I took 2nd place at the SD Tour, but the car is still there pending the 2nd national event next weekend (Mar 29/30). That's the one with the drag start, which is way more fun. After that event, I'll return and might dyno, but no plans at the moment. It is running more boost with a better tune now that the spark issue is resolved, so it would probably be a good idea to see where it stands now. RP didn't have much to work with and still pulled out the same power that I had before the install and E-85 switch, so there might be another 15-20whp in there. Only trapping 115.xx at sea level doesn't give me much hope, though, since I was hoping to trap 113 up here.
Good stuff, but I'd want to fix that dip in the mid-range, and I'm stumped by how your power peaks so late at this altitude. I don't really understand that, because even 24psi at sea level would have peak WHP at a much earlier RPM and that's with far great efficiency, so it doesn't make sense. Any ideas, Brian?
It's as if something is still off with that dyno, because the boost is still way late (known problem), but it's as if it pushes the power curves to the right, too. Same power and such but at the wrong RPMs - not 100% sure, though, because the curves still intersect at 5252rpm.
Thanks Clayton. That little dip was giving Lucas fits. It was worse originally. We did several more pulls to clean it up to where it is now. It was getting late in the day, and I had to get going. We suspected the problem might have resided in the MIVEC mapping, but we were running out of time. I will probably have Lucas try to clean it up at some point. Overall, I am still very pleased.
Thanks Clayton. That little dip was giving Lucas fits. It was worse originally. We did several more pulls to clean it up to where it is now. It was getting late in the day, and I had to get going. We suspected the problem might have resided in the MIVEC mapping, but we were running out of time. I will probably have Lucas try to clean it up at some point. Overall, I am still very pleased.
You've got the JDM MIVEC map in your car, there should be no issues with it that would relate to the dip in power you're experiencing. Assuming the MIVEC map has not been changed. What boost controller are you using?
You've got the JDM MIVEC map in your car, there should be no issues with it that would relate to the dip in power you're experiencing. Assuming the MIVEC map has not been changed. What boost controller are you using?
Lucas modified the JDM map slightly to try to smooth out the dip. However, our first pulls, which had a bigger dip, left the map unmodified.
I am using a Forge UNOS MBC. I think we are just using the spring that comes in the controller. We didn't switch to the other one provided. I wouldn't think that would be the issue since it allowed us to peak at 24psi, and I believe 26psi is about the limit of that spring.
Cool.. I'm certain there's another issue present here, as there is no way the MIVEC map is the cause of this. That map and variations of it are used by just about all "tuned" EVO IX's. It's the basis of which all typically start from.
1000cc is normal for a GT35R on gas, and you can overrun them with race gas and big boost. Add 30% fuel to that, and you need more than 1200s if you're going to run big boost (that would be the point of E-85).
Cool.. I'm certain there's another issue present here, as there is no way the MIVEC map is the cause of this. That map and variations of it are used by just about all "tuned" EVO IX's. It's the basis of which all typically start from.
It was a very interesting Mivec map and I tried to use some of my Mivec maps that I created and it smoothed out that dip quite a bit but not all the way. Timing is great with no gaps and is smooth as can be so thats why I thought it was in the Mivec Map. I need to look at the scan logs to see if something is up with calculated load. Tobz is on to something, could be the wastegate.
As Matthew said he was happy with it and when we get some head-studs on we will be able to have more time to work it out and make more power.
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