How much gain from just upped boost?

[kornydeftones]

Im not really sure what to search for here so I decided to start a new thread. Im trying to find out what kind of gains that can be had just on a stock dsm w/ boost controller and gauge. Yeah I just have a 13g on the auto right now since I got it 3 days ago, but I'll be putting my ported 16g on next week w/ all the supporting mods. So no flaming on the 13g and auto. I know, I know. Anyway, does anyone have any dyno sheets, videos or ideas of how much hp gain from upping the boost from stock 10psi to 15psi? I think Ive seen a video before of one but that was before I was REALLY into DSMs. A friend told me that general rule of thumb is ~10hp per psi. Is he correct or even close? I didnt think I could gain about 40-50hp by just another 5psi from stock. I know there are good gains but didnt think near that much. Let me know guys! Thanks.

 

[TheTSiGuy]

Im not really sure what to search for here so I decided to start a new thread. Im trying to find out what kind of gains that can be had just on a stock dsm w/ boost controller and gauge. Yeah I just have a 13g on the auto right now since I got it 3 days ago, but I'll be putting my ported 16g on next week w/ all the supporting mods. So no flaming on the 13g and auto. I know, I know. Anyway, does anyone have any dyno sheets, videos or ideas of how much hp gain from upping the boost from stock 10psi to 15psi? I think Ive seen a video before of one but that was before I was REALLY into DSMs. A friend told me that general rule of thumb is ~10hp per psi. Is he correct or even close? I didnt think I could gain about 40-50hp by just another 5psi from stock. I know there are good gains but didnt think near that much. Let me know guys! Thanks.

There is no set hp per psi calculation.

however, I've seen stock down to the aircan DSMs with just a MBC run 14.5 before. AWD and great driving of course. And this is on a 14b powered 5 speed as well. Not sure what an auto 13g powered car would do.

 

[kornydeftones]

yeah that's really good at 14.5 but I guess Im looking more for hp numbers and what kind of gains I should see. I also know some people will say to try it out but Im not looking for that, nor do I want to dyno it before and after that mod. I just want some quick hp until I have the time to do all my mods that I have sitting here.

 

[TheTSiGuy]

Well, we'll start off with a base estimate.

Import tuner pulled off 157 at the wheels on a stock awd 5 speed 14b car.

Your car has more drivetrain loss, smaller cams, and a smaller turbo. So lets say It will only make 140 to the wheels. Maybe less, maybe more. hard to say...ive not heard of many people on this board with 13g powered dsms dyno'ing stock.

 

[4geze63]

157 is incorrect, a 1g, or 2g AWD will dyno anywhere from 160-180 AWHP, 1g auto, I would say 150-160 AWHP.

Uppung the boost makes more of a diff if you have the supporting mods/larger turbo(no T25), With stage one mods 1psi could equal ashigh as 8hp on a tuned car.

 

[kornydeftones]

so you're saying it wont make that much difference for me with no other mods? Anyone else have any input? I know there is a vid somewhere of a dyno and I thin that person hit 230 hp with 15psi and maybe air filter or something.

 

[DSMeclipse4G63]

157 is incorrect, a 1g, or 2g AWD will dyno anywhere from 160-180 AWHP, 1g auto, I would say 150-160 AWHP.

Uppung the boost makes more of a diff if you have the supporting mods/larger turbo(no T25), With stage one mods 1psi could equal ashigh as 8hp on a tuned car.

13g and t25 are equally horrible....

 

[4geze63]

if you up the boost on a stock car, you will still gain decent hp upto 15-16psi with a 14b, nothing smaller, you will benifit more with a full exhaust,intake and eventaully a turbo upgrade., then you would really feel it.

 

[kornydeftones]

ok well I guess I wont get the answer I wanted to hear but that's alright. And dsmeclipse4g63, I didnt need that kind of input. Im putting my mods on when I have the time. Im just looking for a nice quick boost until I can put on the 16g, ported ex mani, fuel stuff etc etc.

 

[TheTSiGuy]

157 is incorrect, a 1g, or 2g AWD will dyno anywhere from 160-180 AWHP, 1g auto, I would say 150-160 AWHP.

Uppung the boost makes more of a diff if you have the supporting mods/larger turbo(no T25), With stage one mods 1psi could equal ashigh as 8hp on a tuned car.

How is that incorrect? Im just telling you what import tuner got on a baseline test from their 1992 TSi awd man.

 

[4geze63]

I bet it wasnt preforming at its peak preformance, it should be able to get atto 10whp more, at best

 

[nutshot]

This is really simple.

Bench + Racing = Benchracing.

Do you see how that equation works?

If you want to modify your car, then do it carefully and let us know what happened. Track times are the easiest measurement as HP and assorted other figures are both misleading (600 horses sounds like a lot until it's coupled with a 6 ton Kaiser) and variable (no two dyno's measure exactly the same).

Welcome to 'tuners, let us know how your mods work out for you.

 

[SpoolnTsi]

Ive heard on average that 1lb of boost is roughly 10hp give or take depending on turbo. Now granted that will not be the same for every turbo. Obviously, 1lb from a 16g will be worth more than 1lb from a 13g

 

[InferiorWang]

How much hp you get per psi is very dependent on a wide variety of things. No one is going to be able to give you even a rough estimate. And I seriously doubt you can get 10hp per psi. You might get 3 or 4. Just remember that the 13 is tiny and you'll probably not have much efficiency up top.


