converting my 9 to an 8 (remove mivec)
The IX head is the most resistant to flexing and has the best metallurgy of all 4G63 heads. It uses small head plugs for a reason 
The VIII is a 4 plug ECU harness and the IX is a 3 plug. There are some substantial changes that need to be addressed. The last 8 we converted to a 9 cost about 2500 in parts and that was a mix of used and new parts. An 8 would be a little less since some of that is MIVEC specific but still its not gonna be cheap.
The VIII is a 4 plug ECU harness and the IX is a 3 plug. There are some substantial changes that need to be addressed. The last 8 we converted to a 9 cost about 2500 in parts and that was a mix of used and new parts. An 8 would be a little less since some of that is MIVEC specific but still its not gonna be cheap.
If you still want to convert from 8 to 9 pm me. I want
Mivec and maybe we could work something out.
Evolving Member
Joined: Jan 2009
Posts: 162
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From: Boynton Beach, Fl
This whole cam snapping ordeal is just like the old 7 bolts and their "crank walk", blown way out of proportion from posts like these.
Just because you want cams with a larger lift doesn't necessarily mean the car will make more power or the cams are superior to those with less. Duration and valve over lap more important to a cams profile than the lift, not to mention the degree on the crankshafts revolution the cam begins to open the valve and for how long (duration). MIVEC only enhances the benefits of a larger cam profile. What you want to do reminds me of all the small block efi guys switching to carb because they're too lazy to tune. On bolt on applications sure they picked up a few 10ths in the 1320, but when they want to start making real power they never seem to catch the efi guys. Yes there are some exceptions, just like Buschur and AMS, BUT LOOK WHO YOU'RE TALKING ABOUT! They're in the top 5 list of leaders in the Evo community and are backed by the leading manufacturers of speed parts. They have every resource on tap and unlimited dyno time to make the old technology of the XIII's perform the way they do. You'll be doing more work to get less, maybe the same power you can make with the right IX cams. ****, look at 9sex9 and most-wanted's sucess and they are on baby turbos. Both 9's, both making way more power than you and both out perform stroked 8's with bigger turbos. The facts are all where anyone can find them. It would be a waste of time and money to ditch the mivec just because you're afraid of a snapped cam. Like I said, that scenario has been blown way out of proportion just like "crank walk".
Just because you want cams with a larger lift doesn't necessarily mean the car will make more power or the cams are superior to those with less. Duration and valve over lap more important to a cams profile than the lift, not to mention the degree on the crankshafts revolution the cam begins to open the valve and for how long (duration). MIVEC only enhances the benefits of a larger cam profile. What you want to do reminds me of all the small block efi guys switching to carb because they're too lazy to tune. On bolt on applications sure they picked up a few 10ths in the 1320, but when they want to start making real power they never seem to catch the efi guys. Yes there are some exceptions, just like Buschur and AMS, BUT LOOK WHO YOU'RE TALKING ABOUT! They're in the top 5 list of leaders in the Evo community and are backed by the leading manufacturers of speed parts. They have every resource on tap and unlimited dyno time to make the old technology of the XIII's perform the way they do. You'll be doing more work to get less, maybe the same power you can make with the right IX cams. ****, look at 9sex9 and most-wanted's sucess and they are on baby turbos. Both 9's, both making way more power than you and both out perform stroked 8's with bigger turbos. The facts are all where anyone can find them. It would be a waste of time and money to ditch the mivec just because you're afraid of a snapped cam. Like I said, that scenario has been blown way out of proportion just like "crank walk".
Wow your the dumbass, I think I speak for all of us who have had a cam break when I say we don't want to have to do another several thousand $ rebuild, we'd rather spend a little and ditch mivec and not have to worry again.. I bought a "good" set and had them prof installed by a top installer and they broke, I'm in college and can't keep affording thousands in motor builds.
Now on topic I think some hard facts are in need for this. Me and my engine builder have been taliking about this a lot and the exact details would be great... I highly doubt it's more cost efficient to sell and buy an 8 than to just do the swap but idk yet.
Now on topic I think some hard facts are in need for this. Me and my engine builder have been taliking about this a lot and the exact details would be great... I highly doubt it's more cost efficient to sell and buy an 8 than to just do the swap but idk yet.
Ive had both GSC's and Cosworth's and have had zero issues. I'd say I've pushed them pretty hard too
And to say there aren't any aggressive IX cams is false. Look at the FP5R's. I'd say they are pretty aggressive If you want to do the swap, then John Bradley gave you good info as well as some others...
And to say there aren't any aggressive IX cams is false. Look at the FP5R's. I'd say they are pretty aggressive If you want to do the swap, then John Bradley gave you good info as well as some others...
do you want to swap heads with me? Mine is ported with 1mm oversized valves and titanium springs and retainers. I wanted to do a 9 conversion on my 8. right now I have comp 280 cams. GSC sent me s2's to replace the cracked 272's but I just went with the comps as my tuner recommended.
Last edited by johnjonfenomeno; Mar 18, 2009 at 07:14 AM.
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