Auto launch issues

[91stocker]

Im having a hell of a time trying to build boost on the brakes with my auto. Im pretty much out of ideas. I just cant seem to build any boost on the 14b.

No boost leaks, check, rechecked, and rechecked again.

Had the issue before, had a cracked 1g auto mani. So i replaced it with a ported 2g mani, 6cm housing replaced with ported 7cm, 1g o2 replaced with ported 2g. All new gaskets and bolts from ffwd.

Heat cycled it and re-torqued everything to spec.

Im running pump 93. On the brakes im seeing 11.5 ish afr's, 22* timing, 2700rpm.

It just wont get over the hump. Im building a max of 3psi after about 10 seconds.

Again this is on a 14b with stock converter. Any ideas? Im really at a loss here. It should spool this little 14b no problem.

Converter/trans issues? The car runs great mid range with no usual symptoms of bad converter.

 

[Bud92gsx]

Is the only thing you have as far as ecu related stuff is ostich or jackel? No 5 speed ecu or anything?


Does this system have an option to reset the ecu to 5 speed specs?

On an auto the ecu will retard timing if you brake boost for too long..Screwing up the launch..

You have to be in gear, but I'm not talking to an idiot..Try it in first once and see what happens..

I have been able to see I think around 7-10 psi on a 16g while brake boosting..On your 14b you should have no problem seeing 10+ psi..

 

[91stocker]

Is the only thing you have as far as ecu related stuff is ostich or jackel? No 5 speed ecu or anything?

I replaced the stock auto ecu with an "advertised" 5 spd eprom. So far as i know its a 5spd ecu. Also no timing pulled even after 10 seconds on the stall.

You have to be in gear, but I'm not talking to an idiot..Try it in first once and see what happens..

Tried that, not thinking about the auto ecu problem, but just because. No changes sadly.

 

[Bud92gsx]

If you give me the number on the ecu I can tell you if it's 5speed or not..Ot I can give you the link and you can look it up yourself..

When I switched to the 5 speed ecu I went with 450's and the manual fpr..

When My 5speed ecu took a dump I swapped back in the auto ecu and fuel stuff..

Now..I don't understand why you cannot build boost in gear...On a 14b you should have no problem..

There has to be something were missing here..

 

[91stocker]

There has to be something were missing here..

Yea im hoping there something easy im just over looking.

 

[Bud92gsx]

Ok so lets go over the facts..New manifold, 02 housing, turbine housing, gaskets, bolts..

No known boost leaks..Now do you have a boost leak tester just to make sure?

 

[91stocker]

.

No known boost leaks..Now do you have a boost leak tester just to make sure?

Yep, had no boost leaks before the new parts. Checked twice after the new stuff. Still no leaks.

Has new tb and IM gaskets as well. Everything torqued to spec.

 

[Bud92gsx]

Then WTF is going on then. It's gotta be something stupid, and probably something that has already been addresed, and just overlooked....But for some reason it's causing you to not build boost..

 

[91stocker]

Then WTF is going on then.

Exactly

 

[Bud92gsx]

Kinda makes me want to get a ticket on greyhound and come see this for myself..

I've been thinking about it,, and am really stumped at this point..And I'm not you, I can only imagine..

 

[91stocker]

Haha, yea pretty stumped. I tried rich and lean, low timing and high timing. The 14b is in perfect condition. I dont know what info im leaving out.

 

[Bud92gsx]

Now covering something I did not ask..While driving your getting the right boost correct? This is a just a brake boost, boost issue right?

 

[91stocker]

This is a just a brake boost, boost issue right?

Yep exactly. Its set for 16-17psi right now untill i get the issue taken care of. Boost great, pulls nice midrange, no evident issues.

 

[Bud92gsx]

Then I'm not the only one who is totally confused..Ok good to know..

 

[turboglenn]

Is your wastegate arm maybe letting the flapper be open jsut a slight bit before it comes on with high boost and moves to open the flapper all the way. I could see if it's open just a hair at those low exhaust flow RPm's causing you to not be able to build boost, but hell you should be able to fart through a 14b and make at least a couple psi

 

[Bud92gsx]

I'm actually glad to see someone like glenn like WTF is going on....

 

[doubleclutch99]

How's your base timing look?

 

[91stocker]

Is your wastegate arm maybe letting the flapper be open jsut a slight bit before it comes on with high boost and moves to open the flapper all the way. I could see if it's open just a hair at those low exhaust flow RPm's causing you to not be able to build boost,

Thats possible i guess, i'll look into that. But i do have a couple washers spacing the actuator. With those you'd think it would be clamped down pretty nice.

but hell you should be able to fart through a 14b and make at least a couple psi

Exactly, the fact that its a 14b adds to my confusion.

 

[turboglenn]

The only other thing i've seen cause a 14b to spool horribly was a local "speed shop" ported my friends 2g head for him, well all they did was HOG it out aimlessly with no idea what "flow" is about and velocity is meant for, he wasn't spooling a 14b up to the 20+ range untill after 4500 RPM on an AWD car..

by chance there wasn't some hack job porting your head was there?>

 

[Bud92gsx]

Yeah I ported the head..So at least we know it was some hackjob..


But that is a good question..I'm guessing not, unless his profile is not up to date..

 

[91stocker]

How's your base timing look?

That is something i havent checked since the new parts. I didnt really think about it actually. It starts and idles perfect. Turns off when i turn the key off too haha. But i will check that out tomorrow.

The only other thing i've seen cause a 14b to spool horribly was a local "speed shop" ported my friends 2g head for him, well all they did was HOG it out aimlessly with no idea what "flow" is about and velocity is meant for, he wasn't spooling a 14b up to the 20+ range untill after 4500 RPM on an AWD car..

by chance there wasn't some hack job porting your head was there?>

Nope all stock. I've recently changed the exhaust and intake mani gaskets too. Ports sizes were stock.

The car was 100% stock when i bought it.

 

[doubleclutch99]

The reason i ask is a while back we had an issue with too much base timing. we couldn't get the stall speed up and the turbo to spool past 3 lbs at the track. long story short, we fixed the timing and can now brake boost to about 27 lbs. in 6 or so seconds on a bullseye s259 ett.

 

[91stocker]

The reason i ask is a while back we had an issue with too much base timing. we couldn't get the stall speed up and the turbo to spool past 3 lbs at the track. long story short, we fixed the timing and can now brake boost to about 27 lbs. in 6 or so seconds on a bullseye s259 ett.

Well that is very encouraging.

Looks like a have a few leads to follow now. Thanks everyone.

 

[GDNF2ET]

How about a pic of the engine bay ? Maybe it will give us a clue...
Have you checked your boost controller for debris ? Bypass it and see if things change, keep your eye on your boost gauge though...

 

[91stocker]

How about a pic of the engine bay ? Maybe it will give us a clue...
Have you checked your boost controller for debris ? Bypass it and see if things change, keep your eye on your boost gauge though...

Sure thing, i could take the heat shields off and snap a few pics.

With the mbc, the car boosts fine otherwise. Only on the brakes do i have an issue. Wouldn't a mbc problem be consistent throughout?

After i check those other things listed above, i'll run wg pressure and see if it makes a difference. Side note though, i did try wg pressure before the new exhaust parts and i had the same problem then. Worth a shot still, im willing to try just about anything right now.