T04Z Or Gt42 Roller Turbo For Street

[01txr]

Dalts

Sorry must got him mixed up with someone else, but did hear of someone running one and doing a 9 as it was 1 of the reasons why I went with the TO4z.

I'm not to interested with what numbers it pulls on a dyno or down the strip, more interested in it being a good streeter and want it to work well on circuit as love to push hard through corners and have good response out, don't like a car that you WOT it wait for the power to hit, only to have to back off as it starts to go very hard as you have run out of road.

*Beep*

Yes only 11.3 as it was also a t56 and struggled to put power down. Bit like Bcl's huge power but being manual just so hard to get it to hook up.

Mates car made 780rwhp on race fuel.

It's problem on street was it's 3500 spool point as a posed to mine spooling from as low as 1100. On pump fuel he was running 600rwhp and that was not enough to give him any advantage on mine as said from earlier, from stand still nothing in it, over approx 400m he would have near car length on me. the difference showing basically in 4th gear.

Keep that In mine as only running mine on soft 12psi tune.

Low speed rolling start and I was getting approx 2 car lengths on him before his would spool. Never tried any high speed rolling starts but think that's where he would have reversed the out come for sure.

Was hoping to have new engine finished to be able to see the difference once I could start running 20psi, bugger sold car so won't be able to compare it now.

Don't know the truth in why he did, weather he was pissed my internally STD BA engine with it's little TO4z was a better streeter, or the fact he told me how he had run some quick cars and been beaten all because of the lag. Or he got bored waiting for me to build my new engine or what he told me in he sold it to spend more family time???

I know at one point he was thinking of trying the TO4z but was talked out it by his engine builder, that's when he had wheels & housings changed, but still didn't respond how he wanted it to.

I think he was not happy spending what he did on it and finding it didn't run as quick as his previous cars, other street cars he has owned have run sub 10's.

For street car I really can't see another turbo being better than a TO4z, they spool very quickly they make good usable power and more. I may be a bit bias or wrong but I know mine works well, even my twin plate CI clutch had signs it was not coping with the power. Will have to contact CI to see if I can change from fibre disks to button.

I stupidly connected both vac & pressure on my Progate 50 WG when first hooked up my TO4z setup, and when tested it, it was useless, I mean my Toyo Proxy tyres could not put power down with 1st gear stab, instant wheel spin redline, get off it, 2nd repeated & 3rd same. Obviously pulling full boost, supercheap digital gauge shat itself, thinking WTF fixed plumbing to WG.

From that experience I know my street tyres are hopeless and that there is plenty of power for me to gain when I do step up the tune from 12psi to 20psi.

I know unless I find better street tyres I can't run much more boost then the 12psi I was but will be able to add boost in the taller gears apparently by use of a Eboost2.

Hope that is correct, have to learn a bit about setting up for the Eboost2 if it can be done with running factory ecu.

I'm aiming for mid year to have it all up and going again with the new engine (yes long time, funds are tight)

Will have to find a few of you guys with larger turbos so we can compare differences, maybe convert a few of you to wanting a TO4z. LOL

Sorry for my huge post but hope some of it is useful to someone.

Yes you want big power it is expensive as everything around the power source needs to be upgraded to support it as well.

[RAP1D]

Looks good 01txr, get an airbox in there and it'll be even better down low.

What spec did you get it built to? There's a good half dozen combos for most turbos, so be nice to see what yours is...

Wheelspin at low revs us another thing that sux and is greatly reduced with big turbos, and when correctly set up and tuned can be very progresive in power delivery.

I'm sure if you come to Sydney one of us will take you for a run and change your mind

[Ralph Wiggum]

I was but will be able to add boost in the taller gears apparently by use of a Eboost2.

You can set an Eboost 2 up too do this. You need some form of map switching, I intend to run 3 micro switches the are activated by the Gear Stick in 1st,2nd and 3rd gear.

Too Run the eboost with a tuned Pcm, Setup for factory boost map the same as you highest boost Profile IE 4th or 5th gear, Set your under/over boost thresholds to max and you should be right. No need to touch wastegate duty cycle etc.

