Stock Boost [Merged 5-7]

[Gs-tHaVoC]

hehe kinda dumb question but whats stock boost on my car? just wondering if its worth it to install a boost controller and gauge without bov thats all. thanx

 

[TsiTalon9587]

I can't believe in the 10 or so replies that no one mentioned what you should really consider; The amount of air that is being flowed, or, how much air you are really pushing through the engine. You can't base an engines' limits on boost alone. You have to consider it's limit in horsepower, which is directly correlated to airflow.

Granted boost is important, but not nearly as much as airflow (in a mass per time measurement; IE: lbs/min)

However, assuming that your fuel system is doing what it is supposed to; You can flow up to ~50 lbs/min of air, and thats limited by your injectors. This also assumes an 11:1 A/F ratio, as well as .76 sg (pump gas). You don't mention which pump you have, but if you have a 190, I would be careful.

I hope this helps.

 

[99gst_racer]

I can't believe in the 10 or so replies that no one mentioned what you should really consider; The amount of air that is being flowed, or, how much air you are really pushing through the engine. You can't base an engines' limits on boost alone. You have to consider it's limit in horsepower, which is directly correlated to airflow.

First post.... "t3/t04b turbo". If you know the size of the turbo and the amount of set boost pressure, you can easily determine a rough estimate of airflow. Most people are recommending to run 20-25 PSI and on that turbo, that should net roughly 38-44 lbs/min, which should work just fine for his engine.

 

[TsiTalon9587]

First post.... "t3/t04b turbo". If you know the size of the turbo and the amount of set boost pressure, you can easily determine a rough estimate of airflow. Most people are recommending to run 20-25 PSI and on that turbo, that should net roughly 38-44 lbs/min, which should work just fine for his engine.

Well then why didn't you say exactly this in your first post?

 

[turbospd]

What do you all thing of boost on a stock motor. Ill i would plan on doing is manual boost controller, bov, and bosst gauge. What would you run at your highest. I dont have alot of money to be fixing anything so i dont wanna be blowing anything up but what would you think would be the highest and safest on stock?

 

[VelocitàPaola]

Keep it at around 15 psi. Everyone has their own opinions on this though, look around the forums and find which one makes the most sense to you.

 

[robs90tsi]

Im a very cautious kinda guy, so unless you have a EGT gauge to monitor the.....well, EGT, I would keep it at like 13, no more, but thats just me, I dont like to keep my car on the edge.

 

[megadeth0]

Are you still running a stock 14B turbo? I ran my B16G at 15 PSI and had no problems. With a couple bottles of octane boost, I ran 18. Later on I put on Alcohol injection and ran 20 PSI whenever I raced with no problems. If your still on a 14B, you should be fine anywhere between 15 and 18 with good gas. Don't go any higher though. But that's not because of the motor, it is due to lack of fuel. Stock internals will handle a lot of power and boost.

 

[Stez]

yes, i don't remeber for sure but the higher level of my turbo i guess something about 49 lbs/min, therefore, if talking about airflow, 38 - 44 lbs/min probably will be a perfect working range for this turbo and 20 - 25 psi is a good boost

 

[Ultimatedsm]

I wouldn't boost more then 24 PSI period unless you want to lift the head. I know people that blew headgaskets after 23 psi of boost. It is pretty risky to run over 22 psi unless you have ARP bolts etc. With over 23 psi boost, 91 octane will be adequate, you will be mixing it some kind of race gas or get at least an octane rating of 94 in there. In canada we get 94 here so its ok for us .

 

[Stez]

here in Ukraine, we have 95 octane for dayli driving and i will use 98 for boost, in our county almost everythere we can buy it (98) but there is 1 minus - quality.... unfortunetly it could be better....

 

[Stez]

Concerning the ARP head studs - can anybody tell me, are this stud should to be tighten with force stated in the 1G MANUAL for head studs or some bigger force?...

and maybe there is some sence to tighten stock studs stronger??

 

[99gst_racer]

Well then why didn't you say exactly this in your first post?

Because I figured it was safe to assume that everyone offering advice in this thread knew that PSI, airflow, and turbo size were all directly related. And if anyone is just guessing a PSI amount without taking into accout for turbo size, airflow numbers, and engine tune, then they shouldn't be posting in here.

 

[Coup D E'Tat]

I ran 25-26 daily (on a 60-1) and pump gas. Car loved it.

Just wanted to mention that this was done using ARP's and a Mitsu. MLS head gasket, and the car saw as high as 30PSI very briefly.

Stez, I torqued my ARP's down to (I believe) 85 ft. lbs. I did this in three steps - 30, 50, and then 85, and did not retorque.

 

[daren_p]

Concerning the ARP head studs - can anybody tell me, are this stud should to be tighten with force stated in the 1G MANUAL for head studs or some bigger force?...

and maybe there is some sence to tighten stock studs stronger??

Im not sure what the 1g torque spec is but I believe the arp torque spec is higher, even when you use their torque lube. They include the torque specs with the studs so you should be set

 

[dsmsucks]

I ran 24psi daily on the stock studs/gasket.

Wow canadiantsi I remember when you first put the 50trim on. Damn the car has held 24psi that long on stock studs and gasket?!!
Thats great

 

[nanokpsi]

I wouldn't boost more then 24 PSI period unless you want to lift the head. I know people that blew headgaskets after 23 psi of boost. It is pretty risky to run over 22 psi unless you have ARP bolts etc. With over 23 psi boost, 91 octane will be adequate, you will be mixing it some kind of race gas or get at least an octane rating of 94 in there. In canada we get 94 here so its ok for us .

It's all in the tune. If you don't have timing control, you won't be running 25psi on pump gas. I have stock studs and gasket and run mid 20s on pump. Over 30psi on c16(no c16 on the t67 yet).

 

[a1320eclipse]

Ok, so i picked up this 90 tsi from a guy that had to get it out of his appartment complex parking lot. i got it for free...just a blown up motor, well the timing belt snapped at 7k in third, so the stock motor was basicaly junk. So i sourced a freshly rebuilt 6 bolt and threw it in. the car runs like an absolute dream. ive got a gutted cat, an intake, hacked maf, and a vr-4 fuel pump. I just was able to pick up a high performance turboxs MBC for $30. im hitting a sold 13psi right now. can i put that on and safely go up to 15psi with no worries? i have plans to do the rest of the normal stuff when tax return comes. ive looked around and couldnt find a definite anser to this question.

 

[megadeth0]

You'll be fine with 15PSI. But don't go any higher untill you get some fuel mods.

 

[FRIZZLE]

Your car will be fine at 15psi.

 

[Booster2k]

yep about 15 psi I had mine at that all stock well fuel pump and rewire cause stock went out. ohh about 80k miles no problems.

 

[leakyfaucet]

This is a question for all 1g owners that installed a boost gauge before a boost controller. Also, please note if you pulled the restrictor out of the boost solenoid. I've heard so many different answers, and I'm interested to see how much variation there really is.

 

[megadeth0]

You will still get a variety of answers. Not all boost guages are completely accurate. More so than the stock one, yes, but to say for sure you need better than most Autometer guages which is what most people have. Mine, stock, was 11PSI.

 

[highboostintsi]

11-12-13 they are all "stock" boost. mine came with a boost gauge and controller. dont push it with out the supporting mods.

 

[Booster-Shot]

Yeah I was about 11psi too.

 

['89beretta]

11 psi here too on an Autometer guage.

I turned it down to stock for the first time in three years over the winter. What a difference from 11 psi to 15 psi.