SMX5 Opposed to Single-Source Engine
#38823 from Cliff Ebben · No action required · Minutes (2025-10 Fastrack)
Thank you for your detailed response. Please see letter #38969 in September 2025 Fastrack.
BoP Lab / Drivers / Cliff Ebben
| Track | Class | Sessions | Typical gap to class best | Closest |
|---|---|---|---|---|
| Road America (4.05 mi) | GT1 | 34 | +0.784s (0.62%) | +0.000s (0.00%) |
| Indianapolis Motor Speedway (2.59 mi) | GT1 | 5 | +0.133s (0.14%) | +0.000s (0.00%) |
| Mid-Ohio Sports Car Course (2.26 mi) | GT1 | 5 | +0.000s (0.00%) | +0.000s (0.00%) |
| Unknown track (2.14 mi) | GT1 | 2 | +0.000s (0.00%) | +0.000s (0.00%) |
| Blackhawk Farms Raceway (1.95 mi) | GT1 | 2 | +0.000s (0.00%) | +0.000s (0.00%) |
Gap is the driver's best lap in a session against the fastest lap in their class in that same session (zero is fastest in class), shown as time lost and as a share of the lap, so conditions cancel out and tracks can be compared. Typical is the median session.
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| June Sprints 2023 | Grp 8 AS,GT1,GT2,GT3,GTX,T1 Race 2 | GT1 | 66 | Ford Mustang | 4/4 | 2:12.031 | 2:11.544Dave Ruehlow | +0.487s (0.37%) | 160.01/4 | 160.0Dave Ruehlow | +0.0 mph (0.0%) |
| June Sprints 2023 | Grp 8 AS,GT1,GT2,GT3,GTX,T1 Race 1 | GT1 | 66 | Ford Mustang | 2/12 | 2:07.664 | 2:07.664you | +0.000s (0.00%) | 168.61/12 | 168.6you | +0.0 mph (0.0%) |
| June Sprints 2023 | Grp 8 AS,GT1,GT2,GT3,GTX,T1 Qual 2 | GT1 | 66 | Ford Mustang | 2/11 | 2:08.054 | 2:07.270Dave Ruehlow | +0.784s (0.62%) | 171.82/11 | 179.3Dave Ruehlow | -7.5 mph (-4.2%) |
| June Sprints 2023 | Grp 8 AS,GT1,GT2,GT3,GTX,T1 Qual 1 | GT1 | 66 | Ford Mustang | 2/11 | 2:08.376 | 2:06.987Dave Ruehlow | +1.389s (1.09%) | 167.22/11 | 176.2Dave Ruehlow | -9.0 mph (-5.1%) |
| June Sprints 2022 | Grp 6 GT1,GT2,GT3,T1,AS,GTX Race 2 | GT1 | 3 | Ford Mustang | 1/8 | 2:08.553 | 2:08.553you | +0.000s (0.00%) | 171.82/8 | 172.5Joseph Freda | -0.7 mph (-0.4%) |
| June Sprints 2022 | Grp 6 GT1,GT2,GT3,T1,AS,GTX Race 1 | GT1 | 3 | Ford Mustang | 3/10 | 2:07.762 | 2:07.405David Pintaric | +0.357s (0.28%) | 169.62/10 | 172.5David Pintaric | -2.9 mph (-1.7%) |
| June Sprints 2022 | Grp 6 GT1,GT2,GT3,T1,AS,GTX Qual 2 | GT1 | 3 | Ford Mustang | 3/10 | 2:06.919 | 2:04.567David Pintaric | +2.352s (1.89%) | 170.05/10 | 177.4David Pintaric | -7.4 mph (-4.2%) |
| June Sprints 2022 | Grp 6 GT1,GT2,GT3,T1,AS,GTX Qual 1 | GT1 | 3 | Ford Mustang | 3/11 | 2:08.321 | 2:05.817David Pintaric | +2.504s (1.99%) | |||
| June Sprints 2022 | Grp 6 GT1,GT2,GT3,T1,AS,GTX Prac | GT1 | 3 | Ford Mustang | 2/10 | 2:11.606 | 2:10.967David Pintaric | +0.639s (0.49%) | |||
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 8 GT1,GT2,GT3,T1,AS,GTX,PX Race 2 | GT1 | 36 | Ford mustang | 10/10 | 2:14.747 | 2:10.126Misha Goikhberg | +4.621s (3.55%) | |||
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 8 GT1,GT2,GT3,T1,AS,GTX,PX Race 1 | GT1 | 36 | Ford mustang | 2/14 | 2:09.984 | 2:09.984you | +0.000s (0.00%) | |||
