Stock boost levels

[Bubba9110]

Ok so I've heard a few different things about the stock boost levels. First I've read that the 1G's are at 11psi stock on the 14b and that the 2G's are at 14psi on the T25. I've also read from users posting that the stock boost level for the 2G is at 10psi. So I'm wondering which of these is true. Also the T25 maxes out at 15psi correct? If so is there really any reason to use a boost controller to put it up to the 15osi if it's already at 14psi? I'm not sure how much of a difference one psi makes but it doesn't seem like it'd make a lot. If you guys could shed some light on this that'd be great. You've always been amazing help before so I don't doubt you guys on this one

 

[laser92DSM]

I'm not to sure about the 2g stock levels but the stock 1g is about 7 psi that is what it said on my autometer boost gauge when my car was all stock. I don't think that the stock level for a 2g would be 14 psi I think 10 is about right.

 

[esoteric]

I have heard the stock t25 is pretty much maxed out in 2g's not sure what boost it makes but that might help.

 

[Zdrummer15]

2g's were set at 14.1psi from the factory I believe. This does not mean when you install an aftermarket boost gauge, that you will actually see that initially or ever without upgrading some things. For one, the stock bov only holds around 12psi before it starts leaking.

 

[Ryan4dc]

My boost control solenoid isn't connected in my 2g talon and it flutters around 8 psi on the 16g. I need a boost controller to get it back up to 14 psi. I think the oem boost controller might not be hooker up either if yours only went to 10 psi on your 2g.

 

[esoteric]

2g's were set at 14.1psi from the factory I believe. This does not mean when you install an aftermarket boost gauge, that you will actually see that initially or ever without upgrading some things. For one, the stock bov only holds around 12psi before it starts leaking.

Don't stock BOV's hold even less with wear? I thought they leaked around 8 in most cases.

 

[Red4G63]

11.1 for 1G 13.1 for 2G

 

[97gst_707]

Stock 2g is @8-10psi depending on how accurate your boost gauge is. I installed my boost gauge before my mbc and it was at 10psi.

 

[Aproductions]

Stock 2g is @8-10psi depending on how accurate your boost gauge is. I installed my boost gauge before my mbc and it was at 10psi.

same with my 99

 

[Bubba9110]

Ok so I just hooked a boost gauge to it yesterday that was fun... made it with a buddy but it works like a charm. Anyways... it read @ 10psi for me under full boost. Now I understand how horrid the stock gauge is. I mean it doesn't really engage boost until the stock gauge is almost all the way to the top so yeah... is it true the T25 maxes @ 15psi or can it go higher? And what kind of increase in performance would one expect from that? eg; faster acceleration, more horsepower, more torque, etc.

 

[_97tsiawd_]

My first DSM was a 97 TSI and 10 psi is what I had stock... I would not turn the t-25 up past 13 or 14 with a MBC, you may be fine for a while but them bad things could start to happen. I was a total newb back then and had it set @ 16 for no longer then two months of regular driving when my turbo started smoking horribly and I had to replace it. Before I turned the boost up I had NO shaft play, after I had TONS.

 

[hhuricane]

1G=7-11 PSI, 2G=6.4-14.7 PSI. According to the service manuals.

 

[Bubba9110]

My first DSM was a 97 TSI and 10 psi is what I had stock... I would not turn the t-25 up past 13 or 14 with a MBC, you may be fine for a while but them bad things could start to happen. I was a total newb back then and had it set @ 16 for no longer then two months of regular driving when my turbo started smoking horribly and I had to replace it. Before I turned the boost up I had NO shaft play, after I had TONS.

So it's not suggested to turn the boost up then? I thought it was ok if you did it safely but it'll probably break soon if i do turn it up?

 

[Aproductions]

bought my 99 gst stock with 42000 miles last year, now I have 53000 and my turbo had no shaft play and I put it at 15 lbs for a few months and now the shaft play is pretty bad.

