HKS 264 cams - before and after dyno sheets and impression
Jun 21, 2003, 01:03 PM
#16
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Thanks for the info. Its people like you that make Evo.net great.
It has been suggested to me that much of the gains possible with custom cams can be achieved with some intake timing advance. 1-1.5 degrees. It would be an interesting experiment to do the same dyno run on the stock cams with intake advance.
It has been suggested to me that much of the gains possible with custom cams can be achieved with some intake timing advance. 1-1.5 degrees. It would be an interesting experiment to do the same dyno run on the stock cams with intake advance.
Jun 21, 2003, 01:13 PM
#17
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Originally posted by Braf
Thanks for the info. Its people like you that make Evo.net great.
It has been suggested to me that much of the gains possible with custom cams can be achieved with some intake timing advance. 1-1.5 degrees. It would be an interesting experiment to do the same dyno run on the stock cams with intake advance.
Thanks for the info. Its people like you that make Evo.net great.
It has been suggested to me that much of the gains possible with custom cams can be achieved with some intake timing advance. 1-1.5 degrees. It would be an interesting experiment to do the same dyno run on the stock cams with intake advance.
Cheers,
shiv
Last edited by shiv@vishnu; Jun 21, 2003 at 01:18 PM.
Jun 21, 2003, 02:27 PM
#18
Originally posted by shiv@vishnu
We got substantial gains (10-12hp on our dyno) by tweaking both intake and exhaust timing a few degrees (we retarded them, in fact). Big improvements to knock resistence and output with no discernable loss in the low end, idle stability, drivability, mpg, etc,. Only "problem" is that doing so can eventually trigger the a faulty misfire code (and check engine light) since the factory OBD-II misfire diagnostics constantly compare the crank and cam angle waveforms/angular velocities which will always be out of whack if exhaust cam timing is changed. We're in the process of revising some code and adding a few features to the XEDE in effort to eliminate this diagnostic glitch. If it works out, it will certainly be a nice no-downside option.
Cheers,
shiv
We got substantial gains (10-12hp on our dyno) by tweaking both intake and exhaust timing a few degrees (we retarded them, in fact). Big improvements to knock resistence and output with no discernable loss in the low end, idle stability, drivability, mpg, etc,. Only "problem" is that doing so can eventually trigger the a faulty misfire code (and check engine light) since the factory OBD-II misfire diagnostics constantly compare the crank and cam angle waveforms/angular velocities which will always be out of whack if exhaust cam timing is changed. We're in the process of revising some code and adding a few features to the XEDE in effort to eliminate this diagnostic glitch. If it works out, it will certainly be a nice no-downside option.
Cheers,
shiv
Shiv just out of curiosity - that code that comes up - is it a soft code - OR does the ecu pull back power when that code comes on ???
Thanks
Jun 21, 2003, 02:53 PM
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i've heard the AMS evo8 with 272 cams, and it idles amazing! i'm going 272/272 right away..
to each its own tho.. but since ive seen how they idle, im no longer undecided..
to each its own tho.. but since ive seen how they idle, im no longer undecided..
Jun 22, 2003, 03:40 PM
#20
Originally posted by spooldswede
i've heard the AMS evo8 with 272 cams, and it idles amazing! i'm going 272/272 right away..
to each its own tho.. but since ive seen how they idle, im no longer undecided..
i've heard the AMS evo8 with 272 cams, and it idles amazing! i'm going 272/272 right away..
to each its own tho.. but since ive seen how they idle, im no longer undecided..
Jun 22, 2003, 09:05 PM
#22
Originally posted by Event-Horizon
With these cams, is a piggy-back or a reflash needed or is it possible to drop them in and reset the ECU?
Is there a set path to stepping up to cams? Are there parts that are best to have before putting cams in? Thanks!
With these cams, is a piggy-back or a reflash needed or is it possible to drop them in and reset the ECU?
Is there a set path to stepping up to cams? Are there parts that are best to have before putting cams in? Thanks!
Jun 22, 2003, 11:36 PM
#23
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This is going to sound like a really dumb question, but bear with me...
Short of taking the head off, is there any way of finding out whether you have aftermarket cams? The reason I ask, is that I bought this car second hand, and not even the dealer knew what was in it.
He told me the turbo was stock, but when I looked, I knew that it was an upgraded turbo.
The idle is a little lumpy, so I wonder if it's just poorly tuned or if it's aggressive cams causing this. I am having it retuned this week, so at least I can eliminate that possibility.
But is there some way we can have a look at the timing of the cams without taking the head off?
Short of taking the head off, is there any way of finding out whether you have aftermarket cams? The reason I ask, is that I bought this car second hand, and not even the dealer knew what was in it.
He told me the turbo was stock, but when I looked, I knew that it was an upgraded turbo.
The idle is a little lumpy, so I wonder if it's just poorly tuned or if it's aggressive cams causing this. I am having it retuned this week, so at least I can eliminate that possibility.
But is there some way we can have a look at the timing of the cams without taking the head off?
Jun 23, 2003, 08:59 AM
#29
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you cannot raise the idle? but it seems there is no issue with the 272 cams idle... but the 264's do ALFRIEDESQ??? the 272's produce how much more power...and larger injectors will be needed, like what size? and do you need an in-tank feul pump?
oh, lastly, how much would all this kill the MPG?
-shahul
oh, lastly, how much would all this kill the MPG?
-shahul
