what's the max psi a stock t25 can handle?

[CasopoliS]

So there is not direct replacement for the stock MAF? I have the Unichip, so I cannot just change my fuel curve.

 

[jeffmsp]

guys the reason alot of people think the T25 is small is because they are running lower compression motors that are designed for boost EX: 4G63, wrx 2.0l etc all have in the area of 8:1 compression. With the T25 they are not able to make the same kind of power that we are with 9:1 compression.

Merit figure: 14.7 + Xpsi x compression ratio. (assuming 100% efficiency)

so say we take a GSR Honda motor with 10:1: 24.7 X 10 = 247HP at 10psi.
FSDE Motor: 24.7 x 9 = 222.3hp
4G63 Motor: 24.7 x 8 = 197.6hp

None of these numbers are exact, but it gives you an idea. If I had a stock MSP all over I would shave the head to achieve as close to 10:1 as I could get, lose my cats, buy an afc,colder copper plugs and good gas and make as much power using the stock hardware at stock boost as I do with all my goodies at 10psi. Then if I wanted to run more than 10psi just put in the methenol kit to keep the detonation and heat away. Pretty sure thats the most "economical" way to max out what the stock motor can take and aside from the ditched cats, would appear to be 100% stock.

 

[apocman]

cool...

 

[Bigg Tim]

I was always told that you want a lower CR if you run boost. How would our motors fair with boost on a 10:1 CR or higher? The lower the CR, the more boost you can run.........right?(dunno)

 

[jeffmsp]

to a certain extent, with higher compression cylinder temps soar, but if you have the supporting mods EX: TUNING , Methenol injection, 94+ gasand a good exhaust system then you dont have a problem until you start making over 300HP with high compression. My buddies 10:1 GSR turbo screams at 10psi. He dynoed 265whp. Any higher than that and I think you would wanna lower your compression and add a bigger turbo. Really it depends on what you want out of the car, if you want a drag car then bigger turbo and low comp, for me I like power everywhere so Im going a different route.

 

[orphman]

Becuase I could get the MAF and wastegate for the same price as I could buy a rebuit stock MAF and the MAF has never been used. IT is designed to be used for 300hp plus.

here was Black Zoom-Zoom reply to me:

Background of a MAF:

The MAF sensor determines how much airflows into your engine (using hotwire(I won't get into that)) and converts that data into a voltage signal. It sends the signal (0-5volts) to the pcm, the higher the voltage the more air the pcm is expecting thus the more fuel. Once the voltage reaches 5v the pcm shuts off the fuel supply because in a stock system it should never reach that high and determines there is a problem.
If you want to make more Hp it takes more air. You have to get around reaching the 5v from the Maf.

Want more Hp and accuratley tune it?

To do that you have to increase the amount of air into the engine and be able to register it. This bigger MAf sensor increases the amount of air per voltage. This allows you to accuratley read how much air is getting into the engine, unlike the stock maf which you have to cap the voltage to run more hp(fcd). This makes tuning 50x's easier and accurate. On top of that it gets rid of the honeycomb and restriction of the stock maf.

On top of all that it looks impressive as hell.
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I talked to BiggTimm as well:

Also BiggTimm has one by Nick and he said it makes the turbo crazy loud which makes it sound really cool and mean and he said it makes your car sound like it's going to jump up and turn into the hulk and assrape all cars within a 2 mile radius

ok, ok the last part about hulk I added, but it adds to the story... <!-- / message --><!-- sig -->

Funny s***.. good write up...