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Old 02-12-2020, 02:53 AM   #1
ariZona28
 
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LS7 shift points

Expanding on a thread posted by another member. What are your shift points for maximum acceleration and enjoyment? I throw the lever at about 6800 RPM and my completely stock engine is still pulling VERY hard. Curious as to how high these powerplants will spin before things get scary. Looking to hear from stock and modified folks.
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Old 02-12-2020, 07:45 AM   #2
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When I ran my Z at drag strip last summer ( yea I know, I track too ) I experimented with shift points. Bone stock, shifting at 6500 vs 7000 netted the same mph trap speed in the 1/8 and the 1/4. Got my best pass shifting at 6500, 12.22 @ 116.5, 1200 DA. Considering stock peak HP is about 6200 or so, there is really no point in revving to 7000. Optimal acceleration will occur when u keep the engine between peak trq and peak hp. Once the car is modified, revving higher may be beneficial.
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Old 02-12-2020, 08:44 AM   #3
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Originally Posted by MX621 View Post
When I ran my Z at drag strip last summer ( yea I know, I track too ) I experimented with shift points. Bone stock, shifting at 6500 vs 7000 netted the same mph trap speed in the 1/8 and the 1/4. Got my best pass shifting at 6500, 12.22 @ 116.5, 1200 DA. Considering stock peak HP is about 6200 or so, there is really no point in revving to 7000. Optimal acceleration will occur when u keep the engine between peak trq and peak hp. Once the car is modified, revving higher may be beneficial.
I try to adhere to this at the track (road courses) unless there is a point at which the up shift/down shift would need to be done within a few hundred feet -- than I might go a bit beyond 6500.
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Old 02-12-2020, 09:19 AM   #4
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With my current build, my limiter is 7200 but definitely could go higher. It pulls the entire way and doesn't want to stop.

That said, I rarely bounce it off the limiter when tracking. I usually just go by sound and feel based on where I am on the track, but it's definitely around the 7k mark or just beyond.
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Old 02-12-2020, 11:34 AM   #5
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MX621,Wow, low 12s, over 116 "real world" on stock engine. Just the info I was looking for. Has car ever been on dyno? I know they make 505/481 at crank. Curious what bone stock RWHP is.
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Old 02-12-2020, 11:55 AM   #6
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MX621,Wow, low 12s, over 116 "real world" on stock engine. Just the info I was looking for. Has car ever been on dyno? I know they make 505/481 at crank. Curious what bone stock RWHP is.
I'd like to know the RWHP of a completely stock engine too. As a reference point - Car & Driver got a 12.7 @ 116 MPH quarter mile and Motortrend got a 12.3 @ 117.2 quarter mile when tested in 2014.
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Old 02-12-2020, 12:38 PM   #7
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MX621,Wow, low 12s, over 116 "real world" on stock engine. Just the info I was looking for. Has car ever been on dyno? I know they make 505/481 at crank. Curious what bone stock RWHP is.
Car made 463/436 STD correction on Raceproven Motorsports dyno jet bone stock. That converted to 451whp SAE. During the drag strip pass DA was about +1200Ft and my gas tank was almost completely full. I wish I had prepared better and ran it with around a 1/4 tank.
Car went 12.22 @ 116.4mph, 1.95 60ft.
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Old 02-12-2020, 04:42 PM   #8
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Originally Posted by Biergut View Post
I'd like to know the RWHP of a completely stock engine too. As a reference point - Car & Driver got a 12.7 @ 116 MPH quarter mile and Motortrend got a 12.3 @ 117.2 quarter mile when tested in 2014.

Different dynos get different results and even air pressure and condition of tires can make a significant difference. That said, my stock engine put down 437 RWP (on a Dynojet, I believe) just before I had it modified. After the mods I was at 588 (same dyno). Torque was at 399 ft-lbs stock and 496 after mods.

Btw, the guy who did the mods said that with a very capable driver (i.e. better than C&D and MT guys...) and right tires that it should be capable of high 10s in the 1/4.
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Old 02-12-2020, 04:46 PM   #9
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Originally Posted by JUSTIFIED View Post
Different dynos get different results and even air pressure and condition of tires can make a significant difference. That said, my stock engine put down 437 RWP (on a Dynojet, I believe) just before I had it modified. After the mods I was at 588 (same dyno). Torque was at 399 ft-lbs stock and 496 after mods.

Btw, the guy who did the mods said that with a good driver and right tires that it should be capable of high 10s in the 1/4.
Thanks. Now I feel inadequate.
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Old 02-13-2020, 02:14 AM   #10
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Quote:
Originally Posted by JUSTIFIED View Post
Different dynos get different results and even air pressure and condition of tires can make a significant difference. That said, my stock engine put down 437 RWP (on a Dynojet, I believe) just before I had it modified. After the mods I was at 588 (same dyno). Torque was at 399 ft-lbs stock and 496 after mods.

Btw, the guy who did the mods said that with a very capable driver (i.e. better than C&D and MT guys...) and right tires that it should be capable of high 10s in the 1/4.
I believe with that power it can go high 10's.

However with the track oriented suspension and how stiff this thing is it's very hard to launch, traction would be a big issue.

I'm somewhere around 560-580 RWHP (still have to dyno it) and I break the tires loose top of 2nd gear and going into 3rd on highway rolls. That can also be because my tires are pretty shot too lol.
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Old 02-13-2020, 04:01 AM   #11
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Ported lingfelter heads B.T.Cam headers536 RWH. All work done by Tom Wong Vancouver.
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