alittle info from AEM

[CWiLL]

Well i was dataloging my car last night, it was kinda funny i knew the injectors were maxed out but didnt knw where. Im seeing 13.8psi of boost, 1st gear i cant get more than 9psi. So im looking at injectors and there at 203% duty cycle. lol i have bigger ones to go in but didnt relize that there that maxed out. im trying to make a print screen so i can post the log. the a/f isnt that bad it leans out to about 12.4 up top. Im also at 14.6degrees of timming at 8psi of boost till redline.I think i could add alittle more timming up top too. Wrx 440s arent that big or im making more power then i thought. owell i thought id share with everyone. i will post the log in a few. Wish me luck at the track tonight.

Chris

 

[stomper65]

I can't wait to see what you do. Take a video again. Your car has to be the fastest Street driven P5.

 

[65racecoupe]

Track tonight, huh?

Slicks?

 

[tekkie]

are you running 87 octane? lol

I have a hard time believing that its doing 200% duty cycle on 440cc injectors at 14psi, I am doing 15psi on the stock turbo and they are only at ~80%, thats on 94 octane at 12.afr

I understand that your turbo is bigger but I cant see it being that drastic

 

[wicked]

are you running 87 octane? lol

I have a hard time believing that its doing 200% duty cycle on 440cc injectors at 14psi, I am doing 15psi on the stock turbo and they are only at ~80%, thats on 94 octane at 12.afr

I understand that your turbo is bigger but I cant see it being that drastic

also consider the turbo he is useing flows more approx. double the CFMs.

 

[tekkie]

yeah I know that and I could possibly see 150% but not that much

I guess maybe once it gets to a certain point it goes way out of wack maybe?

 

[Aricjm15]

get an fpr and boost your fuel pressure. it doenst have to be a fancy one like the begi rising rate, just somthing to bump it up a little bit. its cheaper than buying all new injectors and it wont really hurt anything either, although you will need to retune almost everything to compensate for the extra fuel.

 

[kyle's protege5]

also consider the turbo he is useing flows more approx. double the CFMs.

Flowing double the CFM shouldnt matter. 15 psi is 15 psi. Since they are both going into the same size of chamber or area of volume, the amount of air in there will be the same.

 

[65racecoupe]

Flowing double the CFM shouldnt matter. 15 psi is 15 psi. Since they are both going into the same size of chamber or area of volume, the amount of air in there will be the same.

You are VERY wrong. PSI Vs PSI when comparing different turbos(say a 28RS and a 30R) they will make different power at the same boost level. The larger turbo will flow a higher CFM.

 

[Aricjm15]

Flowing double the CFM shouldnt matter. 15 psi is 15 psi. Since they are both going into the same size of chamber or area of volume, the amount of air in there will be the same.

thats like saying an air compressor rated at 6cfm at 90psi will flow the same amount of air as one rated at 20cfm at 90psi
s*** if this were true there would be no need for dealers, and car shops to have huge air compressors, they would all be running off of those 12 volt compressors you can plug into your car to run all of their tools and air guns.

 

[kyle's protege5]

You are VERY wrong. PSI Vs PSI when comparing different turbos(say a 28RS and a 30R) they will make different power at the same boost level. The larger turbo will flow a higher CFM.

I totally understand they flow different CFM's, but i disagree that just because you say fill a 2 liter bottle to 10 psi at 10 cfm's or another 2 liter bottle to 10 psi at say 20 cfm's, you are still going to have the exact same amount of air in the bottle therefore requiring the exact same amount of gas to make a certain ratio.

A misconception that people have is that 2 turbos at the same psi should make the same HP. I didnt say that. I said that at the same volume and psi you have the exact same amount of air. Now a better flowing turbo has the ability to put more air in meaning it can sustain a higher ratio of air requiring more fuel, but at any given millisecond the volume of air in the cylinder is exactly the same no matter what the turbo if the psi is the same.

If his higher cfm was putting more air in to the same size of cylinder than another turbo did his PSI would be higher too.

 

[kyle's protege5]

thats like saying an air compressor rated at 6cfm at 90psi will flow the same amount of air as one rated at 20cfm at 90psi
s*** if this were true there would be no need for dealers, and car shops to have huge air compressors, they would all be running off of those 12 volt compressors you can plug into your car to run all of their tools and air guns.

no its not at all. Its like saying that an air compressor with a 20 gal tank and flows 6 cfm's at 90 psi and another with a 20 gal tank flows 20 cfm's at 90 psi have the exact same amount of air in their tanks.

