Bad boost problems. HELP!

[JayLo]

Ok, so I've replaced the plugs (NGK UR5s), wires (ATR Black Beauties), cap and rotor and added a 160? stat. The truck runs much better now, though it still idles very slow.

I checked my IC pump only to find that the original Bosch unit had seized, so I ordered one from Detroit turbo. I also ditched the kink-bend metal lines with ?? heater hose.

Here?s my problem: I HAVE NO FRIGGIN? BOOST!!@!

Well, it does make boost, just not an appreciable amount. With a normal street start (no brake boosting, just punching it), I get 0psi through first, 2-3psi through second, and maybe 5-7psi by the top of third. My buddy?s ?99 5-speed Mustang GT put a good bus or two on me the other night up to 80mph or so. I stomp all over him in my Dodge Spirit.

I tried disconnecting the boost solenoid (the electrical connection above the compressor housing). I have no cat either. Shouldn?t I be boost spiking like mad? I don't hear any vacuum leaks.

Could the preload on my wastegate actuator be set to low? If so, how the heck do I adjust it? There doesn't seem to be any room to get my hands at it.

Please, somebody help. This truck is a turd.

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[sy538]

Re: Bad boost problems. HELP!

Very odd that you have no cat and low boost. Is it a stock turbo? Maybe the previous owner did something to prevent overboosting. You should check out datamaster. A scantool might not help you with this problem but you need one anyway if you don’t have one already.

Yeah you should kill a ’99 mustang GT, I don’t know what they run, but I’m sure its not mid 13s. Just so you know what these trucks should do, I ran 13.6@ 98 with a hotwired Johnson IC pump with 3/4” lines, no cat back, no jack and no spare.


PPI Typhoon was making cables for ~$50, not sure if he started making them again or not.
http://www.syty.net/forums/showthread.php?t=27662
http://www.detroitturbo.com/
http://www.akmcables.com/index.htm
http://www.ttspowersystems.com/index.htm <-- almost everyone here uses this
http://www.supportfitness.com/mark/tunerpro/ <-- a few people use this
http://www.turbo-link.com/
http://www.andywhittaker.com/ecu/screen_shots.htm

 

[Will_in_China]

Re: Bad boost problems. HELP!

With that low of boost and no cat, It could simply be a spent stock turbo as well.
Either way, you can get access to the WG rod better pulling the fender-well.

You do need to get a scantool on that thing.

If your truck gets running right, your Spirit would get pwned.
Well mine would've anyways, I had it and the Sy at the same time and ran 'em heads-up. (and an Omni and other turbododge shit)
Quick, no doubt but my last Truck (Typhoon even) went 12.80 with chip and exhaust.

 

[Will_in_China]

Re: Bad boost problems. HELP!

Also, have you made sure your vacuum lines don't suck?

 

[midnightbluS10]

Re: Bad boost problems. HELP!

Are you using the stock boost gauge?

 

[JayLo]

Re: Bad boost problems. HELP!

Very odd that you have no cat and low boost. Is it a stock turbo? Maybe the previous owner did something to prevent overboosting. You should check out datamaster. A scantool might not help you with this problem but you need one anyway if you don?t have one already.

Yeah you should kill a ?99 mustang GT, I don?t know what they run, but I?m sure its not mid 13s. Just so you know what these trucks should do, I ran 13.6@ 98 with a hotwired Johnson IC pump with 3/4? lines, no cat back, no jack and no spare.

The turbo is stock.

I?m fairly certain that the previous owner was car/truck illiterate. The thing was bone stock when I got it, right down to the AC Delco plugs/wires, and seized Bosch IC pump.

I have now added a high flow IC pump, replaced the metal IC lines with hose and wired the pump for continuous operation.

Stock GTs run 13.9-14.1 with a pro driver. My buddy has done a 14.1 in an essentially stock stang (save a K&N drop in filter). Obviously my truck is no 13.6@98 in this shape. It feels like a solid 15 second truck right now.

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[JayLo]

Re: Bad boost problems. HELP!

With that low of boost and no cat, It could simply be a spent stock turbo as well.

Either way, you can get access to the WG rod better pulling the fender-well.

You do need to get a scantool on that thing.