And so you know, most people here are concered with what numbers they can run at the track. That's a better guide to go by than just hp, because my turbo volvo has 10 more hp and 35 lb ft more torque than my brother's 240sx, but his car is still faster.

 

[98spydert]

Actually the only scientific number I've read in text books is 7% gain in tq per psi(do the math for hp). But there are so many variables with different turbos, compression ratios, supporting factors, and what not that the book even said that number can't be applied to real world situations.

An educated guess for gains made by upping the pressure from 10psi to 15psi on the little 13g, anywhere from 10whp-20whp. I can't imagine much more without supporting mods or a more efficient turbo. Good luck with your modding

 

[sjwelna]

HP doesn't come from psi, which is only a measure of the pressure inside the intake system of the motor after the turbo.

You gain HP by increased airflow.

Think about it this way; if you have a syringe, full of water, push on the plunger just alittle bit. The water came out pretty slowly didn't it? Now, refill it and push on the plunger with all your worth. A lot more water came out a lot faster didn't it? Same concept with motors. Higher psi (pressure) will yield higher flow.

More flow = more hp, and you get more flow by increasing pressure. A generally accepted rule of thumb for air flow and HP is something around this, 1 lb/min of airflow typically nets about 10 crank HP on a decently tuned pumpgas car.

If you want to know how many HP you will gain from "x" psi of increased boost, find a compressor map for the 13g and go to town. Again, this will still only be a rough estimate of how many HP you will gain, as every car is different .

Just thought I would clarify this.

-Steve

P.S. I'm not trying to come off heavy handed, I just thought someone might benefit from that info.

 

[GSXeclipsePSI]

Lets see... I have a Evo3Big16G wit Supporting mods.. No FMIC

I was at 10psi and on a highway pull my friends stock 5.0 was pulling like 4 cars on me wit a 4 to 3 drop...

I upped my boost to 19psi (Now 21)... But a 4-3 drop I did about 6 cars infront of him... So that an Incress of 10cars....

Then I got a good speed, and he dropped to 3.. I dropped to 2nd... DAMN dude, he disappared.... I pulled 8cars easy on him.... infront.... NOT TOO BAD!

 

[sjwelna]

!!! :laugh: That was rediculous... just go back and read what you wrote :laugh:





So in the end of your ramblings, hp comes from increasing pressure or as the author put it, "upping the boost." Obviously efficiency comes into play to determine the amount of "flow" from turning up the psi.

HP is not directly related to pressure, it is to airflow however.

Yes, efficiency come into play, and that is exactly why I told him to go find a compressor map.

Would you rather have 15 psi on a t-25 or on a 50-trim....?

-Steve

 

[nutshot]

Tuner #5 "My bench is way ####ing faster than yours, bi***!"

 

[sjwelna]

Tuner #5 "My bench is way ####ing faster than yours, bi***!"

!

But seriously though, all I was trying to do was promote a better understanding of how a damn motor makes power, and I get flamed?

Pressure doesn't mean jack if you aren't getting flow into the engine. And with that, I'm not posting on this thread anymore because it's futile.

-Steve

 

[saw wave analog]

lets look at this arguement from someone who just stumbled into its perspective (me)


one guy posts up a totally relevant and correct point about how turbos work in a thread started by a noob. not DIRECTLY related to the original subject but still definately on topic and good info to know


another guy insults him and implies he doesnt know what he is talking about for no good reason, then calls him a dumbshit that is ruining the forum even though the accuser isnt doing anything except attacking another poster...



who is the retarded one again?

 

[98spydert]

I know I shouldn't reply anymore but honestly, the newb asks how much he can expect to gain while turning up the boost on his 13g. A reply pops up pointing out how much more efficient a larger turbo is. On top of that he's compairing a 14b to a 16G. How is that relavent to anything the newb asked? Then "don't worry about psi, you need to increase flow" is there to laugh at. If he had asked how to get more from his car, or why he's knocking at high boost levels on a small turbo, great.... If I'm retarded because I look at the topic question before posting, fine sign me up for the special olympics. I should be there anyways for arguing on the internet

 

[kornydeftones]

I dont know how this got blown into a stupid arguement about this crap. Why cant people keep the posts on topic? I use the search engine alot on here and I sure as hell dont want to see some people bitching, thinking they know more than the other on a topic Im trying to learn about. I guess my question got answered in the first few posts...

 

[Generation1JeY]

this is some funny shit, can u guys keep arguing i'm about to go get some popcorn and a blow up chair

 

[14.5 drift]

I whole heartedly agree with 98spydert on this one.......Seems like you ask a question and some snot nose know it all has some little answer for every thing and of wich he knows nothing about but heard the wisemen discussing last week and now he thinks he's well versed on the subject. Not that were all not responsible for pulling the same shit once when we were 10 too but, there seems to be an overflow of this crapola.


I feel like this thread is all of a sudden going to turn into a boost vs flow thread when ultimatly who's thread is this? Thats right........kornydeftones, and kornydeftones would like to know if upping the boost will raise his power output, in short you all should realize you are working for the same thing, more hp, and should have realized that, and came to an agreement, instead members more obsessed about being right and members feeling cornered by 5 year olds with wiffle ball bats some where along the line, thought no, this thread would get the most benefit if we bang heads the hole time and waste an entire megabyte of ram space on some searver some where in the middle of new mexico (where ever it is)


You all make me sick.......