ATI power problem confirmed graph inside
Thread Starter
Instructor
Joined: Jan 2002
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From: Phoenix AZ
ATI power problem confirmed graph inside
Ok it's not the belt slipping (it's got boost). It's definitely pulling timing. We did an Autotap run in 4th gear just like on the dyno. You can see where the timing takes a dump right at 4,300 which is where the dyno graph also takes a dump. So it looks like we'll just have to have it tuned.
Thread Starter
Instructor
Joined: Jan 2002
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From: Phoenix AZ
Re: ATI power problem confirmed graph inside (SomeDay)
BTW we didn't record knock retard, but the most I have seen on this car is around 4 and it's usually 0 so I don't think that's the problem.
Burning Brakes
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From: Beebe AR
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Re: ATI power problem confirmed graph inside (SomeDay)
I see you are still fighting the problem. Be sure and post when the problem is resolved.
I have not received my ATI yet but have already ordered LS1 edit and autotap in anticipation of having to make adjustments.
I have not received my ATI yet but have already ordered LS1 edit and autotap in anticipation of having to make adjustments.
Thread Starter
Instructor
Joined: Jan 2002
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From: Phoenix AZ
Re: ATI power problem confirmed graph inside (QuickSilver2002)
Yeah probably a good idea. We were having some sort of connection problem and couldn't get ATap to show all the parameters, works now though.
Racer
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From: royal oak mi
Re: ATI power problem confirmed graph inside (SomeDay)
Is that with the programmin supplied with the kit? It looks extremely conservative. Your timing should drop at the point where you make pk TQ (which I am assuming is 4300 RPM) but not by that much. From there is should ramp back up to redline. :confused:
Team Owner
Joined: Mar 1999
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From: San Jose/Bear Valley CA
CA Events Coordinator
Re: ATI power problem confirmed graph inside (SomeDay)
I hope you get it all figured out... I found out my car is running 10% rich with the Superchips programing...
vetterdstr :cheers:
vetterdstr :cheers:
Thread Starter
Instructor
Joined: Jan 2002
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From: Phoenix AZ
Re: ATI power problem confirmed graph inside (sacsrpc)
That's the supplied programming. We're gonna have to do another run like that and check for knock.
Is that with the programmin supplied with the kit? It looks extremely conservative. Your timing should drop at the point where you make pk TQ (which I am assuming is 4300 RPM) but not by that much. From there is should ramp back up to redline.
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Racer
Joined: Jun 2002
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From: royal oak mi
Re: ATI power problem confirmed graph inside (SomeDay)
yeah defnitely log another run and see if this is just the way the timing is set or whether you are getting any knock retard to ause such a low number. Might be time to invest into LS1 edit or find a shop locally that has it. You should be able to run 16 degrees of timing at your peak tq point and ramp it back up to 28 at redline ( this is the curve I used for my powerdyned 99SS). This is assuming 93 octane is available in your area, otherwise try a degree less at pq torque and go from there. Just looked at the graph again.....32 degress at the top end seems kind of high, that will probably need to come down a bit to get a pump gas friendly tune.
[Modified by sacsrpc, 2:47 AM 6/25/2002]
[Modified by sacsrpc, 2:47 AM 6/25/2002]
Thread Starter
Instructor
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From: Phoenix AZ
Re: ATI power problem confirmed graph inside (SomeDay)
It turns out it is getting some knock, not real bad only 4-5 degrees but it needs to be fixed. First step is to run some high octane fuel to determine if it's real or false knock.
Burning Brakes
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From: Beebe AR
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Re: ATI power problem confirmed graph inside (SomeDay)
I know you have been struggling with the problem. It looks like some of it may be the Arizona heat and possibly the lower octane gas that seems to be sold out west. Keep working at it, you will conquer.
Racer
Joined: Jun 2002
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From: royal oak mi
Re: ATI power problem confirmed graph inside (SomeDay)
yep definitely need to see what the knock retard is from. ANd from looking at the graphs it still looks like a conservative tune. You might also be getting real knock from not enough fuel. DId you log O2 readings? They aren't good to tune by though (12.5 of timing at pk tq),,,,might be worth it to get it on a wideband o2 dyno to avoid burning a piston.
Thread Starter
Instructor
Joined: Jan 2002
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From: Phoenix AZ
Re: ATI power problem confirmed graph inside (SomeDay)
The a/f ratio is good http://forums.corvetteforum.com/zerothread?id=324823
We might try going to a 160 thermostat and reprogramming the fans, that's gotta help. Right now it's still running hotter than it should, we're going to take one of the original fans and install it as a pusher fan.
We might try going to a 160 thermostat and reprogramming the fans, that's gotta help. Right now it's still running hotter than it should, we're going to take one of the original fans and install it as a pusher fan.
Burning Brakes
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From: Beebe AR
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Re: ATI power problem confirmed graph inside (SomeDay)
We might try going to a 160 thermostat and reprogramming the fans, that's gotta help. Right now it's still running hotter than it should, we're going to take one of the original fans and install it as a pusher fan.
In that hot weather, even a 160 thermostat with fans reprogrammed, you will most likely run quite a bit warmer than 160. I run around 190-200 in traffic during the summer myself with the fans kicking on at 172.
[Modified by Mad_Dog, 2:35 PM 6/26/2002]
Melting Slicks
Joined: Mar 2002
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From: Tx
Re: ATI power problem confirmed graph inside (SomeDay)
That sounds pretty hot! It seems like that would be a major contributing factor to the pre ignition. It would be interesting to see the knock with the coolant below 190*.
Burning Brakes
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From: Beebe AR
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Re: ATI power problem confirmed graph inside (QuickSilver2002)
That sounds pretty hot! It seems like that would be a major contributing factor to the pre ignition. It would be interesting to see the knock with the coolant below 190*.
I would definitely do as you said above change the thermostat and lower the temperature the fans kick in. Best of luck on getting it to perform.