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 8 GT1,GT2,GT3,T1,AS,GTX,PX Qual 2 | GT1 | 36 | Ford mustang | 2/14 | 2:09.730 | 2:09.086Dave Ruehlow | +0.644s (0.50%) | |||
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 8 GT1,GT2,GT3,T1,AS,GTX,PX Qual 1 | GT1 | 36 | Ford mustang | 2/12 | 2:09.625 | 2:08.550Dave Ruehlow | +1.075s (0.84%) | |||
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 8 GT1,GT2,GT3,T1,AS,GTX,PX Prac | GT1 | 36 | Ford mustang | 3/11 | 2:11.451 | 2:10.823Dave Ruehlow | +0.628s (0.48%) | |||
| Runoffs 2020 | GT1 Race | GT1 | 36 | Ford Mustang | 3/16 | 2:07.899 | 2:05.282Ernie Francis Jr. | +2.617s (2.09%) | 173.23/16 | 177.0Tony Ave | -3.8 mph (-2.1%) |
| Runoffs 2020 | GT1 Qual 3 | GT1 | 36 | Ford Mustang | 5/16 | 2:06.381 | 2:02.936Ernie Francis Jr. | +3.445s (2.80%) | 176.64/16 | 180.5Simon Gregg | -3.9 mph (-2.2%) |
| Runoffs 2020 | GT1, GT2 Qual 2 | GT1 | 36 | Ford Mustang | 4/15 | 2:07.319 | 2:03.382Ernie Francis Jr. | +3.937s (3.19%) | 174.74/15 | 176.6Tony Ave | -1.9 mph (-1.1%) |
| Runoffs 2020 | GT1, GT2 Qual 1 | GT1 | 36 | Ford Mustang | 4/15 | 2:08.281 | 2:04.382Ernie Francis Jr. | +3.899s (3.13%) | 174.35/15 | 180.1Tony Ave | -5.8 mph (-3.2%) |
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 7 GT1,GT2,GT3,AS,T1 Race 2 | GT1 | 36 | Ford Mustang | 3/7 | 2:07.805 | 2:06.780Tony Ave | +1.025s (0.81%) | 178.11/7 | 178.1Dave Ruehlow | +0.0 mph (0.0%) |
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 7 GT1,GT2,GT3,AS,T1 Race 1 | GT1 | 36 | Ford Mustang | 2/10 | 2:08.336 | 2:07.784Tony Ave | +0.552s (0.43%) | 170.01/10 | 170.0Tony Ave | +0.0 mph (0.0%) |
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 7 GT1,GT2,GT3,AS,T1 Qual 2 | GT1 | 36 | Ford Mustang | 9/8 | 2:07.026Dave Ruehlow | |||||
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 7 GT1,GT2,GT3,AS,T1 Qual 1 | GT1 | 36 | Ford Mustang | 2/10 | 2:07.758 | 2:06.375Tony Ave | +1.383s (1.09%) | 175.52/10 | 176.2Tony Ave | -0.8 mph (-0.4%) |
| Chicago Region Hoosier SCCA Super Tour @ Road America | Grp 7 GT1,GT2,GT3,AS,T1 Practice | GT1 | 36 | Ford Mustang | 2/10 | 2:10.055 | 2:07.539Tony Ave | +2.516s (1.97%) | 177.01/10 | 177.0you | +0.0 mph (0.0%) |
| June Sprints® Hoosier Super Tour (Chicago Region) | Grp 4 GT1,GT2,GT3,T1,AS,GTX Race 2 | GT1 | 36 | Ford Mustang | 2/12 | 2:06.809 | 2:05.480Tony Ave | +1.329s (1.06%) | 175.51/12 | 175.5Tony Ave | +0.0 mph (0.0%) |
| June Sprints® Hoosier Super Tour (Chicago Region) | Grp 4 GT1,GT2,GT3,T1,AS,GTX Race 1 | GT1 | 36 | Ford Mustang | 4/13 | 2:07.471 | 2:06.061Tony Ave | +1.410s (1.12%) | 180.51/13 | 180.5you | +0.0 mph (0.0%) |
| June Sprints® Hoosier Super Tour (Chicago Region) | Grp 4 GT1,GT2,GT3,T1,AS,GTX Qual 2 | GT1 | 36 | Ford Mustang | 3/14 | 2:06.437 | 2:05.624Tony Ave | +0.813s (0.65%) | |||
| June Sprints® Hoosier Super Tour (Chicago Region) | Grp 4 GT1,GT2,GT3,T1,AS,GTX Qual 1 | GT1 | 36 | Ford Mustang | 3/12 | 2:07.433 | 2:06.353Dave Ruehlow | +1.080s (0.85%) | |||
