Engine/Transmission (1998.5 - 2002) any body with a TM

[hdtrukn]

Just dynoed my truck after installing 275s,

stock was 170. 5, now 217. 5.

Happy with that cost per dollar gain.

While it was on the dyno changed ECM to TM.

Made another run, lost 4hp ?

Did not get torque numbers on any run.

Could not get optical pickup to work. Any tricks ?

Any ideas from anyone ?

Thanks

Scott

 

[LSMITH]

I have one, and have not dyno tested it but I know I gained power. The power gain I feel is mostly in the 1700-2500 range, and it pulls out harder over 2900 than the stocker did, with the TM it pulls to 3400 where it used to just give up at 3000. With the stock ECM I was able to make 18 PSI of boost at 1600 RPM in a power braking situation to load the engine heavily, it would smoke and pull but 18 PSI was the top end for 1600 rpm. Add the TM ECM and the same test on the same day 20 minutes apart I got scared at 34 PSI. It pulled 34 PSI of boost at 1600 RPM with very little smoke, it ran right through the brakes and the tires broke loose, I darn near looped it in the highway. I have not repeated the test, I am scared it will break something. The difference in power under load is great on my truck, and I saw nearly 2 mpg gain in fuel economy at 70+ mph on the freeway.



The only downside I have seen is a little more noise, that has to be coming from a little more timing than the stock ECM.



I run a VanAaken w/a seperate boost module, and DD3's with mine. I have never run the TM without injectors (DD1's or larger), but without the VA the difference between the stock ECM and the TM is even more evident.