What are the disadvantages of Overjetting
May 10, 2011, 11:01 AM
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What are the disadvantages of Overjetting
Hi guys can you tell me of the disadvantages of having spraying too much meth? Are there any signs? I have an HFS5 with 2 x 1.0mm jets running 100%meth. My IDC at 33psi is around 80% on the fic1050cc injectors. Also, is it normal for the car to run richer in 1st and 2nd gear and be fine in 3rd? I get some spark blowout when it hit the rev limit only in 1st and 2nd but not in 3rd. The car is obviously tuned in 3rd gear to the 11.5 afrs and doesnt blowout but the lower gears run more rich( 10.9). Any help would be appreciated. OHH, I have a SpoolinUp COP with BKR7e plugs gapped to .020
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May 10, 2011, 02:47 PM
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One of the disadvantages to running too much meth is that the car is so heavily dependent on it for fuel that if/when a failure occurs (blocked nozzle, pump failure, run out of meth...hopefully you have a very good failsafe in place) the car is going to go way lean...what does 2x1.0mm jets equate to in cc/min?
May 10, 2011, 04:16 PM
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One of the disadvantages to running too much meth is that the car is so heavily dependent on it for fuel that if/when a failure occurs (blocked nozzle, pump failure, run out of meth...hopefully you have a very good failsafe in place) the car is going to go way lean...what does 2x1.0mm jets equate to in cc/min?
about 1000cc i think
May 11, 2011, 06:44 AM
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I'm not familiar with the HFS-5, but i know the 6 had many adjustments you could make via the control box.
For example, you could make the flow come on at50% IDC and flow at 25% capacity but make it match IDC % by the time IDC was at 80%.
Or, for example, you could make it come on at 70% IDC and flow at 80%. etc etc.
But being able to fine tune it takes a lot of practice and if you're not logging flow, a lot of trial and error.
I still don't know how to make it run properly in multiple gears. I THINK you could hit (for example) IDC of 50% much earlier in RPM in 5th gear than in, say, 1st. So your meth may trigger at 5k RPMS in 1st gear and 4k RPMS in 5th gear (because of more low end boost) and end up making AFR's too rich.
I'm really not sure.
For example, you could make the flow come on at50% IDC and flow at 25% capacity but make it match IDC % by the time IDC was at 80%.
Or, for example, you could make it come on at 70% IDC and flow at 80%. etc etc.
But being able to fine tune it takes a lot of practice and if you're not logging flow, a lot of trial and error.
I still don't know how to make it run properly in multiple gears. I THINK you could hit (for example) IDC of 50% much earlier in RPM in 5th gear than in, say, 1st. So your meth may trigger at 5k RPMS in 1st gear and 4k RPMS in 5th gear (because of more low end boost) and end up making AFR's too rich.
I'm really not sure.
May 11, 2011, 03:22 PM
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I'm not familiar with the HFS-5, but i know the 6 had many adjustments you could make via the control box.
For example, you could make the flow come on at50% IDC and flow at 25% capacity but make it match IDC % by the time IDC was at 80%.
Or, for example, you could make it come on at 70% IDC and flow at 80%. etc etc.
But being able to fine tune it takes a lot of practice and if you're not logging flow, a lot of trial and error.
I still don't know how to make it run properly in multiple gears. I THINK you could hit (for example) IDC of 50% much earlier in RPM in 5th gear than in, say, 1st. So your meth may trigger at 5k RPMS in 1st gear and 4k RPMS in 5th gear (because of more low end boost) and end up making AFR's too rich.
I'm really not sure.
For example, you could make the flow come on at50% IDC and flow at 25% capacity but make it match IDC % by the time IDC was at 80%.
Or, for example, you could make it come on at 70% IDC and flow at 80%. etc etc.
But being able to fine tune it takes a lot of practice and if you're not logging flow, a lot of trial and error.
I still don't know how to make it run properly in multiple gears. I THINK you could hit (for example) IDC of 50% much earlier in RPM in 5th gear than in, say, 1st. So your meth may trigger at 5k RPMS in 1st gear and 4k RPMS in 5th gear (because of more low end boost) and end up making AFR's too rich.
I'm really not sure.
Seems like its more obvious with the 2 big jets since most other guys here are using 1 and not having the issue. I dunno
May 11, 2011, 03:30 PM
#7
Hi guys can you tell me of the disadvantages of having spraying too much meth? Are there any signs? I have an HFS5 with 2 x 1.0mm jets running 100%meth. My IDC at 33psi is around 80% on the fic1050cc injectors. Also, is it normal for the car to run richer in 1st and 2nd gear and be fine in 3rd? I get some spark blowout when it hit the rev limit only in 1st and 2nd but not in 3rd. The car is obviously tuned in 3rd gear to the 11.5 afrs and doesnt blowout but the lower gears run more rich( 10.9). Any help would be appreciated. OHH, I have a SpoolinUp COP with BKR7e plugs gapped to .020
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May 11, 2011, 03:35 PM
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The HFS5 is progressive. It happens if i stay on the rev limit too long in 1 st and 2nd. Its hard not to in 1st and 2nd at 600whp
as it gets there so quickly. Should I try Iridiums with a .018 gap?
May 11, 2011, 05:33 PM
#9
I believe that you can alter the Hfs-5 to be on/off. I was just making sure.
It sounds like the car might just be cutting out on you for sitting on the limiter. When attempting to pass the traps on a local 1/8th mi. track. I would hit the limiter at the finish line and it would pop and then cut out completely if I did not let off.
It sounds like the car might just be cutting out on you for sitting on the limiter. When attempting to pass the traps on a local 1/8th mi. track. I would hit the limiter at the finish line and it would pop and then cut out completely if I did not let off.
May 11, 2011, 05:41 PM
#10
I run two 1mm jets. I am currently considering fully removing the restrictor and adding a third jet. There is a member on here who uses 6 jets! I used to run wayyy to rich before I started tuning my own car. When I finally purchased my own wideband. I found my afr would dip deep into the 9s. I was running a 1mm and .8mm with a hfs 1. It would kick at 12psi and spray full blast. My fuel map looked like the rocky mountains ran through it. Lol
May 11, 2011, 07:03 PM
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[quote=mt057;9312094]I run two 1mm jets. I am currently considering fully removing the restrictor and adding a third jet. There is a member on here who uses 6 jets! I used to run wayyy to rich before I started tuning my own car. When I finally purchased my own wideband. I found my afr would dip deep into the 9s. I was running a 1mm and .8mm with a hfs 1. It would kick at 12psi and spray full blast. My fuel map looked like the rocky mountains ran through it. Lol[/quote
Im gonna swap out the 1mm jet closest to the throttlebody for a .8mm and see what happens
Im gonna swap out the 1mm jet closest to the throttlebody for a .8mm and see what happens
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