squirrel

With the setup in the sig I can easily hit 1600* and still climbing at 32psi of boost. With fuel pin turned to lower hp setting it max's out at 1400* and 30psi of boost. This is with the waste gate blocked. Dose this sound normal for my setup. I have not been able to get the water meth to bring down egts. Im running a 12gph and 7gph injector off of a hobbs switch set at 25psi. Its kind of a homemade setup so im still trying to figure it out. Do I need bigger water meth injectors?

haloman

Either get the water/meth figured out or run less fuel. MAybe time for a bigger turbo.

Ilikebikes

Water meth will help alot. Could probably still use a larger turbo, though.

loch

No where near enough water. Run a 49%meth and 51% water, you can push it up to 28 gph or that area.

sdstriper

I could never get over the fact that EGT gauges do not come in diesel pickups (from the factory) and there is never a mention of the melting point of aluminum i.e. pistons. Aluminum melts at just over 1200 degrees, 1250 is the max recommend EGT for short periods. There are many parameters involved in why your pistons don't just melt down above 1218 degrees and I know plenty of people who push further, like the original poster here. Your pushing the envelope, I see your trying to address the issue and I would too, after all it is extremely expensive to rebuild or replace these engines.

Begle1

Stock pick-ups (like mine) are detuned to the point that they will never approach 1250 degrees; my truck can run at full PSI for 5 minutes and it'll never get to 1100 degrees.

If average pick-up owners were required to watch something as sensitive as a pyrometer, then it would result in melted pistons everywhere and insane warranty issues. It's much safer to sell a truck that just won't melt itself no matter what.

squirrel

I'll try to get another 12gph water meth injector this week and see what happens. to me the boost numbers seem a little low. For those of you with a similar setup, what boost#'s are you seeing?

BHD

Begle
My truck was stock when I put in the pyro post-turbo and I was seeing 1000+ under full load, which makes the hot side about 1400 right??

Begle1

I don't know what kind of EGT drop you'll see with the stock H1C; 400 degrees sounds like a bit too high of a drop at 18 PSI, though. Still, that's quite toasty for a stock truck. Maybe those pump screws can vibrate themselves loose a little bit.

dpuckett

How/ where is your timing? Is the mechanical/ RPM advance inside the pump working properly? 1600 sounds AWFULLY high for only 32psi with a PDR HX35 (not to brag on the turbo per se). I had the PDR 35 with a ported 18cm housing and manifold, and never saw 1500 on a nonIC truck towing in 5th up hills in the Ozarks. The 40psi gauge was pegged, to boot. No water or meth added.

BHD, Begle1- with the stock 50mm H1C on the same truck, I saw a 450 deg increase in max EGT when I moved the t-couple from the pipe to the manifold.

Daniel

squirrel

Timing is set at the stock notch. I did have the timing advanced but put it back before I put the water meth on for fear of blowing a head gasket. When it was advanced it ran 1500* if memory serves me correctly.

BC847

This will be counter to those who enjoy a large cloud on launch, but you might consider backing off of the early, low boost fueling (smoke screw, star-wheel). That would at least slow the EGT rise initially.

Rambling . . . .

I'm running a lot less fuel than you are based on your Sig, but I am able to build a lot more boost. I currently limit it to 38psig with a manual boost controller. My IP timing is currently at 1.85mm with the W/M. I've had it to as high as 2.10mm before the W/M (ran strong but kinda funny). Setting my heap as such albeit with less fuel than you, I'm hard pressed to get it to 1350*F.



. . . . . you need more air with that fueling!

CTDPower11

Bigger turbo, more air, more exhaust and water/meth would drop the heat some...

gman07

Your boost sounds low, which could be part of the EGT problem. With the 18.5cm housing, I'm still hitting 35psi with stock IC injectors and the pump maxed. I also still have the 3" exhaust, but straight piped (will soon be 4" straight). Something seems off to me. You should check and make sure the wastegate's fully closed (wire it shut and go for a run), and make sure you have no boost leaks.

dpuckett

Sounds like time to check your system for boost leaks. My intercooler LOOKED fine, but leaked like a seive. the shop I took it to plugged the holes, but wouldnt warranty it. I am casually in the market for an intercooler. Back to my point- at your lower boost (32psi peak isnt THAT high), I think you'd be safe with 1.5-1.7mm timing. I pegged the head gasket on my nonIC 91 nearly daily after the marine head gasket (that came stock in your 92), and had no problems. I think between the two, you ought to get something figured out.

BTW- how much pressure, if any, does the water/meth add to the mix?

DP