Throttle body
Thread Starter
Intermediate
Joined: Jan 2010
Posts: 29
Likes: 0
Throttle body
Which size throttle body size should I be researching for getting the best out of a ported intake? While still planing on daily driving. This is my first Vette since the C5. I just don’t even know where to start looking.
Last edited by miscexpense; Aug 1, 2021 at 07:01 PM.
Burning Brakes
Joined: Aug 2007
Posts: 817
Likes: 461
I have seen the throttle body ported to 91mm, and I have seen people replacing the throttle body with 95mm and 100mm throttle bodies. There seems to be some disagreement on whether anything over 93mm will throw a check engine light. Maybe check with Wilson manifolds. They port the LT2 manifold for bigger throttle bodies, so maybe they can provide insight on what works best.
Racer
Joined: Feb 2020
Posts: 387
Likes: 577
From: Philly
Your 2 options are the factory 87 (ported to 91) or a LT5 95mm (ported to 100).
Porting the IM to accommodate a 95 is tricky, some places will bevel port the snout to match a 95 but towards the inside of the snout it tapers back in the back to 90ish because it's too thin. You could break out the epoxy if you breach the wall trying to maximize it. No gasket so you may need to RTV the combo also
I have ported my 87 and my IM...the dyno showed a kpa very close to 100 thru the pull, meaning it was not drawing vacuum. My gains were 10-15 on multiple runs (with headers) so their is some gains to be had.
Side note; my buddy has the CarbonR/ported95 on his car, from the screenshots I saw his gains were 15 too. I will confirm that though when I see him this week and report back.
Porting the IM to accommodate a 95 is tricky, some places will bevel port the snout to match a 95 but towards the inside of the snout it tapers back in the back to 90ish because it's too thin. You could break out the epoxy if you breach the wall trying to maximize it. No gasket so you may need to RTV the combo also
I have ported my 87 and my IM...the dyno showed a kpa very close to 100 thru the pull, meaning it was not drawing vacuum. My gains were 10-15 on multiple runs (with headers) so their is some gains to be had.
Side note; my buddy has the CarbonR/ported95 on his car, from the screenshots I saw his gains were 15 too. I will confirm that though when I see him this week and report back.
Supporting Vendor
Joined: Dec 2018
Posts: 1,720
Likes: 814
From: South Alabama
OP, it depends on your final goal. If adding more than 100 hp go for our 95+mm, but make sure you port your manifold to 95mm as well. If not, you are better off with our 91mm TB and perhaps a controller as well. Please check us out. Don't hesitate to call or post with questions.
__________________
Soler Performance LLC
support@solerengineering.com
www.solerengineering.com
(251) 468-9786
Soler Performance LLC
support@solerengineering.com
www.solerengineering.com
(251) 468-9786
Racer
Joined: Feb 2020
Posts: 377
Likes: 435
Your 2 options are the factory 87 (ported to 91) or a LT5 95mm (ported to 100).
Porting the IM to accommodate a 95 is tricky, some places will bevel port the snout to match a 95 but towards the inside of the snout it tapers back in the back to 90ish because it's too thin. You could break out the epoxy if you breach the wall trying to maximize it. No gasket so you may need to RTV the combo also
I have ported my 87 and my IM...the dyno showed a kpa very close to 100 thru the pull, meaning it was not drawing vacuum. My gains were 10-15 on multiple runs (with headers) so their is some gains to be had.
Side note; my buddy has the CarbonR/ported95 on his car, from the screenshots I saw his gains were 15 too. I will confirm that though when I see him this week and report back.
Porting the IM to accommodate a 95 is tricky, some places will bevel port the snout to match a 95 but towards the inside of the snout it tapers back in the back to 90ish because it's too thin. You could break out the epoxy if you breach the wall trying to maximize it. No gasket so you may need to RTV the combo also
I have ported my 87 and my IM...the dyno showed a kpa very close to 100 thru the pull, meaning it was not drawing vacuum. My gains were 10-15 on multiple runs (with headers) so their is some gains to be had.
Side note; my buddy has the CarbonR/ported95 on his car, from the screenshots I saw his gains were 15 too. I will confirm that though when I see him this week and report back.
Race Director
Joined: Jan 2014
Posts: 10,709
Likes: 7,100
From: Fulshear, TX
I did Soler 91mm TB + SoCal Porting ported intake manifold: https://www.corvetteforum.com/forums...post1604047779
Pics of each in that thread, but those are the two shops I'd suggest for the work. Soler Performance's machine work on the OEM throttle body is 2nd to none in my personal opinion (I tried multiple on my C7) and Ruben @ SoCal Porting does impressive work to these plastic composite manifolds removing all the flaws, imperfections, & manufacturing marks while smoothing the transitions and maximizing flow/efficiency (again, tried multiple on my C7 and various other sports cars). Wilson has a solid manifold design, but my 2-cents is you're paying a premium for the name and getting a little less personal attention to detail.
Pics of each in that thread, but those are the two shops I'd suggest for the work. Soler Performance's machine work on the OEM throttle body is 2nd to none in my personal opinion (I tried multiple on my C7) and Ruben @ SoCal Porting does impressive work to these plastic composite manifolds removing all the flaws, imperfections, & manufacturing marks while smoothing the transitions and maximizing flow/efficiency (again, tried multiple on my C7 and various other sports cars). Wilson has a solid manifold design, but my 2-cents is you're paying a premium for the name and getting a little less personal attention to detail.
Last edited by Kracka; Sep 21, 2021 at 04:15 PM.
