When to shift?
Thread Starter
Melting Slicks
Joined: Jun 2009
Posts: 3,109
Likes: 3
From: Naperville/Palm Beach IL/FL
When to shift?
Should you be shifting at 6200ish or where your hp and trq cross on your dyno sheet?
My hp/trq intersect at 5200(which is 640rwhpand 640rwtq) but my hp climbs to about 5800.(659rwhp) on a mustang dyno.
I was just thinking it should be shifting earlier and end of third seems too long at the end of the 1/4.
Last year on 18/19 with invos i did 10.79et at 137mph(560rwhp)
last week on 19/20 with invos i did 10.76et at 129mph(650rwhp) with lots of slipping.
08 LS3 A6 ECS 2200
My hp/trq intersect at 5200(which is 640rwhpand 640rwtq) but my hp climbs to about 5800.(659rwhp) on a mustang dyno.
I was just thinking it should be shifting earlier and end of third seems too long at the end of the 1/4.
Last year on 18/19 with invos i did 10.79et at 137mph(560rwhp)
last week on 19/20 with invos i did 10.76et at 129mph(650rwhp) with lots of slipping.
08 LS3 A6 ECS 2200
Le Mans Master
Joined: Dec 2004
Posts: 5,491
Likes: 806
From: West coast CA
Should you be shifting at 6200ish or where your hp and trq cross on your dyno sheet?
My hp/trq intersect at 5200(which is 640rwhpand 640rwtq) but my hp climbs to about 5800.(659rwhp) on a mustang dyno.
I was just thinking it should be shifting earlier and end of third seems too long at the end of the 1/4.
Last year on 18/19 with invos i did 10.79et at 137mph(560rwhp)
last week on 19/20 with invos i did 10.76et at 129mph(650rwhp) with lots of slipping.
08 LS3 A6 ECS 2200
My hp/trq intersect at 5200(which is 640rwhpand 640rwtq) but my hp climbs to about 5800.(659rwhp) on a mustang dyno.
I was just thinking it should be shifting earlier and end of third seems too long at the end of the 1/4.
Last year on 18/19 with invos i did 10.79et at 137mph(560rwhp)
last week on 19/20 with invos i did 10.76et at 129mph(650rwhp) with lots of slipping.
08 LS3 A6 ECS 2200
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Joined: Oct 2004
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From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
Drew, the problem is that with the extra power you have now your running slower then before because your just spinning down the track more. You need a really beefy tire to plant that kind of power, and a 19" rim is not helping either.
As far as when to shift, what you need to look for is where you have the highest average HP. So if your car goes to 6600, but power starts to fall of at say 6300, it may be in your best interest to still take it to red line to achieve the highest average.
Many people think you want to go to HP peak and shift, but then you go lower in the power range upon shifting, thus lowering your average HP.
So first thing first, get a tire on there thats worthy of the power you make, then take a look at your graph and figure out your shift point.
Nice times BTW!! tens from a street car is great, spinning or not.
As far as when to shift, what you need to look for is where you have the highest average HP. So if your car goes to 6600, but power starts to fall of at say 6300, it may be in your best interest to still take it to red line to achieve the highest average.
Many people think you want to go to HP peak and shift, but then you go lower in the power range upon shifting, thus lowering your average HP.
So first thing first, get a tire on there thats worthy of the power you make, then take a look at your graph and figure out your shift point.
Nice times BTW!! tens from a street car is great, spinning or not.
Thread Starter
Melting Slicks
Joined: Jun 2009
Posts: 3,109
Likes: 3
From: Naperville/Palm Beach IL/FL
That makes sense Doug. 3rd seems to wind out too far.
Im going this weekend with some stickies.
I will put up a video of last week so you can see my car go into limp mode then kick back in and still in the 10's.
The dash said active handling something.
Im going this weekend with some stickies.
I will put up a video of last week so you can see my car go into limp mode then kick back in and still in the 10's.
The dash said active handling something.
