IROCThe5.7L

Hey guys, I'm having the same exact problem with my 427, as I did my H/C/I L98. After some searching, this seems to be an issue with the HSR? Anything below 2200 rpm isn't smooth. Even if I give it 5% throttle off a light. Once the engine hits 2000-2200rpm it's nice and smooth. If I jab the throttle off a light anything over 30% throttle, it's fine. Although every once in a great while it will catch that problem area under 2200rpm and completely fall on it's face.

So after searching, all I keep reading is AE. I'm using $32b. So I increased the values in these two tables and it didn't seem to help much at all.

(Length of pump shot from what I understand)

(Size of pump shot) <=Should the whole table have 2's in it?


Any suggestions? Should I just keep increasing these tables? Any other tables to look at? I removed a ton of timing in that area also, and it did not help. Thanks guys.

Here's info on the new engine if it would at all help:

Dart SHP 427 SBC
AFR 220 Heads (65cc)
Hydraulic roller cam: Duration @ .050" Lift: 242/248. Lift: .576/.600. 112LSA.
HSR Intake
10:5:1 Compression

RBob

iTrader: (1)

I would try $6E instead of $32B. Note that with $32 the injector PW can be a calculation from the MAF airflow, or a look up from a table. If using the table method, try the calculate from air flow method.

Mask $6E doesn't have the table method, only the calculation method.

RBob.

IROCThe5.7L

Thanks for the reply.

Hmm. Well I don't have a ton of time into tuning this new setup. Maybe I should start over and go with $6E. Should I start with the standard 89 bin. Or arap? I hear arap has better maf tables or something of that nature? Also a fan switch flag needs to be turned off in arap?

Edit:

It appears it is doing the calculation method. So I'm not sure switching to $6E is going to help my issue.

RBob

iTrader: (1)

I think that it is still worth trying ARAP, it doesn't take long to set up the BIN and try it.

Now, IIRC:

disable VATs
flip a NO/NC fan flag
change the cranking PW table for better starts:
; CRANK FUEL PW MULT Vs. REF PULSE LT 17 @ $38B


RBob.

JP86SS

iTrader: (1)

Confirm your closed throttle (Idle) timing is the same as your main table at the same RPM/load.
You could be chasing the wrong thing if there is a few degrees difference there.
Not familiar with the $32b so guessing it has two different tables for SA.

IROCThe5.7L

Thanks guys. Looks like I have a project tonight. I do not see anything about closed throttle timing in my $32b mask.

IROCThe5.7L

RBob,

I just finished my rough $6E / ARAP.bin. I did not touch any AE fueling. All I did was the timing table, injector size, fan on/off, TCC lockup, checked the fan N/O flag, disabled VATS, set idle, and adjusted the cranking tables.

The car fires right up. Idles great. And from what I can tell from my 15 minute drive at operating temp, my problem is solved! Thank you very much for the suggestion. The whole car overall driving seems different (in a good way). I can't put my finger on it but it just seems smoother. I've been chasing this problem for years with $32B. Now it's time for some fine tuning and a wideband.

Orr89RocZ

iTrader: (20)

Bet it was a fuel issue. Lean spot or so as hsr is known to have slight imbalance in airflow at low rpm. Arap fueling and ae may have covered it up. Or timing like said above but glad you figured it out.

RBob

iTrader: (1)

That is good news, others have posted the same results which is why I recommended it.

RBob.

IROCThe5.7L

I wish I knew what the problem was with the $32B. I messed with the fueling for a long time with no real results. Any suggestions on a wideband? If I get one with a narrowband output. Can I just tap into the stock wiring harness where the stock narrow band sensor connects?

RBob

iTrader: (1)

I prefer to use an actual NB O2 sensor. They can be placed closer to the engine for better response time. A WB O2 sensor, Bosch at least, needs to be further downstream as they are sensitive to excess heat.

RBob.