Rep Power: 271

hey. well i was wondering. i have like monster turbo lag. its a t3 turbo off a 300zx with a stage 2 wheel. i raced my buddy that i used be pretty even with before my turbo. from the dig he was tailing me throughout my whole 1st and 2nd gear. i beat him of course, but not by much, a mere 2 cars, i expected to take a whooping on him and now he thinks hes all quick n stuff, lol. the turbo doesnt get to full spool @6psi until about a little over 4k rpms. all my friends and the guys at the shop think that that is way too much time for the t3 to spool up. they said it feels like the characteristics of a bigger t3/t4 setup. i have no boost/exhaust leaks and i have the turboxs manual boost controller installed. i dont know if this is relavant information but the kit also has a side mount intercooler. after the turboxs boost controller install i stripped the adjuster screw on the boost controller but luckily i got to get my 6psi goal. also now my car will sometimes creep up to 9-10psi for less than a second then go down back to 6psi, this only happens in 2nd gear. what to do?

i was thinking of getting an ebay boost controller. can i rely on these? any reccomendations? also maybe upgrading to a newer turbo perhaps. the turbo i am running on is pretty old. thanks

 
Rep Power: 350

What are you running for management? If you aren't tuned, you aren't going to make as much power, bottom line. You have to understand that to keep the rpms rising and spooling the turbo, your have to get air in and out of the head as effiiciently as possible....

 
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i am not tuned but i am on the older sf fmu. that should be suffiecient for now wouldnt it? i am waiting to gather funds for emanage/injectors. i knew it wouldnt be all that great without a tune. but i think this is too much

 
Rep Power: 350

Well its a used turbo, also right? No telling what kind of condition its in, either....

 
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Ditch the Turbo XS and invest in a good boost controller to keep that wastegate shut much longer and keep lag down....

 
Rep Power: 280

Do you get a "check engine" light?
I'm thinking the problem is: tune, boost controller or MAP sensor or any combination of these.

 
Rep Power: 271

nope i am running fine on no cels whatsoever using synapse missing link. even prior to the boost controller the turbo still lagged a bit. any reccomendations on a new boost controller? can you tune on an fmu? thanks for all the help guys some mre is appreciated, as i would like to rid of this lag. im looking for a new garret turbo with low spool up times and a nice constant power band throughout the rpms.

i also feel my power band die down before i reach redline.

 
Rep Power: 280

You might have issues with waste gate. The spring might not allow waste gate to open when reaching your 6psi, therefore creating lag, age of the turbocharger assembley may play certain role.

 
Rep Power: 285

Good boost controllers
Hallman
http://www.boostcontroller.com/index...e=1&category=5

Joe P
http://www.joepmbc.com/

 
Rep Power: 280

Your turbo is from Z31 300zx, its got to be about 20 years old now....

 
Rep Power: 271

20 years old are you serious? lol o_O.... how did you find that info out?

 
Rep Power: 280

T3 turbo only came with 1984-1989 300ZX Turbo.

 
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Get the greddy profec b spec 2
You can tune it perfect. Its the best 300 bucks you have ever spent. I had the same problem with the sf act. But the problem was fixed with this boost controller.

 
Rep Power: 271

how did the boost controller have such a huge effect on the spool up time? what kind of tuning on the profec b can be done to help spool up times? and... holy **** my fkin turbo is 20 years old? ima buy a new one off ebay, no name turbo, its probably better than the one i have currently... i was thinkin of a new t3/t4 turbo or a t3 super 60. any other turbo reccomendations for fast spool up times and pretty decent power through the rpm band?

is the profec b an alternative to lets say a emanage?

 
Rep Power: 280

Dont be aftraid of 20 year old turbo. If it works fine - then it is fine. I'm thinking now that your wastegate giving you B.S. - looks like it is malfunctioning.
I dont see how boost controller can help in reducing lag, but I might be wrong because some of the expencive electronic kinds (e.g profec b) have a lot of options.

If you chose to buy new turbocharger, then go with something similar in size, t3 with internal wastegate, this should be good for you to crack 200whp.

Btw, my TSI fuel system let me adjust spool up time from inside the car, either more smooth or more "jumpy".

