jayyyw

I was just saying, its cheaper to do a tire swap and see how it affects your times in 2nd and 3rd. That will tell you if its worth changing trans ratios. I'm shifting at about 87-8800 and was falling back to 63-6400 with the 2.97 trans. I didn't feel that "bog" but it was only because of how high i was revving and where it was falling back. Since you don't rev as high, I know it's different.

Yes, I would say the bulk of the gain is being able to leave in 2nd. I don't have a ton of data yet, but even hazing the tires in 2nd, it accelerates faster than starting in 3rd with the 1.43 gear.

There's a way you can run the 3.01 first gear and then have the rest of the 2.66 gearing from 2nd on. Might be able to do it with your current trans. That would likely be the best of both worlds, imo.

logan2ss

I would agree on the 3.01 1st and 2.66 remainder, how is that possible? I was told since the cluster gear is different it won’t work. Also, have any 60-70/60-80 etc comparisons of 3rd/2.97 vs 2nd/2.66 to compare directly? Yeah at the moment I’m limited to 8200 because of the stock ECU, I have a terminator that isn’t installed but may go a bit higher with that in depending how it falls off and doing some tire force calculations to see if it’s even worth going higher.

jayyyw

Idk how it works, but I know Sebastian did it with his vette. He found the mainshaft/cluster out of a different car and installed it in his trans case.

I don't know the exact 60-70 from the 2.97 setup. It was likely about .59-.61. With the 2.66 it was .54 spinning.

02EBC5Z06

iTrader: (1)

I don't think many other mainshafts fit our cases. I believe either the ctsv or the gto are the only ones that share the same main.

Ryans99ls1

iTrader: (16)

If the 2.66 gear set improves your 3-4 shift enough to keep you in the meat of your powerband, you'll absolutely see some gains. I wouldn't worry too much about digs if that isn't your primary goal. plus, it can be overcome with a higher rpm launch and some more clutch slip. Seems like rolls are what do more of anyway. And as long as you have enough traction and rpm, you'll always go faster on the smaller tire.

logan2ss

agreed. My main thing is I’m at a crossroads of which way I want to go with the build, rolls or digs. I launched the car 6500-7000 on the track even with the 3.01 and 25.7 tires. But I’ve lost considerable weight on the car since then so I am thinking it might still be okay.

Last 1

iTrader: (2)

I think if I remember right Sebastian used a cluster out of a SSR transmission.

gnx7

iTrader: (28)

Here is a similar website for gearing/HP etc.
http://gearcal.com/

logan2ss

That is my preferred website on gearing. For some reason it has been buggy for me lately if I am on a desktop. Btw hope you are doing well, I purchased that black 4500 from you a few months ago.

02EBC5Z06

iTrader: (1)

logan2ss

Update:

Trying my best to get ready to go to the Shift Sector: Airstrip Attack 1/2 mile event in Hondo TX. Should make it, just going to trim the hood and try to get some front double adjustable struts on the car and have it aligned in time. Hoping to be 160+ mph in the 1/2. We will see how it goes. Have never done any runs with the hood on the car since the 416 so hopefully that picks up some mph as well.

logan2ss

Forgot to post an update after the event.

Just to be clear it was Shift Sector's Airstrip Attack 1/2 mile race in Hondo TX. Was not the best day for me but still enjoyed the experience. Ended up 5th out of 21 entries in the Naturally Aspirated class. What is promising is that was done with almost nothing going right. Incomplete tune (having major lean spikes on tip-in areas such as fast wide open throttle including every gear shift), 2000-2500 DA, 20mph headwinds with 30mph gusts, spinning through 3rd gear, nonideal tire size (wanted to keep driveshaft speed down so I went taller), which put me way out of the powerband. Even so much as losing both of my header extensions causing the car to act up at low speed take-offs, which I did not know I lost them at the time. Not sure if no one saw them come off or what exactly. That was the biggest factor of me letting out every pass afterward, because I could tell something was off. On top of all of that when I would try to log to get any data for the tuner, it kept disconnecting almost instantly so that there was no data to improve upon. Runway was so dusty at takeoff it looked like cars were doing orange burnouts, it was a brutal conditions for everyone at the event not just myself. With that being said I only made one full pass which was my shakedown pass. Ended up running 157.xx off of that one pass, and 158.xx on the dragy. I cannot complain for the 4 vehicles that came in above me were low drag coef cars, or cars with a ton of power, mostly both. Directly above me was a Gen 5 Viper making 700whp, then a 680whp C6Z, second place was an 800whp 537ci BBC 37 Ford Truck on a Nascar featherlite chassis, and 1st was a buddy in his 760whp lightweight C6Z. Overall it was the first time out at a real event with the car since the new motor so I learned a lot of what I need to focus on for further events which is a success. I plan to go to the October event in Abilene and see if I can break that 160 mark. Definitely tougher than I expected but even the event hosts admitted the racers were thrown some of the worse conditions of all of the event locations. One guy I was speaking with said he was down 10+mph compared to the one he attended the month prior.

All I know is the parts list is growing but I am excited to sort everything out and try it again.

jayyyw

Was great to finally meet you. You'll get the issues sorted and pick up a good amount of MPH when you do. Hopefully we can both reach our goals in October.

logan2ss

yes sir back at you. Regardless it was a great experience and was awesome watching you dominate! I think I have quite a bit left in it and we both know what yours can do based on that weekend. Super excited for what’s in store for yours just as much as mine