I'm too busy to get hammered

 

Still waiting on street vids......

 

Did you think you were driving a Honda?

 

Had a day of "meh" on Tuesday, I made the trip down to F:T to try and get my high idle issue resolved. Dave swapped ViPECs with another car, tried 3 different throttle bodies and no change. The mystery as to why the car is idling so high remains.

I was also hoping to leave with a higher redline and more power, but after attempting to fix the idle, the car had a crazy rich spot in the tune around 6K rpm. Dave got the car on the dyno and basically had to almost re-tune and the power was all over the place, up & down, with the boost curve changing vs the previous graphs and having to pull out a bunch of fuel up top.

We take the car on the street then and the problems shows up again under WOT pulls, more fuel taken out, both on and off the meth. The car seems stronger than ever now, based on wheelspin at speed and butt dyno, but nothing ever seems to go smoothly for me the first time. Redline is still set at 6500rpm

 

What do you think was the cause of the tune changing and the boost not holding steady like it should?

What are you doing for temp compensation? Perhaps that just needed an adjustment or do you plan on returning every season?

 

Plenum air leak is the only thing I can think of given that ViPEC controls throttle, fuel and timing?

 

Sorry to hear this. Maybe the ViPEC has some quirks in the software that need to be sorted out before it's ready for prime time?

 

^^ but it's only his car. I'd trust the ViPEC more than I would the Cosworth...

 

I thought Silvan Lake was having similar issues with high idle and VDC light?

 

+1 temperature compensation curve is out of whack? The temps have come WAY down in the past few days.

 

I believe the ViPEC is able to correct for temp changes, but Dave checked that and it was only ~10*F cooler in the shop vs previous runs.

He found that the fuel pressure at the regulator was up 10lbs from 50 to 60 for some reason. Either swapping the ViPECs caused a change, or when he put the pass side kick panel back on either a wire was pulled out or possibly given proper contact since it was almost like the extra fuel pumps came online with all the extra fuel.

I am glad the car is running more like normal now, but wish its could have been a straightforward fix and more power for a change. I'm sure it will be sorted out, but we ran out of time yesterday and I'm not ready to give up the car for a week or so right now.

 

Damn, sorry to hear about your troubles. I hope you guys get them worked out in time to beat on her before the winter!

 

so its running more like normal, or you still have the idle unstable boost curve issues?

 

I did not know that. I saw the pretty pictures in his thread and I thought he was all set. Issues with both builds on the VQ that have been publicized on the forum doesn't sound good for the ViPEC. Chris, I would strongly consider giving Dave the car for a few days to work out the issues 100%. You don't want to run into throttle or fuel pump control problems because of some minor issue that might be a quick fix. Price to pay being on the bleeding edge...

 

The idle is stable, just high ~1500rpm, but its been that way since the start. I cannot speak to the boost curves since we (Dave) revamped the fuel map again while we were doing pulls on the street. What I meant by normal is that the car pulls very hard through redline and is super smooth again. When the issue came up, I could feel the car stumble a bit when it ran rich in the map.

I'm pretty sure that Gord's issues were mechanical with his cams. As far as I know, I am the only car having an issue with idle control. The other G in the shop (F:T) that is running ViPEC idles just fine. It may be an issue of overlap with the re-flash now that I consider it, but what do I know

Raj - Dave has been in contact this AM to check on the ride home and things seem fine. If the issue reoccurs I will take the car to him ASAP, I don't need anymore fail right now. As for the ViPEC, I'm not sure if any of the issues are related to it or not, but rest assured that I will post results regardless of what is found to be the cause.

Possible snow in the forecast for later this week, car might be done for the season regardless.... now where is that spare center console and those fiberglass door panels I got

 

Chris, RE the idle issue, have them double check the fuel injector latency settings in the EMS. There was a thread a while back where I posted the published latencies for the various fuel injectors.

 

Will do Terry, Thanks. Texting Dave now.

 

So what was the reason again for the redline being 100rpm's less than stock?

If the car was making power tio 6500rpm's why not go higher? I am not implying 8000+ but 7000rpm's is nothing for a built motor with headwork.

 

^^
+1

and we are not just talking about cams and basic springs, stock valves.

 

That was where we ran out of fuel pump initially, now we have to sort out this issue before getting more power.