what happen to soon full boost??? i need help...

[HOMEMADE240SXTURBO]

RB20detTop mount manifoldTurbonetics t3/t4 running on map-ecu.My t3/t4 turbonetics does not spool until 5000rpm. My brother drove it and think that it is very weird. He said something like... I don't want to mention it. I want u guys to let me know if that is normal. Here are the specs on my turbo:

350-500 HPThe T3/T4 Hybrid turbochargers consist of a T3 turbine section, (Stage I, Stage II, Stage III or the Stage V Trim) and a T4 compressor section (T04B trim, T04E trim & 60-Series). This combination offers the low inertia and fast boost response of the lightweight T3 turbine wheel and the highairflow characteristics of the T4 compressor family. All T3/T4 Hybrid Turbochargers are available with the patented Ceramic Ball-Bearing option highlighted on page 9. The Ceramic Ball-Bearing T3/T4 Hybrid series offers the fastest spoolup available. Coupled with extreme durability, the Ceramic Ball-Bearing concept provides the best available performance available in the turbocharging aftermarket. All T3/T4 Hybrids are custom matched for specific applications. Ranging from 200 HP to 600 HP. Contact a Turbonetics Turbo Specialist for application assistance and availability.



IS THIS TYPE OF PROBLEM NORMAL.

[ItzGenX]

Well we need to know what your turbo specs are. Everything you posted said nothing about what the actual specs are on your turbo. Wheel sizes, trim, ar, journal or ball bearing etc.... Basically you are asking us to look for a needle in a hay stack the size of Texas.

[Yellow4g63]

RB20detTop mount manifoldTurbonetics t3/t4 running on map-ecu.My t3/t4 turbonetics does not spool until 5000rpm. My brother drove it and think that it is very weird. He said something like... I don't want to mention it. I want u guys to let me know if that is normal. Here are the specs on my turbo:

350-500 HPThe T3/T4 Hybrid turbochargers consist of a T3 turbine section, (Stage I, Stage II, Stage III or the Stage V Trim) and a T4 compressor section (T04B trim, T04E trim & 60-Series). This combination offers the low inertia and fast boost response of the lightweight T3 turbine wheel and the highairflow characteristics of the T4 compressor family. All T3/T4 Hybrid Turbochargers are available with the patented Ceramic Ball-Bearing option highlighted on page 9. The Ceramic Ball-Bearing T3/T4 Hybrid series offers the fastest spoolup available. Coupled with extreme durability, the Ceramic Ball-Bearing concept provides the best available performance available in the turbocharging aftermarket. All T3/T4 Hybrids are custom matched for specific applications. Ranging from 200 HP to 600 HP. Contact a Turbonetics Turbo Specialist for application assistance and availability.



IS THIS TYPE OF PROBLEM NORMAL.

Did you test for vacuum leaks. That intake manifold has been known to have quality problems with pin hole leaks around the welds. Is the exhaust manifold cracked? do you smell exhaust gases while your driving? turbo lose? CAS broken? could be a lot of things but I'd start with the vacuum leaks.

[Shocker]

I'd say its most likely a timing issue or boost leak issue.

[240z4u]

I have a big t3/t04E and it spools WAY before that.

Do what the above posters suggested.

Evan

[HOMEMADE240SXTURBO]

Well we need to know what your turbo specs are. Everything you posted said nothing about what the actual specs are on your turbo. Wheel sizes, trim, ar, journal or ball bearing etc.... Basically you are asking us to look for a needle in a hay stack the size of Texas.

really, i don't know anything else about the turbo except what i have copied from turbonetics website. I'll try to see if i can somebody close to me get some specs on it.

[Shocker]

really, i don't know anything else about the turbo except what i have copied from turbonetics website. I'll try to see if i can somebody close to me get some specs on it.

unless the turbo is seized or junked out thats not your issue. Its not that big you should be spooling 2-3grand...

[HOMEMADE240SXTURBO]

I'd say its most likely a timing issue or boost leak issue.

My brother is leaning toward valve timing; he said the valve timing might be advanced. I don't know how this could happen b/c killswitch performance in GA is the one that did the timing when i bought the engine.

Is it possible that they might have the valve timing too advanced? as fas as boost leak, i think my wastegate may needs to be tighten down a little bit more because i can hear an exhaust leak. as far as actual boost leak, i'll check some more but i don't think have any boost leak.

The car actually runs really good except it does not have any power until i hit boost t 5,000 rpm. I specifically bought this turbo because some people told me that i should get full boost at least b/w 2500 and 3000rpm.

I'm a little confused b/c this turbo is not like a t67.

[HOMEMADE240SXTURBO]

This manifold is custom build by using the stock runners and the welds actually looks really good and they also have velocity stacks unlike the one on egay. The exhaust manifold is not cracked but it does have a small leak when engine is cold, but once is warmed, there is no more exhaust leak. i don't smell any exhaust leak inside the cabin. As far as boost leak, i'm going to do one to see if i find anything.

But overall, it just seems impossible for a t3/t4 to get full boost at 5000rpm.

[Carl H]

what is the ar on the turbine housing?

[HOMEMADE240SXTURBO]

I have a big t3/t04E and it spools WAY before that.

Do what the above posters suggested.

Evan

I'll check for boost leak when i get home. If it is not boost leak, then i'm guessing timing. i'll keep u guys updated.

