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I was looking at your slip thinking either you were running out of gear OR you were upshifting way past the 1/8, killing your top end. You did great to launch with front sway still attached.
Considered a lithium battery? You'd drop 30 lbs off the nose AND you wouldn't have to add all that copper wire.
Yea I'm not sure why so many 4l60e others run 3.73's without this issue, but I did realize something...When I had the trans built the builder upgraded to 5 pinion planetary set front and rear. I'm wondering if that has changed my gear ratio in some way and that's why I'm running out of gear. I'm hoping upping to the 28" tall tire makes some difference and takes some gear away and allows me to pull harder through the finish line.
I did consider lithium battery before...not that things can't be sold, but my optima red top is like 2 months old and I already had the components for the battery relocation kit. Might as well stick with that route now.
I run 3.73s with my 4l60e. With a 26 tire, I was crossing at 6200 with 114mph traps. I went to a 28 tire when I started spraying. Now at 6200 I'm 122 through the traps.
I run 3.73s with my 4l60e. With a 26 tire, I was crossing at 6200 with 114mph traps. I went to a 28 tire when I started spraying. Now at 6200 I'm 122 through the traps.
You and I aren't too far off then I suppose..these 295/55's measure out to about 27.5 inches, and I trap around right about 123 on 150 shot.
Typically they'll make peak power around 6300 unless your build is really exotic. I'd bet 6700 is pretty safe. Main thing is making sure you don't float valves and you could rev to 7200.
Psi 1511 springs
Titanium retainers and keepers
11/32 pushrods from manton
Typically they'll make peak power around 6300 unless your build is really exotic. I'd bet 6700 is pretty safe. Main thing is making sure you don't float valves and you could rev to 7200.
Psi 1511 springs
Titanium retainers and keepers
11/32 pushrods from manton
Probably $600 all in for a great rev kit
Originally Posted by qweedqwag
Congrats homes.
Originally Posted by SLP IROC-Z
Spin it higher. Hell my stock ls6 with chromoly push rods and stock retainers spins to 7500 no problem.
Thanks for the advice and the congratulations guys...I like this idea, as long as the valvetrain is set up for it, why not spin it. I agree. This is easy for me to change over this winter.
Congrats on the 10 sec. time slip. You may know this already but AFR, timing, and the right plugs are very important to running low let's and better mph. The S60 as I understand eat's HP so you lost some HP from when you ran the car on the dyno.
I would say it would be fine to spin your setup to 6,500 with no issues.
Congrats on the 10 sec. time slip. You may know this already but AFR, timing, and the right plugs are very important to running low let's and better mph. The S60 as I understand eat's HP so you lost some HP from when you ran the car on the dyno.
I would say it would be fine to spin your setup to 6,500 with no issues.
N2
Thank you, my AFR runs at about 11.5-11.7 at WOT on spray and about 12.4-12.8 on motor. Running br7 plugs currently. All eight cylinders are pretty chocolate colored and I don't see any signs of detonation on the strap. However a friend just told me to make a pass and shut it down as quickly as physically possible and then pull a plug and cut the strap and half to get a proper read. So I actually did that last night and set the trailer up right near and ending point and got the car on the trailer and shut down just about 2 mins after a run. Basically best I could do. It's been sitting on trailer all day today hadn't had chance to pull plug yet. Timing was set by twisted synergy when tuning was done and I don't have the capability to read or change it since I don't own hp tuners. But I trust that they optimized its timing. They made almost 30 pulls on dyno and several hours of street tuning along with data logging and then adjusting for 5 separate track passes. I am going to ask them to raise my rev limiter to 6500 now though. I think it is set at 6300 and the car currently shifts consistently between 6100-6200 from what I've seen.
I got a set of Hoosier 28x10.50 slicks last night. Made a pass as described in my last post and the extra tire helped Quite a bit. They're only about half inch taller than my drag radials but I crossed line at exactly 6200 in 3rd gear on 150 shot. Hooked like hell. Blew my rear view mirror off the windshield mount. I'm thoroughly pleased. I may just have to try like hell to get back to the track once more this year.
You're shifting too soon and not being as efficient as you could be. I have sbe, stock heads with ls6 cam, trickflow pushrods, and trickflow beehives. Made 342whp and peaked at 6,250. I shift at 6,500 with a stock rebuild with transgo kit trans and have been on the limiter at 6,900 without issue (I didn't know it was 6,900 lol). I'm sure your setup peaks higher than mine and you should raise your shift rpm as such to raise your average power going down the track.
Finding mine likes a lower shift point...I tried 7000 and 7500 and went slower.
I find when I rough it in on pen and paper, it's pretty close. I just use the TQ curve and multiply out rwtq with gearing and figure out what RPM I don't lose rear wheel torque -- not to be confused with engine tq measured at the rear wheels:
If I shift at 7k, my engine tq is 380. On the upshift I land on 5k, my engine tq is 430. BUT first gear is 2.66, second is 1.78. And rear is 4.30. That's 4346 tq at tires in first. Drops to 3291 in second. Lost 1000 lbs tq on the upshift!!
Now, shift at 7400. Engine tq is 320, lands at 5100, still basically 430 engine tq. Now I'm only dropping from 3660 to 3290, AND for those extra couple mph, I made better power and acceleration
If 7400 was say 240, cause it fell like a stone, then I'd be at 2745 and would have done better to shift earlier.
Thank you, my AFR runs at about 11.5-11.7 at WOT on spray and about 12.4-12.8 on motor. Running br7 plugs currently. All eight cylinders are pretty chocolate colored and I don't see any signs of detonation on the strap. However a friend just told me to make a pass and shut it down as quickly as physically possible and then pull a plug and cut the strap and half to get a proper read. So I actually did that last night and set the trailer up right near and ending point and got the car on the trailer and shut down just about 2 mins after a run.Timing was set by twisted synergy and I don't have the capability to read or change it since I don't own hp tuners. But I trust that they optimized its timing. I am going to ask them to raise my rev limiter to 6500 now though. I think it is set at 6300 and the car currently shifts consistently between 6100-6200 from what I've seen.
Well you have some info but not all. You are changing the timing with the LNC box as I believe I read in your post. Suggest having them set the limiter to 6,800 and shift points 1to 2 at 6,400 and 2 to 3 at 6,600. You have to put at least 2 new plugs in and start car make pass and when you cross finish line shut off car. Coast off track pull both plugs throw two other plugs in and drive back to pit. Pick 5 and 6 first then try 7 and 8 on the next pass. You need 12.9 to 13.1 NA. Looks like they put a very safe NA tune in the car. So you are leaving some ET and MPH on the table.
What type of fuel are you running and what are the plugs gapped at? Suggest staying away from anything higher then 100 shot until you get your tune better. You should be adjusting AFR by changing fuel jets. Looked like you deep staged on the 10.80 pass that increases ET and since you let out that drops MPH. My guess is that may have saved your engine. I would say with the AFR down in the 10s it was not to happy. Good you pulled more timing.
Your NA runs are a combination of weight and the converter slowing 60 foot times. Could it be faster yes but it is doing pretty good.
The 100% stock 91K 1998 346 engine in my Formula with headers, Y pipe and tail pipe, air lid with LS1 intake at 3,670 lbs. ran between 11.94 best to 12. 10s all day long. It produced 330 hp and 350 tq before I installed th400, converter and heavy 9 inch rear with 3.70 gears. My guess is that reduced the hp numbers somewhat but it sure did run good after those 3 mods.
Hope this helps. Good luck and be safe.
N2
Last edited by N2RACINGLS1's; 09-25-2017 at 08:29 PM.
09-22-2017, 10:49 AM
