What are you guys seeing for kpa at WOT? Is 85kpa max normal?
04-22-2014, 11:19 PM
#1
What are you guys seeing for kpa at WOT? Is 85kpa max normal? I've ditched the MAF a long time ago and run a custom 1 bar SD tune. But I noticed that the highest I can go is 85 kpa. Just wondering if thats normal or if anyone is going higher. If that seems low then do you think a 90mm FAST and 90mm NW TB would cause this or be too small?
04-23-2014, 12:48 AM
#4
I guess i should mention I'm in el paso, tx. The elevation here is 3,800-3,900 ft. And the track i run at in Clint, tx is even higher. Think that could be it? A lot of guys tell me my 11.5 1/4 mile times could be a 10.9 at a better elevation. Maybe the thin air is why I'm only seeing 85 kpa?
Last edited by Jc803; 04-23-2014 at 12:54 AM.
04-23-2014, 01:58 AM
#5
I guess i should mention I'm in el paso, tx. The elevation here is 3,800-3,900 ft. And the track i run at in Clint, tx is even higher. Think that could be it? A lot of guys tell me my 11.5 1/4 mile times could be a 10.9 at a better elevation. Maybe the thin air is why I'm only seeing 85 kpa?
Yes it matters. :-)
At sea level I get 99-100kPa. At speed I get about 102kPa but my setup is a little more free flowing than most. When I drive to Amsterdam my MAP actually pegs due to being below sea level.
Turbo equals altitude compensation device!
Last edited by Exidous; 04-23-2014 at 02:06 AM.
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04-23-2014, 11:14 AM
#8
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What you can do anything about, is the difference
between BARO and MAP (the pressure dropped between
the great outdoors, and the intake manifold plenum).
85kPa KOEO and 84kPa WOT@6500RPM, you're good.
Nothing but about a percent left on the table.
95kPa KOEO and 85kPa WOT, you've got restrictions
that are well worth chasing out. Begin with throttle
cable draw and blade angle, plenty of F-bodies driving
around that don't make full open, matted. Then look to
MAF screen, dirty air filter and so on.
Now, a very good exhaust, heads and cam will make
the motor more able to draw down against the inlet
tract restriction-stackup, no matter how good that
may be. This would be a good problem to have.
between BARO and MAP (the pressure dropped between
the great outdoors, and the intake manifold plenum).
85kPa KOEO and 84kPa WOT@6500RPM, you're good.
Nothing but about a percent left on the table.
95kPa KOEO and 85kPa WOT, you've got restrictions
that are well worth chasing out. Begin with throttle
cable draw and blade angle, plenty of F-bodies driving
around that don't make full open, matted. Then look to
MAF screen, dirty air filter and so on.
Now, a very good exhaust, heads and cam will make
the motor more able to draw down against the inlet
tract restriction-stackup, no matter how good that
may be. This would be a good problem to have.
04-23-2014, 11:31 AM
#9
In theory, with a "ram air" hood... you can see greater than atmospheric pressure. I don't know that there are many real world examples to support the claim but wouldn't it be cool if it actually worked!
04-23-2014, 12:55 PM
#10
Thanks for the ideas guys. Never thought of checking it with engine off. I'll do that when i get home.
I don't have the maf, running speed density, no air filter (only at track) ws6 hood and slp lid, fast intake, AFR 225 heads, Kooks 1 7/8 LT's, Kooks Y, and LM1 cat back. So there shouldn't be any restrictions. But like i said I'll check the MAP reading with engine off when i get home
I don't have the maf, running speed density, no air filter (only at track) ws6 hood and slp lid, fast intake, AFR 225 heads, Kooks 1 7/8 LT's, Kooks Y, and LM1 cat back. So there shouldn't be any restrictions. But like i said I'll check the MAP reading with engine off when i get home
04-24-2014, 10:24 PM
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I guess i should mention I'm in el paso, tx. The elevation here is 3,800-3,900 ft. And the track i run at in Clint, tx is even higher. Think that could be it? A lot of guys tell me my 11.5 1/4 mile times could be a 10.9 at a better elevation. Maybe the thin air is why I'm only seeing 85 kpa?
