MPI timing removal vs. Head shim

[TurboM700]

What are the pro's and con's.

Anyone beside MPI done the timing removal yet?

How does the sled act now? Still snappy on the top end? Any draw backs?

I'm (like most people) want to turn the boost up this year and in order to do this I either need to add a head shim or go the MPI wrote.

Sleds an 08 Nytro with a homebuilt turbo very simailr to a MPI or Push 180 kit.

Thanks
Mike.

 

[TurboTime]

Bump as I am interested in hearing some opinions..
Thanks

 

[saskattakman]

same here matt@mpi where are ya?

 

[Dimebag]

I am also interested in hearing how the timing removal works in real life. How much boost you actually can run, and how it performs.
Low-comp is not an option.

 

[sheetwright]

I'm actually doing both on my nytro. Timing change, ignition module from PC, and the shim. That with my larger fuel system lets me run more boost safer on pump gas. Ulmer installed it for me. Looked at other ways but this gave me the most flexibility IMO. Either option can get you a little more boost, but beyond a little more you need more fuel on the nytro. Once you are able to add more fuel you can bump it up a couple more pounds. Seems like each improvement gets you a couple more pounds of boost here or there.

 

[matt@mpi]

What are the pro's and con's.

Anyone beside MPI done the timing removal yet?

How does the sled act now? Still snappy on the top end? Any draw backs?

I'm (like most people) want to turn the boost up this year and in order to do this I either need to add a head shim or go the MPI wrote.

Sleds an 08 Nytro with a homebuilt turbo very simailr to a MPI or Push 180 kit.

Thanks
Mike.

Mike, sorry about not getting in on this sooner. We are against the head shim. It tends to kill the bottom end performance, especially on supercharged sled. Turbo aren’t that bad. The ECU only takes timing out of the top end. If you were to run with just the ECU re flash performance would be down, but the whole idea is to increase the boost a couple of pounds to make up for the loss in HP. So you give up 2-3 hp to gain back 20-30hp? Sounds like a good trade to me.

 

[TurboM700]

Matt,

What will the timing reflash get me?

6pounds at sea level to what? (assuming fuel and intercooler are taking care of)

How much timing is removed at the top end?

Just wondering what my 250 dollars is getting me?

 

[matt@mpi]

Matt,

What will the timing reflash get me?

6pounds at sea level to what? (assuming fuel and intercooler are taking care of)
How much timing is removed at the top end?

Just wondering what my 250 dollars is getting me?

6# at sea level is safe. With the re-flash 8-9#

Safety Flash: In this software recalibration, the engine timing is re-calibrated to reduce ignition timing as water temperature increases and the temperature light illuminates 20 deg F sooner than stock (stock 212F, now 190F). The stock parameters are not sensitive enough to protect the engine while under boost. When the stock program turns on the temp light while on boost, the engine may already have been damaged. Our software flash protects the engine by reducing timing as water temperature increases to help safeguard against engine damage. The rider is also alerted by illuminating the water temperature warning light.
Part # HSE-0060 $299

Reduced Timing Flash: In this software recalibration, the ignition timing tables are re-mapped to compensate for boosted applications. Ignition timing is gradually reduced as the engines load (throttle position) increases which is essential in eliminating engine detonation. The reduction of ignition timing allows for more boost at any given octane fuel. Example: if OEM programming is safe at 5PSI of boost, this re-map would allow 8PSI of boost while using the same fuel. A second example: Vehicles running race gas to allow a given boost level could now be run with pump premium fuel. It many cases this flash can eliminate the need to run a head shim (and remove all the liabilities of having to disassemble and reassemble the engines cylinder head). A good rule of thumb is that this calibration allows for 2 to 3 more PSI of boost without further engine modification or fuel octane increase.
Part # HSE-0062 $299

Safety Flash with reduced timing: In this software recalibration, the safety flash and reduced timing flash are combined to offer the ultimate performance and engine safety package.
Part # HSE-0061 $399 (a $200 savings)

 

[shawnmcgr]

Is this available for he Apex as well?

 

[matt@mpi]

Is this available for he Apex as well?

Not at this time.

 

[shawnmcgr]

Give it some thought! I'd be in. This would payout in 1/2 season for me by eliminating the race gas I blend (8psi super apex @ 6500ft).

I guess mods for the old iron isn't worth the development time.

 

[matt@mpi]

Give it some thought! I'd be in. This would payout in 1/2 season for me by eliminating the race gas I blend (8psi super apex @ 6500ft).

I guess mods for the old iron isn't worth the development time.

It’s worth it but it requires us to physically open up the box. We don't feel comfortable with that?