Engine/Transmission (1994 - 1998) making too much power! how do I turn it DOWN!

[paulsmith]

OK, here's the deal:

Ordered a new transmission from DTT, they suggested I get the 3000 gov kit. I was running a bad ass #8 fuel plate. I install the gov kit and it idles at 1000 and has no bottom end. I call Peirs, and they say either adjust the rocker arm, or better yet, get a #10 plate to go with the 3K kit, (works better they say). I order the #10 plate!



So.....

Today I loosen the gov springs each one "click" (1/4 turn) and the idle is now down around 700 to 800. I then install the #10 plate I just received.



Before, the trans slipped a couple of times when hot (with the #8 plate), and egts were close at 1200 f when floored.



After I installed the gov kit last week, the truck was gut-less, but the trans wont slip, and egts (and boost) were way down.



Today, after installing the #10 plate, I can toast the transmission, I mean it slips BAD on demand (anything over 20 psi of boost)! The EGTS shoot past 1300 f before I let up, and boost is way past 30 psi (stock turbo).



So my problems: one, the egts have got to come down! Two, I need to ease up until I get the new trans in. I have a 500 mile run to make next tuesday with this truck to pick up 8000# trailer. I can leave the cruise off so it wont floor it, but I MUST drop the EGTS!



Can I slide the plate to reduce power? I am at a complete loss as to how this works, but from what I can gather, sliding the plate forward (to the radiator) increases fuel, what affect will sliding it back have? I LOVE the power I have now, and after my new trans is in it will be great! but I cant have the egts up this high!



I have a open (no muffler cat or nuthin!) exhaust, and a amsoil drop in filter.

 

[Cooker]

For now, your best bet would be to slide the plate back (towards the cab) and this should help your EGT issues some.

 

[illflem]

Slide your plate towards the rear a lttle at a time to decrease fueling. Bigger turbo wouldn't hurt.

See what you got yourself into?

 

[paulsmith]

So, a bigger turbo... .



I have a 96, which I thought had one of the bigger factory turbos. If I was to upgrade, would I need to complete turbo, or just the exhaust housing, and what turbo/exhaust housing should I be looking for?

 

[w-cummins]

Originally posted by paulsmith

So, a bigger turbo... .



I have a 96, which I thought had one of the bigger factory turbos. If I was to upgrade, would I need to complete turbo, or just the exhaust housing, and what turbo/exhaust housing should I be looking for?

Well if it's still too much with the plate moved back I will trade you my #11 plate I'm in Iowa and could mail it off to you and you could swap it and mail me back yours



William...

 

[paulsmith]

I still have the #8 plate I could go back with, but, well.....

I like the power, really like it... . a lot. For now I need to turn it down, but after the trans is in, I will want that power, but need to get those egt's down!



Does anyone think installing a physcotty (sp) type air filter would make a big differance over the drop in amsoil filter?



This is almost as fun as racing a mini van!

 

[Cooker]

I don't think a different air filter will have enough impact if you EGT's are already out of control. Sliding the plate back, or as illflem suggest a turbo change will have a significant impact.



You could change out the entire charger to an HX40, but unless you are running big injectors I do not think you have enough fuel for that. Swapping just the exhaust housings should reduce your EGT's. The stock housings are 12cm, you could go to a 14 or even a 16cm. The 16 may be a little large and have a bit too much lag with your DTT auto. The 14's are good for about a 75 degree EGT's reduction over the stock 12's.



What is your peak boost? One thing to keep in mind if your wastegate is disabled or has failed you may be over-boosting the turbo and if this is the case, it is not helping your EGT's much either.



Sliding the plate is your best bet IMHO.

 

[Keith1]

if i was you i would call bill you should not be any where near that transmissions limit yet im running 370,3000gsk,#6 plate and i cant walk through my dtt yet so i think you need to talk to bill

 

[JohnE]

Yes, slide the plate back.

I have 3k governor springs and a #4 plate (hotter than a #10) slid all the way BACK! I have the AFC housing about ¾ forward with the star wheel a few clicks forward.

Running empty and hot rodding I can see 1500° on the pyro if I keep it in 3rd locked and really crank the rpm.

Towing and running rpm in the low to mid 2k range I don't get temps past 1200°.



Ah yes the trany. I'm getting a rebuild next month.

THEN, the plate goes forward, he he he.

 

[moparguy]

Once you open this can of worms, it's interesting getting em back in.

Since you're on a tight deadline with the trailer pickup in a couple of days, you'll have to make do with a few quick crutches.



First thing I'd do is pull the air filter housing and using a hole saw, make a few 2" or larger holes in the dirty side of the housing. You've gotta increase the air in order to burn the additional fuel. The stock housing is now a limiting factor. Also, pull the plastic boot between the housing and the fender opening.



Hook up to a trailer and take a test drive, you may have helped EGT's enough to get by, if you pay attention to things. If not, start sliding the plate back . 010" or . 020" at a time till things are manageable.



When you have time, do a search on Scott's air filter system, and Piers turbo's, his hybrid 35 might be enough for your needs. A phone call wouldn't be a bad idea to discuss your needs.



Also, check out Wildcat Diesel's site.



Good luck,

Ronnie

 

[paulsmith]

Peak boost, (Waste gate disabled) is close to 40 psi (I have a 30 psi gauge).



I slid the plate back . 050, (yes 50 thousands). Now boost is down to 30 psi, and egts are below 1200 unless, as was mentioned, I really wind out 3rd gear. Still pulls like a freight train, but the converter seems able to handle the load for now.





My trans is a stock unit of unknown miles (truck has 230,000) and was cooked pulling 15,000#, 13 ft high trailer, in a 30 mph head wind. I have full house DTT trans and converter on order now for 3 weeks. I hope to get it next week

 

[moparguy]

Paul, sounds like you've got things well in hand now. My mistake on the plate adjustment, I was really trying to lower those egt's .



You should still try the holes in the air filter housing suggestion. Everyone that has opened up the dirty side of the housing has seen a decrease in temps. Not enough to be the end all mod, but it helps. Were I in your shoes, I'd try Scott's new dual inlet system.

 

[Cooker]

I'm glad you got it figured out. It is amazing how much 50 thou effects EGT's.

 

[1dslram]

When you get a chance purchase a HX40 compressor housing and pin wheel, you will think you have a new turbo for $200-250 it makes a huge difference. The Scotty II is also a good investment for helping lower EGTs. If you cut the holes in the stock air box at least cut the 4 1/2" hole as for the Scotty II to blow cool air at the box to offset the hot under hood air that is of no help.

Bruce