DIY Top End Porting
12-17-2017, 03:39 PM
#84
Melting Slicks
Thread Starter
Got it back together, turned the key and it still would not start. Got spark now and 45psi of fuel pressure. I pulled the chip and re-installed. It did not feel like it was seated all the way. Turned the key and she fired right up!!! Ran a little rough but soon smoothed out. I blocked the TB coolant lines so I need to run a few heat cycles to make sure she is full. I am getting coolant back though the small return line which is a good indication my pump is not air locked. I need to leave town for a couple of days but will take it out for a test drive later in the week.
Last edited by KJL; 12-17-2017 at 03:44 PM.
12-22-2017, 07:42 AM
#87
Le Mans Master
Member Since: Oct 2004
Location: South-central Missouri
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Paul-
My guess is there would be a small improvement in flow through the horn at high velocities. I just removed some casting impections and some of the sharp edges where the air transitions into the throttle body. My guess is the horn, given its size relative to everything else is not a pinch point for air flow. My little flow bench setup could not flow enough air to register any meaningful values for that.
My guess is there would be a small improvement in flow through the horn at high velocities. I just removed some casting impections and some of the sharp edges where the air transitions into the throttle body. My guess is the horn, given its size relative to everything else is not a pinch point for air flow. My little flow bench setup could not flow enough air to register any meaningful values for that.
I
12-22-2017, 08:45 AM
#88
Melting Slicks
Thread Starter
Took her out for a spin, ran great! Lots of seamless power. I will get it on a dyno soon to see see how much improvement. Almost got stopped by the cops. He was coming from the other direction as I was accelerating (not going fast) and I saw he put on his brakes so I quickly tapped mine to acknowledge I saw him. No issues. Many cops in the area are car nuts themselves. I have never been pulled over but received lots of smiles and thumbs up over the years. Now my pick up truck is a whole other story.....
Last edited by KJL; 05-14-2018 at 03:56 PM.
03-13-2018, 11:31 AM
#89
Melting Slicks
Thread Starter
Putting it on the dyno tomorrow. Should be interesting to see if she does any better than the original run. Only upgrade is the port work, TB cooling delete, Secondary throttle blades locked open, new injectors and Marcs chip.
03-13-2018, 12:03 PM
#91
Melting Slicks
Thread Starter
I have that OBDI android app with the blue tube adapter. I plan on data logging the session as well.
Last edited by KJL; 03-13-2018 at 12:48 PM.
03-14-2018, 04:41 PM
#92
Melting Slicks
Thread Starter
The numbers are in:
Upgrades:
Port Work as shown above
New Injectors
New Chip from Marc
Locked open secondary system
371 rwhp @ 5770 rpm +36 HP gain
362 rwtq @ 4860 rpm +30 ft-lb gain
Better than I expected. Headers and better exhaust would likely put me in the 390+ area which would be on par with my 95.
Upgrades:
Port Work as shown above
New Injectors
New Chip from Marc
Locked open secondary system
371 rwhp @ 5770 rpm +36 HP gain
362 rwtq @ 4860 rpm +30 ft-lb gain
Better than I expected. Headers and better exhaust would likely put me in the 390+ area which would be on par with my 95.
Last edited by KJL; 03-14-2018 at 08:18 PM.
03-14-2018, 07:19 PM
#93
Le Mans Master
My comment deals with where your power and torque peaks are. I believe they are on the low side of the rpm scale.
The image I have attached shows a comparison of progressive stages of modification w the bottom one being just ported top end and exhaust which is as close a compare I have to your setup.
Not trying to rain on your parade but it might suggest getting cams re-timed.
The image I have attached shows a comparison of progressive stages of modification w the bottom one being just ported top end and exhaust which is as close a compare I have to your setup.
Not trying to rain on your parade but it might suggest getting cams re-timed.
03-14-2018, 08:25 PM
#94
Melting Slicks
Thread Starter
The original run also seemed to peak a little early. It does appear that the peaks did move up the rpm scale a bit from the porting. I also performed a ALDLDroid data log of both runs. The second run we ran up to 6500 but the curve flattens out at 6000. I will get that curve tomorrow and post it as well.
Last edited by KJL; 03-14-2018 at 08:27 PM.
03-15-2018, 10:57 AM
#95
Le Mans Master
Member Since: Oct 2004
Location: South-central Missouri
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The original run also seemed to peak a little early. It does appear that the peaks did move up the rpm scale a bit from the porting. I also performed a ALDLDroid data log of both runs. The second run we ran up to 6500 but the curve flattens out at 6000. I will get that curve tomorrow and post it as well.
Below is my LT5 - pretty much the same setup as Dom's, except the cams are stock. But, look at how the power/torque curve patterns compare (supporting Dom's comments).
.
03-15-2018, 12:06 PM
#96
Melting Slicks
Thread Starter
Thanks for the feedback. It is a stock engine with 21,000 miles on it. If it has a phasing issue, it likely came from the factory that way. I am going to review the other curve and may re-run it to a higher rpm. If Dom is willing to review my data log that would be great. Either way if it is a phasing issue then I will likely have to live it until the next time I get bored and decide to pull the engine. Not many people around here know much about these cars
Last edited by KJL; 03-15-2018 at 05:46 PM.
03-16-2018, 10:59 AM
#98
Drifting
Dom did some great tuning work on my car. As for mechanical work I understand one of the better Z shops is back in business.
South Georgia Corvettes, 1396 Dillon Rd, Thomasville, GA 31757
229-403-7009
H
South Georgia Corvettes, 1396 Dillon Rd, Thomasville, GA 31757
229-403-7009
H
03-18-2018, 06:31 PM
#99
Melting Slicks
Thread Starter
Thanks for the info. I am probably going to leave the car alone for now. It runs so well. Like a new car. My 95 is my play car. I am seriously considering one of Pete's engine conversions. I am planning on running that car next with data logs and O2 data so Hopefully Dom can tune a few extra ponies into her before I pull the trigger on an engine upgrade.
03-19-2018, 03:01 PM
#100
Burning Brakes
