Spartan 350 tune

[08spartan250]

Does any one have any info on the new 350 tune? And dyno or track numbers? And also what you need to upgrade to be able to run this tune? (head studs, etc..) Thanks!

[MississippiJoe]

I am sure Jeff will jump on, but what I read the track times were a little slower than the 310. Not sure if was a traction issue or not.

[08spartan250]

Originally Posted by MississippiJoe

I am sure Jeff will jump on, but what I read the track times were a little slower than the 310. Not sure if was a traction issue or not.

thanks. i'll wait and see what everyone says.

[as6.4stroke]

the upgrades are head bolts and a built trans i maybe leaving something out ,but i know some guys that are running it with out either one of these upgrades.

[HoosierHick]

I think an egr delete kit with wastegate would also be recommended/beneficial.

I do know that this is definitely more of a race tune, not a DD. If you are looking for a big number DD go with the KEM 345.

Wait for Jeff to chime in, he works a lot with this tune and has ran it at the track/compared it to the 310 as much as anyone. I'm sure there is a lot of potential with the 350, I think the main issues are putting the power to the ground (trans/traction).

[jhaddox]

i run it as a dd...i dont have my trans in yet(the stock trans doesnt like it, but i run my truck hard)...im putting in arp studs(dont have a blown hg...just upgrading for future stuff)

you can run it with a stock transmission and no studs...just watch your drive pressures and dont beat on it all the time and you'll be ok

[EvilTwins]

I also run the 350 as a daily driver and have the aforementioned mods, minus the tranny, still stock. I believe that Jeff indicated in another post that the 350 was giving up the goods on the dyno but not on the track. I'm sure he and Matt are working on the refinements. My Christmas will come when the much anticipated TCM tune upgrades are released in conjunction with the 350 refinements. I'm not asking for too much.....right.

[08stroker250]

Here is the rundown.....traction is definitely an issue at the track with this tune. Rail pressure is not an issue however. The best thing to do with this tune at the track is to not stage until the second bubble. If you stage early, the throttle is soooooo touchy that your foot will bounce on the pedal with any movement....including inching up from the first bubble to the second at any RPM higher than idle.

Track time comparison is in favor of the 310 tune by about 8/100 of a second. The 350 tune, however, made 38 more horsepower on the dyno during tune testing. Same dyno, same day, same EVERYTHING.

My truck made 572/1157 at 38 psi of boost and 99 degree, high humidity heat. This was at TS Outlaw in Bowling Green, KY on July 24, 2010. Dyno was David Dunbar's mobile dyno.

As far as upgrades.....a torque converter would definitely be ideal with this tune. Mine lasted a week with the tune and some pretty intense testing. I went from 65-75 RPM of slip with the 310 to well over 200 RPM of slip with the 350 tune. I was seeing well over 100 RPM of slip at 3/4 throttle with the converter locked.

[EvilTwins]

My truck made 572/1157 at 38 psi of boost and 99 degree, high humidity heat. This was at TS Outlaw in Bowling Green, KY on July 24, 2010. Dyno was David Dunbar's mobile dyno.

Jeff, was 38 psi of boost where the truck made the most power or was that all the boost you got due to the crappy atmospheric conditions? Im seeing 48 to 50 psi of boost with this tune. Understanding that max boost doesn't always mean max power.

[08stroker250]

Originally Posted by EvilTwins

Jeff, was 38 psi of boost where the truck made the most power or was that all the boost you got due to the crappy atmospheric conditions? Im seeing 48 to 50 psi of boost with this tune. Understanding that max boost doesn't always mean max power.

That was all of the boost it would make......and at 71 psi of back pressure (85 psi on the reading), the ratio SUCKS. If it had made 45-48 psi on the dyno, it wouldn't have been so close to 2:1 drive to boost ratio, and would have most likely made more power. That is just an educated guess of course.