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Old 01-10-2020, 02:29 PM
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freddie freddie is offline
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Default 364.5 vs 366 SXE for my truck?

I've read and reread all of the SXE threads to the point I'm dizzy. Thought I'd just post it and see what everyone's thoughts are.

230/100 injectors, all of the associated mods.
E4OD
4.10 gears (I have 3.55 but plan to make the swap this year to 4.10s)
35" tires
Will try tunes from a couple different tuners

Priority is moderate to heavy tow performance. Really want this truck to tow great. We have a lot of 55mph roads with hills, I envision a truck that does not break a sweat, minimal downshifting, etc. Not going to have it on the track or anything, but I'm sure I'll spool it up for grins.

I think I have it narrowed down to the 364.5/.91 and 366/.91 based on everyone's feedback on here..

If I was sticking with the 3.55 gears I think the 364.5 would be the way to go, but once I install the 4.10s, would I wish I had the 366?

Let's hear it?
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Old 01-10-2020, 03:17 PM
Zeb Zeb is offline
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364.5/73/.91 You’ll be 2,200-2,400 rpm in direct at 55-60 mph and 35” tires. The 364.5 will be rocking at those rpm.

366 would work quite well at those rpm, but will spool a touch slower on take off, etc.
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Old 01-10-2020, 04:11 PM
JCart JCart is offline
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If it was me I’d do 364.5/.91 A/R exhaust housing for quicker spool, will be better for towing in hilly terrain. 3:55 gears will work, pending how heavy you tow and would work good with 364.5 too. I’d want the quicker spool with the auto tranny too, such a pain in the arse to try towing when under the turbo... resulting in Smokey hot EGTs. In respect to tunes, recommend Jelibuilt, been really happy with mine so far and Brian has been quick to respond to questions.
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Last edited by JCart; 01-10-2020 at 04:15 PM.
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Old 01-10-2020, 04:12 PM
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chaselee chaselee is offline
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I'm running the 364.5, 205/80 full force injectors, 37s and 4.10s. truck runs great and spools fast.
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Old 01-10-2020, 05:06 PM
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Quote:
Originally Posted by Zeb View Post
364.5/73/.91 You’ll be 2,200-2,400 rpm in direct at 55-60 mph and 35” tires. The 364.5 will be rocking at those rpm.

366 would work quite well at those rpm, but will spool a touch slower on take off, etc.
Devils advocate-once you're moving, the 366 will be your friend when you get to a hill, in direct, and pushing 28-3000 rpms.
Itll depend on driving style and conditions.
You have plenty of fuel available, the only limit would be how often you tweak the tunes.
If you are spending more time midrange and up, i.e. going down the road, the 366 would be the better bet. Lots of time stoplight to stoplight, the 364 would be less headache, trade off being a limited top end.
How much load will you be seeing? Empty truck, diving around, or hooked to a 5ver with 8-10k+ chasing you?
It does make a difference.
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Old 01-10-2020, 05:25 PM
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All great points so far, thank you all.

I plan to haul my buddy's truck to some events on a gooseneck, around 13-15k. Not every weekend but yeah.

Driving is mixed I guess. I'm just torn. Lol. Probably can't go wrong with either I guess?
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Old 01-10-2020, 05:43 PM
Back woods Back woods is offline
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366
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Old 01-10-2020, 11:08 PM
cjfarm111 cjfarm111 is offline
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No personal experience with those size but I would think the 366 would be fine. I like my 364.5 but I’m only running 180/80’s. Must likely though a tow tune with your injectors will be fine with the 364.5 and it will spool a little faster. Unless you plan on racing or running a hot tune all the time I would stick with the 364.5.
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Old 01-11-2020, 05:23 AM
Back woods Back woods is offline
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The 366/.91 does spool really well. I run one on my truck with stock split shots. It makes 20psi @ 2000rpm. If you are towing at 1700rpm it can be lazy but starts coming alive at 1800rpm. Gives you some room to mess around with tuning as well.
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Old 01-11-2020, 08:23 AM
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I've run both on my truck with my 175/80's and towed a lot with them. With the large turbine version of the 364.5 and .91, both turbo's spool very similar from stand still. The 364 *MIGHT* be a little quicker. Once under boost, the 364.5 is much more responsive to throttle input. Daily driving, the 364.5 is better but it feels like a smaller turbo as it is. It doesn't have the mid and top end the 366 has. Towing, I think the 366 was better because it is constantly spooled and is great. No difference in EGT's I observed.

In my case, I moved to a high elevation (5,000) and going to the 364.5 was helpful, but I'm also dealing with crappy nozzles on my PIS injectors and emissions now so getting more response was something I thought would be good in combination with the high altitude.

Just depends where you want the benefit most.
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