Vortech users..need help. went from S to T and slowed down

[blwn327]

I recently switched from a S-trim to a T-trim (and Mondo Bypass). I was running a 2.95 pulley on the S-trim and was seeing about 11-12psi.....I put a 3.15 pulley on the T-trim figuring I would offset the additional boost I would get from the bigger blower and keep the boost near the same 11-12 psi.

I usually trap 122-123....went out last Fri and slowed down to 119 and was only seeing 9psi. There was no belt slippage and the difference between a 2.95 and 3.15 is minimal .....I have seen test between S & T trim with the same pulley and the T making 6-8 more psi in the upper RPM. Any suggestions (besides the obvious smaller pulley)?

[Andrew]

I recently switched from a S-trim to a T-trim (and Mondo Bypass). I was running a 2.95 pulley on the S-trim and was seeing about 11-12psi.....I put a 3.15 pulley on the T-trim figuring I would offset the additional boost I would get from the bigger blower and keep the boost near the same 11-12 psi.

I usually trap 122-123....went out last Fri and slowed down to 119 and was only seeing 9psi. There was no belt slippage and the difference between a 2.95 and 3.15 is minimal .....I have seen test between S & T trim with the same pulley and the T making 6-8 more psi in the upper RPM. Any suggestions (besides the obvious smaller pulley)?

My experience is that the T trim was worth more power than the S trim. I was using 28/72 tooth cog pullies and spinning 6000 rpm.

The T did lag a bit behind the S until the higher rpm ranges. Also perhaps weather had something to do with it? Weather can cause boost changes as well as power.

Try spinning the hell out of the T trim! :D

[blackjack]

dont you hate that kind of shit, hope it works out

[AdamLX]

I was running a 2.75 pulley on my T-trim and was making 18psi @ 6K with a pretty well breathing motor.

I'd triple check your vacuum lines to and from the bypass as well as the bypass.

[blwn327]

Iwill re check everything when i get home.....

[46Tbird]

Yep, something is wrong. 9lbs of boost ain't right.

[Moose Jr]

I recently switched from a S-trim to a T-trim (and Mondo Bypass). I was running a 2.95 pulley on the S-trim and was seeing about 11-12psi.....I put a 3.15 pulley on the T-trim figuring I would offset the additional boost I would get from the bigger blower and keep the boost near the same 11-12 psi.

I usually trap 122-123....went out last Fri and slowed down to 119 and was only seeing 9psi. There was no belt slippage and the difference between a 2.95 and 3.15 is minimal .....I have seen test between S & T trim with the same pulley and the T making 6-8 more psi in the upper RPM. Any suggestions (besides the obvious smaller pulley)?

Are you using the same belt from the s-trim?

[AL P]

First I'd put the other pulley on the T-trim. You don't want to turn a T-trim that slow. You got to spin that sucker to make power. It is possible that you just aren't turning it fast enough to get out of the midrange where it lags behind the S-trim.

Also check the bypass valve. It could be blowing open under boost. Tighten that center stud on it a few turns and see if you pick up some boost.

[Murph Tang]

First I'd put the other pulley on the T-trim. You don't want to turn a T-trim that slow. You got to spin that sucker to make power. It is possible that you just aren't turning it fast enough to get out of the midrange where it lags behind the S-trim.

Also check the bypass valve. It could be blowing open under boost. Tighten that center stud on it a few turns and see if you pick up some boost.

yep if the bypass is still the same then it still will release with same amount of boost.

Drop that pulley size and you'll feel the difference.

[blwn327]

I am using the same belt as the S-trim....it's got plenty of belt wrap as I previously went with a longer belt and bigger idle pulley to get more surface area...and watching the gauge, it's not slipping.

I am going to toss the 2.95 back on and see what it does... It will be this weekend before I get around to it as I have to pull the intake as I am getting some water seepage from the back of the intake.