Stock turbo and boost controller

[clean96GST]

So I have a stock turbo in my automatic (not for long) 96 GS-T and I am getting like 12 pounds of boost right now. How much can I safely run on my stock turbo and what is a good cheap boost controller?

 

[clean96GST]

eBay Motors: d2power electronic Dual stage boost controller USA SPL (item 330256906968 end time Jul-30-08 20:19:06 PDT) does this look ok?

 

[1990gsx1781]

eBay Motors: d2power electronic Dual stage boost controller USA SPL (item 330256906968 end time Jul-30-08 20:19:06 PDT) does this look ok?

my friend has that one works good

 

[95talon07]

if i were u i would keep boost stock. The t-25 is already pretty much at its limit.
And dont waste your money on that controller. I personaly dont trust ebay, but it just looks like plain crap.
etremepsi.com has halman manual boost controller for like 80 bucks shipped, buy that if anythin at all

 

[JusMX141]

My experience with eBay MBC's are that they are quite touchy and never accurate. You'll turn the knob in 1/4 turn in one instance and the boost will go up 2psi....so you turn it 1/8 turn thinking it'll raise 1psi, but it goes up 3 or 4. I don't have the time or the patience for inconsistency like that.

By raising the boost on a T25 the car's not going to feel too much faster. One problem is that the turbo will not hold that number to redline because the engine will demand more boost than the turbo can make.

A long, long time ago my close buddy tried running 18psi on his T25 before we removed it. The boost would jump to 18psi right away, but by 5000rpms the boost fell to 14-15psi. Big spikes / drops like that are a tuning nightmare....it may spike high for a split second, run a tiny bit lean and get a couple counts of knock, then the ECU will yank timing until you let off the throttle. Right there's how 18psi will end up being slower (and more harmful) than 12psi.

I would just leave it alone until you upgrade the turbo and / or fuel system.

 

[clean96GST]

Alright guys i will just stay at 12

 

[95talon07]

Just buy a 14b, stock 1g turbo, my buddies running 18 lbs on that right now. it been that way for about 3 months. but he has supporting mods that you may not have. walbro, afr, ect.

 

[MrBoxx]

If you don't have a logger or supporting fuel mods, leave the boost where it is. We CANNOT tell you what is "SAFE" for your car. 12psi on your car might create 25 counts of knock, whereas 12psi on an identical car to yours might not create any knock at all. Get a logger, take some datalogs, analyze the information it gives you, and you'll be able to make an educated guess as to what you can safely do. Anything we could say otherwise would just be uneducated guesses.

 

[lq1driver]

14b pulled hard to redline no boost drop 18psi on stock fuel system no knock and i ran 13.9 like that on the street i took my buddies evoIII 16g spyder. mustang gts all day ect. and a joe p mbc

 

[sirspoolalot]

im buying a 92 TSI that's completely stock and i was wondering if i should replace the T25 with another T25 because it has 170,000 miles on it. I don't have the money right now to buy a bigger turbo, as i won't be able to buy the supporting mods

 

[GRAVEDIGGER]

^^^ If it ain't broke, don't fix it. If it boosts good and doesn't smoke or anything then leave it alone.

 

[JusMX141]

im buying a 92 TSI that's completely stock and i was wondering if i should replace the T25 with another T25 because it has 170,000 miles on it. I don't have the money right now to buy a bigger turbo, as i won't be able to buy the supporting mods

Your car doesn't have a T25- it'll have a 13G if it's an auto, or a 14B if it's a manual. Both of those turbos are built by Mitsu and are 100 times more reliable than the T25.

 

[sirspoolalot]

ok cool. Thanks for the info guys