25thannivZ28

So, I have a Mini-ram on my 350 and it backfires when I do the following: If I feather the throttle minimally then hammer on it. Like lets say if I were at an intersection waiting to cross traffic, I'm waiting w/my foot off the brake & just moments before I hammer on it, i'm feathering the gas pedal then GO. Like a rev then go. At this time, it backfires & it keeps me from going anywhere. I pulled it in the garage & did the same thing at the throttle linkage, pull it back a bit, then hit it. Backfires. When I GRADUALLY go up in RPMS, its fine. I know my dizzy is a bit rusty, could that be a contributing factor? Thanks in advance in sharing your knowledge.

antman89iroc

I don't own a Miniram but at the price TPIS charges, they ought to help you out.

ibmtech

iTrader: (1)

How much AE are you adding to your prom. I had to add tons to get mine right. Remember that the Mini-ram loves fuel.

25thannivZ28

OH gosh, I have no idea what the AE is. Someone else had programmed it for me, who since I haven't talked to in a while. What would that effect?

Good call on contacting TPIS, it only started happening recently. Maybe something they have heard of though and have a solution for, thanks for that info

sofakingdom

iTrader: (1)

Right: that's not a "MiniRam" problem, as such; that's a tuning problem.

If you're trying to do the mail-order chip thing, you're in for a rough and EXPENSIVE ride. I'd strongly recommend either acquiring the equiptment and burning your own PROMs, or getting an aftermarket ECU that you can program from a laptop.

Probably not anything to do with the dist. Sound like inadequate fuel map. AE (acceleration enrichment) would be a good candidate to look at, like ibmtech suggests. That's the equivalent of a carb's accelerator pump. Gives a small extra shot of fuel to help maintain the proper mixture during the sudden inrush of air when the throttle is blipped, before the rest of the fuel system has time to respond.

anesthes

iTrader: (12)

Miniram loves ae. You need to do your own tuning. Your combo is just too far from stock to even consider mail order.

-- JOe

25thannivZ28

Great, thanks for that info! I'll have to contact that guy who programmed it originally to see if that can be adjusted.

ibmtech

iTrader: (1)

AE is Acceleration Enrichment. That is found in CATS or RT Tuner Pro for anyone who programs their own proms.

25thannivZ28

Problem solved, AE was switched on the chip & no more back-fire! I didn't take it for a ride in this cold salty weather, but in the garage it revs instantaneously. Thanks for everyone's input & suggestions

ibmtech

iTrader: (1)

What do you mean your AE was switched??

25thannivZ28

On the laptop, the person plugged in my prom and brought up one of the several AE fields. He then proceeded to change two of the values at specific percentages of open throttle. Sorry, i am not familiar with that jargon to beable to inform precisely, but the values that were changed are as follows. One was changed from .299 to .375 in one field and from .185 to .250 in another. I guess that made it dump more fuel in the chamber upon a specific Throttle position percentage or something. ?

anesthes

iTrader: (12)

Make sure you road test it. I'm pretty sure one of the qualifyers to AE is the vehicle should be moving. (accelerating even!)

-- Joe

lakeffect2

Hopefully This thread has just helped me discover an answer to one of my issues (my wife says I have many) that may be AE related.

I swapped over from a stock 48mm throttle body (TB) to a 58mm aftermarket TB. and am experiencing some braking up when I'm into the gas pedal but not mashed to the floor for wide open throttle. (WOT) I get some similar back fires, which I'm starting to realize may been lean pops. can't say i know the difference or if they are the same thing. I think of "back fire" as up throught the TB (or carb) and "lean pops" as out the exhaust system.

It just dawned on me (it only took six months!) that the 58mm TB is letting in more a lot more air. I have made some corrections in the main fuel maps based on data logging, but have not touched any AE areas. Is it likely I need to increase the AE numbers to increase more fuel because of the new throttle body? If so is 20% a good start, 10%.. 30%

The sweep surface area of new 58mm TB is about 1.48 times larger than the old 48mm TB. Would I expect to increase AE by 48%?