lost 20 whp.. what could have been the problem?
#41
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I doubt weather/dyno variance is much if any factor here. You can see the dyno uses STD corrections which accounts for temp/humidity plus it's a fixed-mass inertial dyno not subject to the huge variances brake based dynos are known for. The gains/losses of his mods should be greater than the dyno variance in any case.
I would take a look at the timing curves before/after the mods. I am definitely seeing some knock retard on those plots. Cams can induce some phantom knock if they are noisey. Try shutting knock control off completely and setting hi and low det maps equal. Also make sure you have a solid 12.5 a/f thru out the pull.
I would take a look at the timing curves before/after the mods. I am definitely seeing some knock retard on those plots. Cams can induce some phantom knock if they are noisey. Try shutting knock control off completely and setting hi and low det maps equal. Also make sure you have a solid 12.5 a/f thru out the pull.
Last edited by djamps; 07-17-2012 at 07:00 AM.
#42
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Did i just read that you're swapping out the MREV2 because you lost 2 HP at peak and gained torque all through the curve?
Not complaining, just trying to be clear there? Chances are, with cams, you might make more power with the complete intake revision you're ordering, i assume you're after just peak numbers?
Not complaining, just trying to be clear there? Chances are, with cams, you might make more power with the complete intake revision you're ordering, i assume you're after just peak numbers?
#44
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Just being F/I on a stock block will induce phantom knock. I know because I have it . Ended up shutting down knock control completely on my track map and got an extra 4mph. It doesn't get talked about too much because uprev F/I has only recently started to take off in popularity and nobody really pushes the limits quite yet.
Last edited by djamps; 07-18-2012 at 05:17 AM.
#45
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Just being F/I on a stock block will induce phantom knock. I know because I have it . Ended up shutting down knock control completely on my track map and got an extra 4mph. It doesn't get talked about too much because uprev F/I has only recently started to take off in popularity and nobody really pushes the limits quite yet.
"fuuuuuuuuuuuuuuuuuu"
#46
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depending your goals I wouldn't jump straight into boost. If you are wanting an extra 100-150 hp then go for it but if you just want to be up at 300hp I would stay NA for sure.
Have you thought about going to a different fuel? E85 has proven great results for some imports that are NA. You can get the extra cooling from the fuel and then push the timing limits from the octane.
Increased compression would be nice like you said but requires a tear down of the engine which sucks. If you do up the compression then I would for sure use e85.
Have you thought about going to a different fuel? E85 has proven great results for some imports that are NA. You can get the extra cooling from the fuel and then push the timing limits from the octane.
Increased compression would be nice like you said but requires a tear down of the engine which sucks. If you do up the compression then I would for sure use e85.
#47
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I got da phantom knock! Ya, I'm not sure if it's the knock sensor or the oem knock map but our engines show tons of knock for no reason. My built engine is pretty noisy as well (on a knock sensor, not audible). I had to tweak the haltech knock map a bunch due to random strange noisy areas.
#49
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Ask the tuner to look up a RECENT base Z33 run and see what the numbers are. My guess is the dyno is just not set up the same. The key is get a recent output from the dyno under similar factors.
Otherwise, you may have an issue. Although cams don't add monster power on their own they normally give a pretty health bump once tuned.
Otherwise, you may have an issue. Although cams don't add monster power on their own they normally give a pretty health bump once tuned.
#51
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thats the funny thing about this game, some times 1+1 doesnt always equal 2...
looking at the cam profile, it could be that you dont have the right suppoting mods to run that cam. There is a lot more to choosing a cam other than just the duration and max lift. You have to take into account that because of the larger lift and longer duration and no intake/plenum tuning that the speed at which air enters your motor has actually decresed, there is a good possiblity that you are getting LESS air in, thus less air out, all combined for less HP in the end...
looking at the cam profile, it could be that you dont have the right suppoting mods to run that cam. There is a lot more to choosing a cam other than just the duration and max lift. You have to take into account that because of the larger lift and longer duration and no intake/plenum tuning that the speed at which air enters your motor has actually decresed, there is a good possiblity that you are getting LESS air in, thus less air out, all combined for less HP in the end...
Last edited by RDZMotorsports; 09-05-2012 at 06:00 AM.
#54
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On that note, it's impossible to have a generic knock map for any built engine. Every engine has unique sounds and needs to be setup properly in order to work. That goes with any car on the market. It's really not THAT hard to tune a knock map as long a the tuning solution used has that freedom.
#56
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oOo, yes it does. I'm not sure why they couldn't program a map to adjust the sensitivity like other platforms that use the OEM ecu. Seems like osiris is horribly limited compared to other oem ecu flash programs (for other cars of course).
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