MSefi.com read only forum (Jan.15,2018)

I have a good tune almost everywhere else but am having a terrible time getting rid of the stumble when i blip the throttle from idle or from about 1800 cruise. It falls flat on its face. I have changed and rebuilt my msq so many times trying to get another problem fixed that I have no idea what the settings might be to start with for a v8 or if mine are even close. any suggestions?
Also in my log the values were listed as map dot max 1118 min -1563, tpsdot max 952 min -1045

I am no expert but here is what I think.

Your TPS settings are close to an on/off switch. Look at the slope of that graph compared to the TPSdot changes you are getting in actual driving. I would look at the range of TPSdot you are seeing under a range of driving conditions and set your threshold just above the TPSdot you see in minor movements of the gas pedal and have your scale go from around that min up to the higher range you are seeing (this will flatten out that TPS slope). Your current value of 40 may be a good spot to start with. I would then flatten out that enrichment graph, start with something closer to a 45% angle out starting at your threshold value (you currently have two points under the threshold) up to the higher end of the TPSdot ranges you are seeing.

The shape of the MAPdot looks okay to me, but like with TPS make sure your threshold is not too high (or low) by looking at the rates of change you get in various driving conditions. Then set you beginning and end points closer to your range you are seeing (currently you have two points under the threshold, so to start tuning I would shift your slope to the right).

Try adjusting your blend of TPS vs MAP for AE. Some find they do better with all TPS and no MAP or the opposite, or a mix.

And don't fall into the trap of seeing a lean spike when it falls flat and thinking you need to keep adding more fuel. A noob friend of mine (cough cough, me) did this and the lean spike was from flooding the engine.

Hope this helps.

Brian

OK where I'm confused is here "Also in my log the values were listed as map dot max 1118 min -1563, tpsdot max 952 min -1045"
Thats what happens when I blip to full throttle for a split second. Should I be looking at cruise only throttle like mapdot 45-300?
So basically the 2 problems I have are cruising lean out stumble, and tipin full throttle bog, if those terms make any sense.
Still confused.
Mike

I would focus on the values you see during "normal" driving.

Thanks for the help. I did get it working alot better by looking up the default values from an old msq then modding to match my injectors.
heres what I have now.

i see the last value in tpsdot is 1100.how did you make it? in my tunerstudio the biggest number i can have is 1000%/sec..

Mike did you get it working correctly? Can you post your newest settings? I a having trouble too. Thanks