Izusu 4JB1-T turbo upgrade options

[yoda2026]

ive got a holden rodeo which has a 4jb1t in it and the thing is a total slug


ive been looking into getting abit more power out of it an intercooler is one option but i carnt see the point because the turbo thats on it is about the right size for my lawn mower let alone for my truck

so im wondering has anyone here put on a larger turbo
if so which one

how much boost are you out putting

and at what rpm does it spool
ETC

thanks in advance for your advise

[yoda2026]

also i have a variable vane turbo off a 2007 audi Q7 but im unsure on how to controll the vanes they have a stepper motor control

has anyone tried to control a VGT with a waste gate actuator and how successful where they

or where to even get info on KKK turbos

[Dougal]

Can you give us the model code of your current turbo and the amount of boost you run?
You need a boost and egt gauge before you make any mods. Establish a baseline then see what's possible.

The Q7's came with a variety of tdi engines. Which one is your turbo off?
An intercooler alone won't help. But with more boost and fuel an intercooler will help. First we need to know what you've got happening. With a boost gauge and rev counter you'll be able to tell us exactly when the turbo wakes up and starts boosting.

[bush65]

The stock engine 4JB1T is in a somewhat low state of tune and people have got good performance by increasing fuel, boost pressure and intercooling.

With diesels, power is determined by fuel rate, which is controlled by the governor on the fuel injection pump. But the mass flow rate of air has to increase to ensure the extra fuel is burnt - if not, black smoke (incomplete combustion) and high exhaust gas temps will increase.

Unless you are after very high performance, you may find the existing turbo ok. But a suitable size variable geometry turbo will give good performance across the rev range.

There is info about for various BorgWarner turbos (Schwitzer & KKK), but next to none for the VG and 2 stage etc. turbos for which BorgWarner was OEM for the engine/vehicle manufacturer.

If you know the size designation for the Audi turbo (could be marked on it somewhere), or measure the compressor wheel, you will probably be in the ballpark if looking at compressor maps for the same size fixed geometry turbo sold aftermarket.

I'm guessing the compressor on the Audi turbo might be as for a K04 or possibly K16 - some info here and some maps here

BorgWarner list 3, K04 turbos (in 2004) for upgrading 1.8 litre Audi engines, all have same inducer (1.7") and exducer (2.2") dimensions for compressor wheels, but 2 compressor maps are very similar and 3rd quite different.

Download BorgWarner 2010 catalogue and 2007 catalogue

I have a stock Garrett VNT turbo controlled by a wastegate actuator - the engine this came from had no ecu. Basically the same turbo is used by many manufactures with a vacuum actuator so the engine ecu could control the turbo.

If you can connect a wastegate actuator to control the nozzle vanes, then you will probably be able to get acceptable control of your turbo for what you want.

Modern engines need much greater control over the turbo to meet current emission requirements with egr etc. You simply need to open the nozzle vanes as the exhaust flow increases with higher engine speed and load - a waste gate actuator and boost pressure should do this, provided the spring matches.

Edit: Looking at BorgWarner info, they don't appear to have a VGT turbo in K16 size, so the Audi turbo will most likely be a K04 variant.

[yoda2026]

the turbo is off the 3LT diesel audi Q7
its a KKK brand turbo
with markings as follows sorry they are in german
groesse : 059 145 715f
LADER-NR: if 5100092 00288
AUSF-NR: BV50 0054

and its got a borg warner turbo systems controller on it
5900 110 7032
059 145 725E
A2C53106046
28.6.06/00:10

its about the size of a garret T25 accept is Doesnt have a T2/T3 mount is uses some strange 3 bolt mounting

i have so far been unable to find any info on this turbo so any info would be greatly appriecated


i have a EGT sensor in atm and the boost guage is going in next week.
the current turbo on it is an IHI RHB5 (its gotta be one of the smallest turbos ever made)
considering its in stock form id imagin its currently running about 8PSI of boost and seams to come alive between 2300RPM and 3500RPM(by 3500rpm the turbo has run outa puff)
im not sure if im dreaming or not but id love to run an intercooled 15/18 psi of boost

[Dougal]

The IHI are a really compact turbo, but the RHB5 has a 50mm compressor wheel. The Garrett T25 has a 51.3mm compressor wheel so it's basically the same size.

I think your IHI will handle up to 15psi boost fine. Of course you need the extra fuel to drive it. If your fuel pump has a boost compensator with a pressure line from the manifold then it could be the problem. Take the line off and blow down it. If it leaks air then the diaphragm in the boost compensator could be worn out.
My 4BD1T did this and had the same symptoms you described (low boost, took lots of revs to get extra boost which triggered extra fuel etc). A new diaphragm made it feel like a whole new engine.

[yoda2026]

i dont feel comfortable running a turbo at its MAX pressure rating
the compressor wheel on the Q7 turbo is about twice the size so i think ill see if i can get it mounted on it

[Dougal]

i dont feel comfortable running a turbo at its MAX pressure rating
the compressor wheel on the Q7 turbo is about twice the size so i think ill see if i can get it mounted on it

15psi is far from the max pressure rating of an RHB5/RHF5. IHI published the max pressure ratio of 2.8 for those turbos. Unless you've got a major intake restriction they'll push 25psi safely.

I think you're barking up the wrong tree. If you can't get it to perform with the stock turbo, you're probably going to have the same problem with a different turbo.