Repairing intake manifold fuel distribution issues

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Re: Repairing intake manifold fuel distribution issues

Post by jmarkaudio » Mon Apr 16, 2018 9:39 am

pamotorman wrote:
Sun Apr 15, 2018 9:07 am
swampbuggy wrote:
Sun Apr 15, 2018 8:47 am
Thanks PAMOTORMAN !!! :D
i remember a dyno test at the GM tech center on a NASCAR engine to get equal fuel distribution. the same engine in the race car at Daytona the plugs looked like they came out of 8 different engines. the G forces in the turns have a lot to do with the fuel distribution when using a carb. now you know why NASCAR went to electronic FI
NASCAR teams went to FI because they were forced to, Ask Warp Speed if that was a choice they would have made willingly...
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Re: Repairing intake manifold fuel distribution issues

Post by pamotorman » Mon Apr 16, 2018 11:18 am

jmarkaudio wrote:
Mon Apr 16, 2018 9:39 am
pamotorman wrote:
Sun Apr 15, 2018 9:07 am
swampbuggy wrote:
Sun Apr 15, 2018 8:47 am
Thanks PAMOTORMAN !!! :D
i remember a dyno test at the GM tech center on a NASCAR engine to get equal fuel distribution. the same engine in the race car at Daytona the plugs looked like they came out of 8 different engines. the G forces in the turns have a lot to do with the fuel distribution when using a carb. now you know why NASCAR went to electronic FI
NASCAR teams went to FI because they were forced to, Ask Warp Speed if that was a choice they would have made willingly...
the OEM wanted FI because their race team engineeers were not learning any thing new while NASCAR used carbs but FI did make it easier to tune the engines for performance and durability. it made the adjustmens for ignition timing and fuel flow for each cylinder a lot easier...

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Re: Repairing intake manifold fuel distribution issues

Post by Tuner » Mon Apr 16, 2018 12:16 pm

Did you ever think of this? With EFI, the NASCAR version of OnStar gives Brian France et al a joystick with live control of who has power or not during the progress of a race, a virtual restrictor plate adjustable on the fly.

All else equal, carburetors still make more power.

:lol:

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Re: Repairing intake manifold fuel distribution issues

Post by BILL-C » Mon Apr 16, 2018 12:47 pm

Big Speed wrote:
Sun Apr 15, 2018 6:51 pm
WE dyno with 8 o2s on most builds.Will shape runner entry to grab or shear off more fuel.Sometimes will put dam in adjacent port if it is much richer..Firing order does influence distribution.Bill C.
I agree 100 %
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Re: Repairing intake manifold fuel distribution issues

Post by pamotorman » Mon Apr 16, 2018 1:23 pm

Tuner wrote:
Mon Apr 16, 2018 12:16 pm
Did you ever think of this? With EFI, the NASCAR version of OnStar gives Brian France et al a joystick with live control of who has power or not during the progress of a race, a virtual restrictor plate adjustable on the fly.

All else equal, carburetors still make more power.

:lol:
i believe were the nozzles are placed determines the HP and that is why NASCAR has a spec for that.

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Re: Repairing intake manifold fuel distribution issues

Post by pamotorman » Mon Apr 16, 2018 4:36 pm

Tuner wrote:
Mon Apr 16, 2018 12:16 pm
Did you ever think of this? With EFI, the NASCAR version of OnStar gives Brian France et al a joystick with live control of who has power or not during the progress of a race, a virtual restrictor plate adjustable on the fly.

All else equal, carburetors still make more power.

:lol:
i would think that NASCAR would worry that the crew chief could do this. maybe that is why it took so long for NASCAR to agree to FI

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Re: Repairing intake manifold fuel distribution issues

Post by Cubic_Cleveland » Sat Apr 21, 2018 4:41 am

pamotorman wrote:
Mon Apr 16, 2018 4:36 pm
Tuner wrote:
Mon Apr 16, 2018 12:16 pm
Did you ever think of this? With EFI, the NASCAR version of OnStar gives Brian France et al a joystick with live control of who has power or not during the progress of a race, a virtual restrictor plate adjustable on the fly.

All else equal, carburetors still make more power.

:lol:
i would think that NASCAR would worry that the crew chief could do this. maybe that is why it took so long for NASCAR to agree to FI
Getting really off topic, but you can’t adjust fuel trim during the race in NASCAR?? Conserve fuel and deal with reduced power for a pit stop advantage? Or give it full fuel even if you might not make it to the finish and hope for a safety car (therefore conserve fuel running behind it)?

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Re: Repairing intake manifold fuel distribution issues

Post by Tuner » Wed Apr 25, 2018 2:25 am

Give one man control of every car's ignition timing and he can control who wins the race. Who can you think of that would like to do that. Honda engineers were tuning their engines on the track during the Indy 500, live by satellite, decades ago

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Re: Repairing intake manifold fuel distribution issues

Post by pamotorman » Wed Apr 25, 2018 8:28 am

Tuner wrote:
Wed Apr 25, 2018 2:25 am
Give one man control of every car's ignition timing and he can control who wins the race. Who can you think of that would like to do that. Honda engineers were tuning their engines on the track during the Indy 500, live by satellite, decades ago
the ECM would have to be set up to do over the air updates to do that.

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Re: Repairing intake manifold fuel distribution issues

Post by grandsport51 » Wed Apr 25, 2018 9:31 am

Check this out use of telemetry in F-1

http://www.formula1-dictionary.net/telemetry.html

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Re: Repairing intake manifold fuel distribution issues

Post by Tuner » Thu Apr 26, 2018 12:05 pm

grandsport51 wrote:
Wed Apr 25, 2018 9:31 am
Check this out use of telemetry in F-1

http://www.formula1-dictionary.net/telemetry.html

Dave B
Interesting reading in the link. McLaren supplies ECUs to F1 and NASCAR.
In 2002 two-way telemetry was permitted so engineers could change settings on the cars from the pits. This is no longer allowed, but much was learned.

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