I was having problems at high rpm for awhile. I had my AFrs looking pretty good but it was breaking up bad past 5000 rpm. I feared that maybe there was some strange mixture distribution problem introduced by the TBI and this setup at high rpm.
My fears were unfounded. I decided to redo my ignition and got an msd 6al, relocated my accel coil so that the coil wire is less than 3 inches long (it was like 2 feet long before ) and changed my old worn out plugs

Instantly the problem was gone, the car is all around WAY smoother and now, it PULLS LIKE HELL to 6000 rpm!

here is a data log from second and third gear
as you can see the afr is pretty close to spot on in second but for some reason leans out in third a little. Im not sure why exactly, i can always add more fuel in but I'd like to know why its doing that.

time/afr/rpm/map

3.670, 14.26, 2932, 92,
43.780, 12.76, 2994, 95,
43.890, 12.11, 3141, 95,
44.000, 12.25, 3222, 95,
44.110, 12.83, 3363, 95,
44.220, 13.31, 3432, 95,
44.330, 13.57, 3529, 92,
44.440, 13.57, 3671, 95,
44.660, 13.46, 3886, 94,
44.770, 13.31, 4010, 94,
44.880, 13.28, 4132, 94,
44.990, 13.13, 4243, 94,
45.100, 13.17, 4360, 93,
45.210, 13.10, 4437, 94,
45.320, 12.87, 4559, 95,
45.430, 12.86, 4687, 94,
45.540, 12.91, 4702, 94,
45.650, 12.84, 4870, 94,
45.760, 12.76, 4950, 94,
45.870, 12.84, 5084, 94,
45.980, 12.95, 5154, 94,
46.090, 12.80, 5281, 94,
46.200, 12.71, 5328, 94,
46.310, 12.79, 5395, 94,
46.420, 12.82, 5524, 92,
46.530, 12.79, 5565, 94,
46.640, 12.64, 5780, 95,
46.750, 12.58, 5780, 93
46.860, 12.78, 5870, 93,
46.970, 12.84, 6012, 94,
47.080, 13.02, 6048, 94,
47.190, 13.15, 6097, 93,
47.300, 12.80, 5758, 21, >
47.410, 12.05, 5444, 6, >gear shift
47.520, 10.89, 5145, 4, >
47.630, 10.28, 4885, 27,
47.740, 11.05, 4207, 94,
47.850, 12.76, 4392, 95,
47.960, 12.49, 4392, 95,
48.070, 12.37, 4457, 94,
48.180, 12.64, 4524, 94,
48.400, 13.10, 4651, 94,
48.510, 13.23, 4651, 94,
48.620, 13.22, 4731, 94,
48.730, 13.31, 4792, 94,
48.840, 13.05, 4838, 94,
48.950, 13.00, 4918, 93,
49.060, 13.10, 4950, 95,
49.170, 13.02, 4991, 95,
49.390, 13.08, 5084, 94,
49.500, 13.14, 5128, 94,
49.610, 13.19, 5163, 93,
49.720, 13.19, 5217, 94,
49.830, 13.21, 5319, 93,
49.940, 13.24, 5328, 93,
50.050, 13.16, 5291, 96,
50.160, 13.11, 5366, 95,
50.270, 13.02, 5464, 92,
50.380, 13.04, 5504, 94,
50.490, 13.06, 5545, 95,
50.600, 13.10, 5565, 93,
50.820, 13.31, 5628, 95,
50.930, 13.31, 5671, 94,
51.040, 13.35, 5681, 94,
51.150, 13.21, 5660, 95,
51.260, 13.40, 5825, 96,
51.370, 13.46, 5813, 95,
51.590, 13.50, 5905, 93,
51.700, 13.51, 5882, 94,
51.810, 13.43, 5964, 93,
51.920, 13.40, 6000, 94,
52.030, 13.21, 5976, 94,
52.140, 13.37, 6000, 94,
52.250, 13.42, 6048, 94,
52.360, 13.20, 6109, 94,

the map shoudl be reading 100 the scaling is just a little off, i set it awhile back

I gotta tell you, SOTP its rediculously quick in first gear. I punched it going up a slight uphill and broke loose mid 4000 range and its like 95 degrees out and i have D/Rs!

It hasnt felt this quick in a long time if not ever... we'll see what my *** dyno is right if i can make it to the track next weekend.

Without a doubt its a 13 second ride though, just far how into the thirteens is the Q

 

also note that my map does not really change at all even at very high rpm. In my mind that is the nail in the coffin on the issue of whether or not these are flowed at 1.5" or 3"

 

What type of ecm do you use Pablo?

 

7747

 

Thanks..
I ask because I also use a 7747 and discovered a problem a few weeks ago after installing my wideband. It was leaning out after the gearshifts, but yours appears to do the opposite.. I made a post about it but didn't really get anywhere with it..
https://www.thirdgen.org/techbb2/sho...&highlight=afr

Would you mind sending your latest bin to me so i can see where it may be different?? I am trying to figure what may affect the AFR immediately after a shift.
Ben.

 

sure thing, i must warn you the chip is still very rough though. I think im going async at high vacuum and thus have no control at 20kpa anymore.


I think what is different is that I have a stick and I let off on the shifts, when I jump back on the throttle the pump shot routine comes into play and gives me the fuel that you arent getting. So Im not sure looking at my chip will help you much but check your mail

 

Thanks..
Ahhh didn't realise you had a manual trans..
That might make the difference..
Ben.