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Location:
Sydney
Registered:
August 2004
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Registered:
May 2002
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Re: Any body with a 4A-GTE?
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Tue, 16 November 2004 21:46
 
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Before 3000rpm I get 20psi on full load and it will hold 20psi all the way to the rpm limiter  I can run more boost but it does not gain me any more peak power.
Turbo = T28 (from a pair on a GTR skyline)
Boost controller = one I made
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Location:
Canberra
Registered:
May 2002
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Re: Any body with a 4A-GTE?
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Tue, 16 November 2004 22:36
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Mines not that responsive 
5psi at 2600 rpm
10psi at 3000 rpm
then builds very quickly from there to 19psi.
Turbo is from an S14 200SX (non ball bearing)
3" dump pipe etc.
Boost controller: Solenoid controlled by the haltech ECU. This is not gated and so does not bring the boost on any quicker than standard really, just allows adjustment of boost level.
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Location:
Sydney
Registered:
August 2004
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Re: Any body with a 4A-GTE?
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Wed, 17 November 2004 02:50
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reason I asked coz I'm only getting 2-3 psi around 2600-3000, using a T28 .6/.64 and a turbo smart "gated" boost tee, so I'm trying to work out is the boost tee stuffed? I've got it brand new couple of days ago... Any other suggestions what could be wrong? 
ke382TG, how can you get 20psi at 3000rpm? That's incredible? 
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Registered:
May 2002
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Re: Any body with a 4A-GTE?
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Wed, 17 November 2004 03:53
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reason I asked coz I'm only getting 2-3 psi around 2600-3000, using a T28 .6/.64 and a turbo smart "gated" boost tee, so I'm trying to work out is the boost tee stuffed? I've got it brand new couple of days ago... Any other suggestions what could be wrong?
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That is a bit odd, because TE72_Turbo is using the same turbo as you, without a gate and his coming on boost much sooner.
Usually the turbo smart gated boost controllers bring on boost pretty quick with a big boost spike to begin with (as the gate is essentially not adjustable). Something mustn't be right somewhere on yours, can't put my finger on it though, especially considering you just replced the boost controller.
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ke382TG, how can you get 20psi at 3000rpm? That's incredible?
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The exhaust housing on my T28 is a 0.48 A/R, my intercooler piping is short and only 2" in diameter, my intercooler is quite thin (ie post turbo my setup has very little volume to pressurise compared to most other setups) the cooler and piping is a legacy from the previous supercharged setup. No doubt a slightly thicker cooler core and some 2.5" piping may gain a little more top-end but I have no doubt I would lose the rapid boost response I currently have too.
I have played around with my boost controller a bit too to get the gate to work just the way I want it to. My low boost setting is not gated and the boost comes on much more gradually.
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Location:
Canberra
Registered:
May 2002
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Location:
Sydney
Registered:
August 2004
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Re: Any body with a 4A-GTE?
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Wed, 17 November 2004 04:11
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hmm.. full boost around 5500-5800rpm @ 15psi...  (without boost controller boost only goes up to 6-7psi)
I'm suspecting the "gated" thingy in the Turbosmart boost controller is stuffed, becoz on dyno when it had a cheap "Powerup thingy" it had around 6psi @ 3000rpm, now I can't decide if the dyno graph was true or not?.
turbo is T28 normal non-ball bearing, still trying to confirm if it's a steel wheel...
ke382TG: my pipings are 2 inch too... but is not getting much boost...
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Location:
Canberra
Registered:
May 2002
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Re: Any body with a 4A-GTE?
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Wed, 17 November 2004 04:16
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Do you have an exhaust leak by any chance? Or restriction in your exhaust perhaps (like a collapsed catalytic converter)??
What car did your turbo come from? If its from a 200SX (SR20), then its definately steel turbine.
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Location:
Sydney
Registered:
August 2004
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Re: Any body with a 4A-GTE?
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Wed, 17 November 2004 04:25
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there was a small hole in the cat converter where a oxygen sensor supposed to sit, but that's been filled, and there doesn't seem to be any other leaks, no ticking noise around the turbo/exhaust manifold, although sometimes there's a bit of exhaust smell when accelerating hard...
When the car was being tuned, the guy told me the exhaust isn't restricting when I asked him was the 2.5" mandrel bent exhaust big enough, so I assume the cat is not collapsed?
I wouldn't really know where the turbo came from, but Garrett said it's definately a T28 (0.6/0.64) but when he was supposed to look up the ID tag for me in the end he forgotten, so I'm still getting that confirmed later..
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Location:
parra
Registered:
June 2003
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Re: Any body with a 4A-GTE?
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Wed, 17 November 2004 08:17
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from what i hear the gtr turbo's have a smaller exhaust housing so that could be why it spools quicker...
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Location:
Sydney
Registered:
August 2004
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Re: Any body with a 4A-GTE?
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Wed, 17 November 2004 09:51
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but 20psi at 3000rpm is still incredible... forget about twin turbo setup, and forget about super charger, @3000rpm there's virtually no lag....
so have anyone worked out if my turbosmart boost tee is a dud yet?
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Location:
parra
Registered:
June 2003
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Re: Any body with a 4A-GTE?
