WildHorse
N/A or GO HOME
- Joined
- Jun 28, 2017
- Threads
- 217
- Messages
- 8,601
- Reaction score
- 6,665
- Location
- Home World: CLASSIFIED
- First Name
- ⓇⒾⒸⓀⓎ ⓈⓅⒶⓃⒾⓈⒽ
- Vehicle(s)
- '17 S550
- Vehicle Showcase
- 1
With the truck 18 manifold there are slight gains below 6500 rpm vs the 15-17 GT manifold. WHich is great. Gains are gains cause both take a dump at 6500 or so.Maybe I'll block soon or I guess I'll just start PMing the OP for some info since you guys lite the dumpster on fire and killed the thread anyway
That said, just got into when it was suggested it would be a better manifold than the 18+ GT version. Which is utter nonsense. The tune the OP is using is optimized for the original 17 manny with the exception of the CMCV delete or upping the voltage to the CMCV (I forget which one it was). VMP did the same, they didn't play around with the VCT, timing, or anything else to take advantage of the 18+ GT manifold. They just wanted to do a strict 'compare only'. Really you don't even need a tune if you go 18+ GT manny / boss manny / etc. on a 15-17 car because the added airflow is after the MAF so the engine really doesn't give a shit, but at the same time you're not taking advantage of the manny inherited design, which a good tune will.
The simplest explanation of different manifolds is that it'll take the power curve and either move it all to the left or all to the right from baseline. So yeah, you may give up a little bottom end with a 18+ GT manny and gain a little bottom end using the 18+ truck manny. So If I have a NA car for a DD with a 6r80 and 3.15 gears with 27.5 " tall tires (factory height) I may wanna use 18+ truck manny if I don't wanna change the rear gear ratio.
Now on the opposite end of the spectrum, I went with a 2020 intake on my 17, and I upped the gear ratio from 3.31 to 3.73. Do you really think I'm losing and bottom end vs a 3.15/3.31 geared 15-17 NA car with a 18+ truck intake ? No. Do the math and I'm actually making more torque. Yeah I changed the gear and that was an extra expense but you gotta pay to play. Cheers.
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