unknown_host

iTrader: (1)

Ok got to run the car again this Friday, really enjoying racing so much although my bracket racing wasn't great this time around .

Anyways, since last time I removed my 3" Magnaflow muffler and stock over the axle pipe, and had a 3" Dynomax Bullet muffler installed and dumped right at the axle.

It sounds awesome, the Magnaflow completely covered up the sound of the camshaft before, now you can tell it has a decent cam and compression .

New PB tonight, the car went 13.41 @ 103.88 on a 2.036 and 13.40 @ 103.81, but ran 103.5+ all night. Previously, it was running 13.47 and slower at mid 101's and once at 102.8

So basically picked up anywhere from 1-2 mph, if averaged all of my runs probably 1.5 mph. I am very happy with the mph.

I still don't get why the car won't 60', I guess the only thing left is the converter. I upped the float levels, tried bumping the timing, the inital hit is hard and then it just rolls out lazy and then picks way up. I am also thinking about trying to lock my timing up to see if that helps the 60'.

brandoz28

iTrader: (1)

A converter will help a lot, especially if you have a cam in it.

congrats on the new pb !

355sleeper

iTrader: (4)

needs a converter for sure, u will easily be 12s!

instead of locking timing, why dont you change out the springs/weights so the advance comes in much sooner.

83 Crossfire TA

iTrader: (2)

Low 10x mph = low 13s. I have honestly run as fast and a stock L 98. But I also ran a 1.8x 60' on street radials. I would bet that I could have run a high 12 with headers and that exhaust in that car. To me that suggests that you have a tuning or driving problem or u would be seeing more mph in the 1/4

unknown_host

iTrader: (1)

I am also not doubting it may have tuning issues trying to sort those out now . I am thinking of locking my timing out at 36* to see if it helps it 60' better.

My L98 with 90k miles went 14.93 @ 93 mph on a 2.275 60', at the time it only had K&N filters and some basic weight reduction.

Shorty headers, Y pipe, magnaflow muffler, Summit 2800 converter and drag radials got it down to 14.19 @ 96 mph on a 2.04 60'

Vortec heads, Lunati 218/228@.050 112 lsa .535/.540 cam, Summit Stage 1 intake, 650 double pumper, 3.70 gears went 13.47 @ 102.8

Switching from the Magnaflow to a bullet went 13.41 @ 103.88


Just trying to figure out what to do next, I am wondering how much the car would pick up with a Perform RPM Air Gap, then I will definitely need a cowl hood though.

83 Crossfire TA

iTrader: (2)

sounds like you are consistently 4 to 5 1/10s slower to the 60' than I would expect from the combination. That would = .6 - .8 by the end of the track. Sounds like you're running a stock converter. What gears/tires? Are you bogging or spinning off the line?

mw66nova

iTrader: (13)

it may need some accelerator pump tuning or maybe even jet tuning. have you done any carb tweaking other than float levels? do you have a link to the carb you have specifically?

a performer RPM would pick it up another mph or so i bet.

unknown_host

iTrader: (1)

3.70 gears, used 2800 Summit brand converter, Mickey Thompson ET Drag radials. I can just about flat foot the car out of the hole. The weight transfers nice, it hits hard initially, then rolls out a few feet then picks up and goes.

When we first got it running, we used a vacuum gauge to adjust the 4 corner idle, but that was some time ago. I have dropped the primary jets down 2 sizes as it seemed fat all around. Other than that, I haven't changed anything else.

http://www.summitracing.com/parts/qft-hr-650

This is the carb I am running. Maybe I am describing this wrong, but it seems like a "flat" spot, initial hit and hookup is hard, then flat, then hard.

355sleeper

iTrader: (4)

sounds like you need to bump up squirter size!

83 Crossfire TA

iTrader: (2)

I'm going to third that, sounds to me like you need more accelerator pump. I doubt that locking out the timing will help any, I'm not sure what you're using but you should be all in by the time your converter stalls. It might remove a variable from tuning making it a little easier but I doubt that it will work better. You'd probably also gain a little from a higher stall/better converter, but unless there's something really wrong with your existing one it won't be enough to make it worth the work or the $$$

unknown_host

iTrader: (1)

Gonna bump the squirter size up 3 sizes and see what happens thanks for the advice guys.

unknown_host

iTrader: (1)

Thanks going to give that a shot!