| America 2018 | Grp 7 GT1,GT2,GT3,T1,AS Race 2 | GT1 | 36 | Ford Mustang | 1/8 | 2:08.711 | 2:08.711you | +0.000s (0.00%) | |||
| America 2018 | Grp 7 GT1,GT2,GT3,T1,AS Race 1 | GT1 | 36 | Ford Mustang | 1/10 | 2:09.180 | 2:09.180you | +0.000s (0.00%) | |||
| America 2018 | Grp7 GT1,GT2,GT3,T1,AS Qual 2 | GT1 | 36 | Ford Mustang | 11/10 | 2:09.718Ryan McManus | |||||
| America 2018 | Grp 7 GT1,GT2,GT3,T1,AS Qual 1 | GT1 | 36 | Ford Mustang | 2/12 | 2:08.312 | 2:08.029Dave Ruehlow | +0.283s (0.22%) | |||
| Majors @ Road America | G3 Race 2 | GT1 | 36 | Milw | 2/5 | 2:08.575 | 2:08.575you | +0.000s (0.00%) | |||
| Majors @ Road America | G3 Qualifying 2 | GT1 | 36 | Milw | 1/3 | 2:09.776 | 2:09.776you | +0.000s (0.00%) | |||
| Majors @ Road America | G3 Race 1 | GT1 | 36 | Milw | 1/6 | 2:09.132 | 2:09.132you | +0.000s (0.00%) |
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Runoffs 2017 | GT1 Race | GT1 | 36 | Ford Mustang | 3/16 | 1:36.187 | 1:36.187you | +0.000s (0.00%) | |||
| Runoffs 2017 | Gt1/T1 Qual 4 | GT1 | 36 | Ford Mustang | 2/16 | 1:36.141 | 1:36.008David Pintaric | +0.133s (0.14%) | |||
| Runoffs 2017 | GT1/T1/GT3 Qual 3 | GT1 | 36 | Ford Mustang | 1/15 | 1:36.607 | 1:36.607you | +0.000s (0.00%) | |||
| Runoffs 2017 | GT1/T1/GT3 Qual 2 | GT1 | 36 | Ford Mustang | 14/14 | 2:18.649 | 1:37.001David Pintaric | +41.648s (42.94%) | |||
| Runoffs 2017 | GT1/T1/GT3 Qual 1 | GT1 | 36 | Ford Mustang | 9/15 | 1:45.739 | 1:37.961David Pintaric | +7.778s (7.94%) |
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Runoffs 2016 | GT1 Race | GT1 | 36 | Ford Mustang | 1/7 | 1:22.939 | 1:22.866Michael Lewis | +0.073s (0.09%) | |||
| Runoffs 2016 | GT1/T1 Qual 4 | GT1 | 36 | Ford Mustang | 7/5 | 1:24.316Dave Ruehlow | |||||
| Runoffs 2016 | GT1/T1 Qual 3 | GT1 | 36 | Ford Mustang | 7/5 | 1:23.992Ryan McManus | |||||
| Runoffs 2016 | GT1/T1 Qual 2 | GT1 | 36 | Ford Mustang | 1/8 | 1:21.927 | 1:21.927you | +0.000s (0.00%) | |||
| Runoffs 2016 | GT1/T1 Qual 1 | GT1 | 36 | Ford Mustang | 1/4 | 1:23.606 | 1:23.606you | +0.000s (0.00%) |
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Majors @ GingerMan Raceway | Qualifying Sun | GT1 | 36 | Milw | 1 | ||||||
| Majors @ GingerMan Raceway | Grp 1 Race Sat | GT1 | 36 | Milw | 1/2 | 1:30.721 | 1:30.721you | +0.000s (0.00%) |
| Event | Session | Class | # | Car | Pos | Best lap | Class best | To class best | Trap | Class trap | To class trap |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Majors Apr 2016 | Group 7 Race 2=AS,T1,GT1,GT2,GT3 | GT1 | 36 | Milw | 1/4 | 1:08.363 | 1:08.363you | +0.000s (0.00%) | |||
| Majors Apr 2016 | Group 7 Race 1=AS,T1,GT1,GT2,GT3 | GT1 | 36 | Milw | 1/2 | 1:44.881 | 1:44.881you | +0.000s (0.00%) |
#38823 from Cliff Ebben · No action required · Minutes (2025-10 Fastrack)
Thank you for your detailed response. Please see letter #38969 in September 2025 Fastrack.
#35689 from Cliff Ebben · Not recommended · Minutes (2024-05 Fastrack)
Thank you for your letter. Please see response to letter 35677 in March Fastrack.