Unichip Tuner

[Ryder276]

Also had a custom cat-back with two mufflers dumping at the rear axle
done by the tuner before the runs. (to replace my single muffler back system)

Thanks to Andrew Fernandez at San Dimas auto racing for making my truck
perform and sound great!

[sfz989]

Thanks for sharing those graphs ryder! So it looks like you gained about 10 peak whp over stock with the custom tune. Any idea why the hp dropped around 5k and then picked back up? And if you don't mind answering, how much did the custom tune run ya? Thanks!

[Ryder276]

Originally Posted by sfz989

Thanks for sharing those graphs ryder! So it looks like you gained about 10 peak whp over stock with the custom tune. Any idea why the hp dropped around 5k and then picked back up? And if you don't mind answering, how much did the custom tune run ya? Thanks!

$300
-- i dont know about that drop, ill ask him tommorow.

[tonylop33]

Was the stock Unichip dyno run done after the new exhaust? If so that might explain why the "stock" Unichip tune was less than idea. It might not be correcting for the exhaust difference.

[that1seven]

ok someone explain to me why i lost hp?

[Ryder276]

Originally Posted by tonylop33

Was the stock Unichip dyno run done after the new exhaust? If so that might explain why the "stock" Unichip tune was less than idea. It might not be correcting for the exhaust difference.

ALL runs were done after the new exhaust , - the tuner pointed out how restictive my muffler back system was in several areas.

I ordered the unichip with cai/headers/cat-back.

[123456999]

Originally Posted by that1seven

ok someone explain to me why i lost hp?

The most obvious reason is because your AFR was at 15.1:1 with the Unichip and around 12:1 stock.

It is generally accepted that the target AFR for maximum torque is around 12.5:1. Of course all engines are different and will need to be fine tuned to find their "sweet spot". But, it's always richer than stoichiometric (14.7:1). The bottom line on your pull was that there was a surplus of oxygen in the cylinder that more fuel could have been burned with.

It'd be helpful to see the AFR that Ryder276 ended up with after his custom tune.

I wish you luck, man. I'd be pissed about a $600 box that needed a $300 custom tune to work right.

[that1seven]

Originally Posted by 123456999

The most obvious reason is because your AFR was at 15.1:1 with the Unichip and around 12:1 stock.

It is generally accepted that the target AFR for maximum torque is around 12.5:1. Of course all engines are different and will need to be fine tuned to find their "sweet spot". But, it's always richer than stoichiometric (14.7:1). The bottom line on your pull was that there was a surplus of oxygen in the cylinder that more fuel could have been burned with.

It'd be helpful to see the AFR that Ryder276 ended up with after his custom tune.

I wish you luck, man. I'd be pissed about a $600 box that needed a $300 custom tune to work right.

yeah 11.6 is wut stock afr was.
i should have time tomorrow during work to give unichip a call, but yes 15.1 is really lean idc if computer suppose to adjust, if computer would adjust it , it wouldn't be 15.1 coming out of exhaust

i'll try to call them tomorrow since, nola said they tried calling me but never had a single call from them.. except once when i left message n they called back.. other than that nothing

[NOLA_1906]

Originally Posted by Ryder276

I told him about sometimes getting a "bog" or hesitation with "b" map and he said that was because of too much timing
(computer was retarding timing as shown on run below )

Good runs Ryder. I see you're in California. Can you access 93 octane fuel? Because if you put in 91 octane premium instead of 93, you will get pinging on map B. Unichip tuned map B for 93. Once the knock sensors sense pinging it will retard timing and your power will be below stock. Try some octane booster or xylene at the very least. You're also running on a Mustang dyno which reads lower than others.

[Ryder276]

Originally Posted by NOLA_1906

Good runs Ryder. I see you're in California. Can you access 93 octane fuel? Because if you put in 91 octane premium instead of 93, you will get pinging on map B. Unichip tuned map B for 93. Once the knock sensors sense pinging it will retard timing and your power will be below stock. Try some octane booster or xylene at the very least. You're also running on a Mustang dyno which reads lower than others.

No i dont have access to 93. (i'v been using 91)
The tuner took a little timing out so i can use 91

[NOLA_1906]

Originally Posted by that1seven

yeah 11.6 is wut stock afr was.
i should have time tomorrow during work to give unichip a call, but yes 15.1 is really lean idc if computer suppose to adjust, if computer would adjust it , it wouldn't be 15.1 coming out of exhaust

i'll try to call them tomorrow since, nola said they tried calling me but never had a single call from them.. except once when i left message n they called back.. other than that nothing

Try calling them and ask to speak to Mike Timmons or Jack Friedman. I was told that the 15:1 you saw was a dyno quirk because of the way you have to run the tundra to keep it from downshifting. The way your dyno was run, the tundra went into fuel saving mode, as it would during a towing situation. I think this is typical on dynos with the Tundra. It senses load, but the throttle is opened gradually over a specific amount of time. In a stock situation, the ecu senses this and goes from 12:1 for power, to 13:1 or more for better towing economy. The Unichip adjusted the stock values on the dyno by two points or so, going from 13:1 to 15:1. 15:1 to 15:5 gives better fuel economy than stoich or less. The key is that it really wasn't a WOT situation requiring a rich condition because of a number of variables. Load, duration, throttle position, and other sensors that I have no clue on. In a true WOT situation, which you can only do on the street because of downshifting on a dyno, your Unichip adjusted AFRs would be around 13:1 instead of 12:1 or as low as 10.5-11:1 for the best combination of power and economy. Once you are actually able to run it without downshifting, you hit the speed limiter which limits the potential horsepower. In the near future, we'll be able to get off some clean runs...Don't lose faith in the product. It is a VERY capable tuner. You really need to speak with Jack on the phone so that he can fully explain the situation. He understands the Tundra's components better than we do.

[NOLA_1906]

Originally Posted by Ryder276

No i dont have access to 93. (i'v been using 91)
The tuner took a little timing out so i can use 91

Great! That was the key to your poor performance on the B map. Everyone needs to understand this. Don't run the B map on anything less than 93. Your performance will be below stock because the ecu will pull timing.

[Rut]

Originally Posted by Ryder276

The tuner couldnt get my truck to dyno in third, -it kept down shifting to second so thats what these runs are at.
First run done with no unichip, #2 unchip with unichips map, #3 custom tune.

So the Unichip dyno run (before custom tuning) shows that between 2893 and 3426 RPMs that the chip actually lost significant HP and torque than the stock run? Can somebody explain this? Am I missing something?

[NOLA_1906]

Originally Posted by Rut

So the Unichip dyno run (before custom tuning) shows that between 2893 and 3426 RPMs that the chip actually lost significant HP and torque than the stock run? Can somebody explain this? Am I missing something?

Computer retarded timing because he ran the B map with 91 octane instead of 93 octane. His tuned map is the result of the tuner pulling some timing from the Unichip map to prevent the Tundra's ecu from sensing knock and retarding timing.

[Rut]

Thanks Nola for the quick response