I am wanting more launch from my GTA. I am using the 165 ecm and arap 6E bin. I have gotten all the upper rpm tables (3000 and up) straightened out for fuel and spark. The problem is launching. The car will not come close to breaking the tires loose.

Not good for racing, I know, however with this setup there is no reason this car shouldn't have a 60' time of around 1.6-1.7 second. I have had it to the track and the 60' time was over 2.05 seconds. I'm running a 2400 stall, 3.73 posi, slp runners and ported plenum, airbox delete, stock TB w/ coolant bypass, 10:1 comp, crane HI-6S ignition system, 30lb injectors, T/F 23 degree heads and a comp cam 220/230 w/ .510" lift. The car used to launch really good with the old 32b bin, and since I have upgraded I have not been able to improve the throttle response or low end torque. The WOT AFR is running 12.5 and the O2mv are 880mv.

Anyone have any thoughts on timing combos and fuel(PE) combos below 2600 rpm to help launch the car better????

Below is the timing table from the ARAP bin I am currently running:
47.11 47.11 47.11 44.30 40.43 39.02 37.97 35.51 34.81 33.05 30.59 29.88
47.11 47.11 47.11 44.30 40.43 39.02 37.97 33.05 33.05 30.59 29.88 28.83
47.11 47.11 47.11 44.30 40.43 39.02 37.97 30.94 26.72 26.37 26.37 26.37
47.11 47.11 47.11 44.30 40.43 39.02 37.97 30.94 26.02 23.55 23.91 23.55
47.11 47.11 47.11 45.70 41.84 41.13 37.97 30.94 26.02 22.85 22.85 22.85
47.11 47.11 47.11 46.41 46.06 43.95 42.89 34.81 29.18 27.07 24.26 22.85
47.11 47.11 47.11 46.41 46.06 45.70 43.24 38.32 34.10 29.88 25.66 23.20
47.11 47.11 47.11 46.41 46.06 45.70 43.24 37.27 36.21 31.29 27.07 25.31
47.11 47.11 47.11 46.41 46.06 44.65 43.24 36.91 37.27 31.29 27.07 25.31
46.06 46.06 46.06 45.00 45.35 43.95 40.08 36.91 37.27 30.59 26.02 23.55
43.95 43.95 43.95 42.89 41.84 41.13 37.97 33.05 33.05 28.83 25.66 23.20
41.13 41.13 41.13 41.13 40.08 39.02 36.91 32.34 32.70 28.83 24.96 22.50
29.88 34.81 40.08 40.08 40.08 35.86 35.86 31.99 29.88 26.02 23.91 21.09
25.31 29.88 40.08 37.62 35.86 31.99 29.18 28.13 26.02 23.91 20.04 20.04
23.91 23.91 29.88 29.88 29.88 29.88 27.07 26.02 23.91 20.04 20.04 20.04
22.15 20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.04
20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.04 20.04

thanks

 

lol, you should want more low end TORQUE, and more top end HORSEPOWER. torque is what gets you moving... hp is what keeps you moving.

btw... i dont know how to burn my own proms, but (correct me if im wrong), i think 47.11 is too much timing to be running, especially with tpi. that might be your problem.

 

sparks, just for fun you might think about moving the dist timing
back a few degrees. if you notice improved performance anywhere, that would be a clue that something is wrong.

 

I think timing is your problem. 47.11 is way too much timing to be running in most small blocks, nevermind TPI'ed small blocks. I have done research that suggest's a Minirammed motor likes total timing to around 38 degrees, far less than what you seem to be running. Break out the timing light and see what happens.

 

I am not sure how to read your timing table on the 6E bin I am used to the $32B bin but I will give you my opinion on WOT timing and let you play with the timing curve.

At WOT you want around 20 degrees of total timing until 2000 RPM and then you want to increase it to full timing advance by 3000 RPM. Once you are at 3000 you should be at full advance. This is just rough guess you will need to fine tune your combination but this should be a starting point. With the Trick flow 23 degree heads your total WOT timing should be around 32 degrees.

I am wondering if your cam is too big for the stall speed you have killing your low end torque. I am running the 219/219 superram cam and when I used it with the auto trans I needed a 2700/2800 stall to get 60 ft times in the 1.6's. I originally had a 2300 RPM stall and it would 60 ft in the 1.8's and stay kind of slugish until 2700 RPM. The cam you picked has more duration then my 219 cam and it may be too much for your combination of parts.

 

Thanks for the input. The cam is only 220* intake at .050. I have run that cam in a carbed 350 and was able to smoke'em at will. The timing table that I'm running has been reduced somewhat from the stock ARAP bin. That 47* is at part throttle and cruise and not WOT. The car accel's great at part throttle and you want as much timing as possible at cruise with as little throttle opening as possible.

I switched over from the 32b bin a few weeks ago and I'm still having trouble getting it tuned. ONce you open it up and it hits about 3000rpm it really gets going pretty good. I'm not sure what in the lower end is different between the 32b and the 6E, but the initial timing has not changed. Someone wrote a while back that the 6E ARAP bin figures timing differently than the 32 bin. A good explanation on what exactly the difference is would help a lot here I think.

Thanks.