TraviZ

iTrader: (2)

heres video of a run, i think this was my last 11.5 run.http://www.youtube.com/watch?v=5nxZyfkOuEs
ignore the title, my friend is a jackass lol.

my best run of the night was 11.2 @119.

my 60's were all over the place, my best 60' of 1.7 was at 23 psi. about an hour later and much cooler air, i dropped them to 20, and got a 1.9 and 2.1

dont know if that hurt or helped, i will probably up the tire pressure back to 23 because I know that worked.

once i got going past the 60' everything else was nice and consistant. I want to work on consisting my launches now. I think I should go with some LCA reloc brackets and some tubular lca's its all stock right now. I do have a adjustable torque arm that has the pinion angle set for -2 I believe.

any additional input would be appreciated!

1320_Guy

iTrader: (3)

Slicks or drag radials? Can't see much from the video but it looks like you aren't heating them up enough, get the tire speed up.

1989GTATransAm

iTrader: (3)

What tires are you running in the rear? I agree on the burnout being weak. Do you have a line lock for the front brakes? I would say you have the potential to get into the 10's with a good launch. Did they say anything about your 11.2 run or do you have a roll bar? At 11.5 I will be in the same boat with my next round of improvements.

Orr89RocZ

iTrader: (20)

How much boost was that and whats the tune look like so far? Timing/air fuel ratio? Trap speeds only seem to indicate mid 400 whp based on warm cali air.

What kinda tires you run? Burnout seems alittle short but can work with a fresh pair of ET streets. My older ET's like a longer burnout since the rubber starts to harden after awhile

OUTATIME GTA

iTrader: (2)

What are you launching at Travis? 2 out of the 3 runs I saw looked like you hooked well, but maybe not as hard as it would be capable of if your suspension was beefed up and you weren't on a stock 10-bolt, haha.

I guess you can get away without a rollbar at our track if you are tricky about it when they tech you. The slip lady wouldn't notice either when you pull around.

He's on drag radials. I don't think it's necessary to heat as much as slicks, but probably depends on the brand and age.

TraviZ

iTrader: (2)

bfg drag radials. brand new. second time out on them. 285/35/18

my front brakes wont hold worth a damn, i dont know if its lack of vacuum or if I have another issue. brand new rotors, calipers, pads, self bleeding screws. new ls1 master cylinder, new 10" brake booster. everything well bled. still feels like manual brakes. i cant hold them well enough to get a more decent burnout.
they didnt say anything about my runs, i wasnt wearing my helmet either lol. though I had it with me just in case. I did wear my helmet the last two of my runs. /crosses fingers on no roll cage bichout in the future.

aprox 12psi tune is better then last month. target AFR tables are all around 11.5 under wot. spark starts in around 30 and backs down to 24 as boost comes in.

launching around 2200rpm before the brakes let go. i think i was holding a bit harder on my 1.7 launch.


Orr89RocZ- I have seen a few of your awesome TT threads. if it interests you, i can email you a copy of my engine file for your viewing pleasure if you think you have anything to ad?

Orr89RocZ

iTrader: (20)

Are you on code $59 as well? Or some kind of boosted 8D? If so i could take a look but not sure I"ll find anything more to add. Timing seems high for 12psi but if its holding it, then its all good. I know my car doesnt like alot of timing with air fuel in the 11.5 range.

Is your air fuel verified by wideband or spark plug readings? Just curious if theres any more power in there. You can pick up a good bit if your richer than 11 to 1 and move to 11.5-11.8 to 1.

Do those 18" radials feel good? I was thinking about making a switch to a similar size tire on 18" rims so I dont have to do the whole drag thing anymore but wont do it if it wont hook

TraviZ

iTrader: (2)

im sorry, i run holley hp efi. with verified wideband 02.

at 23psi in the tires i cut a 1.7. and i lowered the psi to 20, but the weather got much cooler, and i didnt seem to hook as well, and got 1.9 and 2.1 respectively

i think ive discovered im around 18% torque converter slip though, so that could definitely be hurting my times.

Orr89RocZ

iTrader: (20)

Does seem to be excessive on slippage. You could look into that. What converter you running? Was it custom built for boosted applications?

Cooler air could have cooled the track off and made traction alittle harder to come by. I think drag radials run better with more pressure. I havent ran my 99 TA much but it has 17" drag radials on it, and leaving them near 30psi like how i normally street drive on them, it seems to hook better. On the burnout i feel them start to hook up and bog the engine down. Feels much better that way rather than if they are down on 20-22psi. I'll have to get out and try again. Perhaps you should keep tweaking based on the higher pressures for now and see what happens.

Adjustable shocks/aftermarket suspension can help hook up too. Could be squating too much on intial hook and then unloading the rear, breaking traction. My car has done this before and adjusting the shocks seemed to help control the rate of weight transfer.

TraviZ

iTrader: (2)

i have brand new kyb's all around.

heres a video just uploaded that best shows my launch.

http://www.youtube.com/watch?v=9ZlmC...eature=related

think the squat could be delt with using lca reloc's?