No, they are set up for different duties

 
Rep Power: 350

Do you have a boost gauge? Is your boost actually falling off?

From what you're saying, it sounds to me like its all in your tune. If you don't have the proper fuel or timing, your engine will not make power. The SF FMU is notorious for running lean. I have a turbo XS manual single stage boost controller. I have no issues building 13+ psi and holding it. I think your first step should be to get a decent fuel system and try to tune the car (you shouldn't even be trying to run boost without doing that anyways.)

 
Rep Power: 271

with my next paycheck what should i get for my turbo set-up? i am only expecting like around 350 bucks. new turbo, fuel management, boost controller, wastegate... what to get.. i was thinking emanage or like safc vafc as i am on a tight budget as you can see.

and yes of course i have a boost gauge. the boost actually dies off like it would maybe be boosting strongly at around 6-7 psi then it would go down to maybe 5 and go back and forth from 5-7. the turbo also randomly spikes up to 9-10 psi for less than a second. is this a dangerous situation or will i be fine like this? the spikes happened after i installed the boost controller.

 
Rep Power: 280

Boost spike are dangerous. You can get melted pistons or hole in a block for it, or blown headgasket, if yor're lucky.
I'd invest some into a fuel managment system of some kind.

Either emange or at least TSI dual injectors w/controller (used on this forums ~$100-200)

Some people can say to use SAFC, but I personaly would avoid it.

 
Rep Power: 271

would it be okay to tune the car with emanage or safc with the stock injectors @6-8 psi so i dont have to buy new injectors.

 
Rep Power: 281

No way.

 
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Rsx injectors, Emanage and Greddy Profec B spec 2 boost controller. You can do so much with this combo. Get dezods harness. Only other option to doing this right would be to get the aem ems and Greddy boost controler. You can Set high, low boost settings, you can turn the waste gate down or up. Set the gain,. and how fast you want it to spool. You should look into it. It saved my *** when the tuner decided to turn up the boost and it spiked. Boost control caught it and turned the boost into limit mode.
Just food for thought.
Jeff

 
Rep Power: 285

Electronic boost controllers are a waste of money imo. Just get a regular old mbc. If the dual stage feature is appealing to you, get a dual stage mbc.

 
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Electronic boost controllers show vacum and positive boost
Electronic boost controller can be limted down so when the hotel parking man decides to drive your car you can set it in limit mode
Electronic boost controller can allow you to see real time boost, and spikes if they acure.
Electronic boost controller can be tuned from inside the car while driving or on a dyno. No need to go under the hood to mess with a manuel one.

 
Rep Power: 285

1. Thats why you have a boost gauge.
2. Who gives a crap about a valet feature
3. Thats why you have a boost gauge
4. You don't adjust boost that often that the in-car feature will be handy. And is it that difficult to go under the hood and adjust it?

Look, im not trying to start, and don't want to get in an argument. Just my .02 on the subject.

 
Rep Power: 281

Look into the pcs and look on an rsx forum for some injectors.

I would do some research before getting the emanage because it can be a pain.

 
Rep Power: 262

all this turbo talk is getting me all hot O_O

 
Rep Power: 310

That turbo is not old. It's been fully rebuilt and balanced and replaced with a stage 2 wheel and a smaller .48 A/R exhaust housing. It previously had .63 A/R exhaust housing. The wheel is in mint condition and there is no shaft play on it. The only thing old on it is the compressor housing. That turbo approximately has 15k miles of usage.

If spool up time at 3500-4000 RPMS is too long for you then it sounds like your looking for a T25 which spools up around 2500 RPMS. You will require a new manifold and downpipe for that. You could also try a stage 5 wheel on the T3 which will aid in spool up time.

 
Rep Power: 280

^^
I see now, it is afterall older but rebuit turbo.
.......
Caquinde, you need somekind of better fuel managment system. Someone has mentioned PCS w/rsx injectors. This is something new and I already like it due to less headaches when tuning, not like emanage.

 
Rep Power: 271

i was looking up pcs and i think i remember it costing around 500 bucks. thats a bit too steep for me, wish their was a cheaper alternative to tuning right.

 
Rep Power: 280

TSI fuel system, reliable unit, has couple of good features (tach, boost gauge, turbo timer). In general, this is like very simpified version PCS.