Engine/Transmission (1998.5 - 2002) New Air filter upgrade? high EGT

[Edge]

I have an 01 dodge, We just did a 40HP injector upgrade and put on a holset super 40 turbo, I have a 4" exhaust all the way. I really have to watch my pyrometer when pulling moderate loads as the exhaut gas will hit 1200 pretty easily and I really have to stay out of it to keep them down. Thinking I need some serious air flow. currently I have the stock intake box with a k&n filter.

 

[ThrottleJockey]

Edge,



Welcome to the TDR!

There are literally TONS of choices on a cold air filter kit for our trucks. Just pick the right application for your price range and have fun. Installs take about an hour right in the driveway.



However... .



A cold air kit alone will not keep your EGTs down. I too have an '01 and the biggest bang for my EGT reduction dollar was the 16cm2 exhaust housing that came on my PDR HX-40. How big is the housing on your Super 40?

 

[Edge]

I have the 16cm2 housing on mine as well.

 

[HBarlow]

1200* measured at the exhaust manifold is nothing to worry about. I always tried to use 1300* as a limit for sustained towing up long grades and occasionally let it run at 1325* to 1350* on my '01 HO6spd w/275mh injectors and no other modifications. The truck has 350k miles on it now and still runs strong with all original parts.

 

[Beast2B]

Bang for the buck? Search for BHAF. There are several options for brands and sizes. The biggest difference in EGT while towing for me is downshifting. Don't lug the motor up a hill, keep the revs up around 2000-2200 and keep a lot of air flowing.

 

[DSeamans]

Boost

When I switched to Mach 1. 6s and a hybrid turbo, my preturbo egt's would go to 1350* instantly! The wastegate came on the new turbo set at 25psi. I set it to 35psi and now I can't hit 1350* - even passing 110mph floored in sixth gear!



Dave

 

[PC12Driver]

All other things equal, a larger turbo will increase your low-mid rpm egts, especially when towing. You'll need to keep the RPMs up to get enough energy out the exhaust so the compressor side of the turbo can do its job.



With that being said, 40hp injectors alone don't justify a large jump in turbo size, if any at all. A stock HX35/12 tows great with 300-350hp without the big jumps in egt when you're under the turbo. What other fueling mods do you have, and what sort of truck are we discussing here?

 

[Edge]

My truck is a HO 3500 4WD dual real wheel, I pull mostly around 16K lb's sometimes heavier, the truck has a fass system, I have a Van Aken 65hp chip, it has been disconnected for about two months as I have been having repeating APPS failures, all of which have came from Schied diesel, thats another issue, I have been checking the other post about that one and will be changing something, not sure what yet.

I have just under 300K on the truck, after developing a head gasket leak, in the repair process we found the turbo just about shot so we replaced it with the HX40, At this point I am looking for the best solution for my truck, I would like to replace the van aken with something else as well, I drive the truck daily and pull a few times a week, although I have just bought an F 800 with a 12 valve to relieve the Dodge of some of the wear and tear of pulling.

 

[Gary - K7GLD]

1200* measured at the exhaust manifold is nothing to worry about. I always tried to use 1300* as a limit for sustained towing up long grades and occasionally let it run at 1325* to 1350* on my '01 HO6spd w/275mh injectors and no other modifications. The truck has 350k miles on it now and still runs strong with all original parts.

I may stand corrected here - but what reading I have done on the '03 and later CR trucks seems to indicate that they are engineered/designed to safely run a bit higher EGT than older versions as the original poster here owns? Even at that, seems that there have been a significant number of failed pistons in the later CR engines?



With my own mods in my sig - and still the OEM turbo, I rarely see over 1100 degrees on steeper grades towing at WOT - and being somewhat chicken, that's pretty much high enough for me...



YMMV

 

[Bob4x4]

The HX40 is too big for just 40hp injectors... ... What boost are you seeing under load?

 

[Edge]

I will have to check, I am thinking about 15 to mabee 20 when accelerating

 

[Chief USA]

Install a BHAF with a heat shield and an Outerware Prefilter. The stock air box is a huge restriction in an of itself and the K&N filter is not much help or a very good filter in my opinion. I tried one of the Afe high flow filters that goes in the OEM air box... ... it looked nice but was JUNK. I lost 6 psi boost from what the stock OE paper air filter provided.



I would recommend a 5 inch exhaust. I recently installed a 5 inch straight pipe exhaust on my truck. My EGT's went down approx. 150 - 200 across the board and I gained about 4 lbs. of boost as well as a much quicker spool (lag time) on the turbo.



Bob4x4 is right. The HX40 is way too big for the injectors you have. I suggest installing the Formula 1 Mach 1. 6 or 2. 0 injectors or put the stock turbo back on.



The Van Aken should provide about the same increase in power as an Edge EZ.



You mentioned APPS failure. Have you verified by checking codes? What lift pump are you running?

 

[Edge]

O. K. I will check with my mech to find out sme of these questions, he did say today that the injectors were actually about 90HP, I will find out exactly what I have, lift pump is a fass system, are there diff ones?

On the codes, yes we have verified by checking codes

I will check out the BHAF air system many thanks

 

[Chief USA]

Here is where I got mine:



Vulcan Diesel Performance offers DDUSA twin turbos, FireBall injectors, DrawStraws, Big line kits, FASS fuel pumps, Parker bio fuel line, Quadzilla products, DTT Transmissions, Isspro gauges, High Tech Turbos , Veg pumps, metric adapters & fittings,



Outerwears Prefilter for the "Big Honkin Air Filter", BHAF.



You can make your own heat shield or you can find them on eBay from time to time. A guy who goes by the username "Objectmaker" makes the heat shield. Does are REAL nice job on them.

 

[ThrottleJockey]

Your turbocharger is fine. The problem with the 12 cm2 exhaust housing is that it is too tight for towing. For a truck that is street driven unladen, the 12 housing twisting up a hybrid wheel is great fun. But the characteristics change when towing. The 12 exhaust housing becomes a restriction in the exhaust path. You get good spool, but spool up is not a sought after trait while towing a trailer, so it is therefore useless. There isn't a set of twins built that will outspool a single, yet a set of compounds will out tow any single. Spool up and towing in the same sentence is silly.



What you want is an engine that creates efficient boost inside of it's mapwidth while keeping backpressure to a minimum. An engine fighting backpressure will not tow well, creating high EGTs and cylinder pressures.



Your new intake should perform nicely, and try to accelerate a bit less... . shall we say, enthused.