Engine modifications:
- CAI
- M45 Supercharger kit
- 175,800 miles of driving
2.8" pulley: 3-4 PSI
2.7" pulley: 4-5 PSI
2.6" pulley: 5-6 PSI
My gauge reads correctly, high quality (boost is in digital). Track times confirm this, as well.
What could be the culprit of causing such low boost?
- high mileage
- manifold bolts not torqued fully
- FPR/boost side nozzle off the supercharger not sealing under boost thus leakage
- boost gauge not sealing under boost thus leakage
How would I go about checking for a boost leak anyhow? Hope my actuator isn't one of the fubar'd ones.
2001 Olds Alero (LD9)
650 whp / 543 ft-lb
@turboalero
Have you dynoed it before?
Also, do you have any internal mods?
-
"Youth in Asia"...I don't see anything wrong with that.
Never dynoed, track's all that matters to me. 15.4 @ 87.0MPH or 15.0 @ 89.3MPH (corrected) with no traction off the line at 4PSI on a warm evening.
I listed my engine modifications above. That is all I have for engine mods. No, I do not have a ported head or manifold, lol. I'm curious why my supercharger does not pressurize as much as 90% of others.
2001 Olds Alero (LD9)
650 whp / 543 ft-lb
@turboalero
Was the charger purchased as a new unit or bought used from someone? I swapped out to a newer s/c a few months back and gained 2-3 psi.
14.330 @ 96.37mph
New from CrateEngineDepot, kit brand new in packaging, didn't look like it was used. Maybe your old s/c had the actuator problem and the newer doesn't. Meh
2001 Olds Alero (LD9)
650 whp / 543 ft-lb
@turboalero
swap some. 10-1 pistons. in their that will make it all beeter.
Never trust a single guage no matter who makes it, Go find a VDO Manual Boost guage and cross it with that.
Check for blow back, your piston rings could be worn,
Also what is a "corrected" track time?
From what Iv'eseen most Z24s run around 14.5 - 14.7 with the m45, you car is much heavier and your running 15 flat, seems close to me, what does your car run stock, high 15s? Give us the full track slip, what are your IATs at the track ???
[ion wrote: C2]Engine modifications:
- CAI
- M45 Supercharger kit
- 175,800 miles of driving
2.8" pulley: 3-4 PSI
2.7" pulley: 4-5 PSI
2.6" pulley: 5-6 PSI
My gauge reads correctly, high quality (boost is in digital). Track times confirm this, as well.
What could be the culprit of causing such low boost?
- high mileage
- manifold bolts not torqued fully
- FPR/boost side nozzle off the supercharger not sealing under boost thus leakage
- boost gauge not sealing under boost thus leakage
How would I go about checking for a boost leak anyhow? Hope my actuator isn't one of the fubar'd ones.
___________________________________________________________________
Mitsu TD06-20g |3" Downpipe w/ Cutout | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |
The corrected time is the 15.4 @ 87MPH timeslip multiplied by a correction factor based on the altitude, density, temperature, etc. It says under ideal conditions I'd have run a 15.0.
Most j-bodies run 14.5-14.7 manual, with the stock pulley at 4.5 - 5 PSI. When I was at the track I saw 4 PSI on the 2.7" pulley. I also have automatic. I've never been to the track stock, but I've seen all between 15.9 and 16.7, auto.
How do I check for blow back?
2001 Olds Alero (LD9)
650 whp / 543 ft-lb
@turboalero
[ion wrote: C2]The corrected time is the 15.4 @ 87MPH timeslip multiplied by a correction factor based on the altitude, density, temperature, etc. It says under ideal conditions I'd have run a 15.0.
Most j-bodies run 14.5-14.7 manual, with the stock pulley at 4.5 - 5 PSI. When I was at the track I saw 4 PSI on the 2.7" pulley. I also have automatic. I've never been to the track stock, but I've seen all between 15.9 and 16.7, auto.
How do I check for blow back?
Take an in-line air filter for an pneumatic airline and splice it into the hose coming off your valve cover, or spend some money and get a catchcan, also do a cylinder compression test.
___________________________________________________________________
Mitsu TD06-20g |3" Downpipe w/ Cutout | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |
One of the vacuum hoses, the one that goes to the PCV baffle, (crankcase breather?) noticed it fills up with oil and crap, (got it linked to the air intake which sucks it back through) That blow by?
2001 Olds Alero (LD9)
650 whp / 543 ft-lb
@turboalero
[ion wrote: C2]One of the vacuum hoses, the one that goes to the PCV baffle, (crankcase breather?) noticed it fills up with oil and crap, (got it linked to the air intake which sucks it back through) That blow by?
bingo, time for compression test
___________________________________________________________________
Mitsu TD06-20g |3" Downpipe w/ Cutout | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |
So it's probably not a good thing to be boosting with worn rings, huh.. hopefully the engine lasts until I can get the new rods/bearings/rings in.
2001 Olds Alero (LD9)
650 whp / 543 ft-lb
@turboalero
The only problem you will have is more blow by and more oil in your intake. You might want to route that hose to a catch can even something homemade will work. It depends on if it is bad enough to warrant doing that. Even brand new engines have some blow by.
FORGET GIRLS GONE WILD WE HAVE GOVERNMENT SPENDING GONE WILD!
^That's what a few of the knowledgeable boosted guys on Aleromod said. Good to know. A rebuild's on its way soon anyway. Thanks for the information all
2001 Olds Alero (LD9)
650 whp / 543 ft-lb
@turboalero
Just wondering how you "pulled real hard" on that SS/SC on Xceedspeed with a 15.4?
Don't know. Read the thread, he probably started in 5th, or let off, lol. Guess I should have gotten a video.
2001 Olds Alero (LD9)
650 whp / 543 ft-lb
@turboalero
I'd say it's time to buy a header and full 2.5" exhaust. Your choking the @!#$ out of it with that junk stock manifold, and the exhaust is far from ideal.
You might pull higher boost just by doing that.
My friend said that, however I don't quite understand how making the exhaust freer flowing would increase the pressure, lol.
2001 Olds Alero (LD9)
650 whp / 543 ft-lb
@turboalero
what goes in must come out somehow. the easier it can get out efficiently than the easier it can draw more in.
87 Firebird
All stock...........lol.
well a catch can is a good idea, hell i dont run one and i have some blow by in that hose and intake mani but not too much and im running consistant 14.0-14.1 with low compression on s/c
, losing fuel on stock pump and a choppy tune. Do like i did before i had a wrist pin knocking, run her til she knocks or blows. You already have the current motor in there so why rebuild it if its still running fine? just my 2 cents.
kflo wrote:I'd say it's time to buy a header and full 2.5" exhaust. Your choking the @!#$ out of it with that junk stock manifold, and the exhaust is far from ideal.
You might pull higher boost just by doing that.
lets not put the horse before the carrage. if that motor is gone bad bolt ons will do nothing but take money away from the new motor he needs
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Those so naive, so hard headed, so narcissistic, that think that buy their own efforts can single handedly change the world, are always the ones that do.
I know, and I understand that, but really it's no horse before the carriage. Those mods need to be done too.
