List your mods and at what shift RPM do you get your best ET and MPH at? If you have have them, list comparative runs with different shift points so others have something to compare with what their cars are doing.

Joe

PS. I haven't been to the track with my car and I'm curious what to expect with different shift points. I CAN'T do a Title change on the thread but let's just open this up to all LT1 engined cars regardless of your mods! Just give a thorough description of your modifications if they aren't in your Signature!

 

Stock valve springs or decent ones?

 

On stock valvesprings and rockers I shift at 6000-6100 by the factory tach for best ET and mph. If I shift at 5200 which is stock I lose a half second. I definitely feel the valve float though, and am excited to test my new 918s and 1.6 NSA cranes

 

Only time to change shift points is if you change the breathing characteristics of the engine (ie valve timing).

 

Or you get a tune and add timing

 

To get this back on track so to speak. Can you list your mods and what your best shift points are through testing them on the track?

Every car and combination are going to have a "Best RPM to Shift At" and I am curious what yours are not debate why this that or the other!

Joe

 

Mods in sig

 

It's all subjective depending on the car...somebody with a 6spd, 3200lb Corvette, with 4.10 gears is going to have different optimal shift points than auto, 4000lb Caprice, with 3.23's......even more so when you start changing valve springs, roller rockers allowing it to rev a few hundred RPM more without terrible valve float. You need to be more specific or it's an apple to oranges comparison.

 

NO KIDDING!

It continues to amaze me why people never respond to the intent of a thread and/or question posed and have to respond with the obvious statement that you can't compare apples to oranges!

Quite possibly if people would post their mods and what shift points gave them their best times someone with a similar set up they could compare their apple to another apple so to speak!

Joe

 

Bench racing is lame....take it to the track and find out first hand!


lol...5900 rpm no matter what...that what you wanted to hear?

 

No, What I wanted to read are peoples real world experiences with their cars not some comments that are so obvious that they don't need to be said!

 

So far Archie you have made three posts and not one has answered the intent of this thread! Why waste yours and everyone else's time?

 

When I had my LT4 Hot Cam with AFR 180cc heads, 3.73 gears, 3500 stall, and Pacesetter mids I shifted the car at 6250rpm and ran 11.98 at 115 1.68 60ft..

 

Bolt-on's 3900 lbs, 1-2 shift 6-6100, 2-3 5900. Anything less and I run 13's.

 

He asked boltons only no heads/cam

 

Where's your power peak?

 

1-2 6250 2-3 6100............... Cant really give much info on before when shifts were slightly less do the fact it was 50ish out verses 79 or so when I ran some 12.8-12.9's at 106ish with lower shift points. Also my best times were with my trans having somewhat of a lazy 2-3 shift.

 

I hope this helps. Many many years ago when my 94 Formula was just bolt ons (AS&M Headers, CAI, 3.73 gears, 2400 Stall) I was shifting about 6100 RPM. It's a full weight car and was cutting 1.9-2.0 60' times on street tires, I was running 13.3 @ 105. I was told by numerous people that I was shifting too high. I put it back to stock shift points and ran a 14.0 @ 100. I tweaked each shift point and ended back at the 6100 I was at before. I'm not saying that is best but it was best in my situation.

 

You are correct but at least you and these guys answering in the way I was hoping this thread would go so let's just see everyones answers!

Thanks guys!

Joe

 

As far as the fastest Bolton guys who frequently post here (me, camaroracing12, lt1 xjs etc) we all shift around 6000-6100. I don't think any of us have hit a dyno but we have all made a lot of track passes. Common knowledge is now that a full bolton lt1 shifting at 6000 rpm with good tires and a good driver WILL run mid to high 12s in under 2000 DA. If you can't run 12s in under 2000 DA with full boltons, your opti is broken.