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Wed, 17 November 2004 22:41
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i find 20 psi from a standard gtr t28 a bit hard to believe...
it must have been rebuilt/highflowed or something...
it also might relate to what kind of gze you started with...
i've heard the higher compression gze's spool up a bit quicker...
i know mine doesnt reach 15psi untill 3500rpm.. thats a s14 silvia non ball bearing turbo... and i have a low comp gze...
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Registered:
May 2002
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Re: Any body with a 4A-GTE?
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Wed, 17 November 2004 22:54
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i find 20 psi from a standard gtr t28 a bit hard to believe...
it must have been rebuilt/highflowed or something...
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It has been high flowed (these details are in the members ride section on my car on this forum, I had mentioned this in other threads but didn't bother with this one as it seems to be the same people asking questions in all the threads), it runs a larger compressor wheel, the exhaust wheel and exhaust housing are the standard size.
My ZE is the low compression one.
Quite happy to take any doubters for a drive
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Location:
Sydney
Registered:
August 2004
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Re: Any body with a 4A-GTE?
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Thu, 18 November 2004 01:22
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mine's high flowed too...  so is it obvious it's the boost tee now? Or will something else cause the same problem?
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Location:
Canberra
Registered:
May 2002
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Re: Any body with a 4A-GTE?
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Thu, 18 November 2004 02:41
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What has been changed with the high flow on your turbo 86tt? Have you got any pics?
Can you borrow another boost controller to try on your car to isolate the Turbosmart one as the problem?
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Location:
Sydney
Registered:
August 2004
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Re: Any body with a 4A-GTE?
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Thu, 18 November 2004 14:12
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I think the turbo just been grinded a bit, steel wheel put in...
I'll see if I have time tomorrow to go to the shop where I bought the Turbosmart and asked them to replace another to try... Or should I just get one of those Powerups from the ebay?
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Any body with a 4A-GTE?
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Thu, 18 November 2004 23:04
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I'm not sure that I'd blame the turbosmart thingy just yet, because even with the hose connected straight onto the wastegate, you'd likely be building more boost than that, and the turbosmart thingy can't exactly make the problem any worse. Try running the car up to, say, 4000rpm with the wastegate hose disconnected altogether, keeping a close eye on the gauge to make sure boost doesn't go up to anything unreasonable. I'd be suspecting an exhaust leak, probably around the wastegate (otherwise you'd have to be stone deaf not to hear it!)
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Location:
Sydney
Registered:
August 2004
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Re: Any body with a 4A-GTE?
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Fri, 19 November 2004 03:07
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becoz from memory, when the hose is pulled off, the boost builts up pretty quickly, I'll try again in a minute, to floor it at 2500-3000rpm and see what boost it builds, let u know when I'm back.. thx
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Location:
Sydney
Registered:
August 2004
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Re: Any body with a 4A-GTE?
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Sun, 21 November 2004 06:57
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yeah it was bad news, because with the hose off it's still only boosting 2-3psi at 3000rpm, then I've found a little hole, about 2mm x 2mm on the intercooler, is that enough to make the difference?
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Registered:
February 2003
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Re: Any body with a 4A-GTE?
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Sun, 21 November 2004 07:41
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i say it would be, a small hole can release a fair amount of vaccuum under pressure, so i won't be suprised if it was suffering boost loss
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Location:
Canberra
Registered:
May 2002
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Re: Any body with a 4A-GTE?
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Sun, 21 November 2004 09:12
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Not sure if that could contribute so much as to make much less boost, i've had a 6mm vacuum hose blow off the inlet manifold, but only noticed from the higher idle speed, it still made boost just the same. 2mm is not a very big hole, but you'd wanna fix it either way.
Or its a good excuse for an intercooler upgrade to happen now!
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Location:
wollongong
Registered:
September 2003
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Re: Any body with a 4A-GTE?
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Sun, 21 November 2004 10:16
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how much boost are you guys running in you 4agte's. are the y stockers or been rebuilt. i was looking to run bout 17psi max with my new turbo, as i see it as long as you have the fuel there and the tunings good there should be no probs, but whats safe you guys recon for a stock, un opened gze block? not sure what version it is?, how do i check?
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Location:
cambo
Registered:
May 2002
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Re: Any body with a 4A-GTE?
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Sun, 21 November 2004 10:19
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my bottom end is stock, i run at around 15psi for daily driving, maybe about 18psi in winter.
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Location:
Sydney
Registered:
August 2004
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Re: Any body with a 4A-GTE?
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Sun, 21 November 2004 12:09
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| TE72_Turbo wrote on Sun, 21 November 2004 20:12 |
Not sure if that could contribute so much as to make much less boost, i've had a 6mm vacuum hose blow off the inlet manifold, but only noticed from the higher idle speed, it still made boost just the same. 2mm is not a very big hole, but you'd wanna fix it either way.
Or its a good excuse for an intercooler upgrade to happen now!
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haha... yeah, that's a very good excuse to upgrade my 3 yo pipings and intercooler, but somehow can't find any spare change...
at the moment I've put some body filler in the hole, if the filler gets blown out, I'll get someone to splash some welds onto it...
Will test it out tomorrow after changing the oil & filter, hope that's where my missing boost was from... I've tighten all the clamps at the same time and changed a few into silicon hoses, so finger's crossed
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