that's the plan anyway.

since last time out (about a month ago) i've fixed my fueling issues and changed the rear gears from 4.56's to 4.11's. remember the car was running out of fuel and hiting the rev-limiter on 1-2 and 2-3 shift points and hitting the limiter about 100ft before the 1320 and still managed a 12.15 @ 110mph. i'm also going to raise the limiter, though with the new 4.11's i may not need it to be much higher, but it is only set at 6200. it does appear to pull alot harder up top with the 4.11's based on a couple of street runs.

here's to jumping into the 11's with both feet!

 

what fixed the fueling issue?

 

the pressure still drops a little, but AFR stays steady, so i'm going to let it ride. it was mostly venting, but i may still end up replacing the regulator as i'm just about maxed out on this one.

 

good luck to you nova! hope you get that thing running how it should. how are you tuning it?

 

i'm using HP tuners, but i won't have the equipment this friday. i'm going to just get more seat time and work on reaction time and stuff. the changes alone seem to have really waken the car up so i don't think it'll be a waste of time. i'm going to the LSx shootout in october and i wanna have plenty of seat time to be competetive, as i'll be running an index class there.

just the gear change alone made it so the car is no longer hitting the limiter between shifts now.

 

cool, i would love to make it there but its so far away and nothing i own has an ls motor...besides the truck lol

 

yeah...iowa is a little ways away from georgia...but thanks for the sentiment, lol!

 

yeah, when i get my berli done it might have a 396 ls motor, HEAVY breathing on the nitrous. we'll see tho its only money

 

I wish I didnt have to work this weekend. I would love to come out and check you the car. Hell I might have even seen about gerttting mine back out...LOL Good luck

 

Hey Matt, sorry I have to work tonight. Anyway good luck I think you'll see 11's!

Craig

 

i just got back in, wow what a night. a buddy of mine has a procharged '02 forumla, six speed car. 5500rpm clutch dump at about 10 o'clock tonight and he twisted the driveshaft up like a twisty tie, so after i got him loaded up, i made one more pass and called it a night. i brought his stuff back to the house, then went back to the track and got mine and brought it back. seems like i tow other peoples stuff home more than i do my own, lol!

first pass off the trailer went 12.12 at 111.1mph, i knew it had an 11 second time slip in it when i saw that! the car was still barely tapping the rev-limiter on 1-2 and 2-3 shifts, and it did all night so once i raise the limiter and get the shift points dialed in i think it'll be close to a tenth faster. we did have a threat of rain this evening and it shut us down for about an hour as we waited for it to blow through. mostly just some crazy lightning but we did get a few sprinkles.

a little after 9 o'clock we got to start racing agian. it was cooler cause the rain and just gone through, but the humidity hadn't picked back up yet. i'd imagine the air got better for my second pass, but went away for the rest of the night because it was nasty sticky after that. the better air and the cool down netted me my best of the night (and personal best as well!) at 12.02 @ 111.6 on a 1.566 60' time. 1/8 mile numbers were right at 7.58 @ nearly 88mph. i went through the traps right at 6000rpm so the 4.11's are perfect i think. the DA at the time of the run was 2210, so it was a tick bit better than last time i went out 4 weeks ago.

i made three more passes after that, 12.10, 12.08, 12.09...no 11's yet but once i get the shiftting issues fixed and start to actually play with the tune, i don't see 11's as a problem.

in October i'm going to run the car in the LSx shootout and i want to run their index class. i don't think i have enough umph to run the 11.50 index like i was planning on it, but the 12.00 class would be perfect. i think if i run 11.8x's all out that the 12.00 deal should be pretty easy.

based on what i'm seeing here, i have torque converter slippage of 12.9% is that acceptable? seems a bit high to me.

that is all.

 

Good to hear.

 

i have a 4th gen 12 bolt with chromoly driveshaft for sale if your buddy is interested....

what kind of converter are you running?

 

Precision Industries VIG3600

he's already got a 12 bolt, but what's the skinny on the driveshaft? after seeing him do that, i'm wondering if i need to do anything. i'm only running a stock thirdgen 1le aluminum shaft.

 

A 3600 stall converter trapping 6,000 Rpm's shouldn't be slipping. I was always leary of those calcualtors. Some cars work well with what they call "slippage". The 60ft looks to be working. What does the last 320 ft feel like? Still making power or slowing down?

 

it's still pulling pretty hard up top...the car gains nearly 24mph in the last 660'.

 

Congrats Matt. You will get your 11's soon enough

 

yup 11s with a cam only thirdgen shouldn't be too hard at all, i'd be looking at your tune a lot more. Bet there's a lot of power missing off your table.

 

oh i'm certain of it. i just don't have a clue as to were to start, lol!

 

well if you can make some pics of your logs and post them here maybe i could be a little help, but remember carb > efi in my book on these things so who knows how good of a help I'll be. But I am putting a 5.3L efi setup into my 88 suburban in a few months. 295hp compared to the factory 210hp will be a nice jump along with better mileage while towing. I can't wait.

