new combo missing a bunch of power? - Page 2

pfordamx · 05-16-2017, 02:21 PM

i can check stall on the transbrake right? and i can tell you it will go to 4500 easily on the brake because thats where the 2 step is but it drops a ton of rpm inbetween gears. could line pressure or trans being over full cause this type of issue? the fact that it still leaves is what makes me think the sprag is ok. i was considering raising the 2 step to 6500 and seeing where the converter stopped it. could a bad msd box cause this type of problem? the only things that aren't new are the box and plug wires. so they're pretested but 6-7 years old when everything else is relatively new.

Dave Gantz · 05-17-2017, 11:13 AM

Quote:

Originally Posted by Bob Mulry

This sounds so obvious that I hesitate to post it......

Have you rechecked your cam timing?????

Along these lines, are you getting full throttle? Sorry if that's too obvious. Just hate to see you start pulling it all apart for nothing.

Mark Yacavone · 05-16-2017, 12:00 PM

Not the converter.
With NO stator ,it would run about 12.0h @ about 125 !

Put it in manual 3rd gear, and flash the converter.Not going to hurt anything at that power level.

randy wilson · 05-26-2017, 10:31 AM

Are you running the same carburetor?

pfordamx · 05-26-2017, 03:08 PM

The car has only been ran with one carburetor we do have another carb we could test. but this combo has only seen one carb so far and its new so its not a proven deal. we do have another carb we could test in its place but i'm thinking the carb could be way off and it should still be better than it is.

Hacksaw · 05-26-2017, 04:23 PM

I know two posts already stated this, but have you checked for WOT. Put someone in the car and work the throttle as you check it under the hood.

pfordamx · 05-26-2017, 05:00 PM

Yes wide open throttle has been confirmed.

Ed Carpenter · 05-27-2017, 01:12 PM

Timing? If we take out 10 degrees our car is .90 slower

pfordamx · 05-28-2017, 12:06 AM

worked on the car today and have seemingly struck a possible major part of the issue. first off we ran a compression test the variance was from 210-214 i think this roughly were it should be. verified tdc, phased in the distributor. and pulled out the msd digital 6 and blaster 2 in favor of 7al2 and HVC pro power coil and installed new spark plugs and plug wires. the spark plugs are the interesting part after talking with our carb builder on the phone today and sending him pictures of used plugs he calls back and says i didn't even look at the electrode and i can tell you your problem. those are a number 7 resistor plug you need a none resistor plug, that plug is way too cold and he gave me a part# for the proper plug. and the difference was immediately noticeable we don't have track #s to confirm its fixed but god it sounds crisper and is way less fat it actually seemed to burn the fuel it was the biggest difference i've ever seen in a motor the idle went up it was previously set at 1200 and it was trying to idling 2k this could be partially timing we set it as close as we could without the motor on but didn't verify with a light yet. but it was like a happier more rev happy engine all around hopefully get to go test and tune friday.

05-16-2017, 02:21 PM	#1
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	Re: new combo missing a bunch of power? i can check stall on the transbrake right? and i can tell you it will go to 4500 easily on the brake because thats where the 2 step is but it drops a ton of rpm inbetween gears. could line pressure or trans being over full cause this type of issue? the fact that it still leaves is what makes me think the sprag is ok. i was considering raising the 2 step to 6500 and seeing where the converter stopped it. could a bad msd box cause this type of problem? the only things that aren't new are the box and plug wires. so they're pretested but 6-7 years old when everything else is relatively new.

05-16-2017, 12:00 PM	#3
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,815 Likes: 2,903 Liked 5,121 Times in 1,952 Posts	Re: new combo missing a bunch of power? Not the converter. With NO stator ,it would run about 12.0h @ about 125 ! Put it in manual 3rd gear, and flash the converter.Not going to hurt anything at that power level. __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers Last edited by Mark Yacavone; 05-16-2017 at 12:04 PM.

05-26-2017, 10:31 AM	#4
randy wilson Senior Member Join Date: Jan 2007 Location: N/A Posts: 882 Likes: 0 Liked 22 Times in 22 Posts	Re: new combo missing a bunch of power? Are you running the same carburetor? __________________ don,t have one

05-26-2017, 03:08 PM	#5
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	Re: new combo missing a bunch of power? The car has only been ran with one carburetor we do have another carb we could test. but this combo has only seen one carb so far and its new so its not a proven deal. we do have another carb we could test in its place but i'm thinking the carb could be way off and it should still be better than it is.

05-26-2017, 04:23 PM	#6
Hacksaw Senior Member Join Date: Sep 2016 Posts: 882 Likes: 206 Liked 310 Times in 174 Posts	Re: new combo missing a bunch of power? I know two posts already stated this, but have you checked for WOT. Put someone in the car and work the throttle as you check it under the hood.

05-26-2017, 05:00 PM	#7
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	Re: new combo missing a bunch of power? Yes wide open throttle has been confirmed.

05-27-2017, 01:12 PM	#8
Ed Carpenter Live Reporter Join Date: May 2006 Location: Dripping Springs, Tx Posts: 2,709 Likes: 186 Liked 520 Times in 132 Posts	Re: new combo missing a bunch of power? Timing? If we take out 10 degrees our car is .90 slower __________________ Ed Carpenter 2005 Chevy Cobalt A/SM Race Engine Development

05-28-2017, 12:06 AM	#9
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 214 Likes: 3 Liked 7 Times in 5 Posts	Re: new combo missing a bunch of power? worked on the car today and have seemingly struck a possible major part of the issue. first off we ran a compression test the variance was from 210-214 i think this roughly were it should be. verified tdc, phased in the distributor. and pulled out the msd digital 6 and blaster 2 in favor of 7al2 and HVC pro power coil and installed new spark plugs and plug wires. the spark plugs are the interesting part after talking with our carb builder on the phone today and sending him pictures of used plugs he calls back and says i didn't even look at the electrode and i can tell you your problem. those are a number 7 resistor plug you need a none resistor plug, that plug is way too cold and he gave me a part# for the proper plug. and the difference was immediately noticeable we don't have track #s to confirm its fixed but god it sounds crisper and is way less fat it actually seemed to burn the fuel it was the biggest difference i've ever seen in a motor the idle went up it was previously set at 1200 and it was trying to idling 2k this could be partially timing we set it as close as we could without the motor on but didn't verify with a light yet. but it was like a happier more rev happy engine all around hopefully get to go test and tune friday.