Here is one picture. I will try and find one of the intake. 
And here is the intake setup. 
LS7 shift point questions. What do you shift at?????
Thread Starter
Launching!
Joined: Dec 2007
Posts: 255
Likes: 4
From: greenbrier tn
LS7 shift point questions. What do you shift at????? I have a LS7 motor in my 32 truck. I have headers, custom grind cam motion cam. Trunnion up grade. The cam size is between a BTR stage 3 and a BTR stage 4. 240/252, 654/ 640 113 +3. My heads have been fixed by WCCH. But I did not mill them. And I have a tune. My rev limiter is set at 7500. I was shifting at 6300RPMs before the new cam, and trunnion up grade. I run a tb400 manual valve body. So I can shift where I want to. I am going to try a higher shift point. SO I WAS WONDERING WHAT YOU GUYS SHIFT AT ? At the track. Thanks Robert
Have you dyno'd it? If so knowing where your peak is gives you a good starting point, also just knowing whether it carries or falls off entirely after that peak, otherwise just rev it till you feel it fall off, mark that rpm then shift just before that.
Thread Starter
Launching!
Joined: Dec 2007
Posts: 255
Likes: 4
From: greenbrier tn
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
Launching!
Joined: Dec 2007
Posts: 255
Likes: 4
From: greenbrier tn
TECH Enthusiast
Joined: Jul 2019
Posts: 636
Likes: 187
Given the 2.48 1st and 1.48 second, plus your setup peaking at 7k, you'll probably want to wind it up as much as you're comfortable in first. 2-3 most likely the same. Remember you want as much torque as possible so depending on how quick your motor falls off up top and what is makes down around 4k will be the deciding factor.
Staging Lane
Joined: Feb 2017
Posts: 63
Likes: 14
From: Leola PA
Given the 2.48 1st and 1.48 second, plus your setup peaking at 7k, you'll probably want to wind it up as much as you're comfortable in first. 2-3 most likely the same. Remember you want as much torque as possible so depending on how quick your motor falls off up top and what is makes down around 4k will be the deciding factor.
Staging Lane
Joined: Feb 2017
Posts: 63
Likes: 14
From: Leola PA
I have always shifted at 6800 or 7000 (just touching the rev limiter). So I guess I've been pretty close just by guessing. Best et 10.29 @ 130, 3300 lbs, 3.90 rear gears. Through full exhaust, driven to the track.
The linked calculator explains a bit of the theory behind optimizing shift points for acceleration. Basic physics -- F = M x A A is acceleration, M is Mass and F is force. The force applied to the pavement by the tires comes from the torque created by the engine/gearing. So to maximize A (acceleration) the goal is to be able to shift gears in a way where the highest AVERAGE F (torque) is applied across the entire 1/4 mile run. The results can be a bit counterintuitive depending on the torque curve of the engine and the gearing splits. I'll just say more sub-optimal ET's have been run by shifting at too high an rpm than by shifting too low.
Back in the day, spent a bit of time road racing SCCA Show Room Stock C4 Corvettes. Peak hp at 4000-4200 rpm; peak torque at 3200 rpm. You could hold 'em to 4500, 5000 even 5500 rpm (5500 where the redline showed up on the digital tach). And there were drivers that thought higher revs must be faster - you should shift at redline, right? If you were running by yourself and not worried about having to defend a pass or making a pass (qualifying) - out best lap times came shifting the cars at about 4000 rpm. Pushing them higher than that made more noise and you went slower. Sounds exciting doesn't it. The old smog motors were more like diesels.
Back in the day, spent a bit of time road racing SCCA Show Room Stock C4 Corvettes. Peak hp at 4000-4200 rpm; peak torque at 3200 rpm. You could hold 'em to 4500, 5000 even 5500 rpm (5500 where the redline showed up on the digital tach). And there were drivers that thought higher revs must be faster - you should shift at redline, right? If you were running by yourself and not worried about having to defend a pass or making a pass (qualifying) - out best lap times came shifting the cars at about 4000 rpm. Pushing them higher than that made more noise and you went slower. Sounds exciting doesn't it. The old smog motors were more like diesels.
I have an LS7 with a similar cam (240/254 114+3). The torque swells above 5K rpm and you can feel the extra push. I usually shift somewhere between 6800 - 7000 rpm. Yours might carry higher with the single plane intake, but I have little better heads so who knows. Mine feels like it's starting to tap out around 7300 rpm. I think maybe the practical limit of a SBE LS7 is 7500 rpm (?). I'm not a real racer though, I don't beat on my stuff too hard and I'd rather it hold together than chase after a few tenths.
Thread Starter
Launching!
Joined: Dec 2007
Posts: 255
Likes: 4
From: greenbrier tn
I have an LS7 with a similar cam (240/254 114+3). The torque swells above 5K rpm and you can feel the extra push. I usually shift somewhere between 6800 - 7000 rpm. Yours might carry higher with the single plane intake, but I have little better heads so who knows. Mine feels like it's starting to tap out around 7300 rpm. I think maybe the practical limit of a SBE LS7 is 7500 rpm (?). I'm not a real racer though, I don't beat on my stuff too hard and I'd rather it hold together than chase after a few tenths.