more fire = more power

More boost means more air means more air into the cyldiner.
Where am I wrong?
Note: It's not my attempt to be a smartass, but either I understand something incorrectly,
or I expressed something incorrect.

 

Sorry if i came off as a smartass in my general reply, i wasnt trying to be a dick to you, i was just joking aroudn in general, and the concept you have described is not incorrect; but more boost doesnt always mean more power. there are other factors to take into consideration that play a factor into how much boost youre making. ill try to explain my best as to what were saying.

Generally speaking, increasing your boost with a turbo via boost controller or by dropping pullies on a blower will increase your power to a certain degree; however, its also a measure of restriction and other factors such as elevation, air density, etc determine how much "boost" youre making.

There may be a guy in Denver, Colorado with the exact same setup as me but he would be at a much higher elevation, less air pressure, and thus making less boost if im correct; either way, he wouldnt be making the same amount of boost as me.

Now, lets use my setup right now for reference and this may give you a better idea of what we mean. I have a 2.99" pulley, factory header w/gutted cat and the GMPP catback. Disregarding the fact that now my intake charge temps are lower with meth, the blower is making 15psi. Now lets say i get a new header and a downpipe. This decreases the restriction some and now there isnt as much pressure, thus not as much "boost" but did we loose power? no, we gained power. lets also say i get a ported head. this increases the airflow on the intake and exhaust side and there is alot less restriction, therefore now i would be making less boost, but did we lose power? no, we gained power. im sure there are probably 1 or more other ways to decrease restriction as well. Now lets say i keep everything the way it is and drop to a 2.8" pulley. were now making more boost and we have also increased power too, this is what youre thinking of when you say youre increasing boost and gaining power, which is partially correct.

Ill also use my buddy WickedSS as an example, who has also posted above.
TVS with a 3.0" pulley, full 3" exhaust, making eh 20psi...? it was around there, i cant remember exactly, but heres my point...he had his head ported, put everything back on, same 3.0" pulley and exhaust...was then making 16 psi...less boost, MORE power, a much more efficient setup, less restriction.

Has since dropped to a 2.8" pulley and is making less boost than he was making with the 3.0" with the factory head, but is making alot more power than he was when he was making more boost.

PSI=pounds per square inch, or force per unit area. if you decrease the area in which a constant force is being applied you have decreased the pressure, or PSI

So when you say more boost=more power, this is a general statement and is kind of correct, but also understand that it is a measure of the restriction and you basically want to be making as little boost as possible with the most power on your setup.

I may not have explained/described some of this in the best way, so Wicked and Staged07SS, or anyone else for that matter, feel free to chime in, tweak things i have said, add to what ive said, etc

I understand the concept its just not always easiest to convey ideas through a keyboard/computer lol

And if in any area im incorrect, please correct me lol

insylem, does the concept im trying to explain, in regard to what were saying, make more sense now?

 

Insylem, blower/Turbo efficiency and heat must be considered. Psi doesn't make the power, cfm (flow aka breathability) is where the power comes from.

 

Thank you for adding to my novel tom, i failed to mention CFM

The letters on your keyboard are now fading as a result of my pecking fingers

 

Ok I Get it now. Thats kind of what I thought. Of course if you make changes to your engine's volumetric efficency. then your going to be makeing the same power at a lower boost number. Wich is good becuse lower boost numbers take less torque off of your crankshaft. (In an SC)
And yes I remember now that
Pump = Create flow.
Restriction = Create pressure.

However there are some circumstances where a restriction can DECREASE pressure
Such as the narrowing area in an old carburator.

and and opening can INCREASE pressure.
Such as the difuser of a turbine engine.

 

From my aviation background I tend to think of "Boost" as in terms of absolute manifold pressure.
Many piston aircraft engines have a pressure gauge (Normaly direct reading mechanical) off their intake manifold. Instead of being calibradte in vacume " Hg and then Boost PSI, its calibrated to Inches Hg absolute. So generaly speaking anything above 29.92" on the gauge would be boost pressure. 15PSI of boost would generaly be arround 60 Inches of Hg Absolute.

 

I understand your point, but that information does not apply to this motor. It can be confusing to people not mechanically knowledgeable

 

I'd like to point out.. that 2 years ago.. when i said I picked up about a psi when i sprayed methanol.. everyone said i was on crack..... then i posted a video..

 

Vid was proof, but you were still on crack. Just sayin

 

More boost means more pressure. more pressure means more heat. hotter air means less density which means less power. lets go with 7.4lbs boost IF ambeint air was 68degress and manifold air was 131 this is the Density Ratio... (68 + 460/ 131 +460) * (Boost + 14.7/ 14.7) = (528/591) * (22.1)/ 14.7) = .8934 *1.5 = 1.34
Density ratio is 1.34. which is 34% gain in Hp. If the manifold temp raises to 180 do to more boost you need alittle more than 9lbs to get the same performance gain as 7.4 gave you

 

Oh I get it now. I didn't realise we were changeing the temps of the IAT2.
This does make more sence This formula seems to look like the general
gas law is that correct?

 

I had to google that but yeah, it looks like the same theory but the gas law seems to be dealing with much more pressure. The air density ratio formula i showed is great cause if you can put a high speed air temp. sensor in the manifold. you can take that temp and your boost and figure how much gain you are getting. There is a book that explains all this better than i do. its a complete study of superchargering. if i can find that title i'll post it for you.