TVS 1900 on a 408 enough cfm?
#12
Originally Posted by smokinlmm's thought process
hmm... zebra sure brought up a good point in my thread about a 1900 not having the sclitz to feed a 408....nah, f*** that guy & his 10yrs of digging into TVS builds on LS engines - that hillbilly don't know nothin'

i should make a new thread to ask everybody else what they think. yeah.
but i will recommend verifying your CFM requirements against the map.

#13
When I had my side mount Whipple 2.3 (the TVS 1900 and my Whipple were always compared for some reason) on a 408 it ran great. I was always told it would only make heat past maybe 7 psi. I heard that so much that it had to be people repeating what they read on forums. I have a 24" x 18" x 4" intercooler, and my IATs maxed out around 20° above ambient. I could only get 11 psi out of the setup with the blower pullied for maximum safe rpm. People actually told me that the blower would not make more boost if I sped it up when I was running in the 7 psi range, it would only make more heat. I still don't understand what that is supposed to mean. I'm glad I can't read an efficiency map. I'm sure a larger blower would have been more efficient, and I still wish I had one, but my 408 ran great with what I have.
#15
yeah, it's more about the cooling efficiency for the required airflow than the simple ability to move the same amount of air.
i watched a guy spin an old MP112 to the moon on a 402... dynoed 700tq @ 13psi but was so out of air up top that it only equated to 600hp. after some custom drive work & bigger inlet, he got it up to 20psi. his next round of mods opened up the blower & heads to reduce restriction (boost) & thus temps... got him to 620h/730t @ 16psi (which dropped to 12 by 6000rpm) & 130° meth-cooled IATs.
my 346 with a 2300 and no meth, on the other hand, is making ~50 more hp with ~80 less torque and 3 less pounds of boost.
as for IATs, one thing the trucks have is vertical space - which allows room for one of them phenolic or resin plenum spacers. they drastically improve intake temps & airflow by providing more room under the intercooler brick... they're just tough to come by nowadays.
i watched a guy spin an old MP112 to the moon on a 402... dynoed 700tq @ 13psi but was so out of air up top that it only equated to 600hp. after some custom drive work & bigger inlet, he got it up to 20psi. his next round of mods opened up the blower & heads to reduce restriction (boost) & thus temps... got him to 620h/730t @ 16psi (which dropped to 12 by 6000rpm) & 130° meth-cooled IATs.
my 346 with a 2300 and no meth, on the other hand, is making ~50 more hp with ~80 less torque and 3 less pounds of boost.
as for IATs, one thing the trucks have is vertical space - which allows room for one of them phenolic or resin plenum spacers. they drastically improve intake temps & airflow by providing more room under the intercooler brick... they're just tough to come by nowadays.
Last edited by _zebra; Oct 9, 2021 at 11:24 PM.
#20
I've been looking at the maps for all 3 chargers. I have also been reading conflicting info that has been posted by people who use and understand these chargers. Blownchevy for one says you can spin the hell out of a 1900 and move enough air without worry but, I know the 1900 is recommend at 18k max rpm. There are guys spinning them over 22k and make big power is seems. Does anybody on here use the rpm sensor for the tvs or is it a waste of money and time?
Last edited by smokinlmm; Oct 10, 2021 at 09:38 AM.








