Quick (stupid) question...

[uranium-238]

What should I be seeing for max boost on a stock redline? 15 psi is all I normally see.

[klipper]

Originally Posted by uranium-238

What should I be seeing for max boost on a stock redline? 15 psi is all I normally see.

Mine varies greatly. There are some technical factors that go into it, etc. But i'm seeing anywhere between 16-18 psi consistently.

[MaverickFlash]

On average i've seen 16-20 peak 22. Like Klipper said, many things go into it.

[08SkyLdr]

Prior to the BSR tune, my top end was 18 psi.

[cfjara]

it will vary based on atmospheric pressure ( high elevation vs. low) and ambient temp.
Prior to BSR i beleive the highest I ever saw i go was about 18. Most of the time around 16.

[G8TR]

Average is normally around 16 on most cars. Some get 17 or 18, depending on conditions. With tunes it can easily reach 21-22.

[uranium-238]

Well, elevation around here is all easily within 200' of sea level. Heck, the last part of my commute to work is along the bank of the Chesapeake Bay. Temperatures are all over, but it's been nice lately, in the mid-upper 70's during the day, and mid-upper 50's at night.

So, basically I'm starting to think I might want to go and make sure all the ductwork in the engine is tightened down good.

[TulsaSky]

On a step hill starting out in second I actually hit 18 before hitting 85 and the top of the hill, so yes I can believe that some have hit 22 PSI on the boost at the track, but for all of us civil drivers in town with police nearby its a rare occasion to hit 16. Take it in but I would wager money they will find nothing wrong. Like most of the post suggested it all depends on the conditions of the road, air temperature and how hard your pushing (speed) of the Sky. Also the PSI boost is just a gage it is not reflecting how fast or hard the Sky is throwing you back in the seat, you would be wise to watch you speed and not the PSI gauge.


TulsaSky

[uranium-238]

Oh I'm not taking it in, I'm taking a wrench to the clamps. I don't plan on taking the car in for any warranty stuff unless it's more than $150 to fix on my own, or a known bad part. (like the cupholder...)

I've always done all the work on my cars.

[Booster_RL]

I'm in the same geographical area as you and I can get out to 20 if I just pounce on it generally though I'm seeing 17-18 when I'm in the sweet spot.

[uranium-238]

Originally Posted by Booster_RL

I'm in the same geographical area as you and I can get out to 20 if I just pounce on it generally though I'm seeing 17-18 when I'm in the sweet spot.

Even 17 is more than I normally see. I'm gonna go check my clamps right now while I'm thinking about it.

[uranium-238]

Just a quick follow-up. I've since checked all but two of the clamps, the one I missed were on the intercooler inlet/outlet and were in a place I couldn't reach. But, I was able to tighten the other two clamps on those locations. I thought it interesting that they'd doubled up on the clamps on the intercooler, but not anywhere else.

Anyway, all the cheap clamps (not the big beefy ones.) were loose. Tightened them up, now I'm seeing a pound or two more of boost. The clamp on the intake manifold was very loose, that's probably the one causing me to lose pressure.

So, bottom line, check the clamps on the air lines.

[DURAMAX]

My car is not a RL but my PU has a turbo. I made an adapter that clamps on the intake side of the turbo and hooks to regulated air. With the engine warmed up you can get pressure in the tubes. The best way to check for leaks is propane system leak detector. Get it at RV stores. Bubbles up with the tiniest leak. Do not exceed the max boost with your air pressure. I set my regulator to 40psi but its a diesel and it makes that much boost. I do this every 10,000 miles and at least 1 clamp will be leaking a little. Diesels have more vibration and boost so that may contribute to the problem.

[Rob the Elder]

Normal unmodified is 16 peak. The air density is a factor. For low air density conditions, the EMS packs in a bit more boost. Before I changed my pipes, exhaust and intercooler I used to see 15 - 16 with occasional 17 under full load conditions. Since the changes I see 17- 18 under the same conditions.

But there are really two factors to consider. One is the peak number and the other is the rate at which it achieves higher boost numbers. One of the things a "tune" does is allow both an increase in the peak values but as important it allows reaching higher levels of boost at lower RMP - more quickly. Its like the peak number represents the height of the curve, while the rate represents the area under the curve. If the area under the curve remains the same, then having a higher boost number later is not doing you a lot of good. A lower number achieved earlier is better in fact.

[uranium-238]

Regardless, 15 is lower than most people are seeing, and the clamps were loose.

[mbeardsley]

Can you give us a picture of where these loose clamps are?

(for those of us who know little about the actual inner workings of the engine)

Thanks.

[uranium-238]

I'll try to when I get home. I just started at the air box, then followed the lines to the turbo, intercooler then intake maifold.

[pudge3us]

Originally Posted by uranium-238

Just a quick follow-up. I've since checked all but two of the clamps, the one I missed were on the intercooler inlet/outlet and were in a place I couldn't reach. But, I was able to tighten the other two clamps on those locations. I thought it interesting that they'd doubled up on the clamps on the intercooler, but not anywhere else.

Anyway, all the cheap clamps (not the big beefy ones.) were loose. Tightened them up, now I'm seeing a pound or two more of boost. The clamp on the intake manifold was very loose, that's probably the one causing me to lose pressure.

So, bottom line, check the clamps on the air lines.

Wow!! I couldn't tell ya what my boost would be......heck I am just hanging on and going thru the gears. I have the RL turbo which if I am not mistaken, if you have an RL it is a turbo? Yes? No? But like I said.......I don't have time to look at my boost. Sorry.

[smokinu]

UM I am a little worried then. I just picked up my Sky rl this weekend and while I was driving about 20 mph I punched it and the boost gague went all the way to 21 psi. So what is the deal, is something screwed up with the gague?

[G8TR]

Originally Posted by smokinu

UM I am a little worried then. I just picked up my Sky rl this weekend and while I was driving about 20 mph I punched it and the boost gague went all the way to 21 psi. So what is the deal, is something screwed up with the gague?

That's pretty amazing if you got 21 out of a stock RL. It's not unheard of, under optimum conditions there is always that pressure as a possibility.

[Darkwing]

I've seen mine bump 20 psi, although it is rare.

[SkyHigh07]

if your looking for more boost? theres some good tunes out there..i get 23lbs boost ,361lbs torque at flywheel

[DeepBlueGXP]

uranium-238, you should replace the two clamps on the drivers side just prior to going into the intake manifold. 3" T-Bolt clamps. If you need assistance replacing them, come over. Those clamps will continue to loosen. Also, the ECM learns your driving habbits and after a while you won't see much boost. You can reset the fuel trims (from your habbits) by pulling fuses 42/43 under the hood, wait a few minutes and reinstall them. You should then see 18-19 boost until it learns again. If you don't have the money for the tune, do the waste gate rod mod.

DBG