Does anyone have an answer to this?

[FuelSlut]

Ok, so maybe some of you experienced this before, but I run a 17# pulley on my KB, and a 19# pulley w a race gas tune. The problem Im having is that I only see 15#'s of boost on the 3.0 pulley and about 17.5 to 18 psi on the 2.8 pulley.

Now I took it out last night and messed around with it a little in the cool weather it definetly runs good, but I just cant seem to get past that 15psi mark. 1PSI loss is ok but 2 is too much. What do you guys think do I need a different intake like a JLT? There is no belt slip on the 3.0 pulley and a little on the 2.8 due to it being so small. Should I go to a 2# lower will this help?

I have seen the boost jump up the last 600-700 RPM but I have to keep my eyes on the road so I cant always look at the boost gauge. When does the boost usually max out? I also dont have boost drop off wich is good. I just wanna figure this out because there is more power in my car I just have to get it to 17Psi. I also run the Reichard Racing pulleys maybe this is the problem I never did like them.

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[rdsnake]

Ok, so maybe some of you experienced this before, but I run a 17# pulley on my KB, and a 19# pulley w a race gas tune. The problem Im having is that I only see 15#'s of boost on the 3.0 pulley and about 17.5 to 18 psi on the 2.8 pulley.

Now I took it out last night and messed around with it a little in the cool weather it definetly runs good, but I just cant seem to get past that 15psi mark. 1PSI loss is ok but 2 is too much. What do you guys think do I need a different intake like a JLT? There is no belt slip on the 3.0 pulley and a little on the 2.8 due to it being so small. Should I go to a 2# lower will this help?

I have seen the boost jump up the last 600-700 RPM but I have to keep my eyes on the road so I cant always look at the boost gauge. When does the boost usually max out? I also dont have boost drop off wich is good. I just wanna figure this out because there is more power in my car I just have to get it to 17Psi. I also run the Reichard Racing pulleys maybe this is the problem I never did like them.

100 % belt slip, 3.0 upper only will slip a ton! ..... Get a lower setup. It should fix it.

Remember, your spining that thing at like 10,000 RPM or so...theirs gonna be slip with that small upper...

I'm running 3.4 upper/4 # lower (25 psi pulley combo) but I only see 23-24 due to cams/long tubes.

Bigger upper/Bigger lowers = no slip

 

[Flyn]

Could be free flowing exhaust, too. The more air out, the less boost in.

 

[FuelSlut]

100 % belt slip, 3.0 upper only will slip a ton! ..... Get a lower setup. It should fix it.

Remember, your spining that thing at like 10,000 RPM or so...theirs gonna be slip with that small upper...

I'm running 3.4 upper/4 # lower (25 psi pulley combo) but I only see 23-24 due to cams/long tubes.

Bigger upper/Bigger lowers = no slip

I see, it looks like its time for a metco lower. Now if I change the lower and I still run the same amount of boost I dont have to get a retune right? It shouldnt matter of the pulley combo as long as Im running the same boost that my tune is for. Now you also run the 2.8H right If I get the 4# lower wich upper pulleys do I need for 21psi and 17psi? I have the 2.2l.

 

[FuelSlut]

Could be free flowing exhaust, too. The more air out, the less boost in.

This could be a factor as well, I need to figure out if I want the 2# lower or 4#.

 

[Bob_Kurgan]

belt slip... and get rid of the the "belt shredder" pulley.. JUNK!

 

[FuelSlut]

belt slip... and get rid of the the "belt shredder" pulley.. JUNK!

What pulley do you reccomend Bob? Billetflow?

 

[rdsnake]

Billet flow are the best uppers IMO

 

[Big Cam Z28]

Could be free flowing exhaust, too. The more air out, the less boost in.

uh, i think its the opposite. back pressure is bad when you are boosted.