20 galllons of air at 90 psi is the same volume of air no matter what it flows.

you guys are missing my point. his larger cfms only means that he can maintain 15 psi more easily than one that flows less cfm's. But no matter what cfm's have no relation to the volume of air in a cylinder if the psi is the same.

 

[stomper65]

I totally understand they flow different CFM's, but i disagree that just because you say fill a 2 liter bottle to 10 psi at 10 cfm's or another 2 liter bottle to 10 psi at say 20 cfm's, you are still going to have the exact same amount of air in the bottle therefore requiring the exact same amount of gas to make a certain ratio.

A misconception that people have is that 2 turbos at the same psi should make the same HP. I didnt say that. I said that at the same volume and psi you have the exact same amount of air. Now a better flowing turbo has the ability to put more air in meaning it can sustain a higher ratio of air requiring more fuel, but at any given millisecond the volume of air in the cylinder is exactly the same no matter what the turbo if the psi is the same.

If his higher cfm was putting more air in to the same size of cylinder than another turbo did his PSI would be higher too.

You are about to get (owned) 'Where and who gave you this info?

 

[kyle's protege5]

You are about to get (owned) 'Where and who gave you this info?

I'll give you $1000 if you can prove that putting air into a say 1 gal container faster and filling it to say 10 psi, it has anymore air in it than if you filled it to 10 psi very slowly.


And buy the way I'm an engineer who designs pump and flow control valve systems for an oil refinery.

I doubt you will ever (owned) me

 

[stomper65]

I'll give you $1000 if you can prove that putting air into a say 1 gal container faster and filling it to say 10 psi, it has anymore air in it than if you filled it to 10 psi very slowly.


And buy the way I'm an engineer who designs pump and flow control valve systems for an oil refinery.

I doubt you will ever (owned) me

This is not the point. We are talking about turbo's and why a larger one will make more power than a small one.

For an engineer you don't sound like you know what you are talking about. I would love to work next to you. I would look smarter than an engineer when in actuallity, I'm not. Where did you get your degree, because you can't spell or put sentences together correctly.

 

[Bigg Tim]

I've heard something similar, 10psi is 10psi no matter what size turbo. It's the "quality of air" that makes the difference. I think ol boy is right here, but I am FAR from being an expert, I just repeat what I've heard.

 

[kyle's protege5]

This is not the point. We are talking about turbo's and why a larger one will make more power than a small one.

For an engineer you don't sound like you know what you are talking about. I would love to work next to you. I would look smarter than an engineer when in actuallity, I'm not. Where did you get your degree, because you can't spell or put sentences together correctly.

lets see its almost 4 in the morning here, Im tired as hell, cant sleep because the dang dogs woke me up, I'm kinda cold down here in the basement, I can spell perfectly, just cant type for s*** on this laptop, and Purdue by the way.

Anthing else?

O and i built my entire turbo for my car, from scratch, and got a best of 242 whp so far on stock internals and premium gas. just a little better than the stock 90 whp for the automatic.

 

[yesiownaskyline]

Kyle- you're comparing 2 items with the same volume and different flow rates, that's why you think this way. The stock T25 and, say a 30R or any other turbo for that matter will have comletely different flow rates regardless of pressure, but the housing volumes are different... The T-25 @15psi will flow much less than the T28/T30 @15psi because of the difference in cfm due to volume differences (correct me if I'm wrong) increasing cfm. Theres no two ways about it- bigger turbo w/better flow=>more airflow=>more fuel burned=> bigger bang.

You're right about the pressure being constant regardless of cfm, but think about it in an open system vs. pressurized. Increased cfm (the rate at which 15psi is flowed into the system) makes ALL the difference. Dont think about it as constant pressure, but more as a race to see how much airflow is generated over a set time.

Your argument makes sense in theory, but you're comparison is way off...

 

[65racecoupe]

Nope.

Here is the deal....

You have turbo #1 (T3/T4), and turbo #2 (T30/40)

Yes, the air from turbo #1 is flowing as fast as turbo #2 at the same PSI, say, 10 PSI.

Even though they are flowing at the same rate, there will be more air molecules put into the same space.

Here is a decent analogy (although this one deals with momentum versus cfm and turbos, but you get the idea)....

I punch you in the face with my fist at 40 mph versus Bob Sapp (400 pound Pride Fighter) hitting you in the face at 40 mph.

Which one will hurt more? I would like to say me, but hell no.

 

[65racecoupe]

and Purdue by the way.

What year did graduate?