[HOMEMADE240SXTURBO]

what is the ar on the turbine housing?

sorry, i don't have any info on the turbo except for what i can get on turbonetics website. I'll see if i can get more info.

[Coolwhip]

Few things to make sure everything is up to par...

Compression test? Are all your cylinders providing enough umph (your car will still boost, drive, and idle normal on 5 1/2 cylinders)

Base timing? You said it was set up already, just double check it along with ignition timing with your CAS.

Boost leaks? $8 to make yourself a boost leak checker will eliminate many of those question marks since so many compenents have been changed or altered.

Air Fuel Ratio/Tune? Do you have a wideband of some sort on there? Having a wacked tune will defenantly disrupt a quick spooling turbo. (Trust me I know)

I bet my $1.20 that your problem most likely lays within the tune if all mechanical things are within check.

[HOMEMADE240SXTURBO]

here are some pictures of the setup.

[240z4u]

Your turbo actually looks smaller then mine physically, not sure what your exhaust AR is. Its stamped in the casting near the turbo flange on the exhaust side of the turbo.

The description you gave is a generic t3/t4 description. For example.. I have a T3/T04e 60 trim, .63 ar exhaust housing with stage 3 wheels.

You sure that BOV isn't leaking? Sounds like my car when the timing was retarded.

Evan

[OKRB20DET]

i like how you have a super dirty engine bay..and open vented valve covers.

yea that'll last long

[Sil240]

Yeah bro you drive around with no Air Filter and open PCV's????

Not gonna be a good look for your motor.

Check out that exhaust leak in your mani because it may stop when the motors warmed up but when your getting on it, it may open right back up.

[Joe]

1) exhaust leak. fix it. leaks dont magically disappear like that and ill damn near guarantee thats your problem.

2) jesus christ plumb your PCV setup somewhere. you are asking for trouble.

3) air filter. now.

[moso240]

OFFTOPIC: Sorry...What Exhuast Manifold Is that? did it clear without modification?

[ripracer]

That or it sounds like he has a ridiculous a/r like .86. My buddy has a sr20 bored .20 over and has a precision 2876r with an .86 housing and it doesn't see full boost(18psi) till like 6300

[Shocker]

That or it sounds like he has a ridiculous a/r like .86. My buddy has a sr20 bored .20 over and has a precision 2876r with an .86 housing and it doesn't see full boost(18psi) till like 6300

Whoa.... thats not a ridiculous a/r... unless his compression ratio is like 7 to 1 or less... his tune/timing/ something is WAYYY off....

SCC did a write up with the Disco Potato or 28r on a stock s-13 they were seeing full boost at 3000.....

[Carl H]

2876r eh?does it use the compressor wheel from a gt30r?if so that might explain the lag but hot damn, thats way laggy.

[ripracer]

you know I forgot he doesn't have a crazy huge core just a smaller spearco or something but he has 3" piping from Mazworx from the Turbo all the way to the TB.

We are going to put back on a 2.25" and see if that builds the boost faster.

As for the disco potato yeah they make that with a .63 I know there is alot of other factors but that little ratio has a bit to do with spool time.

Carl did you happen to get my email about tuning for the tdo5h-18g, I'm that guy and I know you said you were straying away from the scene for a while but just wanted to see if you I could get tune from you.

[Carl H]

i did get your email, i'll shoot you a reply in the am...not on my normal pc.

[HOMEMADE240SXTURBO]

OFFTOPIC: Sorry...What Exhuast Manifold Is that? did it clear without modification?

It will work on a t28 fine but needs to be clocked away from the valve cover to fit a t3/t4. If you are in the market for a top mount for an rb and you don't want to deal with modifications, please get this one: http://www.cxracing.com/mm5/me...=HDMF

[HOMEMADE240SXTURBO]

I'm in the college dorms and as soon as i go back, i'll go ahead and check everything you guys said.

is it possible that running a 3 inch pipe all the way around could make the turbo not build boost fast?

[Shocker]

I'm in the college dorms and as soon as i go back, i'll go ahead and check everything you guys said.

is it possible that running a 3 inch pipe all the way around could make the turbo not build boost fast?

not really, I'm running 3" with a turbo bigger than yours and also missing a ton of timing, but still hitting full boost at 4500. And have a few psi at around 2000 rpm..

[HOMEMADE240SXTURBO]

well guys, something went wrong. After my bro and i finished wiring up my aftermarket tach and install a new fuel filter, my car started smoking. Well i mean white smoke. My vacuum gauge came down to 10 from 20.

-Some people said that my turbo must be bad but would that make my vacuum gauge come down?

-Some people said that my headgasket must be blown, but then again, i was only running 6pounds of boost. how can this happen?

Well i also notice that i had to fill up the radiator every week even though i do not have any external leak.

What do you guys think?

[Joe]

well guys, something went wrong. After my bro and i finished wiring up my aftermarket tach and install a new fuel filter, my car started smoking. Well i mean white smoke. My vacuum gauge came down to 10 from 20.

-Some people said that my turbo must be bad but would that make my vacuum gauge come down?

-Some people said that my headgasket must be blown, but then again, i was only running 6pounds of boost. how can this happen?

Well i also notice that i had to fill up the radiator every week even though i do not have any external leak.

What do you guys think?

headgasket or worse.

[HOMEMADE240SXTURBO]

it it weird that it is the headgasket b/c i was only running 6psi... i just don't want to believe it...