GlennRMK

Just curious how much difference altitude makes for EGTs?

I am at 5000 feet here in Montana, and frequently drive in the 3000-7500 ft range. Don't tow anything heavier then a 4 place snowmobile trailer(4-5k) and of course thats only in the winter.

With my VanAaken, I am seeing 80 MPH empty temps around 700-850 depending on grade. Towing, I have never seen over 1050-1100 or so and that is with my foot on the floor up a 6000 ft+ elevation pass with the 4 place(going 75-80 MPH up). Unloaded, don't really get over 1100 even running from to 0 MPH to over 100 MPH.

The reason I ask is I am trying to figure out what horsepower nozzles to get. I already have an extra set of stock cores to send in(I would like to keep my stockers with only 42k).

I have an 01.5 HO. Already has 4" straight pipe, turbo back and an AFE air intake.

EDGE Juice with attitude is on order. Should be here next week. I won't be piercing the pump wire till after the warranty is up in July or possibly not period depending on what the injectors do. So it will be in EZ mode. Going this route as I hate my pillar mount gauges. Not a good way to fasten it, and some rattles. Plus, I don't like the mechanical fuel pressure gauge setup, and electric one is $220. Can sell my gauges, get the EDGE and not end up spending that much more.

I have searched and searched with countless threads on here and TDR. And I have come up with mixed results on what injectors to use and be safe with a stock turbo.

Some say Jammer 4s and light towing are fine. Others say it gets toasty towing with Jammer IIs. Of course its hard to say what some say is heavy towing and what isn't. And of course the elevation and terrain is a factor. Not to mention driving style.

I am leaning towards the Mach 1.6 or Jammer IIIs tips. Will be ordering a Con OFE at the same time as the nozzles/tips.

From what I read the 1.6s are 90 hp on the SO and 100-105 hp on an HO. Jammer IIs are 75hp on SO, so 90 hp on the HO. IIIs are 100hp and 110-115 hp on the HO.

Opinions on what is safe to run with a stock turbo. Don't have a huge budget to get the HTB2 or PS62 plus stud the head. Might do it in 2 or 3 years down the road.

I am leaning towards the IIIs unless someone really thinks I will have a problem. Will I be safe at my altitude?

Also, with the EDGE Attitude I can set it to defuel at a given temp.

From what I have read, you don't want to go over 1100-1200 sustained, correct? So, maybe set the defuel at 1150 when towing? 1350 for racing around?

Any recommendations and opinions are appreciated.

Thanks

rebal

get the mach 1.6s you will love them I have gone over a 9000' pass and 3 days ago I pulled 27K (I know I know) and the truck loves them with a stock hx35 keeping EGTs in line are easy as pie !!

RowJ

It makes a difference! less air = less HP. From 650' going to 6,000' I lost 8 psi boost and had a lot more smoke and 150* higher EGT's at 70 mph cruise (gross wt but not towing).

The real question is - How much difference will it make for you (already at altitude). I would say not much...but I would not go wild in size. I would be cautious about any NON adjustable HP added. And I would seriously consider Mach injectors...more HP & less smoke than any others I know.
Just a guess, but anything over 100 HP will be difficult to handle. With the juice and stock turbo... 100 will be too much, I think. I might go with Boosch 275's before chancing tips. 40 HP and same price. All the tips I have seen drive pretty smokey.

RJ

RowJ

That's ok for saftey...but not my idea of fun driving. Nothing there when you step on it.... and maybe that's just when you need it to be there. JMHO

RJ

GlennRMK

So what are recommending? The Mach 1.6s, but not the Jammer IIIs?

Or keep it down to Jammer IIs.

RowJ

I don't know what Jammer # = what HP. I was assuming you wanted to only consider nozzles.
If it were me, I would do Mach 1.6's and adjust my box as needed. They are, IMO, a great step up from stock.

Others can comment better than I can on the Smoke & EGT's from the Jammers.

RJ

GlennRMK

Jammer IIs are 75-80 hp on SO, so say 90 hp on HOs
Jammer IIIs are 100 hp on SOs, or say 110-115 hp on HOs

And Mach 1.6s are 90hp on SOs, 100-105hp on HOs

RowJ

With Juice (adjustable, I believe) replacing VA box...you have room to play with (smoke & EGT wise).

My best recomendation would be Jammer II's or the Mach 1.6's. This all assumes your as smoke conscious as I am.... and have the normal reluctance to drive with one eye on the EGT's. If I lived and played above 5,000', I would have Mach 1.6's instead of 4's. IMO, adjustable, big hp box is much more utilitarian than big hp injectors.

No one else at altitude chiming in??

Good Luck

RJ

GlennRMK

Thanks for the help

I have seen a few sets of 1.5s but from what I'm told they will lope at idle with the HO.

BigBlue

My buddy's HO had a very, very, very slight lope with the 1.5's. With the comp set on kill, 1.5's, and the stock HX35, he could easily hit 1500* unloaded. But all he had to do was turn the comp down. Granted this was at sea level but you get the point. The 1.6's are supposed to be even better than the 1.5's but I don't have any personal experience with them.

rebal

I have 1.6s and love them no smoke and depending on outside air temp I dont even need to look at EGTs. the other day I was headed up to tahoe with a 10k trailer, and putt my foot to the floor to see what it would do ,it held 70mph in 6th on a long steep grade 6% and all I saw was 1200* but outside air temps were in the 50-60 * range on hot days I can hit 1300* or more. on one of the days i was out I pulled 10k over a 9,000 foot pass without any egt issues but my foot was not burried though . I am very glad I forked out the cash for mach 1.6s (you get what you pay for).if you are planing to keep your stock charger 1.6s will make you happy

HOHN

Is that my cue? lol!

When my truck had just an EZ and dd2 (75hp rating in SO, 90hp in HO truck), I could kiss 1300° on a Dyno Jet on a cool day (snowing) in Ft. Collins CO (dynod at PFI).

Then I dynoed on a SuperFlow that would load the truck hard. This was in Greeley, CO (elev ~ 5000ft). On this dyno, I saw my first 1550° EGTs. MMM- TOASTY!! (Sorry, Quizno's).

EDIT: THIS WAS WITH THE EZ AND DD2s STILL^^


All that to say that Altitude is a real killer. The only way I'd even consider running a big injector and towing at high elevation is with twin turbos. Yes, I live in Cheyenne (~6100ft), and yes I run a Mach 4 (150hp) with a ported stock turbo.

But I DO NOT TOW. My truck sees short squirts of power now and then-- never more than 10 seconds or so. In the high altitude, a tighter turbo helps because you need something that will spool earlier.

If I towed with my truck, I would have to detune it via Smary's half power function or by detuning the driver (me).

I personally think that if you are going to WORK the truck hard with a big(ish) injector like a Mach 4, then you ought to have twin turbos. A single turbo big enough to cool a Mach 4 won't spool early enough to be tow-friendly, and it will tend to surge if it does spool early.

If you are going to work the truck hard and want to stick with a single turbo, then a Mach 1.6s is where you want to be in the altitude. Mach 2 with work with a stock turbo, but they will get too warm in the altitude, and you'll have to back out of it.


Good towing twins can be built easily using the stock turbo and an HT3B with a tight housing. This brings the boost in early, and keep EGTs nice and cool.

jh

GlennRMK

Thanks for the feedback guys

Sounds like I will go for the Jammer IIs or Mach 1.6s

Thanks