ok i have the vulcan m62 to ld9 intake manifold . i drove the car dotay and it is running really rich and was only reading 4.5 puonds of boost . i have the 3.1 pulley on there right now. so i was wondering how i would do a boost leak test on this setup seeing as the tb in on the supercharger not the manifold..... not sure if it would matter but i dont have the air oil seperator hooked up to a air intake off the tb yet.. just stating.i watched persoanally as my cousin milled the flanges flat...if you guys can help me out. because im pretty sure the m62 and 3,1 pulley runs more psi then that and i am running rich from my last tune. of the m45 which had a 2.5 pulley and i would always see about 7 psi on that setup and nothing has changed since i took it off here are a couple pics to try and get a jist on how the set up works.
manifold off the car
intercooler
manifold mounted and charge piping
Edited 1 time(s). Last edited Saturday, June 12, 2010 5:57 AM
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I would think if you can get some sort of smoke machine it should work going through the charger just fine. You should be seeing around 10psi with that pulley so yeah somethigns definately up.
ok i got how im going to do it. i am going to get a air hose fitting that is 3/8 npt take out my camaro iat sensor put air throught there. now my question is do i use my boost gauge inside the car to read the psi or do i have to hook up a gauge somehow . and i amgonna get a closed coupler for the throttle body with clamp on it.....
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Umm you usually just throw a coupler on the throttle body and hook up some shop air pressure at 5-10 psi... You don't use a boost gauge to read it... you're just listening for leaks....
2001 Olds Alero (LD9)
650 whp / 543 ft-lb
@turboalero
ok that works for me got told to use soapy water on all the joints and gasket areas. i was thinking it would just be easiest to block off the tb with coupler and just get a fitting for where that sensor is . rather then getting a whole bunch of couplers clams and pcs fitting as i have seen other people do...
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You are running a completely different set-up than the rest of us with the M62. A roots style blower compresses the air inside the intake manifold, not inside the S/C. You have alot more room for the same about of air than we do and the blower can only move a fixed amount of air. You need to move more air to reach 10psi in a 10 gallon tank than in a 5 gallon tank and the S/C cannot move the extra air.
Short answer "It's normal". If you want to hit 12-15psi, get the Harrop.
im not worried about how much psi im seeing. i just dont think seeing 4.5 is correct when everyone else reads 10 to 12 on this pulley granted i know i have a bigger displacement engine, my charger is ported, head is ported,and im running through a intercooler now,i know these all have a factor in drop of reading psi on a gauge. andi know it doesnt mean im not making power. i just dont think a 6psi drop would come from these things it could be. i just want to rule out a boost leak.if i make small psi then i am fine with that i just wanna know im not loosing it in the piping or anywhere.
Edited 1 time(s). Last edited Saturday, June 12, 2010 5:59 AM
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jared methe wrote:im not worried about how much psi im seeing. i just dont think seeing 4.5 is correct when everyone else reads 10 to 12 on this pulley granted i know i have a bigger displacement engine, my charger is ported, head is ported,and im running through a intercooler now,i know these all have a factor in drop of reading psi on a gauge. andi know it doesnt mean im not making power. i just dont think a 6psi drop would come from these things it could be. i just want to rule out a boost leak.if i make small psi then i am fine with that i just wanna know im not loosing it in the piping or anywhere.
what tinkles said just explains why you would be seeing a smaller psi.
you are trying to push 10-12 psi normally in a very small area in the ecotec intake manifold. where you are trying to push 10-12 psi in what is a very large volume intercooler, piping and intake manifold.
think of it this way too. if 2 people are running the hahn turbo kit but one has a bigger intercooler. who's going to see higher psi? the one w/ the smaller intercooler because the turbo is filling a smaller volume.
my carDomain updated 6/11/10 Forged and Supercharged
I didnt know ppl where doing this, as I don't come around here much anymore.... However, for what its worth, I have a 2.4 ecotec cobalt with the m62 and I see 10 psi on the 3.0. Have you checked your bypass valve?
Matt the op is using an air to air intercooler on his ld9, not a liquid to air like 99% of use running the m62. I'm going to agree that since you have dam near everything ported you will see a drop in psi, I only got 10psi on my 3.0 with full exhaust and LS1 tb. One thing that does come to mind is crank pulley size on an ld9 or quad when compared to the eco if it is slightly smaller it will not spin the blower as fast and that could also effect your boost output.
When the first kit was being made it didnt show any boost loss because of the intercooler and piping. I think he was seeing 8-10 psi.
