As some of you know I recently finished my megasquirt and turbo build, but im running in to a scary wall. I have very power. The car starts and idles fine, but under proper fueling conditions I still have to really get on it to make any sort of power.

Breaking it down I am positve it is a lack of air. the concearn Im having is from where

I had a pretty shoty weld job but no major leaks. the only real leak was from the compressor housing. it's the hole where the line for the waste gate goes. It fits an 1/8 inch hole so it really shouldnt be my problem. but I spent today pecieing all of the fiitings together to hook up the waste gate properly. I havent tested it yet

option two is a bit more scary. Cam timing. when we put the new head on we came across the realaszation that the chain can actually be put on backwards. the colored links have to be facing a certain way, but with my older chain I could barley see the links. so we ended up puting it on backwards. the two cam links were good. but the crank link was 180 out. so we had to basiclly had to eye it up. this wasnt a big deal seeing as how it was the exact oppisite tooth.

but what makes me think my timing is good is the regular operation. no codes, strong idle, very little missing, and it reves good.


???


So my question is, is it possiable that the open hole was enough to rob my power.


"Kick azz is my boost hero!!! "

Its possible. Do you have a boost/vacuum gauge hooked to it?
What is it showing when you experience this lack of power?
Run some datalogs with your MS and check out what the map sensor is reading, and A/F ratios when you experience this problem.
Datalogs will be your biggest friend with MS.

I have a mechanical and a boost guage sensor using the MS map sensor. both read the same, Im showing very little air flow up into the rpm band. like 4 before any where near 0

what sucks is that could be a leak or out of time valve events


"Kick azz is my boost hero!!! "

def. doesn't sound like cam timing, that would cause problems all over

Sounds like you have a couple that is not tight enough/leaking or a leak at the TB



LE61T PTE6262 Powered

Nothing I'm reading makes any sense here.
Are you saying that:
- the car is turbo
- the turbo sounds like its spooling
- the car drives but lacks any power
- A boost gauge that is tapped into the manifold, same as the MAP sensor, only reads up to -4 in.hg. at WOT. Not zero, not positive 4.
- the wastegate was not hooked up during initial testing
- ^ that made no difference to the issue after it was hooked up
- the timing chain is installed upside down

No the fitting at the outlet should not be big enough to cause a major drop in boost.
If the car cannot get to 0psi or above there is something restricting the intake. does the gauge go to zero when the engine is off?
If the chain was put on upside down, how did you determine it was timed correctly or what did you shoot for? A normal chain would be spaced something like:
EXcam -10 links- INcam - 50 links - CRANK - 60links -back to EXcam
If its on upside down and you still aligned the links using a mirror or such, the timing would definitely be off.

sig not found

I haven tested it yet with the compressor sealed up.

the turbo is whsitleing the hell away. but I cant get it to go above 2 psi.

it just feels weak. It feels like it just isnt breathing.

I Reran the pipe from the turbo to the TB, this should allow me to elimante restriction problem.

If its still doing it after this, Im in trouble...


"Kick azz is my boost hero!!! "

Sounds to me like you have a serious boost leak! And if the waste gate isn't hooked up, that might be where the problem is.

good point. if the wastegate is stuck open it wont produce boost, make sure the vac. lines are correctly attached. And make sure the wastegate is fully functioning. if it's internally gated try and move the swingvalve by hand if it's very easy it may not be assembled properly, or it may not be tightened



LE61T PTE6262 Powered

what engine??? what version of MS??? B&G or MS Extra??? So, your not making any boost? Is the car slower than before the build, when it was N/A, or can you remember accurately?



M90'd Built LGO-15 PSI
http://webstarts.com/quadper4mance

Im gonna go with guessing your timing is probably off a tooth, The car will run and idle and everything being off timing however it will have a very serious feel of power loss when you need it. We have had a few cars come through with the same problem when the timing jumps a tooth. if you need an OEM guide to how to properly time your engine email me and ill send it over to you so it eliminates any guess work. vulcan.turbo@hotmail.com

Vulcan Turbo, LLC wrote:Im gonna go with guessing your timing is probably off a tooth, The car will run and idle and everything being off timing however it will have a very serious feel of power loss when you need it. We have had a few cars come through with the same problem when the timing jumps a tooth. if you need an OEM guide to how to properly time your engine email me and ill send it over to you so it eliminates any guess work. vulcan.turbo@hotmail.com

you've looked past the most important symptom. He has his whole turbo kit up and not producing PSI which would/should be a clear indicator that soemthing with his wastegate/couplers is wrong...



