compression and the TVS
03-10-2009, 05:22 PM
#1
compression and the TVS
im in the process of a build in which i plan on using the TVS in the near future. i will be using the M62 for the time being. at what compression would we see the best gains from the TVS? my build specifically consists of a fully upgraded supertech valvetrain as well as a ported head with JBP stg2 cams. its time for me to buy pistons and im just trying to gain some knowledge before i buy. if their is already a discussion about this please point me in the right direction. thanks in advance css.
03-10-2009, 05:31 PM
#2
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word has been thrown around that the stock CR would be best for applications involving the tvs. There are some who have upgraded their engine internals but all the info isn't quite there yet. Look for threads by lsjwannabe, area47, or fast98. Those threads have information that would lead to an answer. Might take a while searching through the posts but the info is there about the tvs.
03-10-2009, 05:56 PM
#3
yea the stock CR seems to be the number to stick with. but on the same hand you dont see too many people if any getting too far off the beaten path with anything when it comes to these engines. so their could be some huge power just lurking around the corner but no one will know about it untill someone gets a hair up their ass and decides to do something crazy.
03-10-2009, 10:47 PM
#6
personally, i plan on running ~9.3:1 CR. 9.5:1 seems slightly limiting on a TVS to me...course i cant really say, since i dont tune, nor do i have a TVS. However, weisco's 8.9:1 seems too low, mostly due to the fact that these motors seem to lose torque exponentially with lower CRs. I think 9.3:1 would be juust enough under stock to allow full timing and not worry as much about detonation when tuning. Again though...im no tuner, so i dont really have any evidence to back this up. But hey, someones gotta be the first to try it! lol
03-10-2009, 11:34 PM
#7
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You certainly wouldn't want to go any lower than 9:5 however 10:1 or 10:5 is completely feasible high compression in conjunction with superchargers is nothing new
03-11-2009, 01:01 AM
#8
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Witt was running 10.0:1 but also cams which really just evened things out. The drawbacks are greater than the gain imo. So your gaining 2% power roughly going up a half point but your also pulling timing making meth a must with them.
fwiw i did 17* pump 93* and 22* on a 50/50 mix of meth with stock comp and 25 psi. I could only imagine the increased cylinder pressure would result in being able to run maybe 13~14* timing and at that point its either a wash or you have lost power.
fwiw i did 17* pump 93* and 22* on a 50/50 mix of meth with stock comp and 25 psi. I could only imagine the increased cylinder pressure would result in being able to run maybe 13~14* timing and at that point its either a wash or you have lost power.
Last edited by lsjwannabe; 03-11-2009 at 11:35 AM.
03-11-2009, 02:12 AM
#9
Witt was running 10.0:1 but also cams which really just evened things out. The drawbacks are greater than the gain imo. So your gaining 2% power roughly going up a half point but your also pulling timing making meth a must with them.
fwiw i did 17* pump 93* and 22* on a 50/50 mix of meth with stock comp and 25 psi. I could only imagine the increased cylinder pressure would result in being able to run maybe 13~14* timing and at that point its either a loss or you have lost power.
fwiw i did 17* pump 93* and 22* on a 50/50 mix of meth with stock comp and 25 psi. I could only imagine the increased cylinder pressure would result in being able to run maybe 13~14* timing and at that point its either a loss or you have lost power.
06-27-2014, 08:49 AM
#14
it really depends on wat ur end power goal is and wat the car is used for.
if u DD the car. stock compression is the way to go. if u plan to run E85 a little bump to 10.0 or 10.5:1 wont hurt much but it dose bring alot of stress under normal crusing conditions.
id recomend running 9.5:1 and putting a 50 shot on the car. proly the best bang for the buck. these blower cars love nitrous, they respond really well to just a small amount.
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