TVS peeps: 2.8 and 4 lb pulleys too much?

[YGETV8]

In the process of going E85 and that's my pulley combo now. I do have Mac long tubes. I've seen at least one other person running it.... Too much? Thanks, Jay

 

[greenflash00]

I've been tempted to try a pull with this myself when I get the longtubes on :lol: It would probably be stretching the limits though yeah..you'd be at nearly 25lbs on that. I've seen as high as 21lbs on my 2.8 upper with stock lower on a really cold day.

 

[Shadow Grey 03]

I asked Justin and he said the 3.0/4lb combo is it for a stock cammed car. Port the heads and put a set of cams in, then go with the 2.8/4lb setup.

 

[Senkak]

I run a 3.0/4lb with LTs.

 

[Nolimit]

What power up/tq does that output?

 

[Senkak]

What power up/tq does that output?

Not sure as all of Cliffs tuning is done at the track.
It is enough to run 8.9s.
If I had to guess 750-775hp/725+ Tq

 

[SYMach1]

Really want to try 2.8 pulley with my 4lb at somepoint

 

[Nolimit]

Is it because we will be over spinning the blower? Is there where larger blowers come into play? Will head work balance this layout?

 

[Senkak]

Really want to try 2.8 pulley with my 4lb at somepoint

Do it!!

Is it because we will be over spinning the blower? Is there where larger blowers come into play? Will head work balance this layout?

24lbs is the max recommended RPM for the VMP TVS 2.3.
This is based upon rpm. People have spun the blower past that point.

 

[SYMach1]

If my motor will like me...maybe ill talk to justin

 

[YGETV8]

If my motor will like me...maybe ill talk to justin

Stock motor?

 

[SYMach1]

Bone stock 37k motor

 

[Wicked46]

I also run the 3.0/4lb lower like Rick. You'll be fine with a 2.8 upper as long as the tune is safe with the stock motor.

 

[Nolimit]

Do does performing head work, allow for a increase in boost or only benefit the engine by operating more efficent?

 

[YGETV8]

Head work should actually lower boost due to increased flow.

I was going to try my 2.8/4# on the dyno but my 3.0/4# was already running warm enough to pull timing so we thought it silly to heat the air up even more. I'm looking at going with a killer chiller....then maybe I'll try it. ;-)

 

[03Steve]

Cliff runs a 2.8/6lb and 7300rpms on an aftermarket engine combo. Peak blower RPMs are 9.1/2.8 * 7300. Estimated engine output is between 944-969 based on time, mph, weight. Switching to an 8lb next.

 

[SVT_Troy]

Excuse my ignornace but i dont want to assume. What is the benefit for running a lower pulley versus just an upper? Ive been an upper only guy for awhile but always see others running lowers.

 

[cj428mach]

Excuse my ignornace but i dont want to assume. What is the benefit for running a lower pulley versus just an upper? Ive been an upper only guy for awhile but always see others running lowers.

Less belt slip by keeping the upper pulley diameter larger. Some people claim a gain in torque I don't know if anyone has done a back to back dyno testing different pulley combos at the same boost level.

 

[YGETV8]

Cliff runs a 2.8/6lb and 7300rpms on an aftermarket engine combo. Peak blower RPMs are 9.1/2.8 * 7300. Estimated engine output is between 944-969 based on time, mph, weight. Switching to an 8lb next.

That's it - I'm installing a Killer Chiller and putting my 2.8 back on! ;-)