[01txr]

Rapid

Running .96 exhaust .7 front 4" inlet, not sure on wheels, just told supplier what I'm running and that's what was supplied.

I actually wanted 1.06 exhaust but it came with the .96.

I wanted to get car back on road so badly and decided to run it and see how it went.

I was very impressed so whoever spec'd it up got it spot on for me.

Thanks Hiddeous on the heads up, was thinking of micro switches my self to as the friend of mine who had the GT45 setup was changing it by the eboost2 button, something I didn't want to be doing while WOT.

He was running motec ecu, hence why I was not to sure about weather I will be able to set it up with the factory ecu.

Probably only going to set it up for 20psi 3rd-6th.

Another issue is that car was originally t5 and I changed it to the T56, the ecu is set for 5sp.

Been wanting to get a BF 6sp man ecu but sounds like a lot of hassle.

Be good to set tune with use of 6th and to run reverse lockout properly and not by the brake switch.

It hasn't been a issue for me anyway as 5th gear it's going pretty hard with the 3.46 gears.

And you font need to run 5th-6th gear anyway as it's usually well over by then.

Heard 6th isn't that strong anyway and should not be used with to much right foot.

Another thing I want to sort is the 2 step launch control option in the tune, I get the limiter working but it won't turn off with set speed.

Followed all the suggested instructions but still can't get it to work.

[Ralph Wiggum]

Just get a Ba2 manual

PCM, I assume you've tried flashing a Ba2 manual config into the PCM?

I have one in HPT format if that's ant use too you

[01txr]

No havnt tried to flash a BA2 file in, wasn't aware I could.

I only have the racer pro tune package.

It would be very appreciated if you could PM and explain what I need to do to do it.

This is first computer car I've owned and decided to tune myself, built many v8 clevo's and windsors as well crossflow 6's and VW engines and all have been carby.

Basically I got start off tune from BPR as well the racer pro package, loaded it up and sorted the tune from there.

Injector setting where way off rich as hell, as wasn't sure on spec of the nizpro Injectors and Matt just took a guess at it, Danny ( Headsex) gave me a decent setting to try and I work from there, since changed to siemen inj and been experimenting with boost and fuel tables, spark has been good so have not started to work ignition tables as yet.

That's about my knowledge on tuning these things.

Back on subject of TO4z probably should point out that a large frame turbo won't be as affected with drivability in a high stall auto.

In manual it's very hard to get them going, so easy to light the tyres, bog down or fry the clutch.

As well rolling accel if you are low in rpm in gear and lag hurts, if you pump the clutch you have massive wheel spin and if you try fanning the clutch your most likely to fry it.

That's where the TO4z is so much better.

[ALF05T]

This topic is very informative. Seems like the T04Z turbos (at least for the manuals) are the best street setup.

I'm aiming for 450rwkw with the externally gated turbo and 6boost manifold. I have a built motor and process west plenum kit

so there should be no reason why I can't crank up the boost to see what numbers I can punch out!

With the built motor can more timing be fed in at lower rpm to give a more linear power delivery?

Cheers Alf

[SPIKO]

The T04z is now a very old design turbo and in my opinion has run it's coarse, it will soon be replaced...

If your surroundings are optimal and your tuner is experienced the difference in spool between a T04z and gt4094, t51r Kai, gt4294 will only be 300rpm max!

If your budget allows it in my opinion you should be sourcing a gtx3582r or gtx4294 with a 1.02 or .98 rear housing respectfully coupled with a 6boost manifold and nothing smaller than BF cams. The later will spool quicker than the older turbo's all day every day, max

power on the gtx3582 is around the 750-780hp engine & 900-950hp engine for the gtx4294.

[MattyP]

On 28 January 2011 at 9:56 PM, Boosted1 said:

I have a hta3794 on my xr6 turbo, it has no more lag than a gt3540 but shows simular if not better results to the gt4094 in a small package. the lack of lag actually surprised me alot! very very streetable!

I need to know what happened to the hta... 

 

I want it

[masda74]

 

6 years in the running.