Turbo Exhaust Back Pressure?

[MurderedSport]

I have a WH1E Holset turbo. I didn't plan on putting it in my '01 Sport but I thought, why not?
I know how to set it up but I didn't know if my engine could support this turbo so I googled the manual.
In the manual it says:
"Exhaust systems must be capable of operating at exhaust back pressures of up to 10 kPa (1.5 PSI).
This limit is increased to 13.4 kPa (2.0 PSI) if a catalytic converter is fitted."
Could a 4.0 support this?
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Also how many pounds of boost should I run on a stock 4.0 SOHC?
I would run a lot if it wasn't stock but there arent many parts to beef the engine up that I can find online......
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Thanks

 

[colintrax]

You might wanna change the title, looks like another person asking about the myth of back pressure being good. Add "turbo" to get the turbo gurus attention.

As to your question, I'm pretty sure it's fine. 2psi isn't much

 

[MurderedSport]

You might wanna change the title, looks like another person asking about the myth of back pressure being good. Add "turbo" to get the turbo gurus attention.

As to your question, I'm pretty sure it's fine. 2psi isn't much

Exactly what I thought, but it won't let me change the title I don't think, I tried.
Edit: I had to go to advanced settings, thanks.

 

[MurderedSport]

Here's the beast:

It came off a cummins. No shaft play, wastegate opens with no problems, but it might have a bad seal. Picked it up off of craigslist for $40. Said he bought it at an auction off a wrecked truck 10 years ago and sat in a box ever since. (You could tell, it had 10 years of dust on the box.)

 

[2000StreetRod]

Max boost

Boost above 5 psi will probably require a custom tune and maybe higher flow fuel injectors.

 

[MurderedSport]

Boost above 5 psi will probably require a custom tune and maybe higher flow fuel injectors.

Do you think I could hit 10 PSI with the stock internals and a tune?
Or will it not handle it?

 

[2000StreetRod]

SOHC V6 vs 5R55E

Many have run 10 or more psi boost with the stock internals. I suspect the engine at that boost will outlive the transmission. For 10 psi you'll probably also need to upgrade your fuel pump.

 

[jd4242]

Personally I wouldnt waste time or money with that turbo on a stock setup..its way to big

 

[MurderedSport]

Personally I wouldnt waste time or money with that turbo on a stock setup..its way to big

as long as it works i think it'd be fine. I mean I can't upgrade my engine since nobody makes parts for a SOHC 4.0 otherwise I would
Plus I could get all the turbo parts off craigslist for $500 and install my self

 

[jd4242]

as long as it works i think it'd be fine. I mean I can't upgrade my engine since nobody makes parts for a SOHC 4.0 otherwise I would
Plus I could get all the turbo parts off craigslist for $500 and install my self

People make upgrades.I would think that thing would take forever to spool off a 4.0 and once it does it will put off some serious boost.also where are you going to put it at, where it will fit and can be plummed??? Anything over 5lbs and your gonna need a tune, fuel pump, injectors, maf...etc etc and im sure that thing will make over 5lbs and anything under there is no point of running that big of a turbo.small one would spool faster, earlier and produce more boost than your ever need for a stock 4.0.

Not saying dont do it or try it just personally if it was me I wouldn't.

 

[jd4242]

http://www.moranav6racing.com/category.html?CategoryID=32

http://www.supersixmotorsports.com/

 

[MurderedSport]

People make upgrades.I would think that thing would take forever to spool off a 4.0 and once it does it will put off some serious boost.

I found the manual for this turbo and it needs very little exhaust pressure to spool. It will have a lot of lag most likely but I was also thinking of doing a twin sequential turbo setup with two turbos running 5LB's after a tune of course. (A small turbo for lower RPM's and a big one for higher RPM's)

also where are you going to put it at, where it will fit and can be plummed???

My engine bay has a lot of room and I plan on using a top mount intercooler cooled by a hood scoop since there's very little room in front of the radiator.

Anything over 5lbs and your gonna need a tune, fuel pump, injectors, maf...etc etc and im sure that thing will make over 5lbs and anything under there is no point of running that big of a turbo.

Yeah I would start at probably 5 and hopefully one day get it up to 10 with the sequential setup I was talking about.

 

[jd4242]

Im interested for sure.keep post and pictures coming

 

[MurderedSport]

Im interested for sure.keep post and pictures coming

Yeah, for sure. I'll definitely be posting a lot this summer when it's nice enough to work on outside.

 

[norm209326]

Boost above 5 psi will probably require a custom tune and maybe higher flow fuel injectors.

Correct. Simple work around though:

Get an apexi AFC-2 (air fuel controller used mainly on Hondas) and look up an ecu pinout for your truck and wire in everything on the AFC2 except for the vtec controller wires. You can now adjust your fuel input by +- 50%. Most likely you will be adding fuel once you get into boost. Also make sure you hook up and AFR gauge to fine tune it.

If you still cant get enough fuel with the AFC, create a port on your intake somewhere (preferably in the manifold immediately following the throttle body) and run a sub injector. You can run a hose from the injector to the schrader valve on the fuel rail and pick up extra fuel. Now wire the VTEC control wires from the AFC to the injector and program the AFC controller to signal that injector under boost.



A little tricky to wire but it can be done and works fairly well. I know for a fact because I did this to solve fueling issues on my 99 sport 4.0 OHV that I turboed. The other tricky thing is ironing out exactly what size turbo to use. I only turboed one bank so I have a T3/T04 hybrid with a tuny exhaust housing and a much larger compressor housing (exhaust housing for about a 1.8L and compressor housing to feed a 4.0L)

 

[2000StreetRod]

unbalanced power output

My 1973 Volvo 142E had a separate cold start injector similar to what you're describing. It seemed to work fairly well although injecting fuel into the intake manifold is less efficient than injecting into the head intake port.

At first the idea on only boosting one bank and the unbalanced power output seemed crude to me. But after thinking about it, I realized it's similar to the current practice of disabling cylinders for fuel economy. However, I doubt that it's good for the drivetrain when the engine is under heavy loads.

 

[Flash]

My 4.0 cents worth.

An overhead type intercooler absorbs a lot of radiant heat from the engine especially when idling.

The best way to set up turbos on a V6 is a small one on each side, they'll spool up a lot more quickly; then feed them into the sides of a front mounted intercooler with the air charge coming out of the centre at the top and straight down the throat.

I've seen this setup on other V6 cars.

 

[jd4242]

If we are talking about 95+ explorers the best way is to just get new injectors,90mm maf and sct tune it..its obd2, simple and the correct way of doing it.intercooler or w/m for heat issues. Tried and true way of doing things