SjLingenfelter

Could i run a hx40 and a Hotrod vp44 with my 125hp sticks and DRAG COMP and still be ok?

BigBlue

Doubtful. I'm surprised that your doing halfway decent with the 125's/comp/HX35.

RCW

I suspect you need to chat with Scheid diesel and see if their Lightning VP44 is compatible with your injectors. From my flow calculations, it certainly should be, but I do not know if they have solved the lubrication problems so that package will run on the street.

I am not so sure that you can still get the Hotrod VP44. It is my understanding that there have been a very high incidence of failures that have resulted in it being discontinued, but chat with Piers and see if he has better information.

As far as the HX40 goes, get one with the exhaust turbine side modified for your application, and use an ATS pulse exhaust manifold to control the exhaust pressure and flow rate so it will work with the new turbocharger. The OEM version of the HX40 will just bog and crawl until you get at least 38 lbs of manifold pressure, and that is unworkable on a truck that sees the street. I use the Piers modified version on a highly modified P pumped third gen engine, and it is great if you can control your fueling rate enough to avoid lag at rpm's under 1200. The conundrum on VP (and CP) equipped engines is getting enough volume of fuel to make the HX40 really work, and not burn up the injection pump in the process.

If you are going to continue the OEM exhaust manifold, look to one of the other performance turbo packages now on the market to work much better than the HX40.

rockjeep73

Industrial Injection still builds and sells HRVP44's, thats where mine came from.

PourinDiesel

Dont even mess with the HX40 turbo modified or not.
For the price you are much better off buying a modded borg warner/schwitzer unit from II or HTT, or TAD.

The problem with the HX40 is having too much fuel for it. The HX40 is a notoriously weak turbo, it is a decent unit for performance in a modified state.

I ran a drag comp on my 99 and 125hp injectors with a stock VP44 and that combo resulted in pretty warm EGT's and around 42-46lbs of boost.

There is probably not a simple answer to your question.
Yes you would probably be ok, but thats about it.

The fuel question: You will have more than enough fuel.

Jetpilot

I would consider a different turbo choice..... You can get an excellent hybrid that will spool as fast if not faster than the HX40, flow more air, and be a lot more durable for around the same price. You could go with something like a Phat Shaft 62 or an HTB2 and be very happy.

We have set up several trucks with the II HRVP with good results. Paired with the right turbo you would have a nice setup.

Doug

SjLingenfelter

How much are the phat shafts goin for now?

PourinDiesel

Which model?

Ph4tty

PS62 is listed on II's webpage at $1200.
PS64 and 66 lists at $1625 msrp.
http://www.industrialinjection.com/m...e+Turbocharger

At that price I'm surprised there aren't more folks running the PS62.

Will Manchester

I'm running an HX40, IIS VP44, and a set of Mach 4 (150HP) injectors. Its an ok combo, but the HX40 is definitely running out of air. It barley has enough air to run with the box off. My EGT's with my TST on is out of sight, I don’t think they make an EGT gauge that goes high enough. The power is there with the 40, but I know there are plenty of lost pony’s per the black coal out my tail pipe. The spool characteristics of the HX40 are not that bad. I recently put in a set of stock injectors, plenty of fuel to spin up the HX40, really not too different than the Mach 4's. It does a decant job towing as well.

With that said, I highly recommend the SPS64 - just got a in a truck with one of these turbos and all I can say is it was amazing. Better spool than my HX40 and could clean up a set of Mach 6 injectors (I think they are rated at 220 HP) with a comp on 5x5. Much lower EGT's as well, no higher than 1500 degrees. HX40 is old school now - its an ok turbo, but your $$$ is better spent elsewhere.

As far as the IIS HRVP44, Industrial Injection has been making these for years. I've not herd of anyone having an issue whit them to date. I've had mine in for over a year – still running like the day I put it in. Oh, and a BIG bump in fuel/hp over the OEM!

SjLingenfelter

I cant hotrod like i used to cause my egts will hit 1700* quicker than ever with 45psi out of hx35. I just need something with a lil more air but not too big to tow.

BigBlue

Either a phatshaft or twins.

RowJ

IMO, you won't lose any HP, and your EGT's will climb much slower, if you limit your turbo to 38 psi. Anything above that is expansion pressure, instead of compression pressure, and just part of the problem!
RJ