What am I doing wrong?

[rojizostang]

Shifting at 6500 normal shifts.

if you're not powershifting, you're probably giving away a lot of time right there.

 

[13726548]

I believe these engines run out of steam at about 5800rpm. So 6k+ shifts sound a bit high?

 

[GT.350-R]

I believe these engines run out of steam at about 5800rpm. So 6k+ shifts sound a bit high?

I'm launching at 6500 and shifting at 6800. Mine isn't running out of steam. I think with some seat he can see 12.xxs.

 

[rojizostang]

I'm launching at 6500 and shifting at 6800. Mine isn't running out of steam. I think with some seat he can see 12.xxs.

i no lift shift at 6500

 

[GT.350-R]

i no lift shift at 6500

HAHA , yep ,thats the only way to go. Hold it to the floor and jerk.

 

[mwinter501]

Again, sorry for the ignorance, but what do you mean by me seeing some seat? Thanks everyone for the help, need to brush up on my lingo.

 

[GT.350-R]

Sorry I type to fast. I meant to say (seat time) . These car are different from our old fox cars. It just takes practice

 

[mwinter501]

Do yawl think I should be launching at higher RPMs or do I need taller, stickier tires before i try that? It really seems like I could reach farther into the rpm range when launching, traction has never been a problem since I got the nittos, but I know there are better tires.

 

[GT.350-R]

I'm not sure how tall your tire is now but with 4:10s at our power level I wouldn't go any taller than a 26 inch tall tire.

Mabey someone else could chime in on this but when I ran in florida a month ago my car would only trap @107 and when I got home in Indiana my trap speed went back up to 112mph.

I'd say we're at the same power level just different air,temp and altitude

 

[mwinter501]

Thanks for all of the help. I'll start power shifting and hitting more test and tune nights. Hopefully I'll get the times down a little. Thinking back, i was going against challenger SRTs that were dialed in at 13.00. So a small fraction may be the local climate.

 

[Sharad]

I have LCAs on the way and will soon be getting relocation brackets to weld in.

Which ones did you go with?

 

[psfracer]

Here are my thoughts after reading through the thread.

1) even though the altitude is only 650, which isn't bad, a high humidity can really increase the DA, which will effect ET/MPH.

2) If you look at the ET spreadsheet here: http://s197forum.com/forum/showthread.php?t=5218 You will notice that most people trapping around 104-105 mph are turning very low 13.1Xs or so., but also notice their 60' times are in the 1.9X range. You have a not to bad 1.8X 60' time, so it could be you just need to be more aggressive shifting. But at your power level, I think a 1.8X 60' time isn't that bad--its actually pretty good.

3) One way to see if the car is laying down is to compare your 1/8th mph to your 1/4 mph. You are at 22 mph---most cars in your ET range, N/A average about the same 22-23 mph---so the good news is it doesn't look like the car is pulling timing or getting heat soaked or anything like that.

 

[stang72]

I am running similar mods to you.Also launch at 4500.Fully stock suspension except for the bmr LCA's.Removed front sway bar and running on 275-40-17 m/t dr.Good for 1.73 60ft.

 

[rojizostang]

i agree...with psfracer...if you have 4.10's, stick with a 26" tall tire. i have 4.56's and still run a 26" tall tire. if you've got a 5m (manual tranny), imho bias ply et streets are a better choice than drag radials. the sweet spot for launching (at least in my experience) is a lot wider. with a harder launch, bias ply streets, front sway bar removal, i think you could see 12.8's or 12.7's. but you gotta powershift!

 

[mwinter501]

I went with UMI single adjustable LCAs.

PSFRACER: that's all good news, I'll focus on shifting more aggressively and see how much I can pick up. Although my times seem slow, they do still fall in line with other cars at the local track. I just started getting concerned seeing consistent postings of similarly modded cars almost going a full second faster. Sometimes I forget to take humidity into consideration since it's always so humid.

 

[mwinter501]

Rojizostang: seems the general consensus is for me to start powershifting, so that is first on my list. I found that I need to go slow with the way I change things up with drag racing. If I go up to the line with more than one or two things to change, I usually don't end up doing any of them once the lights start counting down.

Hopefully the shifting and LCAs make a notable difference. If not inwill certainly start looking at bias ply tires based on your recommendation.

Thanks again everyone for the help. I greatly appreciate it.

 

[fdjizm]

I believe these engines run out of steam at about 5800rpm. So 6k+ shifts sound a bit high?

No that's a myth, you shift higher to be in the better part of the powerband for the next gear.
My engine doesn't stop making HP till 6200 then it slowly goes down maybe 5-8hp till I shift at 6500.
Just because you're done making HP doesn't mean it's time to shift.