If your truck gets running right, your Spirit would get pwned.

Well mine would've anyways, I had it and the Sy at the same time and ran 'em heads-up. (and an Omni and other turbododge shit)

Quick, no doubt but my last Truck (Typhoon even) went 12.80 with chip and exhaust.

I was wondering what kind of shape the turbo is in. If it were truly shot, wouldn?t it be essentially boost-less? I suppose I could pull the suction side hose and see how easily it spins or if it has a ton of shaft play.

According the stock gauge (not very reliable from what I?ve heard), with the factory boost controller hooked up, it will blip up to 10psi for a second and then settle back to between 5 and 0psi. Even at 10psi, the t3/t04e hybrid on my Spirit R/T pulled a lot harder than this sucker.

I ordered a datamaster last night. When it comes in, I?m sure I?ll be bugging you guys with more questions. Anything in particular I should look for with the datamaster?
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[JayLo]

Re: Bad boost problems. HELP!

Also, have you made sure your vacuum lines don't suck?

I'll do that tonight.
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[JayLo]

Re: Bad boost problems. HELP!

Are you using the stock boost gauge?

Unfortunately, yes.

No one in town stocks anything other than Autometer.

I made the mistake of buying a pyrometer and two boost gauges from them, all very inaccurate as proven by higher quality test equipment at the local dynoshop.

I still have the 20psi gauge that I think reads within +/- 2psi. Maybe I?ll temporarily hook it up just to check the stock gauge.
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[MAITAI1993]

Re: Bad boost problems. HELP!

Check your boost silinoid above your turbo and all vac lines that go down to wastgate I have a new one im not going to use because i put in a boost valve $15.00 plus shipping..let me know..

 

[JayLo]

Re: Bad boost problems. HELP!

Check your boost silinoid above your turbo and all vac lines that go down to wastgate I have a new one im not going to use because i put in a boost valve $15.00 plus shipping..let me know..

Could a weak solenoid be the problem? Boost spikes to 7psi for a second or two with no power connected to the solenoid. I'll replace the vacuum lines tonight. If that doesn't fix it, I think I'll take you up on your offer. Thanks.
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[Anthony]

Re: Bad boost problems. HELP!

Could a weak solenoid be the problem? Boost spikes to 7psi for a second or two with no power connected to the solenoid. I'll replace the vacuum lines tonight. If that doesn't fix it, I think I'll take you up on your offer. Thanks.

I had a very large leak in the underside of my IC to TB connection that was limiting my boost. It would blow open over 5 psi just enough to bleed off boost. The bike tube test made the leak pretty obvious.

 

[JayLo]

Re: Bad boost problems. HELP!

Well, I removed the stock air snorkel to get my hands at the vacuum lines by the WGA. I gently pulled the rubber elbow off the wastegate solenoid and it just disintegrated. They were all fubar. Two small vacuum hoses later and I am boosting past 10psi.

How soon should a factory turbo hit full (stock) boost? It will creep past 10psi (according to the factory gauge) at the top of second and third. It only makes 5-7psi in first with a normal launch. Aside from not hitting 15psi, does this sound normal?

Also, I was dismayed to find out that this 48k mile original turbo seems to have lots of shaft play. Even with a mechanic?s glove on, I could feel it wiggling side to side in axial and radial manners. I doubt a stock turbo in new condition is supposed to have such loose bearing clearances. Your thoughts?

Maybe sloppy bearings causing excessive drag are keeping me from boost spiking badly as I should without a cat.
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[dgoodhue]

Re: Bad boost problems. HELP!

BTW Black lettering doesn't show up for half of us using the Syclone background (vs the 92 Ty background).

 

[JayLo]

Re: Bad boost problems. HELP!

Does this show up? Cool, I guess I'll have to stop spell checking and pasting from MS Word. Well, my boost problems reverted to the way they were just a few minutes ago, and now I have an awful stump right off idle. The more I lay into it from a stop, the worse it stumbles. What gives? :banghead:
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[sy538]

Re: Bad boost problems. HELP!

How soon should a factory turbo hit full (stock) boost?

According to datamaster I get between 11 and 15 psi before it shifts into 2nd. I guess it depends on the weather because looking back at the files it wasn’t as consistent as I expected.