can LTW single mass 10lbs. flywheel lower boost on S/C?

playskool1 · Sun, Jul-15-2012, 09:29:34 PM

a few months ago i've been logging 5.5psi-6.5psi. clutch gave up at 168k miles during an HPDE event. i replaced with bimmerworld's JB Racing 10lbs. flywheel and clutch master clutch kit. i did a break-in on the clutch setup for about 500 miles. after that the car went back into storage.

it's been almost 3 months, yesterday and today i took it for a spin for about 60 miles. i've been only able to log 4 psi no matter what.

could this be due to the flywheel setup or probably having a boost leak somewhere?

the car still feels very fast but it could be because i haven't driven it for a long period of time.

pbonsalb · Sun, Jul-15-2012, 10:37:25 PM

No. Boost on a centrifugal is not load based in any way. You have another problem. Air leak or slipping belt are the most likely. And yes, I had a centrifugal Vortech with a stock flywheel on my 99M3 and then changed to an AA LTW flywheel, with no difference in boost.

playskool1 · Mon, Jul-16-2012, 12:09:32 AM

Quote:

Originally Posted by pbonsalb

No. Boost on a centrifugal is not load based in any way. You have another problem. Air leak or slipping belt are the most likely. And yes, I had a centrifugal Vortech with a stock flywheel on my 99M3 and then changed to an AA LTW flywheel, with no difference in boost.

thanks. i'll check for air leaks and change out the belt anyways.

Sun, Jul-15-2012, 09:29:34 PM	#1
playskool1 NorCal's Valve Adjustment guy Join Date: Mar 2008 Posts: 3,444 In the garage: '89 BMW 325i '01 BMW M3 Reputation: 0 Location: SF Bay Area	can LTW single mass 10lbs. flywheel lower boost on S/C? a few months ago i've been logging 5.5psi-6.5psi. clutch gave up at 168k miles during an HPDE event. i replaced with bimmerworld's JB Racing 10lbs. flywheel and clutch master clutch kit. i did a break-in on the clutch setup for about 500 miles. after that the car went back into storage. it's been almost 3 months, yesterday and today i took it for a spin for about 60 miles. i've been only able to log 4 psi no matter what. could this be due to the flywheel setup or probably having a boost leak somewhere? the car still feels very fast but it could be because i haven't driven it for a long period of time. __________________ 01[LSB][Cinnamon][6 Spd.]ESS VT475\|3000lbs.\|6.31lbs./hp PM me for valve adjustment and inspection 1&2 deals!

Sun, Jul-15-2012, 10:37:25 PM	#2
pbonsalb Registered User Join Date: Jun 2005 Posts: 1,898 Reputation: 0	Re: can LTW single mass 10lbs. flywheel lower boost on S/C? No. Boost on a centrifugal is not load based in any way. You have another problem. Air leak or slipping belt are the most likely. And yes, I had a centrifugal Vortech with a stock flywheel on my 99M3 and then changed to an AA LTW flywheel, with no difference in boost.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode