rgp6373 Posted August 13, 2008 Report Share Posted August 13, 2008 i seem to be loosing boost on my maggie . down to 5.5 lbs . my question is where could it go on this blower ? the guage seems to be working fine Quote Link to comment Share on other sites More sharing options...
wody Posted August 13, 2008 Report Share Posted August 13, 2008 down to 5.5 from? Quote Link to comment Share on other sites More sharing options...
brobradh77 Posted August 13, 2008 Report Share Posted August 13, 2008 It maybe your Boost regulator..i think thats what its calle...its the small black cyclinder looking thing on the drivers side...remove the hose from the bottom and open the valve all the way and stick your finger over the whole..the valve should stay open...if it starts to close then there is your problem. Quote Link to comment Share on other sites More sharing options...
04CHASE Posted August 13, 2008 Report Share Posted August 13, 2008 id say your spinning your crank pulley or belt slip depending on boost lost and pulley size. but the crank pulley spinning is the most common. Quote Link to comment Share on other sites More sharing options...
rgp6373 Posted August 13, 2008 Author Report Share Posted August 13, 2008 i dont think the belt is slipping seems to consistant for that but i will check the by pass valve Quote Link to comment Share on other sites More sharing options...
rgp6373 Posted August 13, 2008 Author Report Share Posted August 13, 2008 nope not the by pass valve it works fine and i was making about 7.5 lbs of boost before Quote Link to comment Share on other sites More sharing options...
04CHASE Posted August 13, 2008 Report Share Posted August 13, 2008 did you check the crank pulley bolt? Quote Link to comment Share on other sites More sharing options...
misterp Posted August 13, 2008 Report Share Posted August 13, 2008 (edited) 1) Dirty Air Cleaner 2) Other obstruction from air cleaner to j-tube 3) slipping belt, look for black dust 4) crank pulley not pinned 5) exhaust obstruction (blocked/burnt cat?) 6) bad guage - check/verify against MAP using logging software or Aeroforce If it's none of those things maybe it's a boost bypass issue but I doubt it. Mr. P. Edited August 13, 2008 by Mr. P. (see edit history) Quote Link to comment Share on other sites More sharing options...
rgp6373 Posted August 13, 2008 Author Report Share Posted August 13, 2008 how do i check the crank pulley to see if its pinned ? Quote Link to comment Share on other sites More sharing options...
zippy Posted August 13, 2008 Report Share Posted August 13, 2008 You'd have to pull the crank bolt out and look at the area where the pulley and crank come together. If there are pins in there it is pinned. If not I would do it while you have it apart. Quote Link to comment Share on other sites More sharing options...
Krambo Posted August 13, 2008 Report Share Posted August 13, 2008 I am with Zippy and Chase. I'll bet your crank bolt is even loose... Quote Link to comment Share on other sites More sharing options...
rgp6373 Posted August 13, 2008 Author Report Share Posted August 13, 2008 i just recently had a new cam installed so maybe thats it . is it hard to take off can i do it in my driveway ? would it run fine other thn the boost or should there be other problems ? Quote Link to comment Share on other sites More sharing options...
rgp6373 Posted August 13, 2008 Author Report Share Posted August 13, 2008 i just talked to my engine builder and the crank is pinned Quote Link to comment Share on other sites More sharing options...
misterp Posted August 13, 2008 Report Share Posted August 13, 2008 i just recently had a new cam installed so maybe thats it . is it hard to take off can i do it in my driveway ? would it run fine other thn the boost or should there be other problems ? This is an important detail; the camshaft is deep inside the engine and controls how the engine breathes, very few cams are optimized for use with a supercharger and most are meant for use with engines NOT having forced induction. If the cam you have installed is not intended for use with a blower then (oversimplified) the motor is inhaling and exhaling at the wrong times for the blower, and the usual result is blowing boost out the tailpipe during the increased valve overlap period - this will cause loss of boost, significantly lower gas mileage (the fresh air/fuel is being blown right out the open exhaust valve), and big drop in HP. If it is verified that your cam is not blower-friendly and is allowing a lot of fresh/unburned fuel out the exhaust valve then you can expect to destroy your cats in time. So question here is, exactly which cam is in the motor? Mr. P. Quote Link to comment Share on other sites More sharing options...
badass03ss Posted August 13, 2008 Report Share Posted August 13, 2008 are these like the bigger roots type blowers like the 6-71 and 8-71 that have a teflon seal on the rotor? if so and the seal is wore out, then there is another possibility Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.