Hey guys.
I'm currently in the middle of tuning and while doing a 3rd gear pull, I noticed some ridiculous lag on my setup; 5psi at 5k and 16psi by 6k . Prior to the build, I hit 31psi at 5k on stock block.
There's no boost leaks, I've checked and checked the boost lines routing between the turbo, my mbc, and my wastegate and it's right. Inspected and tested the wastegate, changed the springs, the diaphragm is in good shape, no tears. The valve seals installed.
I deleted my EGR system so there's not many vac lines to misroute.
The two nipple on my TB are routed to my Hobb switch and my boost gauge. For the two middle nipples on my IM, I have one capped and one routed to my bov and the bottom left nipple goes to my fpr. Pictures attached.
Checked compression on the motor and it's healthy, 190 across the board.
I'm honestly out of ideas guys. Any help would be much appreciated.
Thanx guys.

 

are you now on a 6766? might be normal for snail that big.

 

No, I'm on the FS635 right now. Related to the 6262 and 35r. I think even the 6766 would hit 30 before 6k on a 2.4L.

 

IF...

- All plumbing is routed correctly

- There are no pressure leaks

- There is nothing causing the WG to open prematurely

- There is nothing wrong with the turbo

... the most logical explanation is the tuning.

 

Is the engine physically timed correctly? I know with the 2.4 you either need to set timing off half a tooth or run adjustable cam gears.

 

TScomp is tuning the car, so I would think the tune is spot on. I'll check for shaft on the turbo again. When I last checked, there was minimal up and down movement and no in and out.
As far as timing I don't have adjustable cam gears, I'm on the stockers so I retarded it half a tooth. Can the timing be that off on the stockers without the valve smack?

 

The timing can be off enough to create significant power issues without not causing valve contact. The taller block requires additional attention where correct cam timing is concerned. Look into this and be absolutely certain what you have is correct, otherwise, you are chasing your tail.

 

yeah, you cant correct timing with stock gears when using 2.4 block. 2.5 degrees correction is needed. moving one tooth is 7.5. you cant move belt by "half tooth" . that fraze comes from adjusting belt one tooth on one gear but not the other.

 

Time everything up, then make the crank one tooth off, and since the cams move half what the crank does, the cams are 1/2 tooth off. When the crank is at TDC.

 

Hmm, why go for six when you can get a half-dozen, right?

 

Thanks guys, i'll order some adj cam gears to be certain. I'll report back when i have some news.

 

interesting theory but . moving crank one tooth moves the cams gears one tooth as well. they are connected by a solid no slip belt. one tooth on cam gears is 7.5 degrees. one tooth on crank is 15 degrees. so the timing here is either 5 degrees retarded or 5 degrees advanced at the gears. since the turbo is spooling slow I would guess the timing is 5 retarded.

 

You sure you don't have any exhaust manifold leaks? Cracks on the manifold or housing? Was the turbo new, and if not have you taken the housing off to inspect the condition of the turbine wheel? Did you do anything to the rest of the turbo-back exhaust that might have caused a flow restriction?

 

Just installed the adj cams gears, degree'd them 3.75 retarded and still have the same problem. 94AWDcoupe, all the threads i've read say degree them this way. Why do you say 2.5? I may try this next.

 

I've looked over the manifold several times, i dont notice any cracks. Everything in my exhaust is the same besides my downpipe being welded to my outlet. I'll take a second look at that as well.