 

Matt do you have any of the software? Or is all the software you using Gregs

 

even my 5.3 in my 99 silverado feels waaaaay better than the 230ish horse 350 in my dads 97. i still wouldn't mind putting a cam'd 5.3 into a thirdgen, make for a nice dd something small around 220-224 duration

 

probably pull better with a vortec 5.7L....

 

going from a 5.7 truck with only a car on a trailer i could only go about 60-65 before you could feel the truck starting to work. with my 5.3 in my truck i could run 70 mph without it starting to feel strained, and that time we had the thing loaded down. just my experience. back on subject

 

no this is the old LO5 tbi truck motor, no vortec heads. TBI swirl port heads are on it and with 195k on the motor it's time has come and gone.

 

yea, im saying it would probably be easier and cheaper to find a vortec 350 for it. im sure there would be less worries with the motor mounts and stuff.

6.0L with a 4l80 would be win, though.

 

the vortec 350 makes a good bit more torque than the 5.3 does, so i will say there was some other issues with the 5.7 truck. gearing or something.

my 6.0 2500 doesnt pull all that great until you get it wound up to 70+. 3.73 gears. any slower than that and it will want to downshift on the hills. this is with a car on an open trailer.

 

i love these engines, and plan to swap many many 4.8/5.3/5.7/6.0's in all types of vehicles for racing and cruising applications in all sorts of configurations. however, when it comes to trucks and hauling; DIESEL OR NOTHING. i have a 1991.5 dodge d250 with a cummins 12v/5spd combo and i will never haul with anything not diesel on my own will ever again. this thing has endless torque and can take a serious beating, and last time i pulled the car on a trip it averaged nearly 17mpg.

back on topic.

all the tuning equipment i was using is my buddy greg's. i am planning to get some of my own but it's gonna be a slow process. the laptop i used for posting on the internet is a piece of garbage and i wanna get a dedicated computer, one of those little $250 laptops that are like half the size of a regular laptop. i was not able to do any data logging this past weekend because greg had the equipment with him. i just did everything old school and it worked out OK, but i would have liked to get some data from it. i'm still running stock timing tables as far as i know, so i know i have alot of growth room. i've got a wideband lined up, just gotta secure some funds now.

here's a vid of me whoopin' a fox body. it's a little blury but you get the idea:

http://www.facebook.com/v/118810341946

 

haul the car up here to greenville, sc and drop it off for a couple of days. the tune will be perfect.

www.jrracingtuning.com

 

The thing most people don't remember is that track MPH is a calculation of the time it took you to cross the last 60' of track(from 1260-1320). It is not your actual MPH at the line. Different combinations gain in different sections of the track.

The only truely accurate way to calculate converter slippage is via a data log of the engine rpm and the ds speed.

 

What are you using for a rear tire diameter in your converter slip calc?

Should be using the measured loaded radius x 2 measured from the wheel center point to the ground when the slicks are at running presure. It will be a good bit less than the "sidewall diameter" Usually you loose at least a good 1/2" of loaded radius which is 1" shorter tire diameter. The lower the tire air pressure, the shorter the effective loaded tire diameter.

eg: the rated diameter of my ET streets is 26.1"
The actual measured loaded radius is 12.75" or only 25.5" tall
My off the shelf B&M 3600 converter comes in right at 7% slip.
But appears to have over 10% slip if you use the sidewall/catalog tire diameter in the calc.

 

very interesting info, i was using the sidewall rated diameter of 29"

 

how do you measure the tire loaded diameter while the car is going thru the traps? are you taking into account tire growth? or does growth affect the loaded height at all?

 

These tires don't really grow at speed. 14x 32 slicks yes.

 

how much do those tires grow?

 

haha the first time I tried measuring converter slip it gave me like 30%. 28x10.5's with 4.10s trapping 114.5 @ 6200 rpm. This was until I measured and found my "28's" measured 26.5 with 15 lbs in them and mounted on the car on the ground. To get accurate converter slip you need to either measure ds speed or measure the exact circumference of YOUR tires.

BTW Matt, our cars run IDENTICAL times lol. I do between 1.56-1.58 60s, trap 89-90 in the 1/8th and 11.95-12.10s depending on the air at 114mph. Picks up 24-25 mph on the big end. How much does your car wiegh? Just trying to see where I stack up vs the LS cars. I had the oppurtunity to buy a LS6 out of a CTS-V for dirt cheap but passed it up because I already had so much invested in my motor. Now im wondereng why I didn't take it.....

 

12.02 @ 111.6mph was at 3350lb raceweight at 2210' DA. we'd be a really good race! you got me on the mph though...but i'm still mostly untuned.

 

My 33x10.5's grow over 3". With it strapped down like there was no tomorrow on the dyno rollers it still raised the back of the car well over an 1", plus whatever the suspension compressed.

28x10.5's will still grow. It's not as drastic as a change though, and wheel size and air pressure play a large roll.

 

Checking back to see if the 11.99 happened?

 

not yet, maybe next friday...