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'89 Colt GT - Power & MPG http://4g61t.org/forum/viewtopic.php?f=64&t=37478 |
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Author: | CaptainTonus [ Wed Jul 24, 2013 2:27 pm ] |
Post subject: | Re: '89 Colt GT - Power & MPG |
Quote: Money has been tight so I decided to just make the 20G work and sell the 3071 (still available). I had to make a new wastegate actuator mount. The actuator head is 1/8" away from the fan and about 1/4" away from the manifold heat shield. I've been chasing a few fuel gremlins but I just got them worked out in the last few days. I have been tuning it with the AFC @ 20 psi and 91 pump gas. My target A/F's are right around 10:1 just because it has been so hot. I need to borrow Gimmie11's pocketlogger just to see where the timing and fuel trims are.
You can tune it a lot leaner than that. I'm currently running ~21psi on 91 octane with my setup (FP3065 turbo). 1,000cc injectors with a Walbro 450 pump and upgraded feed lines. I'm at about 80% injector duty cycle and my AFR's are around 11.7:1. I have no knock control, and no EGT gauge. I'm running around 16 degrees of timing. So far nothing has broken, and I rape the car every time I drive it. It trapped almost 97mph in the 1/8th with this tune. Of course, I'm not tuning on the stock ECU anymore, this is on a Megasquirt standalone. Maybe you don't want to try going as lean as I am, but you can definitely go leaner and not break anything. 11:1 should be totally fine at WOT.
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Author: | slow4dr [ Wed Jul 24, 2013 2:57 pm ] |
Post subject: | Re: '89 Colt GT - Power & MPG |
Quote: Quote: Money has been tight so I decided to just make the 20G work and sell the 3071 (still available). I had to make a new wastegate actuator mount. The actuator head is 1/8" away from the fan and about 1/4" away from the manifold heat shield. I've been chasing a few fuel gremlins but I just got them worked out in the last few days. I have been tuning it with the AFC @ 20 psi and 91 pump gas. My target A/F's are right around 10:1 just because it has been so hot. I need to borrow Gimmie11's pocketlogger just to see where the timing and fuel trims are.
You can tune it a lot leaner than that. I'm currently running ~21psi on 91 octane with my setup (FP3065 turbo). 1,000cc injectors with a Walbro 450 pump and upgraded feed lines. I'm at about 80% injector duty cycle and my AFR's are around 11.7:1. I have no knock control, and no EGT gauge. I'm running around 16 degrees of timing. So far nothing has broken, and I rape the car every time I drive it. It trapped almost 97mph in the 1/8th with this tune. Of course, I'm not tuning on the stock ECU anymore, this is on a Megasquirt standalone. Maybe you don't want to try going as lean as I am, but you can definitely go leaner and not break anything. 11:1 should be totally fine at WOT.Considering the car was scary lean just a week ago I am just playing it overly cautious until I get the logger connected. I am more than curious to see both timing and knock counts. I think I will eventually shoot for 11-11.5:1 on 91. Once that is dialed in I'll start playing with E85 again. |
Author: | slowdsm [ Wed Jul 24, 2013 3:23 pm ] |
Post subject: | Re: '89 Colt GT - Power & MPG |
that thing is badass..thanks for the link. Steve |
Author: | CaptainTonus [ Wed Jul 24, 2013 4:43 pm ] |
Post subject: | Re: '89 Colt GT - Power & MPG |
Quote: 97 in the 1/8th is cooking for sure. That damn thing will probably run 125+ out the back door. I don't really plan to drag my car but I'd like to know if it would trap 120+ on pump gas. Our Camaro runs 113-115 so it'll be interesting to see the comparison.
I wish I could run mine in the 1/4 to find out what it would do on the long end. I'm planning to make a trip up to Bakersfield once the weather cools off more. You should do it too. Getting 120+ traps in these cars is pretty darn easy compared to an AWD DSM.
Considering the car was scary lean just a week ago I am just playing it overly cautious until I get the logger connected. I am more than curious to see both timing and knock counts. I think I will eventually shoot for 11-11.5:1 on 91. Once that is dialed in I'll start playing with E85 again. |
Author: | gimmie11s [ Wed Jul 24, 2013 5:26 pm ] |
Post subject: | Re: '89 Colt GT - Power & MPG |
Quote:
You can tune it a lot leaner than that. I'm currently running ~21psi on 91 octane with my setup (FP3065 turbo). 1,000cc injectors with a Walbro 450 pump and upgraded feed lines. I'm at about 80% injector duty cycle and my AFR's are around 11.7:1. I have no knock control, and no EGT gauge. I'm running around 16 degrees of timing. So far nothing has broken, and I rape the car every time I drive it. It trapped almost 97mph in the 1/8th with this tune. Of course, I'm not tuning on the stock ECU anymore, this is on a Megasquirt standalone. Maybe you don't want to try going as lean as I am, but you can definitely go leaner and not break anything. 11:1 should be totally fine at WOT.
