[Saberscar223]

I was wondering if it would be beneficial at all to upgrade to the LT4 Fuel system while N/A running full E85. I don't know exactly how much my car is pushing but cars with very similar setups are in the 550-580whp range. Am I being limited by the stock LT1 fuel system at all?

2023 A10 SS Ported Heads/Stage 2 Cam/E85/2"LTH/CAI/Ported MSD/95mmTB.

[Hostile_1LE]

What cam do you have? I think NA the stock fuel system is good to 600 or so whp. Much less with boost.

[Saberscar223]

Originally Posted by Hostile_1LE

What cam do you have? I think NA the stock fuel system is good to 600 or so whp. Much less with boost.

BTR 225

[FlukeSS]

Originally Posted by Saberscar223

BTR 225

I'm running a BTR220 with stock LT1 fuel system, no issues.

As it pertains to the issue I had with my car and your question: The fueling issue I had I believe is now resolved and wasn't a fueling issue persey, but a loose plugwire which blew out the orginal spark plugs, and the replacement sparkplugs I had were not properly gapped for my engine as my engine does not use a stock spark plug gap.

[Saberscar223]

Originally Posted by FlukeSS

I'm running a BTR220 with stock LT1 fuel system, no issues.

As it pertains to the issue I had with my car and your question: The fueling issue I had I believe is now resolved and wasn't a fueling issue persey, but a loose plugwire which blew out the orginal spark plugs, and the replacement sparkplugs I had were not properly gapped for my engine as my engine does not use a stock spark plug gap.

Oh okay I see, also with your TCM tune do you visually see the car shift above recline? Mine looks like it shifts at the stock shift point rpms of like ~6500

[FlukeSS]

Originally Posted by Saberscar223

Oh okay I see, also with your TCM tune do you visually see the car shift above recline? Mine looks like it shifts at the stock shift point rpms of like ~6500

Yes, Basically shift points can be controlled in 3 basic ways to my current knowledge if there is more to it beyond that the tuner guys will chime in.

1. Manual Mode Shifting - Done with RPM range only I believe.

2. Drive Modes - Speed and RPM range determine when the car shifts there is a lag time between the two sensors. Each Drive mode also has variances from one another, but I tuned my Track Mode and made the same speed changes to all modes as I did track. Have not had an issue.

In my case: I had to manually adjust the shift speed and lower my shift RPM to 6400. Originally the car ran fine at 6800 shift rpm, but speed was off. So the car was hitting rev limiter at 7500 rpm's.

Now I have it dialed in for Track Mode, and my Manual shifting is done automatically the only thing I have to manage in manual mode is down shifting. Upshifts are set to automatically shift at 94-100% throttle. This is more geared toward roll racing with how my manual mode is set up. Also note: You cannot do a dyno run in manual mode with this setting, so you'll need a reversion tune so the car does not shift in manual mode at all if you plan to do a dyno run.

But here is a video so you can see my car shifts at 6900-7200 rpms at most. Otpimal shift range for my car is 6900-7200 rpm. Its where my power curve is most comfortable at high speed. Your car may be different with a 225 cam, and your MSD allows for higher RPM shifting than my LT2 Intake does. So your range might be higher yet.

Lastly I notice you are in Denver, CO. Which I am guessing is higher altitude than where I am at 900 ft above sea level. Your shift range may vary because of altitude as well.

[Saberscar223]

Originally Posted by FlukeSS

Yes, Basically shift points can be controlled in 3 basic ways to my current knowledge if there is more to it beyond that the tuner guys will chime in.

1. Manual Mode Shifting - Done with RPM range only I believe.

2. Drive Modes - Speed and RPM range determine when the car shifts there is a lag time between the two sensors. Each Drive mode also has variances from one another, but I tuned my Track Mode and made the same speed changes to all modes as I did track. Have not had an issue.

In my case: I had to manually adjust the shift speed and lower my shift RPM to 6400. Originally the car ran fine at 6800 shift rpm, but speed was off. So the car was hitting rev limiter at 7500 rpm's.

Now I have it dialed in for Track Mode, and my Manual shifting is done automatically the only thing I have to manage in manual mode is down shifting. Upshifts are set to automatically shift at 94-100% throttle. This is more geared toward roll racing with how my manual mode is set up. Also note: You cannot do a dyno run in manual mode with this setting, so you'll need a reversion tune so the car does not shift in manual mode at all if you plan to do a dyno run.

But here is a video so you can see my car shifts at 6900-7200 rpms at most. Otpimal shift range for my car is 6900-7200 rpm. Its where my power curve is most comfortable at high speed. Your car may be different with a 225 cam, and your MSD allows for higher RPM shifting than my LT2 Intake does. So your range might be higher yet.

Lastly I notice you are in Denver, CO. Which I am guessing is higher altitude than where I am at 900 ft above sea level. Your shift range may vary because of altitude as well.

Also odd your car still has the cool pop sound in between lower shifts, my car stopped doing that after the TCM was tuned and the Tq manager was off.

[Megahurtz]

Originally Posted by Saberscar223

Also odd your car still has the cool pop sound in between lower shifts, my car stopped doing that after the TCM was tuned and the Tq manager was off.

Turning Torque Management off causes the ECU to not pull timing on the shift. Without this, the car wont pop between shifts.

I prefer to tune the TCM's a little different and don't remove the torque management on shift but I make it shift real fast. Best of both worlds in my opinion.

[KingLT1]

It will be close if it's making good power, but it should be ok. As Jason said when you disable TCM torque reduction, that removes the fuel cut on the shift for the 1-2 & 2-3 shift. That is where the pop comes from.

[arpad_m]

I for one love my shift bangs with the 8L90, ET and 0-60 times be damned

Even though the car may be technically a tenth or two slower with these fuel cut power shifts, it feels 2x more powerful, and a Camaro (or any sports car) is more an emotional than a rational choice anyway.

[FlukeSS]

Just some advice because I don't know how valid it may be in our case since we both use A10's.

I have a stock converter, my shop told me a 220 is the biggest cam they would use with a stock torque converter. 225 might be ok but would be on the verge of concern for the stock torque converter.

I'll let the more knowledgeable guys comment further about that.