Help Please. Can’t find solution to this problem.
09-27-2018, 01:02 AM
#1
Help Please. Can’t find solution to this problem.
Hello, I’ve been having this itch about my dyno numbers and how the car runs. I have 1999 C5 Corvette, the mods are,
- Procharger pushing supposedly 10psi pulley 4.10 intercooled
- Fast 102 intake
-90mm throttle body
-160 thermostat
-Deatschwerks 78Ib injectors
-4L65e Upgraded trans to handle 700hp and 700tq
-Stall Converter 2500-2800
-3.42 Gears diff
- 340lph aeromotive fuel pump and with harness to alternator for more voltage.
-ls2 fuel rail
-tr6 spark plugs
- bbk shorties headers
- Straight pipe from headers back
-pcv delete
- 2 Trans coolers
- Bigger radiator
- no MAF, previously tuned on speed density tune
- 2 bar MAP sensor
- full E85 tune
And this was my dyno graph. Good but I believe for all the stuff I have it should be higher right? Or I’m I just crazy? Also my boost graph is all over the place?
- Procharger pushing supposedly 10psi pulley 4.10 intercooled
- Fast 102 intake
-90mm throttle body
-160 thermostat
-Deatschwerks 78Ib injectors
-4L65e Upgraded trans to handle 700hp and 700tq
-Stall Converter 2500-2800
-3.42 Gears diff
- 340lph aeromotive fuel pump and with harness to alternator for more voltage.
-ls2 fuel rail
-tr6 spark plugs
- bbk shorties headers
- Straight pipe from headers back
-pcv delete
- 2 Trans coolers
- Bigger radiator
- no MAF, previously tuned on speed density tune
- 2 bar MAP sensor
- full E85 tune
And this was my dyno graph. Good but I believe for all the stuff I have it should be higher right? Or I’m I just crazy? Also my boost graph is all over the place?
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CorvetteBrent (10-04-2018)
09-27-2018, 06:31 AM
#3
Don't take my word on this but let's see if I've learned something on the forum or if I fail the quiz lol.
4.10 pulley, Fast intake and TB. Pulley down and ditch the Fast stuff. Go with an LS6 intake and stock tb. Also, if this was just a dyno pull and not a dyno tune, maybe your timing is really really safe lol. Idk, just a few observations. Somebody else will chime in and correct me.
4.10 pulley, Fast intake and TB. Pulley down and ditch the Fast stuff. Go with an LS6 intake and stock tb. Also, if this was just a dyno pull and not a dyno tune, maybe your timing is really really safe lol. Idk, just a few observations. Somebody else will chime in and correct me.
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CorvetteBrent (10-04-2018)
09-27-2018, 07:59 AM
#4
Melting Slicks
1. Your peak boost is 7.81 so you're not hitting 10 psi anywhere and yes the boost looks a bit funky with all the fluctuations, boost on a centri should be pretty linear. Which Procharger head unit are you running?
2. Ditch those BBK shorty headers and get some real long tube headers.
3. What do you mean PCV Delete? How are you removing crank case pressure?
4. Who tuned the car? Was it tuned with all of these parts installed?
2. Ditch those BBK shorty headers and get some real long tube headers.
3. What do you mean PCV Delete? How are you removing crank case pressure?
4. Who tuned the car? Was it tuned with all of these parts installed?
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CorvetteBrent (10-04-2018)
09-27-2018, 09:06 PM
#6
1. Your peak boost is 7.81 so you're not hitting 10 psi anywhere and yes the boost looks a bit funky with all the fluctuations, boost on a centri should be pretty linear. Which Procharger head unit are you running?
2. Ditch those BBK shorty headers and get some real long tube headers.
3. What do you mean PCV Delete? How are you removing crank case pressure?
4. Who tuned the car? Was it tuned with all of these parts installed?
2. Ditch those BBK shorty headers and get some real long tube headers.
3. What do you mean PCV Delete? How are you removing crank case pressure?
4. Who tuned the car? Was it tuned with all of these parts installed?
2. Ok will do.
3. I changed the pcv system. I put breathers on the crankcase to let it breath.
4. I’ve been tuned by many respectable good tuners in my area and it was tuned with everything on.
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CorvetteBrent (10-04-2018)
09-28-2018, 01:26 AM
#8
09-28-2018, 07:19 AM
#9
Melting Slicks
1. It’s a p1sc head unit. I’ve been to like 4 timers and no one can figure the problem of boost fluctuations. The belt is good and tight.
2. Ok will do.
3. I changed the pcv system. I put breathers on the crankcase to let it breath.
4. I’ve been tuned by many respectable good tuners in my area and it was tuned with everything on.
3. Breathers are ok but you'd be much better off utilizing the PCV system to pull crank case pressure rather than just allowing it to vent. 3/8" lines are efficient up to 600whp so theres really no reason to remove the PCV, just put a catch can inline.
