Cel (2023 c8)
Race Director
Joined: Jan 2014
Posts: 10,709
Likes: 7,100
From: Fulshear, TX
Not normal, but it can happen if you unplug sensors with the battery still hooked up. My first step would be to check & clear the code, especially if it came on immediately. Press your blue OnStar button and they can read you the code, otherwise just run to Autozone or simlar and have them scan it. You can reset it with a scan tool or by unhooking the battery. If it comes back, then it is likely you either left something unhooked or the larger TB is not playing nice. The factory 87mm TB ported to 91mm eff. is my personal recommendation for the vast majority of C8 builds as you're not really gaining any additional airflow with the 95mm but are losing velocity and resolution.
Thread Starter
Cruising
Joined: Oct 2022
Posts: 11
Likes: 5
From: San Antonio
Not normal, but it can happen if you unplug sensors with the battery still hooked up. My first step would be to check & clear the code, especially if it came on immediately. Press your blue OnStar button and they can read you the code, otherwise just run to Autozone or simlar and have them scan it. You can reset it with a scan tool or by unhooking the battery. If it comes back, then it is likely you either left something unhooked or the larger TB is not playing nice. The factory 87mm TB ported to 91mm eff. is my personal recommendation for the vast majority of C8 builds as you're not really gaining any additional airflow with the 95mm but are losing velocity and resolution.
Thread Starter
Cruising
Joined: Oct 2022
Posts: 11
Likes: 5
From: San Antonio
Race Director
Joined: Jan 2014
Posts: 10,709
Likes: 7,100
From: Fulshear, TX
Did you use Loctite on them? I didn't on my C7 and they were continually coming loose and required periodic retorquing. I used it on my C8 bolts as recommended in the service manual.
Burning Brakes
Joined: Feb 2011
Posts: 833
Likes: 470
From: Goodyear AZ
Kracka, been debating going back to 91 as you mentioned. I put the Lingenfelter intake with 95mm tb on and it had some higher rpm gains however its been determined the stock manifold flows very well. I had to take everything off and go back to stock due to engine issues, dealer taking my engine out next week to put new cam phasers in, ugh. Once I get it back I need to determine if I just throw the soler 91mm tb back on or put the 95mm LF system back on. I could sell it but it also looks nice but didn't get a lot of extra performance for the cost, that's for sure
Race Director
Joined: Jan 2014
Posts: 10,709
Likes: 7,100
From: Fulshear, TX
How about splitting the difference and porting the stock LT2 intake manifold to pair with your Soler 91? You are right on the Lingenfelter looking amazing though! But heck, sell that and with the $$$ get your factory manifold ported and maybe add a set of headers?
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Burning Brakes
Joined: Feb 2011
Posts: 833
Likes: 470
From: Goodyear AZ
Been considering it partner, then I gotta buy another engine cover as I sold my old one. Not sure what I could get for that LF manifold and tb used. Curious what that 95 is doing vs 91 velocity wise as you mentioned.
Race Director
Joined: Jan 2014
Posts: 10,709
Likes: 7,100
From: Fulshear, TX
Air flow (cfm): 970
Air velocity (ft/min): 15159.07
Air velocity (ft/s): 252.65
91mm eff.:
Air flow (cfm): 970
Air velocity (ft/min): 13,855.69
Air velocity (ft/s): 230.93
95mm:
Air flow (cfm): 970
Air velocity (ft/min): 12713.47
Air velocity (ft/s): 211.89
100mm eff.:
Air flow (cfm): 970
Air velocity (ft/min): 11,473.91
Air velocity (ft/s): 191.23
I used 970 cfm since that is what the OEM LT2 87mm TB is rated at.
Last edited by Kracka; Oct 21, 2022 at 01:40 PM.
Burning Brakes
Joined: Feb 2011
Posts: 833
Likes: 470
From: Goodyear AZ
87mm:
Air flow (cfm): 970
Air velocity (ft/min): 15159.07
Air velocity (ft/s): 252.65
91mm eff.:
Air flow (cfm): 970
Air velocity (ft/min): 13,855.69
Air velocity (ft/s): 230.93
95mm:
Air flow (cfm): 970
Air velocity (ft/min): 12713.47
Air velocity (ft/s): 211.89
100mm eff.:
Air flow (cfm): 970
Air velocity (ft/min): 11,473.91
Air velocity (ft/s): 191.23
I used 970 cfm since that is what the OEM LT2 87mm TB is rated at.
