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Old 02-15-2004, 11:33 PM   #1
WiredWRX
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Default Why So Little Boost

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Last edited by WiredWRX; 06-22-2004 at 05:38 PM.
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Old 02-16-2004, 12:18 AM   #2
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Pink injectors are not your problem.. People have ran 21psi on a FP18G on pump gas with the pink injectors. I dont know about the FP18T holding 22 psi to redline?? Maybe spiking too 22 and then droping off to 17psi at redline..

When are you seeing 17psi? At redline or all the way through the rpm's?

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Old 02-16-2004, 12:47 AM   #3
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Old 02-17-2004, 12:21 AM   #4
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Who did your dyno tune?
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Old 02-17-2004, 12:24 AM   #5
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Old 02-17-2004, 06:02 AM   #6
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Have you asked the tuner in question?

You are paying for the service and you requested something specific (the boost level),. They probably have a good reason not to have set the specified level and they should be no problem telling you, the customer, why it is that they did not set the car up to use your requested boost level. The fact that they did choose not to set your requested level is not necessarily , in itself, a bad thing.
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Old 02-17-2004, 09:51 AM   #7
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Old 02-17-2004, 10:13 AM   #8
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The problem is crappy kali gas....91 ocatane(maybe ) is NOT condusive to high boost.
Just because the turbo will hold xxpsi boost dosen't mean that it can be tuned to that on a car with crap gas.

Pour a couple gallons of toluene or xylene in the tank and see what kinda tune you can get...I guarante it will be better....but then ya gotta run it all the time...
So...junk kali gas is the problem, I'm sure.
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Old 02-17-2004, 04:46 PM   #9
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Old 02-17-2004, 04:51 PM   #10
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17psi on 91 octane out of a 18g seems about right to me. I run 93 octane with 18-19psi on my Sti pinks along with 18g and my injectors are maxed.
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Old 02-18-2004, 01:46 AM   #11
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Sounds like he shot for the safe side of things. 20psi on 91oct with a boost spike would be bad news.
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Old 02-18-2004, 02:40 AM   #12
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Quote:
Originally posted by silverscooby
17psi on 91 octane out of a 18g seems about right to me. I run 93 octane with 18-19psi on my Sti pinks along with 18g and my injectors are maxed.
This is not an 18g. It's an "18T" which is an upgraded stock TD04. Where did you see FP say that you could get 22-24psi from an 18T? Keep in mind there's a BIG difference between an 18g and an 18T (i.e. they're completely different turbochargers). 18g should hold that boost with the right supporting mods but I really doubt the 18T would.
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Old 02-18-2004, 04:09 AM   #13
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Quote:
Originally posted by Macabre
This is not an 18g. It's an "18T" which is an upgraded stock TD04. Where did you see FP say that you could get 22-24psi from an 18T? Keep in mind there's a BIG difference between an 18g and an 18T (i.e. they're completely different turbochargers). 18g should hold that boost with the right supporting mods but I really doubt the 18T would.
Call FP and ask them. They will tell you.

Michael
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Old 02-18-2004, 11:44 AM   #14
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I think they might have misunderstood you as well as there doesn't seem like much chance of getting that much boost out of a TDO4. Call FP back and make sure they understand you're asking about the 18T upgraded stocker and not the 18G.
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Old 02-18-2004, 12:58 PM   #15
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Thanx, but I am sure. Brian at FP and I had several conversation about the turbo, and that was just one of them.

If by chance you still doubt it, give them a call yourself, ask to speak to Brian. He will tell you.

In addition, My coworker spoke with Robert at FP several times about it, and he said the Turbo can hold at least 20

Of course, you could just take my word for it, but if not, give them a call.

Now, assuming the Turbo can handle it, why do you think the tuners aren't giving me the boost.

I know there are people here in SoCal that are running more then 17lbs on pump gas. What are they doing?

Thanx
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Old 02-19-2004, 01:45 AM   #16
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I think you got a good tune and are just expecting too much out of the combination of your hardware and crap gas....I think you should be happy the tuner didn't push too far and give you a tune that's going to fry your motor quick....Just because a turbo will 'do boost' doesn't mean the combination of 'stuff' you have will take it reliably.
There may be a problem somewhere that you are unaware of...look for it.
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Old 02-19-2004, 01:59 AM   #17
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Quote:
Originally posted by Uncle Scotty
I think you got a good tune and are just expecting too much out of the combination of your hardware and crap gas....I think you should be happy the tuner didn't push too far and give you a tune that's going to fry your motor quick....Just because a turbo will 'do boost' doesn't mean the combination of 'stuff' you have will take it reliably.
There may be a problem somewhere that you are unaware of...look for it.
It seems as if I may be mis understood.

I am not complaining in any sense. I am certainly not claiming that I have a bad tune necessarily, unless my current mods should be able to support more. I am curious to know why I am not getting more. If it is a problem with my setup, then what should I change. That is and always has been the questions.

I quote

"With my supporting mods, I should be able to get 19 or 20 lbs, right? DO I need higher flow injectors. Do you think that is holding me back? Is it the stock TMI? What do you think it is?"

So, what do you think it is. If it is gas, I am almost positive there are people here in Cali with crappy gas getting more then 17 lbs of boost. What do they have that I don't.

WHAT AM I MISSING.

Thanx
Michael
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Old 02-19-2004, 02:09 AM   #18
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Quote:
Originally posted by WiredWRX
So, what do you think it is. If it is gas, I am almost positive there are people here in Cali with crappy gas getting more then 17 lbs of boost. What do they have that I don't.

WHAT AM I MISSING.
They have bigger turbochargers. Perhaps the 18T can make a bit more boost, but can it do it with enough efficiency to avoid heating the intake charge enough to cause detonation on 91 octane? Your tuner didn't seem to think so.
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Old 02-20-2004, 02:24 AM   #19
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I'm making 16.5 peak boost with a VF30 on crap cali gas. I have all the supporting mods you have and a few others.

If you want to push those high levels of boost add octane. I am adding alcohol injection to my car to run a nice safe tune hopefully pushing ~18.5psi. In the past I have run toulene to get more boost safely.

You ask what people have to run more boost in Cali?

1.Race Gas, Water Injection, Alcohol Injection, Toulene, Xylene, ETC.

2.Turbos that are designed to run high boost efficently are pretty important also.

3.Larger or trick post-turbo cooling systems(once again, alcohol and water injection come to mind).

4. I'm sure I missed a few things.

I have some serious doubts any modified stocker will run 22 psi efficently...let alone to redline? That sounds so insane to me, have you seen the td04 compressor map? Unless you plan on running aviation fuel or something...idk

Last edited by industrial; 02-20-2004 at 02:31 AM.
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Old 02-20-2004, 12:55 PM   #20
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Thanx for the response.

That was what I was looking for, answers, not bashin of the mods I have done.

As for the modified stocker, it is not the same compressor wheel. That is part of the modification, A larger compressor wheel, and a clipped exhaust wheel.

I didn't make the specs up, I just restated them, I promise .

Thanx
Michael
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