JUCNBST wrote:Matt the op is using an air to air intercooler on his ld9, not a liquid to air like 99% of use running the m62. I'm going to agree that since you have dam near everything ported you will see a drop in psi, I only got 10psi on my 3.0 with full exhaust and LS1 tb. One thing that does come to mind is crank pulley size on an ld9 or quad when compared to the eco if it is slightly smaller it will not spin the blower as fast and that could also effect your boost output.
Quote:
think of it this way too. if 2 people are running the hahn turbo kit but one has a bigger intercooler. who's going to see higher psi? the one w/ the smaller intercooler because the turbo is filling a smaller volume.
i understand how psi will drop in a bigger volume intercooler i understand the concept of all of that.but compared to the same manifold and similar build seeing qlmost 10 psi different i dont understand that. thats why my only question on this thread was to see what would be the best method for doiing a boost leak test.which i figured out how i am going to do it and i will be doing it in a minute.
who is matt? and i am almost positive eco and ld9 cranks are the same diamater. so that isnt a problem.
Quote:
When the first kit was being made it didnt show any boost loss because of the intercooler and piping. I think he was seeing 8-10 psi.
i just got off the phone with wade who had the first kit... wade and i both had almost identicle builds. ported head,intercooler,both had a header,secret cams,the only thing i have is a ported charger so yeah i can see a lil drop in psi because of that. but he had the 2.9 pulley on and was seeing 14 psi same builds,so i dont think a 2.9 pulley over a 3.1 creates 9 more pounds of boost!i only saw 4.5. so wether it be something with the bypass valve or a boost leak i think it is something not quite right.
have any tips on how to see if the bypass is working correctly? when i rev the engine i can see the bypass moving so i know it functioning just not sure if it is sealing all the way?
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I thought stegiemer recalibrates the bypass when they port/rebuild blowers? or do you have to pay for that......I never looked into how to adjust them though so i can't offer any input on that.
okk so i did the leak test found a leak between the throttle body and adapter plate which would explain a lil bit of my high and low idle.and just for sure measure i tightened up all the manifold bolts.... got the intake on and went out for a quick drive..still have the 3.1 saw 6.5 psi that seems much more reasonable then 4.5 and it felt a lil stronger and the wideband started to lean up a lil bit went from 9.8 to 10.5 .. so if there was a boost leak i dont know but i went over everything and tightened it all up.. im going to be very happy with this setup... it pulls strong. and just to state ahead of time i dont have hpt so im not tuning it for the afr i just wanted to get it driveable because i am gonna be driving it to fred simmons (aka smg motoring) to dyno and tune.
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i only see 8 psi with the 2.9 and os crank
same set up think i have a leak though as well idles kinda funny for 5 seconds or so and then its fine
MP-62 Intercooled 2.9" Pulley
Tyler Wichers wrote:i only see 8 psi with the 2.9 and os crank
same set up think i have a leak though as well idles kinda funny for 5 seconds or so and then its fine
for those that dont know tyler bought wades setup.. so he has the same setup also now.
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well kinda thought about this can a Throttle body change boost wade used a 56mm, im usin a 62mm and you have a bigger 1 i believe
kinda think less air flow = more psi
or am i way wrong lol
MP-62 Intercooled 2.9" Pulley
well all that trouble and i figured it out when i was looking at everyone elses pictures..... i had the lower port oon the bypass valve capped of just went for a quicj spin and oh yeah car is gonna be hella fun..... but now im running a little lean so cant play as much now......
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Boost drop in an intercooler should not be more than a couple PSI. Now I have no idea how much tubing they are runnign along with how much volume the manifold is, but a 3.1 pulley on a m62 should see around 12-13psi on a lsj. Now since your only seeing 4.5psi and its running rich i am going to suspect that you either have a vacuum leak between the manifold/supercharger, a coupler on the interooler pipe or another fitting somewhere else. if you cant find the leak I would suggest making two plates that cover the manifold completely and seeing if you can add psi to the manifold and see if it will hold. Thats where I would start. Also on the interooler piping, if you don't have beads on them they will blow off fairly fast. You just need to do some investigating. its a very custom set-up so dont think it will work 100% the first time, your gonna have to make tweaks.
Just my thoughts take it or leave it.
Mark-OEM
http://www.overkillengineeringmotorsports.com/
check by the boost gauge fitting i had 1 there and i was losing 3lbs of boost
JBO since July 30, 2001
p.s i forgot to mention on my last post that i am seeing 7 to 9 psi so that seems correct on the 3,1 pulley and my engine.....just having that bypass port closed wasnt letting it seal closed and i wasnt actually running boost hence why it was running rich also.the afr came back in the 11 s so i can romp on it and it is dang quick.. all problems are fixed so no more suggestions needed. i believe.... thanks alot for everyones help and ideas...
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