6 PSI actually

I wonder, why the low HP (150BHP) on this car compared to other custom setups in the 1NZFE, is it just because of the tiny turbo (IHI RFH4) or a conservative tune by TRD to make it safer (it was a mass production kit after all) or... both? what do you think?

 

tune for sure.. the turbo size really just decides "when" you get your power.. a smaller turbo will run hotter however...

 

actually that sounds about right. that is about 125-130whp on a accurate dyno and on 6psi on a smaller turbo that sounds dead on. Believe me... many people on here are claim WHP numbers that are not accurate. When I run on that boost that is what I put down. And yet no-body has ever run faster than me in the 1/4 even though I hear all these high numbers on here.... weird. Just the other day I watched an xB that claimed to have much more hp than me run much MUCH slower in the 1/4 and it was a good drive from what I saw.

 

and this thing spools fast, tiny turbo + short charge pipe (because of the TMIC)... I'm working on a hood scoop to make the intercooler more efficient (it comes with this internal flat plastic scoop thing that directs air from the grill to the IC)

I always thought those numbers people claim could be a bit high for the times they make.

Do you guys think my car should be able to handdle Air/fuel if I push 2 more PSI with no extra tunning??
It uses the TRD ECU (which is most likely the regular computer tuned to handdle the 6 psi, bigger injectors and fuel pump)
I've heard of people running very low boost without any engine management with safe A/F ratios... so a couple more pounds?


125-130 whp stock

+
What I have:
K&N drop in filter + pipes bringing air from the front bumper to the air box (good for a couple of ponies)
Lightened crank Pulley (good for bringing down lost power % a bit)
Catless 2.5" Turbo back exhaust (good for a few horsies, made a huge difference actually)
=
Let's say a conservative 132-137whp
+
2 more pounds ( around 12whp)
=
Close to my magic number for a fun driveable daily driver, 150whp

 

couple of question I have so maybe I can help you out better: Are you running a boost gauge? and what clutch? and do you have a wideband? Reason why I asked if you had a boost gauge is this... when you upgrade the exhaust on a turboed car, it can flow so much better that the turbo will be more efficient and boost higher. You may already be running 8psi instead of 6 just from the exhaust. 2.5" is a good choice, im running 2.25" and now I wish I went bigger... it made my boost go up without touching boost controller when I first installed it. So it may already be running on the lean side and turning up the boost even more without a tune might not be good. A Wideband AF gauge would help out with you monitoring.

 

additionally, a larger throttle body and ported head will yield you more power with less boost..

 

oh no, off course, I wouldn't try to increase the boost without a Wideband (I was actually just looking into a few on the classified section) and boost gauge.

So to answer your questions:
No boost gauge yet
The stock one... which I suspect (but haven't been able to confirm) could be a TRD clutch since... well... it's still alive after 18000 miles of ""spirited"" driving.
No Wideband.

But yes, the gauges are at the top of my shopping list.

Crap I hope that doesn't happen to my car, someone mentioned this posibility to me before and I tried to research on it but couldn't find anyone who had actually witnessed the boost going up after an exhaust upgrade, but let me try to understand, wouldn't the wastegate always open up at the same preloaded pressure? On your car was it just a spike or did the boost actually stayed up?

What are your thoughts on the intake mani, I don't know if you noticed, Weapon R and Richard Holdener are working on intakes for the Xb/Xa (hopefully they will fit my car)
Richard guarantees a 13whp gain on a stock engine, which sound pretty good. But I think he mentioned an intake would provide a fixed gain on both F/I and N/A cars... meaning that you would't get more HP per psi, you would get the same 13WHP than the N/A car... which would still be good I guess for a bolt on

 

Hello noisetube is your Vitz turbo an original TRD turbo or did you / someone convert a normal unit to turbo spec
+ could you post some engine pics of the engine I am wondering about intake setup / turbo / exhaust / ducting for TMIC cooling
http://blogs.importtuner.com/1012920...sta/index.html

 

Well mine is the old Gen Vitz, the one on that link is the new one and it’s only available in Japan right now as far as I know. It is an original TRD Turbo Vitz (original kit I mean)

Mine is like the one on the left:



And here’s a little diagram, so you can understand it better, the air filter box is the same as the one on your Xb, but the top part is looking back, the top of the box attaches to #11 and goes down to the turbo (behind the engine) then up to the intercooler on #19
#23 connects to the TB

 

thank for the info /so the kit is same/similar to the vios turbo