MIVEC tuning
Jul 17, 2006, 09:32 AM
#47
Anden- PM sent
Currently the cam spec for the IX is reputed to be 268/260. I have no hard proof at this time other than word of mouth. The person in question has no reason to exaggerate, but it would explain why they respond so well to just a 272 exhaust cam, why even Turbotrix 272 intake cams idle like stock, and why GSC and Turbotrix have 280's.
Edit, included other cam makers that offer same results.
Currently the cam spec for the IX is reputed to be 268/260. I have no hard proof at this time other than word of mouth. The person in question has no reason to exaggerate, but it would explain why they respond so well to just a 272 exhaust cam, why even Turbotrix 272 intake cams idle like stock, and why GSC and Turbotrix have 280's.
Edit, included other cam makers that offer same results.
Last edited by JohnBradley; Jul 17, 2006 at 03:18 PM.
Jul 17, 2006, 09:59 AM
#48
Like I indicated elsewhere, do not use those advertised duration numbers in an attempt to compare cams from different makers!! They don't mean a doggone thing from one brand of cam to another, and that is why a Revolver "262" is a MUCH larger cam than a GSC 280. An HKS 272 is also a 'larger' cam (more lift and more effective duration) than a GSC 280, and probably explains why GSC 'went straight to a 280', as anything less from them was probably smaller than an HKS 264 and therefore too small to be worthwhile.
Last edited by Ted B; Jul 17, 2006 at 10:04 AM.
Jul 17, 2006, 02:26 PM
#49
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thanks john, private forum I see.
As soon as this heat wave passes I plan on doing some testing with a g-tech pro , evoscan and multiple mivec maps.
As soon as this heat wave passes I plan on doing some testing with a g-tech pro , evoscan and multiple mivec maps.
Last edited by andenbre; Jul 17, 2006 at 02:38 PM.
Jul 17, 2006, 03:26 PM
#50
Originally Posted by Ted B
Like I indicated elsewhere, do not use those advertised duration numbers in an attempt to compare cams from different makers!! They don't mean a doggone thing from one brand of cam to another, and that is why a Revolver "262" is a MUCH larger cam than a GSC 280. An HKS 272 is also a 'larger' cam (more lift and more effective duration) than a GSC 280, and probably explains why GSC 'went straight to a 280', as anything less from them was probably smaller than an HKS 264 and therefore too small to be worthwhile.
On topic- I have 2 other people using my current MIVEC map and both agree that it has made considerable improvement. I wont be able to get to the track till August 6th, so it will be a little while till I have concrete numbers. Has anyone else other than JCS and I been experimenting with upper rpm range tuning, that is willing to divulge?
EDIT-removed incorrect information
Last edited by JohnBradley; Jul 17, 2006 at 08:38 PM.
Jul 17, 2006, 04:22 PM
#51
Originally Posted by JohnBradley
Not that I want this to stray to far off topic, BUT Revolver measures cams @ .050, HKS and most other manufacturers measure at 1mm.
Jul 17, 2006, 08:43 PM
#53
Originally Posted by razorlab
Why then (since this is gonna WAY OFF TOPIC anyway) would he have posted advertised duration of 256/248 and @ .050 lift of 206* if the "272" that he sells is also 206*? Ramp rates are that much faster?
Jul 17, 2006, 08:50 PM
#54
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Originally Posted by JohnBradley
Not that I want this to stray to far off topic, BUT an old trick from the V8 world is to add 40 or 50 to (or vice versa subtract) to .050 numbers to see what "advertised" duration might be. Not always accurate (thus why its 40 or 50) but it gives you an idea of who is lying and who is telling the truth.
On topic- I have 2 other people using my current MIVEC map and both agree that it has made considerable improvement. I wont be able to get to the track till August 6th, so it will be a little while till I have concrete numbers. Has anyone else other than JCS and I been experimenting with upper rpm range tuning, that is willing to divulge?
EDIT-removed incorrect information
On topic- I have 2 other people using my current MIVEC map and both agree that it has made considerable improvement. I wont be able to get to the track till August 6th, so it will be a little while till I have concrete numbers. Has anyone else other than JCS and I been experimenting with upper rpm range tuning, that is willing to divulge?
EDIT-removed incorrect information
Something else I noticed. The car is more "rumbley" at deceleration. Kinda like an srt-4, but not as many noticeable pops. If that makes any sense?
Girlie
Jul 17, 2006, 09:01 PM
#55
Girlie-- I actually have noticed the same thing about increased and "different" sounding deceleration noise. Are you running the advanced settings that I had posted before or the newer ones reflecting the change in my tuning from the revelation that the map is in crank degrees not cam degrees?
I.e. post 24
I.e. post 24
Last edited by JohnBradley; Jul 17, 2006 at 09:08 PM.
Jul 17, 2006, 09:08 PM
#56
Re: EVO VIII cam specs, I have information from two sources: EVO Motorsports and Piper. The specs reported by each are very close, and more or less match the specs in the cam spec sticky. On the other hand, the specs reported by Brian Crower are markedly different, showing much less lift and duration. For the discrepancy of B. Crower's info, I have no explanation.
As for ramp rates, high performance aftermarket cams almost always have faster ramp rates than factory grinds. The Revolver set for example has very fast ramp rates.
As for ramp rates, high performance aftermarket cams almost always have faster ramp rates than factory grinds. The Revolver set for example has very fast ramp rates.
Jul 17, 2006, 09:13 PM
#57
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Originally Posted by JohnBradley
Girlie-- I actually have noticed the same thing about increased and "different" sounding deceleration noise. Are you running the advanced settings that I had posted before or the newer ones reflecting the change in my tuning from the revelation that the map is in crank degrees not cam degrees?
I.e. post 24
I.e. post 24
Here is my MIVEC map I am currently running....
Jul 17, 2006, 09:51 PM
#58
Originally Posted by Ted B
Re: EVO VIII cam specs, I have information from two sources: EVO Motorsports and Piper. The specs reported by each are very close, and more or less match the specs in the cam spec sticky. On the other hand, the specs reported by Brian Crower are markedly different, showing much less lift and duration. For the discrepancy of B. Crower's info, I have no explanation.
As for ramp rates, high performance aftermarket cams almost always have faster ramp rates than factory grinds. The Revolver set for example has very fast ramp rates.
As for ramp rates, high performance aftermarket cams almost always have faster ramp rates than factory grinds. The Revolver set for example has very fast ramp rates.
I was confused by your last comment in the "other" thread. The LOL was sarcasm? I thought the PM from Mark might be enough info or maybe not. As you have probably figured out this is a nom de plume.
Messr. Crower's data doesnt seem to match anyone elses. What do you make of his identical @ .050 duration, yet different advertised rates?
Girlie--> You might find that everything that is 6.0 or 4.8 in my part of the MIVEC map(6500 and 7000 high load cell) "feels" better at 7.8 for and adjusted -1* intake cam timing (8/2=4...-5 + 4= -1)