How much compression are you running? I cant get even close to 11:1 let alone 11:7 and this car knocks and pulls timing like crazy |
Author: | slow4dr [ Wed Jul 24, 2013 5:47 pm ] |
Post subject: | Re: '89 Colt GT - Power & MPG |
Quote: Quote: 97 in the 1/8th is cooking for sure. That damn thing will probably run 125+ out the back door. I don't really plan to drag my car but I'd like to know if it would trap 120+ on pump gas. Our Camaro runs 113-115 so it'll be interesting to see the comparison.
I wish I could run mine in the 1/4 to find out what it would do on the long end. I'm planning to make a trip up to Bakersfield once the weather cools off more. You should do it too. Getting 120+ traps in these cars is pretty darn easy compared to an AWD DSM.Considering the car was scary lean just a week ago I am just playing it overly cautious until I get the logger connected. I am more than curious to see both timing and knock counts. I think I will eventually shoot for 11-11.5:1 on 91. Once that is dialed in I'll start playing with E85 again. If you can be patient and wait for the NMCA race next year. The Real Street category would be a bunch of fun. 30 Mile street drive followed by 3 back to back track passes (at Pomona). Let's just hope they don't schedule if for June/July again. |
Author: | CaptainTonus [ Wed Jul 24, 2013 7:49 pm ] |
Post subject: | Re: '89 Colt GT - Power & MPG |
Quote: How much compression are you running?
8.5:1 CRI cant get even close to 11:1 let alone 11:7 and this car knocks and pulls timing like crazy Keep in mind, I'm on a standalone with no knock control. The factory ECU is probably going to want to knock like crazy if you try to tune it real aggressively. In my opinion, knock sensors are more of a pain than they are good. Quote: I will be at Famoso on September 13th, 14th & 15th but I will be working not playing. The track prep and conditions will be off the hook Friday night. If you go that weekend I can capture a shit ton of HD media of your car.
Nice! That's something to keep in mind. I don't know if the weather will be cool enough by then...
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Author: | xxNocturnalxx [ Thu Jul 25, 2013 1:39 am ] |
Post subject: | Re: '89 Colt GT - Power & MPG |
Crazy, I get rich knock if I'm anywhere in the 10s, the car likes to be 11.5-.7 on 92, timing 18ish up top. 7.8:1 |
Author: | slow4dr [ Thu Jul 25, 2013 10:45 am ] |
Post subject: | Re: '89 Colt GT - Power & MPG |
Quote:
Nice! That's something to keep in mind. I don't know if the weather will be cool enough by then...
We were just there two weeks ago and it was 100+ during the day but was low 80's during the night sessions. There were two records set that night in two different classes because the track was so good. Quote: Crazy, I get rich knock if I'm anywhere in the 10s, the car likes to be 11.5-.7 on 92, timing 18ish up top. 7.8:1
We haven't plugged in the logger yet so I could be rich knocking also.
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Author: | CaptainTonus [ Thu Jul 25, 2013 10:50 am ] |
Post subject: | Re: '89 Colt GT - Power & MPG |
Quote: We were just there two weeks ago and it was 100+ during the day but was low 80's during the night sessions. There were two records set that night in two different classes because the track was so good.
Low 80's is acceptable. I'll talk to the rest of my buddies about it and see if we can't plan to go up there that weekend.
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Author: | DSMERwCOLT [ Wed Aug 14, 2013 3:46 pm ] |
Post subject: | Re: '89 Colt GT - Power & MPG |
My colt and talon share the same ecu lol I am getting rid of the afc in the colt and using link. The talon doesn't get driven must so I am not sharing 2 linked ecu with 4 cars lol |
Author: | xxNocturnalxx [ Thu Aug 15, 2013 1:41 am ] |
Post subject: | Re: '89 Colt GT - Power & MPG |
I am curious as to how the rod bearing spun. I know it's a long story but I would like to learn from it. |
Author: | DSMERwCOLT [ Thu Aug 15, 2013 9:25 am ] |
Post subject: | Re: '89 Colt GT - Power & MPG |
I agree with Nocturnal. |
Author: | slow4dr [ Thu Aug 15, 2013 11:11 am ] |
Post subject: | Re: '89 Colt GT - Power & MPG |
When the problem actually occurred I was just driving along on the highway in 5th gear doing 70 mph. I can't imagine I overreved it. I haven't spun it over 7K. I was logging A/F on the Zietronix the morning it happened and spun it to 6925 (according to the log). I very rarely take it past 6500 because it just isn't making power up top. Just given the close proximity of taking it that high has me wondering. I had fuel delivery issues so maybe just maybe it had detonated to the point of damaging the bearing. I am going to try and get the engine out in the next day or two so I can start tearing it down. |
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