Also the reason you don't wanna go over 15 psi on a t25 is because after that it just flows hot air and you don't really get any more power out of it.

Its not always about psi its actually about airflow

My first DSM was a 97 TSI and 10 psi is what I had stock... I would not turn the t-25 up past 13 or 14 with a MBC, you may be fine for a while but them bad things could start to happen. I was a total newb back then and had it set @ 16 for no longer then two months of regular driving when my turbo started smoking horribly and I had to replace it. Before I turned the boost up I had NO shaft play, after I had TONS.

so I agree with him and I would put it at 13psi....later in the future, buy something bigger like a 16g and get a fuelpump and injectors and dsmlink or ecuflash

 

[Bubba9110]

Ok sounds good to me. I was just wondering about it since I'm sort of new to this. I do plan on going with a big 16g or HX35 in the future so I'll definitely take all this into mind. Thanks again guys.

 

[my dreamt dsm]

Stock 2g is @8-10psi depending on how accurate your boost gauge is. I installed my boost gauge before my mbc and it was at 10psi.

To add more info... yes, me also. Before my mbc install I was hitting 10 psi stock.
And no, t25 does not max out at 15psi. It's inefficient after 15 psi but I've seen people turn it up to 17psi with supporting mods. But that's just crazy in my opinion.

 

[slickers111]

Ive seen the T-25 hit 21 PSI.
But I would run 14 PSI

 

[Bubba9110]

Alrighty. I'll try 13 or 14 psi then and see how that goes. Also I was wondering would hard IC piping help with the boost? I read that it can help with spool up time but I don't know if that's right or not.

Ok one last question would the MBC be better placed at the blue arrow or the red arrow? I think from what I read it's better for it to be at the red arrow but I'm not sure. Thanks again for all your help. I'm just trying to get an understanding of all this stuff before attempting any of it.

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[boosted99_420]

ive always went by 12 psi on the 2gen and 10psi on 1st gen (5 speeds) but im not sure.

 

[highlandgst]

i hooked mine up at I was running about 10 psi stock ...

 

[Aproductions]

Ok one last question would the MBC be better placed at the blue arrow or the red arrow? I think from what I read it's better for it to be at the red arrow but I'm not sure. Thanks again for all your help. I'm just trying to get an understanding of all this stuff before attempting any of it.

for this you wanna take all that junk out(the picture with the blue and red lines) and cap off the 2 ports they come from(under the intake...its a seloniod thing, I forget the name)...then go from the turbo nipple on the t25 to the mbc and then the mbc to the wastegate nipple.





mount the mbc somewhere close, the shorter the lines, the better.


and yeah the metal intercooler pipes will help because the old ones can leak pretty easy and i bet they have oil in them

 

[Bubba9110]

Ok sweet! that helped a lot. So would a cheapo ebay hard IC pipe kit work for a replacement or is there a certain kit that works well for our cars? I want to replace my IC piping but I don't want to pay $250 for a kit that says Greddy or HKS on it, know what I mean? So yeah thanks!

 

[BLINKY619]

mine only boosted 9psi...

 

[TJCTalon]

Currently on my stock 2g (except BOV and injen intake) my boost gauge reads 12 psi

But yes the t-2small is not very efficient past 15-16 psi.

 

[Bubba9110]

Sorry to bring this back but I figured I'd post here to keep things orderly and because it's along the same line. So I made a MBC and drilled that small hole in the side because it was leak free amazingly. So I installed it and I haven't tested it yet but i Was wondering What happens if i do not cap off the boost solenoid? Also now that I'll be running @ 14 psi will the turbo spool slower or faster or will it just stay the same? Also I'm still looking for a suggestion on a hard IC pipe kit for cheap. I've seen some eBay ones but would these suffice? If someone could point me to a decent kit that doesn't cost much that'd be great Thanks again guys for all your help... I've always gotten the answers and learned a lot