LE61T PTE6262 Powered

This also is a symptom of a mis-timed engine.... The engine is not producing a full combustion so therefore its not producing the full amount of exhaust which it should be, Ive seen a similar situation numerous times.

Except for the part where he says he can hear the turbo whistling away! I would still look for a boost leak somewhere first before i go as far as looking at the timing. Especially when he admits the wastegate isn't hooked up.

Well i believe if its staying at 4in/hg at WOT its more than just a boost leak, regardless of the turbo being plumbed correctly it should be at least at 0in/hg at WOT position

Jcavi wrote:I haven tested it yet with the compressor sealed up.

..what?

you have to speak clearly in order for us to help you
but if I understand you correctly, you don't have a fitting connected to the 1/8 NPT fitting on the compressor housing..?

if so you have a boost leak and this is the cause of all your problems.

Jcavi mine fell flat on it's face when I popped a charge pipe off and the EGT's went through the roof (1800-2000 Degrees) I would check all my hoses and seal up that hole in the compressor housing. lowes sells little brass pipe fitting plugs for like a buck that willl seal up the 1/8 NPT hole that is there.


2.2 L Ecotec, P&P Head, Stage 3 Comp Cams, Supertech 76 lb Spring kit, Supertech Oversized Valves, Wiseco 8.9:1 CR Pistons, Eagle H-Beam Rods, Home-Built Turbo Kit T3/T4 57 Trim Intercooled, 78 lb/hr Racetronix Hi-Z injectors, Aeromotive FPR, Racetronix f body fuel pump,MEGASQUIRT MS3 + MS3X Finally street tuned on 21 lbs! Now if only I could get it to hook....

last sunday I connected the turbo striahgt to the throttle body s, I could vissually inspect every inch of the pipe work. I also connected the compressor to the waste gate with some brass fittings and a spare vac hose.

Good start, good idle good warmup... no power..? I littery feel like Im driving a volvo wagon. I Dont see full vac until about 3 grand and then under heavy load I can get 2 psi at 4 grand. theres just nothing there turbo spools but theres nothing.

From what I can see is that 1 of two things is happing.

I either have some phantom leak that I cant see ethier in the manifold or on the turbo. Or the motor isnt breathing right. If thats the case I have to retime the motor . What doesnt make sense is that Im not showing any symptons of bad timing. the motor starts and idles fine, it warms properly and it sounds right. there is a cervice code, but half the car isnt connected so that throws that out. really the only thing that even suggest bad timing is the lack of powe? ...... Im literally lost..


and to boot the transmisson is shifting like @!#$.


"Kick azz is my boost hero!!! "

this really doesn't help at all but I have a question. You said the chain goes on a certain way... are the links colored on both sides? I can't see them painting the back of links as well as the front unless he dirrection didn't matter, if it did matter there should only be paint on the outwards side of the link..... well thast what common sence would tell you anyway LOL

yeah just did my chain they make it basically idiot proof. top dead center and line up all the marks


*2012 mazdaspeed3*

the chain was worn to where I could only see the color on the inside of the chain.


"Kick azz is my boost hero!!! "

How much vacuum are you seeing at idle? What code(s) is it throwing?



Quoth the Raven 'Nevermore
raven@accesswave.ca
Raven Autosports
55 McQuade Lake Cres,
Halifax, Nova Scotia, Canada
(902) 850-3330
10.82@132

check your wastegate actuator. i had the exact same problem i was going and it wasnt making boost. it wouldnt read 0 until 3500-4k rpm i had no idea what it could be. what you can do to check it is remove the linkage from the actuator to the wastegate let it sit freely shut. NOW WARNING you cannot punch it or try and get into it . with no actuator your turbo will spike as high as it possibly can. but if you slowly get into it verly little at a time and see that its starting to make boost thats your problem. thats exactly what my prob was. good luck and let us know what you find out


PJ

Im throwing no DTC's and im seeing about 15 lbs of vacum at idle. which looks like a cam issue.

as for the wastegate theres no linkage to remove it's all integral, Im going to take the turbo off tommorw and see if I can find anything.


"Kick azz is my boost hero!!! "