Why so much turbo lag?

[DeNoZZo]

I went to the drag strip again tonight hoping to finally do better than 16.4 at 84 (last years time)... My first (and best), was 15.9 at 86. . I noticed that I wasn't hitting full boost (12lbs) until almost 5k rpms. Once it hit, it felt like it pulled, but it seemed like it ran out of steam pretty quick. The turbo is a tdo4hl which I think is a 13g... But i never did identify it completely. This definatly doesn't seem right. One thing I should mention is that my bov has a broken nipple, I rtv'ed the plastic tube back on and thats worked for a while. I also noticed when I when I took the bov off the other week that I could blow in the lower part of it and I could hear air leaking. I have a new 1g bov on order, but could that have been my spooling problem?

Ideas?

 

[toofast82]

do you have any pics of the turbo?
I would start with the boost leak test
Any pre-turbo exhaust leaks?

 

[PIMking]

Dude you should of hit me up I have a couple of 1g BOV's Laying around. Cedar Falls?

Also how was the turn out?

 

[LongJonSilver]

definatly do a boost leak test....a lot of air is probbly escaping from the bov

 

[DeNoZZo]

Dude you should of hit me up I have a couple of 1g BOV's Laying around. Cedar Falls?

Also how was the turn out?

Fuuuuuu.... I already spent 100 on a new one. Oh well.

Yea there were a pretty good amount of street cars there for it just being a friday fun night. Maybe 20-25 street cars if I had to guess.

 

[DeNoZZo]

do you have any pics of the turbo?
I would start with the boost leak test
Any pre-turbo exhaust leaks?

You must be logged in to view this image or video.

 

[1sttimedsmr]

By the way I see It, It looks pretty dirty It seems like you have an oil leak somewhere. And I suggest you to switch to a 14b turbo. They are a little bigger and spool really fast , on mine i can get to 15lbs in no time at all. And they are super cheap. Just make sure It doesn't have any shaft play, if It does , just make sure to rebuild It.

 

[91tizzy]

Yes sir that is a beloved 13g
The "hl" came on factory 3000gt turbo models and stealth platforms.
I had one on my car that the previous owner had sourced out for a stock replacement. I put that bi*** through hell (23 psi on occasion) and its as tight as ####y.
I still have it laying around actually. I need to sell it. Or clean it up and use as some sort of decoration.

 

[Bluefire16]

Does your wastegate look damaged? I had a problem similar...and man clean up the engine, i dont wanna see what the rest of the engine looks like just from seeing the turbo...

 

[BoostFrenzy]

Does your wastegate look damaged? I had a problem similar...

Definantly something to check on. If you can't find any trace of a pre turbo exhaust leak then this may be it. It will either be the: head-manifold studs or nuts are loose, head-manifold gasket it bad, the manifold-turbo gasket, or loose turbo bolts. Worst case senarios are that you have a cracked manifold, a bowed manifold from being through so many heat cycles, or a cracked turbine housing.

Much luck in figuring it out.

 

[lou schmouder]

i had the same problem it i installed a 3" exhaust know i hitting it at around 3500

 

[DeNoZZo]

Don't worry guys, it's a lot cleaner now... That pic is from like 2 weeks after I got the car. I'm thinking it might be the exhaust manifold, and I do have a broken manifold to turbo bolt so only three are holding it on. There are no oil leaks that I know of, it's just dirty from never being cleaned.

 

[97gst_spyder]

It sound like the missing the bolt is the issue.

 

[MichaelSuch]

Do a BLT, sounds like you have a major leak.

 

[DeNoZZo]

Does your wastegate look damaged? I had a problem similar...and man clean up the engine, i dont wanna see what the rest of the engine looks like just from seeing the turbo...

The wastegate hose is connected to my lower intercooler pipe

 

[BoostFrenzy]

The wastegate hose is connected to my lower intercooler pipe

They mean as in the actuator arm or the flapper door. If either are damaged, then the door won't close all the way causing a preturbo exhaust leak. Checking the door will mean you will probably have to take off the o2 housing.

 

[Bluefire16]

Thats partly what i ment, if u managed to hit ## actuator with anything and dent it or crush it, it can do this.... i no mine did. When i bought my 14b the actuator was crushed kinda. I went to step on it and it just wouldnt go....new wastegate and BOOM. Problem fixed.