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

 

[Minimalitia]

First this morning on the way to work i hit fuel cut at 12 lbs. the lowest ive had yet. also where is the compressor/j-pipe ?

 

[zippyshoe]

First this morning on the way to work i hit fuel cut at 12 lbs. the lowest ive had yet. also where is the compressor/j-pipe ?

The j-pipe should be located near you turbo (near the inlet). There should be a large hose running between the j-pipe and your intercooler. There should also be a vacuum port on your j-pipe. I believe this is true on 1G's, but I'm more familiar with the 2G setup. Run a vacuum line directly between this vacuum port on your j-pipe and the vacuum port on your wastegate actuator.

Also, you should not be hitting fuel cut at only 12 lbs., unless you have a huge boost leak.

 

[92fasttalon]

Cold side/ pipe off the turbo!

 

[Minimalitia]

Cold side/ pipe off the turbo!

what do u mean by this?

 

[fwdeclipse]

If you are hitting fuel cut at 12psi you almost no matter what have a boost leak.

 

[iboostdoyou]

yea 12 is rediculous. Something is VERY wrong. Do a boost leak test and solve that one first. Then move onto larger more expensive options .... The Jpipe is the pipe that curves above your turbo and connects to the lower intercooler pipe from the inlet side of the turbo (the part that the intake connects to). Dont even ask how to do a boost leak test, search, spend the money and get it done. Do not keep driving your car like this or we will be reading another one of those "melted piston" threads. If you MUST drive your car, for the love of god stop going WOT or redlining the car. Baby it until you can get it fixed

 

[boostinaintez]

wow that is high.

 

[beatshack]

Yeah I was going to say, if you are spooling that late, and also hitting fuel cut, that sounds like a boost leak to me. Do a boost leak test, fix your leaks, and you should be spooling around 2,000 rpm and hitting 10 psi by around 2500 rpm in a 3rd gear pull.

 

[Minimalitia]

Alright ill do a boost leak test as soon as it stops raining and hailing and ill driving like a bat out of hell so much. Also though, 12 lbs was the lowest its ever had fuel cut. That was a pretty cold day. The warmer it is the more boost i get without fuel cut. And one more thing, when my car does spool up it pulls hard, I mean it puts ## head in the seat hard. Would it pull so hard if there was a massive boost leak?

 

[beatshack]

Yep. But it will pull harder once you fix the boost leaks and your ecu is giving the correct amount of fuel for the amount of air the MAS is seeing. With boost leaks you're losing air that is un-accounted for, causing you to run rich. And yes, you will hit fuel cut faster on a cold day (In minus 15* celcius weather, with boost leaks, I hit 95% injector duty cycle on just 10psi of boost).

 

[Minimalitia]

Hey in my last post in here it put in 2 # signs rite before the word head. Why did it do that? I typed in the word "your". Thats like the second time its happened to me.

 

[4geze63]

Faze are cheap shit gauges, I wouldnt trust them.

 

[reveal1123]

It's like which weighs more, a ton or lead or a ton of feathers.

haha.. some funny shit

 

[Stez]

Hi everyone, may be i should ask this question in the newby forum, but anyway...
So, can anybody tell me from own experiance, how much boost can be run on the stock engine internals?? without water injection and with water injection???

PS: with t3/t04b turbo, good front mount intercooler, external wastegate, MAP system, good intake system, 680 cc injectors, AFPR, fuel pump and so on.....

 

[nukefission]

Stock head bolts/headgasket or ARP studs? 30 psi is possible with a conservative tune if you have ARPs, otherwise I wouldn't venture above 20-25 psi. I'm paranoid though.

 

[rhamlinii]

I know of a guy from Virginia that had a frank 7 on his car. The bottum end held together for some 10sec time slips, with 35psi. He couldn't over power the rods, and with a good tune it's possible for it to be reliable too. I myself have not seen over 27psi.

 

[Stez]

I meant stock head, bolts, gasket, pistons, rods, valves, shafts ..... (the balance shafts were eliminated)

 

[99gst_racer]

nukefission's estimates sound fairly accurate. I have a stock composite HG with stock head bolts and I run my 50-trim at 22 psi daily. But if I ever venture above 22 psi, I would first switch to ARP head studs.

Also, keep in mind that you have stronger rods and lower compression pistons than 2G's. You could probably afford to run even a little more boost than me, of course, this is all assuming that you have a proper engine tune.

 

[Stez]

yes, of coarse, this is all assuming that i will have a proper engine tune!
and yes, i forgot to mention, i have 6-bolt engine.

 

[turbodsm18]

I ran 22 psi on a 16g with a crappy tune and it held up for a good while. That was also a 7 bolt motor so you can go higher than that as long as you got the fuel to support it.

 

[daren_p]

I ran 22 psi on a 16g with a crappy tune and it held up for a good while. That was also a 7 bolt motor so you can go higher than that as long as you got the fuel to support it.

Held up for a good while, does that mean something did go wrong though? If so what happend and what was the cause? Im putting in ARP head studs to run 20 or so psi this summer, looks like Im a little cautious though

 

[Coup D E'Tat]

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

 

[CanadianTSi]

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

 

[Stez]

Well, probably something like 25 psi for my setup with proper fuel support will be a good choice...

 

[turbodsm18]

It held up until I leaned it out and melted my #2 piston, HG and rods were in perfect shape though.