So your car runs pretty much 106.1-107.1 on all of the runs and then on the bolded one it runs a 109.9? I'm confused here. It should be consistent with an auto. That DA still sucks. Go out in some cooler air (50 degree) and you'll knock .2-.3 off of that. Yes your car could benefit from a bigger tb. I'd get a Summit 58mm one for $250ish. For the gears you'd have to tell us what rpm you are crossing the finish line at. You want to be in 3rd above 6000rpm, more likely 6500rpm or so. That will give you enough cushion to make some improvements to lower your et and still have enough gear to run. If you are crossing the line at say 6grand in 3rd, your car can easily use more gear in back or a smaller diameter tire. Keep in mind that noone expects their cars to run killer numbers right off the bat. It takes time to dial a car in and figure out what it wants. I chased stupid little nagging problems with my car and eventually dropped a full second without so much as touching a valve cover. All the little things add up. I found a semi-stuck brake caliper, crappy front end alignment, tweaked the tune numerous times, etc, etc..

How do you stage the car? For the lowest possible ET, you want to BARELY light the stage bulb. This will give you 8" of rollout before you start the et clocks. Might not sound like a lot but every bit helps. Basically it gives your car a split second of momentum before the timer starts. How much tire pressure do you run in the front? How much gas is in the car? Any crap in the trunk? Pay attention to all of the details and the ET will start to drop. Pretty soon the car will be running mid-12's in the heat, and then in the fall you'll get your low 12. When is the last time you checked your tranny fluid?

 

That time seems very low. You should be closer to 11s with that package

 

My mistake 106.9...stock tach looks to be 6200...I stage like you said..45# air in stock fronts..little ovet 1/4 tank gas..nothing in car but me...tranny was just rebuilt & beefed up been checking fluid every time car is out..

 

What rear tires are you running? I'd like to see an in-car video of one of your runs. I would pay VERY close attention to the 1-2 shift. Does the car hang-up around 6000rpm for a second and then shift or does it shift really fast? Same thing on the 2-3 shift. 4L60E's are notorious for poor shifting. Having it rebuilt by a local tranny shop that doesn't specialize in them doesn't make it any better. Try to get a video of the car doing a launch and then a hard 1-2 shift. Have a friend film it with the camera pointed directly at the tachometer the entire time. Do it on a back road if you can get some traction.

Report back here with the video!

 

Something is up with it, I trap over 100 at over 7,000 DA with baby cam only. If its making even 350 it should be trapping higher than you are.

 

Tranny was rebuilt by a close friend who is an EXCELLENT builder,Tranny is equal to level 3. shifts seem very firm...i'll try to get that film in production tomorrow,but don't think I'll get traction. Tires are MT drag radials 255-50-16s

 

does your car weigh somewhere north of 4500 pounds? that would explain everything

 

Being that heavy your car will be slow for what it is. Either way that tune looks a bit shotty.

 

xs lol

Something doesn't add up to me, which is why I keep asking about the tranny and the shifting. Your car is making 400hp at the wheels. You are running it in an f-bod. Even in 3100DA it should be running good times. Brakes are locked up, front tires are toed out, wheel bearings are smoked, rear end bearings are toast, etc, etc, something isn't right with the chassis/drivetrain that you have the motor bolted in to.

 

Car has never trapped good,bone stock best of 3 runs was 14.6@96.5 with 2.73s and it did not go to 3rd till I was thru the traps.

 

Well, rear was apart when tranny was down everything is ok in there,,you gave me alot to look at. I have 2 good friends who help me so i guess we'll start hunting. In the meantime I can still run. Thanks for your help.

 

start with bigger TB, bigger inj, new plug wires and have the tuner have another go with it. Get some data logs from his tune and post them up so we can see the AFG's, Knock retard, A/F ratio, l/r O2's & BLM's at every RPM and check fuel pressure to see if it is losing presure at high RPM.

The graph has a VERY strange TQ curve and especially for starting around 4000 RPM unless that is where ne hailed it at. It would be nice for him to nail it around 2000 RPM and keep it in 3rd gear for the pull to get a better feel of what the TQ curve really looks like.

Should definitely be closer to 12.1-11.6 (depending on 60 ft) @ 116-117 MPH thru the auto trans/stall with the heads/cam.

 

Just talked with tuner he's going to fax me the data logs and i'll post them up.He said he can get a little more out of tune but no reason to do it yet if I'm going to change TB & injs,has new wires....Thanks Lloyd

 

Little update,,Talked with tuner yesterday said ther is some more in the tune.A friend's brother has a summit 58mm TB that he took of a 96 before he sold the car,said its fine & I cam put it on to try. Going to to put TB on,check a couple things then get it back to tuner. Tuner w/dyno is only 25 miles away, no charge for updates & he"s willing to work at it so I think we'll get it worked out. And converter was locked for dyno run & A/F is 12.15

Dave

 

sounds good.

be sure and get the data logs too.

Lloyd

 

I'll get them this trip, then get them to you. Lloyd,do you have a fax ?

dave

 

I thought your numbers were with the stall unlocked, ok that makes sense now lol. Don't forget to see where the shiftpoints are set to as well. Good luck

 

A/F is 12.15?

That is horrible for an N/A car. Get it up near 13.0, 12.8 is perfect with a little cushion. I would slap your tuner. Make sure you always run good gas, NEVER skimp out!

 

nah, no fax but post them here or in tuning section with a link in this post.

e mail them to me if you want but I have not been able to open those attachments since my last computer crash a few months back.

Lloyd

 

Well 58mm TB is on, got a list for the tuner & a bunch of questions..Thanks to you guys and Lloyd. I'm going to call him in the morning and see when he can get at it. Thanks guys I'll keep you posted.

dave