Questions on Engine Builds & TMAT Tuning

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08-16-2008 | 10:06 AM

Plow64

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From: Northern VA

Questions on Engine Builds & TMAT Tuning

Folks, your help with a few questions on TMAT Dyno tuning & break in procedures for a new build engine would be greatly appreciated.

Background: I'm having an engine built in October and will drop the bike off at a speed shop shortly thereafter for a dyno tune (authorized TMAT tuner). The bike will be set up with TMAT, D&D Fatcats, Zippers hi flow a/c, bored engine case, new high flow heads, cylinders, pistons, S&S 4.5 flywheel, S&S 640 gear drive, S&S lifter shims, Jims Roller Rocker Arms, Timken Bearings, etc.

Questions that come to mind are:

What is the best break in procedure(s) for a new build engine? Is it the same procedure used for a new Harley off the showroom floor? Should the engine be broken in prior to having it dyno tuned? Seems like it should be, but is it necessary?
TMAT experts correct me if this next part is wrong: with the TMAT, the tuner will basically create a custom map for the engine starting with a base map that is as close to the build as possible. Once that custom map has been created, in theory, the bike is as well tuned for race conditions as it will ever be, given the ambient conditions during the tuning process. If this is correct, it seems that the TMAT should then be put into open loop, vice closed loop, in order to prevent the AT function from creating fuel offsets, thus "dulling" the perfect race tune. My riding habits are 80% cruise, 20% haul ***. Given my riding habits and the desire to retain the perfect race tune at all times, should the TMAT be put into open loop after the dyno tune to "lock in" the race tune? Your thoughts on this are especially welcome.

I'll definitely discuss this in depth with the builder and the tuner, but wanted to tap the vast expertise here on HDF first in order to be a bit smarter prior to those discussions.

Any advice or recommendations appreciated. Mucho garcia in advance.

Plow

Last edited by Plow64; 08-16-2008 at 10:14 AM.

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08-16-2008 | 01:10 PM

ToBeFrank

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Joined: Apr 2006

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From:

Quote:

Originally Posted by Plow64

[*]What is the best break in procedure(s) for a new build engine? Is it the same procedure used for a new Harley off the showroom floor? Should the engine be broken in prior to having it dyno tuned? Seems like it should be, but is it necessary?

The tuner should be able to break it in on the dyno.

Quote:

[*]TMAT experts correct me if this next part is wrong: with the TMAT, the tuner will basically create a custom map for the engine starting with a base map that is as close to the build as possible. Once that custom map has been created, in theory, the bike is as well tuned for race conditions as it will ever be, given the ambient conditions during the tuning process. If this is correct, it seems that the TMAT should then be put into open loop, vice closed loop, in order to prevent the AT function from creating fuel offsets, thus "dulling" the perfect race tune. My riding habits are 80% cruise, 20% haul ***. Given my riding habits and the desire to retain the perfect race tune at all times, should the TMAT be put into open loop after the dyno tune to "lock in" the race tune? Your thoughts on this are especially welcome.

The tune will be set up for the exact conditions it was tuned in. Leave it in closed loop so it can adjust for altitude, weather changes, etc. It shouldn't have to adjust much from your tune, but that way you should always have a perfect tune.

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