Perform the test from the charger inlet, that will pressurize the entire system. Spray soapy water at all couplers and watch for bubbling.
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CorvetteBrent (10-04-2018)
09-28-2018, 02:32 PM
#10
1. Perform a boost leak test. It could be something as simple as the BOV being forced open or a clamp that needs to be tightened down more.
3. Breathers are ok but you'd be much better off utilizing the PCV system to pull crank case pressure rather than just allowing it to vent. 3/8" lines are efficient up to 600whp so theres really no reason to remove the PCV, just put a catch can inline.
Perform the test from the charger inlet, that will pressurize the entire system. Spray soapy water at all couplers and watch for bubbling.
3. Breathers are ok but you'd be much better off utilizing the PCV system to pull crank case pressure rather than just allowing it to vent. 3/8" lines are efficient up to 600whp so theres really no reason to remove the PCV, just put a catch can inline.
Perform the test from the charger inlet, that will pressurize the entire system. Spray soapy water at all couplers and watch for bubbling.
09-28-2018, 05:13 PM
#11
Racer
Member Since: Nov 2015
Location: Central Monmouth NJ
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1. Perform a boost leak test. It could be something as simple as the BOV being forced open or a clamp that needs to be tightened down more.
3. Breathers are ok but you'd be much better off utilizing the PCV system to pull crank case pressure rather than just allowing it to vent. 3/8" lines are efficient up to 600whp so theres really no reason to remove the PCV, just put a catch can inline.
Perform the test from the charger inlet, that will pressurize the entire system. Spray soapy water at all couplers and watch for bubbling.
3. Breathers are ok but you'd be much better off utilizing the PCV system to pull crank case pressure rather than just allowing it to vent. 3/8" lines are efficient up to 600whp so theres really no reason to remove the PCV, just put a catch can inline.
Perform the test from the charger inlet, that will pressurize the entire system. Spray soapy water at all couplers and watch for bubbling.
Everything he said
10-01-2018, 02:56 PM
#12
Melting Slicks
Where and how are they recording boost ?
Is there a BOV fitted ? Is it installed and working correctly. That should have been a very easy test on a dyno.
Is there a BOV fitted ? Is it installed and working correctly. That should have been a very easy test on a dyno.
10-01-2018, 03:29 PM
#13
I have fixed some hose going to intercooler that were loose. It should fix the leak. Also I fixed belt slip with a better and smaller belt I bought. Also question I pulley from 4.10 to a 3.6 pulley how much of a difference should that make? My power goal is 500 min. And 550 would be amazing.
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CorvetteBrent (10-04-2018)
10-03-2018, 03:17 PM
#14
Supporting Vendor
You're going to make quite a few psi more boost with the pulley change. Even with the low boost on the previous pulls, you should've made significantly more power. I just finished tuning one at 7psi that made 590whp on pump gas and nowhere near an aggressive tune. Your dyno graph isn't properly showing the pull that you made. No way you had all those boost fluctuations and still ended up with a perfectly straight horsepower line. I consider it important for the lines to show the reality rather than getting smoothed and averaged out. With that new pulley, you should easily make 700+whp. If you don't, PM me and I'll go over some things with you. I don't believe your problems ended with discovering the boost leaks.
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Offering products from A&A Superchargers, East Coast Superchargers, Mechman Alternators, Mantic clutches, RPS clutches, Kooks Headers, Lakewood, LG, Brian Tooley Racing, Comp Cams, FAST, ARP, UPP Turbo systems, Wiseco, Callies, K1, MAST Motorsports, Haltech and many more. PM me for details.
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CorvetteBrent (10-04-2018)
10-03-2018, 04:50 PM
#15
Vette questions.
You're going to make quite a few psi more boost with the pulley change. Even with the low boost on the previous pulls, you should've made significantly more power. I just finished tuning one at 7psi that made 590whp on pump gas and nowhere near an aggressive tune. Your dyno graph isn't properly showing the pull that you made. No way you had all those boost fluctuations and still ended up with a perfectly straight horsepower line. I consider it important for the lines to show the reality rather than getting smoothed and averaged out. With that new pulley, you should easily make 700+whp. If you don't, PM me and I'll go over some things with you. I don't believe your problems ended with discovering the boost leaks.
10-04-2018, 09:21 AM
#16
Burning Brakes
My 2000 C5 Corvette is supercharged (Procharger P1 SC1), with a similar build to yours. On 7.2 lbs. of boost (not sure about my pulley size), mine recorded 517 WHP on the dyno. So I agree that you should be making significantly more horsepower. Wishing you the best in solving the problem, as I know how frustrating an issue like this can be.
10-06-2018, 03:58 PM
#17
Drifting
