SO Lost.....

[GNJeremy]

OK, I just had a new TA49 turbo, V4, and 009's put on my car.

Now I am having all sorts of problems. Off the line it has absolutely nothing all the way through first gear. It gets maybe 7psi, and thats it. In second, it creeps up to about 10, and in third, it shoots up to 22-25 psi and runs fine.

fuel pressure is set at 47psi line off. The scanmaster shows like 870s in first and second, gradually dropping off to 790s by third, and around 90-100 I start to see 2-3 knock. (i let off here)

Here is a list off my mods:
TA49 w/ ported elbow, and 1.25" wastegate hole
V4
009's
Hooker exhaust (yes the headers too)
AFPR
caspers ultrachip burned for my combo
poston's 3" DP
adj wastegate
no cat
new O2
New valve springs
K&N 9" filter
lots of little things

I run 116 leaded

 

[Quick6'n'-K.C.]

TA49 w/ ported elbow, and 1.25" wastegate hole

WASTEGATE HOLE IS TOO LARGE AND PUCK NOT SEATING CORRECTLY

did you actually port the hole to 1.25 with a 1.25 puck??

the only elbow with a larger puck than the 1.25 is the ATR terryhouston style with a 1.50 puck--

hope this help you out some

 

[UNGN]

Turn the Fuel pressure down to 43 and boost down to 20 for starters, then pull off the elbow and make sure the puck is sealing. If the carbon pattern doesn't tell you, put grease on the puck, bolt it in place, unbolt it and then check. The hole should be no closer to the edge than 1/16".

 

[GNJeremy]

Ok, I'm going to go for some more test runs later this afternoon. I'll turn the FP down, and check the wastegate puck.

When I ordered my turbo from ATR, I didn't expect it to come with an elbow on it, but it did and it was ported, and it said 1.25" wastegate on the box. I ported my own elbow and was planning to use that, but I decided to use what came with the turbo. I know larger pucks are supposed to help reduce boost creep.

Thanks for the tips guys, I'll follow up on them.

 

[OneQuikV6]

Aside from the puck issue, your obviously too fat (rich) down low. As they said, try turning the boost down and lowering FP to low 40's and see where your o2 numbers are down low.

HTH

 

[Quick6'n'-K.C.]

Now I am having all sorts of problems. Off the line it has absolutely nothing all the way through first gear. It gets maybe 7psi, and thats it. In second, it creeps up to about 10, and in third, it shoots up to 22-25 psi and runs fine.

even with 50 psi of line off fuel pressure, your not going to be flooding the car enough to where the boost wont come up-
AND its not a wastegate tension problem cause the boost DOES rise up to 22-25 psi-
either you have a huge exhaust leak,.... or a intercooler hose leak, or the wastegate puck hole is not getting sealed correctly-
HTH
BRYAN WANNER

 

[GNJeremy]

Didn't get a chance to do anything yet, got sidetracked with the family, but I've got my checklist ready to go for sunday. I'll keep everyone informed. Thanks for the tips so far guys, It helps to have somewhere to start.

 

[GNJeremy]

OK, I got a chance to do some more experimentation. Here's what I got.
I checked the puck arm, and it did stick and not want to open all the way, after a little bit of jiggling, I got it to swing freely open and closed. I put a little lubericant on the bushing just to make sure. I then adjusted the wastegate down so there was barely any tension on the puck at all. I checked for hose leaks, and didn't find anything that looked suspicious (They are all new hoses and clamps too) I also put the fual pressure down to 44lbs line off.
So I took it out for a test, and with my chip set on the stock ecm setting, I punched it from about 40. It quickly spooled up to about 17lbs, and held it perfect until I let off around 110. I thought it was odd that the boost would be so high, though. Then I punched it from a 10mph roll, and it just dogged it all the way through first, it barely got more than 5 psi, and the first part of second. The scanmaster showed like 890s for O2 readings in first, and then went down to like 780s in third and fourth. No knock whatsoever.

On setting number 7 on my ultrachip, which ups the boost to around 18-19psi and 26* timing, the car ran far worse. Way high O2's all the way through first and second, 7-8psi. By third it would shoot up to 23 psi, and hold it untill it shifted to 4th, when it would drop quickly back down to 5psi! Arrgh! No knock whatsoever on the scanmaster, and engine sounded fine, too. Also once when taking off from a 5mph roll, the was a little hesitation and a slight pop before the car got going, like a small backfire almost.

I did notice that the TPS was at 4.62 at WOT it should be 4.90, right?
the BL was at 132 at WOT (Stock chip setting)

Maybe the wastegate puck is still sticking, but only when going down the road? or maybe the chip needs to be reburned? Caspers burned it for my combo, but at the time I had it burned, I specified that I was running a TE44 turbo, and I changed my mind and put on a TA49. Would that make a difference? ANy other ideas?

 

[azgn]

did you check the seal on the WG puck?

if it was sticking shut, you would get lots of boost very quickly...

 

[GNJeremy]

True, I never checked how well it sealed, but if it was sticking shut still, wouldn't it shoot up in first instead of in third? Or maybe not for all I know. I emailed Caspers to ask about the chip, so they may be able to help me.
It's raining right now so I can't do any more testing for a while, so I'm just brainstorming.

 

[JToups386]

Here's something else to look into. There's a metered "Y" in the hose assembly that controls the wastegate (it's gray plastic). It can easily get reversed if you didn't pay attention to the way it was originally hooked up on the two vacuum lines. Having it crossed can completely kill your boost or cause irratic boost behavior. However, since you're getting boost up top, it may be just be a faulty "Y" that the metering inside is only working in certain ranges. You may want to try reversing it, just to test and be sure. Also, as others mentioned, the puck must be able to cover the hole with 1/16" to spare.
As for your fuel pressure question, anything over 4.66 is futile. I believe 4.66 at WOT achieves the maximum amount with the stock ECM. Going above that should not have any effect. Your chip does not know what turbo you have, and there is not enough difference between the two turbos, to justify the chip causing such behavior, unless the chip itself has gone bad. Let us know what you find...