TeeLew
Well-Known Member
I think the 18-up hoods with the faux reverse vents push you to put them there.Huh, so the instructions have evolved.
It used to be right at or a couple inches behind the rad backside.
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I think the 18-up hoods with the faux reverse vents push you to put them there.Huh, so the instructions have evolved.
It used to be right at or a couple inches behind the rad backside.
Well the do look cool on a GT, so theres that reason. The air that’s escaping through the hood vents not that gigh velocity so I wouldnt think its more tha a couple lbs or df at most (below 90 or 100 anyway).Is there any reason to install hood vents if cooling is not an issue? I think there is a negligible DF increase, but if cooling is no issue, why cut vents?
I'd be careful calling it negligible. It's probably not much in a second gear corner, but I bet it makes a noticeable difference in a 4th gear corner. I've felt it on other cars and it wasn't nothing.Is there any reason to install hood vents if cooling is not an issue? I think there is a negligible DF increase, but if cooling is no issue, why cut vents?
Are the 15-17 and 18 and up hoods interchangeable on the non-Shelby models?I'd be careful calling it negligible. It's probably not much in a second gear corner, but I bet it makes a noticeable difference in a 4th gear corner. I've felt it on other cars and it wasn't nothing.
I think the cooling advantage is the real justification, like kz says.
I haven't put the vents in, but I think I might get a 15-17 hood if I do. The 18-up hoods are kinda clunky.
I'm not sure. The fenders might be a little different.Are the 15-17 and 18 and up hoods interchangeable on the non-Shelby models?
This is sort of what I was thinking. Since it's the CAMC thread, so I didn't want to pollute it with non-CAMC stuff. BUT, I noticed this weekend (On 4th gear corners), that my hood had a bit (okay a lot) of wiggle. I was thinking vents MIGHT reduce this uplift (thereby increasing downforce). I was actually considering fender vents before hood vents to accomplish the same thing with the high pressure in the wheel wells too.I'd be careful calling it negligible. It's probably not much in a second gear corner, but I bet it makes a noticeable difference in a 4th gear corner. I've felt it on other cars and it wasn't nothing.
I think the cooling advantage is the real justification, like kz says.
I haven't put the vents in, but I think I might get a 15-17 hood if I do. The 18-up hoods are kinda clunky.
I never had timing pulled, and my 350R instructor said he's seen 250 CHT's and 290 oil temp with no timing pulled as well. Since he's been doing this as long as I've had a drivers license, I trust he knows what pulled timing feels like.I'd argue cooling is an issue - especially (ironically) - in autocross - if you run with short intervals in which you just sit in grid, you'll start seeing intake temps of ~150F (especially with open airbox which is hot air intake) at which you run into timing being pulled territory - vents don't help that much when stationary but they help a lot when moving.
Pro Solos - when it's hot - same issue - you run, sit for 4 minutes crawling to start and then do it 3 more times. I've seen 225F CHT yesterday coming through the finish of 1st run in Cleveland at 70F ambient.
Also, ended up in 2nd in that Pro behind CAM-T car - which has quite softer index (since CAM in Pro is index class). Contingency from Hawk incoming, pure profit this whole autocross business.
Anyway.
@NightmareMoon - Airbox works great, don't think the kit has all the right parts to bolt the two pieces together but I had open box from Ford Performance so between the two I made it work with no problem. It definitely slows the rise of IAT down
I remember Lund saying somehere 250 CHT was a threshold of timing pulled but not 100% sure on the exact number. Either way, cooler or not so hot of an engine can't hurt.I never had timing pulled, and my 350R instructor said he's seen 250 CHT's and 290 oil temp with no timing pulled as well. Since he's been doing this as long as I've had a drivers license, I trust he knows what pulled timing feels like.
This is sort of what I was thinking. Since it's the CAMC thread, so I didn't want to pollute it with non-CAMC stuff. BUT, I noticed this weekend (On 4th gear corners), that my hood had a bit (okay a lot) of wiggle. I was thinking vents MIGHT reduce this uplift (thereby increasing downforce). I was actually considering fender vents before hood vents to accomplish the same thing with the high pressure in the wheel wells too.
It sounds like hood vents might be my answer. I didn't want to cut if I wasn't going to get any appreciable DF gain/uplift reduction. I appreciate the response.
If it's not pulling timing at 250 CHT, then you probably could have had more at 200. Beyond the increased likelihood to run into knock issues, the intake air temps are bound to be through the roof when temps get that high.I never had timing pulled, and my 350R instructor said he's seen 250 CHT's and 290 oil temp with no timing pulled as well. Since he's been doing this as long as I've had a drivers license, I trust he knows what pulled timing feels like.
Do you have weatherstripping on the top of the headlights to help limit the underhood airflow? That really does help.This is sort of what I was thinking. Since it's the CAMC thread, so I didn't want to pollute it with non-CAMC stuff. BUT, I noticed this weekend (On 4th gear corners), that my hood had a bit (okay a lot) of wiggle.