I think I'm about to waste everybody's time because I don't know much about this VR-4. First let me pull on your heart strings . . .
My dad died earlier this year, and #368 (if memory serves me right) was his car. He split time between that and his NSX. He wasn't driving it lately because under boost the car would miss, and he had an NSX to drive.
Here's what I know: The car was supposed to be tuned to about 280 hp at 19 lbs of boost by someone years ago. It was a rocketship. I started driving it after he died, and the most boost I could pull out of it is 5 lbs at about 4k rpm, and then it would start to miss. The limit changes based on temp and rpm. I have a stochiometric meter fed by a narrow band O2 sensor which is half way into rich when this happens.
Not knowing any better, I replaced the plugs with NGK BPR6ES gapped at .028", and the problem still exists, although to a lesser extent. On the HWY at 4k it will pull about 8 lbs with no hesistation, although it happens when cold and at lower rpm. And lets face it, 8 isn't lot, although the boost controller is turned down. The plugs I pulled out were BPR7ES gapped at .030-.032", and they didnt look bad.
My money is on bad timing, although my brother who was looked into this more thinks it not enough fuel pressure. I don't think that is likely with the meter readings.
Any ideas and more importantly warnings are greatly appreciated. My inclination is that if a little is good, than a lot is better. Can I do harm by going back to a heat range 7 and gap them at .025"? What timing ranges are beyond reasonable?
Thanks for your help
My dad died earlier this year, and #368 (if memory serves me right) was his car. He split time between that and his NSX. He wasn't driving it lately because under boost the car would miss, and he had an NSX to drive.
Here's what I know: The car was supposed to be tuned to about 280 hp at 19 lbs of boost by someone years ago. It was a rocketship. I started driving it after he died, and the most boost I could pull out of it is 5 lbs at about 4k rpm, and then it would start to miss. The limit changes based on temp and rpm. I have a stochiometric meter fed by a narrow band O2 sensor which is half way into rich when this happens.
Not knowing any better, I replaced the plugs with NGK BPR6ES gapped at .028", and the problem still exists, although to a lesser extent. On the HWY at 4k it will pull about 8 lbs with no hesistation, although it happens when cold and at lower rpm. And lets face it, 8 isn't lot, although the boost controller is turned down. The plugs I pulled out were BPR7ES gapped at .030-.032", and they didnt look bad.
My money is on bad timing, although my brother who was looked into this more thinks it not enough fuel pressure. I don't think that is likely with the meter readings.
Any ideas and more importantly warnings are greatly appreciated. My inclination is that if a little is good, than a lot is better. Can I do harm by going back to a heat range 7 and gap them at .025"? What timing ranges are beyond reasonable?
Thanks for your help