How much should boost vary with weather changes? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

eLeSthree · 04-19-2018, 10:15 AM

Working out a power loss issue on a buddys car. He made 10.5 psi @ 6500 when he was tuned a few months ago. Now we are seeing a MAX of 9psi at 7300rpms.

Hes running a P1SC and the tensioner is maxed. His belt is new.

Can a temperature difference of less than 20 degrees cause this drop in boost?

hillshooter · 04-19-2018, 10:26 AM

I will see a 2 PSI variant based on warm days VS cold days.

eLeSthree · 04-19-2018, 11:04 AM

Im guessing Utahs weather varies greater than Floridas. Im talking a difference between 85 and 65 degrees.

stevieturbo · 04-19-2018, 03:10 PM

Tensioner is maxed ? Are you saying it needs replaced or something ?

What does a graph of boost vs rpm look like ?

hillshooter · 04-19-2018, 03:13 PM

Quote:

Originally Posted by eLeSthree

Im guessing Utahs weather varies greater than Floridas. Im talking a difference between 85 and 65 degrees.

haha yeah good point. we can be 100 or 0. I don't drive under 40 degrees though.

AGP Turbo · 04-19-2018, 03:34 PM

Clean the airfiler out and don't re-oil it. Turbo and Centri's don't suck air well at all, they are designed to blow it super efficiently.

eLeSthree · 04-19-2018, 05:55 PM

Quote:

Originally Posted by stevieturbo

Tensioner is maxed ? Are you saying it needs replaced or something ?

What does a graph of boost vs rpm look like ?

Theres a bolt on the Procharger tensioner to adjust tension. His is maxed out.

eLeSthree · 04-19-2018, 05:56 PM

Quote:

Originally Posted by AGP Turbo

Clean the airfiler out and don't re-oil it. Turbo and Centri's don't suck air well at all, they are designed to blow it super efficiently.

Thank you Sir. I will do some pulls without the filter and report back.

eLeSthree · 04-20-2018, 07:06 AM

Quote:

Originally Posted by stevieturbo

Tensioner is maxed ? Are you saying it needs replaced or something ?

What does a graph of boost vs rpm look like ?

Does this look like belt slip?

ecreps · 04-20-2018, 07:34 AM

Quote:

Originally Posted by eLeSthree

Does this look like belt slip?

Not to me, not a ton anyway. Fuel pressure is dropping off a little though...

Is there a bunch of belt all over the supercharger pulley? I wouldn't think you'd have a ton of slip with a P1SC even on a 6-rib setup.

eLeSthree · 04-20-2018, 11:09 AM

Quote:

Originally Posted by ecreps

Not to me, not a ton anyway. Fuel pressure is dropping off a little though...

Is there a bunch of belt all over the supercharger pulley? I wouldn't think you'd have a ton of slip with a P1SC even on a 6-rib setup.

No sign of belt dust, 8 rib, and i showed him how we can fix his fuel pressure but, he didnt think it was necessary. I flashed my fpcm with the zl1 specs and i hold 58psi to redline. He is on E85, ID1300x2, zl1 pump and bap, making 650.

stevieturbo · 04-20-2018, 12:55 PM

Perhaps a slight step on one part of the graph, but as above, boost graph looks fairly good with no huge obvious drops or levelling off to indicate a lot of slip.

04-19-2018, 10:15 AM	#1
eLeSthree Drives: 2011 Camaro SS 6sp Join Date: Nov 2016 Location: Drivers Seat Posts: 1,904	How much should boost vary with weather changes? Working out a power loss issue on a buddys car. He made 10.5 psi @ 6500 when he was tuned a few months ago. Now we are seeing a MAX of 9psi at 7300rpms. Hes running a P1SC and the tensioner is maxed. His belt is new. Can a temperature difference of less than 20 degrees cause this drop in boost? __________________ 2011 Camaro SS---SOLD TMS Dart 427 FED M311s, ESS Tuning G4 Blower, DSX Triple FP Assembly, DSX FF, FIC1300, Mcleod RXT 1200HD, Edlebrock Pro Flo XT 1158whp 1017wtq. 2010 CTS-V A6 - "Stock" SOLD 630whp 658wtq 2024 F-150 RCSB 5.0 4x4 waiting for tunes...

04-19-2018, 10:26 AM	#2
hillshooter Drives: 2015 Camaro SS commemorative Join Date: May 2015 Location: Utah Posts: 425	I will see a 2 PSI variant based on warm days VS cold days. __________________ 2015 Camaro SS, LS3 Stroker, PRC heads,CUSTOM CAM. AGP 68/68 with custom Hot and Cold side. Fore triple pumps, Holley terminator X. BMR drag suspension with carlyle brake kit. 15" ET drags and 17" skinnies. ZL1 3.73 gears , aluminum driveshaft. TH400 with circle D converter.

04-19-2018, 11:04 AM	#3
eLeSthree Drives: 2011 Camaro SS 6sp Join Date: Nov 2016 Location: Drivers Seat Posts: 1,904	Im guessing Utahs weather varies greater than Floridas. Im talking a difference between 85 and 65 degrees. __________________ 2011 Camaro SS---SOLD TMS Dart 427 FED M311s, ESS Tuning G4 Blower, DSX Triple FP Assembly, DSX FF, FIC1300, Mcleod RXT 1200HD, Edlebrock Pro Flo XT 1158whp 1017wtq. 2010 CTS-V A6 - "Stock" SOLD 630whp 658wtq 2024 F-150 RCSB 5.0 4x4 waiting for tunes...

04-19-2018, 03:10 PM	#4
stevieturbo Drives: it changes Join Date: Nov 2010 Location: Norn Iron Posts: 1,126	Tensioner is maxed ? Are you saying it needs replaced or something ? What does a graph of boost vs rpm look like ?

04-19-2018, 03:34 PM	#6
AGP Turbo Drives: All things Turbocharged Join Date: Dec 2010 Location: AZ Posts: 1,199	Clean the airfiler out and don't re-oil it. Turbo and Centri's don't suck air well at all, they are designed to blow it super efficiently.

04-20-2018, 12:55 PM	#12
stevieturbo Drives: it changes Join Date: Nov 2010 Location: Norn Iron Posts: 1,126	Perhaps a slight step on one part of the graph, but as above, boost graph looks fairly good with no huge obvious drops or levelling off to indicate a lot of slip.