Air flow (cfm): 970
Air velocity (ft/min): 15159.07
Air velocity (ft/s): 252.65
91mm eff.:
Air flow (cfm): 970
Air velocity (ft/min): 13,855.69
Air velocity (ft/s): 230.93
95mm:
Air flow (cfm): 970
Air velocity (ft/min): 12713.47
Air velocity (ft/s): 211.89
100mm eff.:
Air flow (cfm): 970
Air velocity (ft/min): 11,473.91
Air velocity (ft/s): 191.23
I used 970 cfm since that is what the OEM LT2 87mm TB is rated at.
Looks like I can get my stock manifold ported for about $400, curious if that and a 91 would be better than the LF and the 95. Likely so small its negligible either way, then got thinking about the 91 bolted to the LF manifold. Its a nice looking set up for sure....in hindsight I would not have gotten it tho knowing what a small difference over the 91 it made.
Burning Brakes
Joined: Feb 2011
Posts: 833
Likes: 470
From: Goodyear AZ
Its ported. Also Kracka, from Solers website here are the figures on the 91 and 95 tb's so although there is less velocity, there is more air moving thru so interesting concepts to consider. Also apologize to OP for totally hijacking his thread here bet appreciate him bringing us all together lol.
PERFORMANCE:
91 • Wide-open throttle flow: 1165 +/- 20 SCFM @ 20.4” of water vacuum [20% increase over OEM (970 SCFM)
95MM 1350 SCFM @ 20” H2O at WOT
PERFORMANCE:
91 • Wide-open throttle flow: 1165 +/- 20 SCFM @ 20.4” of water vacuum [20% increase over OEM (970 SCFM)
95MM 1350 SCFM @ 20” H2O at WOT
Le Mans Master
Joined: Oct 2005
Posts: 5,040
Likes: 879
From: Tampa Florida
Its ported. Also Kracka, from Solers website here are the figures on the 91 and 95 tb's so although there is less velocity, there is more air moving thru so interesting concepts to consider. Also apologize to OP for totally hijacking his thread here bet appreciate him bringing us all together lol.
PERFORMANCE:
91 • Wide-open throttle flow: 1165 +/- 20 SCFM @ 20.4” of water vacuum [20% increase over OEM (970 SCFM)
95MM 1350 SCFM @ 20” H2O at WOT
PERFORMANCE:
91 • Wide-open throttle flow: 1165 +/- 20 SCFM @ 20.4” of water vacuum [20% increase over OEM (970 SCFM)
95MM 1350 SCFM @ 20” H2O at WOT
Race Director
Joined: Jan 2014
Posts: 10,709
Likes: 7,100
From: Fulshear, TX
$300 actually! Here's who did mine; same price as LT1 porting. His pictures are actually my buddy's that I personally installed.
https://socalporting.com/our-service...ifold-porting/
Here are my LT2 pictures: https://www.corvetteforum.com/forums...post1604041634
https://socalporting.com/our-service...ifold-porting/
Here are my LT2 pictures: https://www.corvetteforum.com/forums...post1604041634
Last edited by Kracka; Oct 21, 2022 at 08:46 PM.
Race Director
Joined: Jan 2014
Posts: 10,709
Likes: 7,100
From: Fulshear, TX
Le Mans Master
Joined: Oct 2005
Posts: 5,040
Likes: 879
From: Tampa Florida
Going big is not always better. I agree with you on that point. I can remember Matt c8 when he went from the 91mm eff and switched to the 95mm ported
His c8 appeared to run slower .....never got a faster time than his 10.93 and wasn't even close to it. That really woke me up towards my final decision....87mm ported to the 91mm.
Burning Brakes
Joined: Feb 2011
Posts: 833
Likes: 470
From: Goodyear AZ
$300 actually! Here's who did mine; same price as LT1 porting. His pictures are actually my buddy's that I personally installed.
https://socalporting.com/our-service...ifold-porting/
Here are my LT2 pictures: https://www.corvetteforum.com/forums...post1604041634
https://socalporting.com/our-service...ifold-porting/
Here are my LT2 pictures: https://www.corvetteforum.com/forums...post1604041634
Race Director
Joined: Jan 2014
Posts: 10,709
Likes: 7,100
From: Fulshear, TX
thanks! So you're running a 91mm tb? Did you do tb and porting at same time? Just curious if you could feel a difference from just the porting as the lt2 manifold is supposed to flow pretty well. I definitely felt a difference going to the 91mm tb over stock. You guys are making me think lol, may go ported intake and back to 91mm tb and sell the LF system.
Last edited by Kracka; Oct 22, 2022 at 02:22 PM.