1989GTATransAm

iTrader: (3)

Just watched the video. You are not really getting a good bite but just kind of taking off. The front of your car is hardly coming up. Here is a picture of my car at the recent meet in Fontana on the Memorial Day weekend. Look at the side walls and how the front of the car is coming up transfering the weight to the rear. This provided a 1.57 60'. If your car did that you would be in the 10's. After some trial and error I found that 16psi worked best for me. However I am running Hoosier DOT legal radial tires.

You need to find out why the front brakes are not working and being able to properly use your line-lock. When fixed that will give you a proper burnout of the tires and hopefully a better launch with the tires biting good.

RK82

LS1 master with stock thirdgen brakes?

1bad406

iTrader: (1)

Get some 15" wheels and slicks. The 18's have no sidewall.

UnderCover89TBI

iTrader: (25)

Wow I thought you had the rear suspension components done already. I know LCAs relocation brackets helped me gain traction as well as aftermarket lca's. your front end is not coming up that much. Your going to benefit well from suspension mods and suspension tuning. adjustable lca's, torque arm etc...going to have to upgrade the brakes to hold the car so you can heat the tires up. I know you dont wanan switch to tires with more sidewall so I wont say anything about that. Still very impressive. And the potential is astounding!

Street Lethal

iTrader: (16)

Bingo, not to mention we have no idea how much stall he is running in the converter, and even with the decent 1.7 sixty foot it sounded like he was babying it out of the hole....

VincentZ28

iTrader: (2)

You should be leaving at 1000rpms. Let the converter flash to get a better launch. You're not flashing the converter.

1bad406

iTrader: (1)

I like the look of 18's too, but for the street. Just get a cheap set of 8" wheels and some 26 or 28" 10.5 slicks for the track and you will really see what the suspension is doing.

TraviZ

iTrader: (2)

i have a strict rule of running at the track like i do on the street. that includes tire and choice of fuel.

so help me work with what I have.

rk82 - yes stock thirdgen brakes with ls1 master. why?

streetlethal - 3500stall.

vincentz28 - next time out, ill try doing a idle launch?

Street Lethal

iTrader: (16)

Remember that every tenth of a drop in your sixty foot will usually yield two tenths of a drop in your ET. Getting your sixty foot down to 1.5 will net you your ten second ET, but its going to be rough with those tires. You can hear your launch in your first video, as although she pulls hard off the line, your babying it out of the hole. Bring your RPM's up while you stage and launch harder from the dig, just pray that those tires grab....

RK82

thirdgen master cylinder is a quick take up, and thirdgens uses low drag calipers, so the piston in the ls1 master will have to travel alot further in the bore to provide the same amount of force as the thirdgen master, which results in a low unresponsive brake pedal.

mw66nova

iTrader: (13)

an off idle launch MAY shock the tires too much and cause a worse situation.

lca relocation brackets are a MUST! if you can afford to, i'd put atleast a 17" wheel on it, to get more sidewall....

Street Lethal

iTrader: (16)

My buddy Shawn had an 88 GTA w/LS1 swap, and the GTA was all original, no suspension mods. The only thing different were the tires, they were 16" drag radials. Ran consistent 1.7 sixty foots w/out the nitrous, then later had the car tuned by Cartek as well as activated the window switch. The car then pulled consistent 1.6 sixty foots every single time. If he was running an F1 procharger a 1.5 sixty foot would have been a breeze....

http://www.youtube.com/watch?v=g-5eZO1rubE
http://www.youtube.com/watch?v=U88OCGTUpSw

Orr89RocZ

iTrader: (20)

hate to get off topic but i figured i'd ask now. What about C5 fronts and LS1 rears? Stock thirdgen master seems abit unresponsive on this setup but it may just need proportioning valve work. Thought about a 4th gen master....My 99 TA feels stronger at breaking than my 3rd gen and the 3rd gen has bigger brakes/better pads.



There are vette guys in the 1.4x 60 foot range with 18" radials but the big fat ones If your suspension is doing what it should and the track is sticky, i would think it would grip well enough to support lower 1.5-1.6 60's but its gonna be harder to set up that suspension to work with that tire. A forgiving ET street in a 15-16" size with wrinkle sidewalls will make things much easier to hook and make up for suspension mistakes.

Maria8

get a power grid ignition! I just put one on. It is the sh8t! Replaced my 6Al. With your power and those 18's you are gonna beat your head trying to get it to work. With the power grid, I was able to pull timing out as much as needed to get the car to launch then you ramp it back in as quickly as your tires will hold it. I picked up MPH as well. It may be on the pricey side but well worth it with the boost! Trust me, this is experience talking. Raials work best when you hit them hard, then back off timing some more then ramp it back in. You will spend some time figureing it out the timing curve, but it will help right off the bat. Leave your tune in the car as it is and just start working the grid. Good luck. I went form 9.49 to 9.04 with just new power grid on 295/55/15 MT drag radials.