Engine/Transmission (1998.5 - 2002) More Boost or not?

[GILLES]

Hi Guys, I just got my 4'' exhaust and K&N air filter installed. 275 Injectors should be in next week. Do I need more boost, and/or boost fooler? This is the only mod. I will be doing for this year. Are the injectors going to set any codes?



1998. 5 24 valve, 4x4, auto, shift kit, fuel pressur, 4''exhaust, K&N, 3rd LP!

 

[Bob Wagner]

you will have no problems with running 275's without a boost module.

 

[CFAR]

Do you have a Pyro?



Do you tow heavy?



Up long hills?

 

[Hohn]

Think about this. The stock engine is set for maximum boost of 19-20psi. If you exceed this, you will set a code.



275's flow more fuel, thus more heat, and more boost. If you tow heavy enough to where you would have been pushing 19-20psi before, you will DEFINITELY set a code with 275s. Even STOCK injectors flow enough fuel to hit 26 psi (with a boost fooler and elbow).



I would suggest a timing box before injectors. Get a DDTTPM or a VA and THEN get some injectors-- then you don't have to waste money on a standalone boost fooler, and you can run any injector you want.



Justin



EDIT: Bob, this isn't a stab at you or anything, I just can't see how 275s would be totally safe. Is there that much of a buffer on boost there? I could be out of my league on this one... .

 

[GILLES]

This is a great web site. Different opinions, ideals. All makes perfect sense. Thanks alot guys.

 

[CFAR]

Ok we need someone to chime in here, an expert that can tells us which of the two following statements are true/false.





1. As long as you don't disable your wastegate which is set to ~20 psi or put in a boost elbow, you should not set any codes with larger injectors.



2. Putting in bigger injectors will flow more fuel, thus more heat, and more boost.





I think #1 is true, I ran Bully Dog III's for about 9 months without an overboost code.

 

[Hohn]

Originally posted by CFAR

Ok we need someone to chime in here, an expert that can tells us which of the two following statements are true/false.





1. As long as you don't disable your wastegate which is set to ~20 psi or put in a boost elbow, you should not set any codes with larger injectors.



2. Putting in bigger injectors will flow more fuel, thus more heat, and more boost.





I think #1 is true, I ran Bully Dog III's for about 9 months without an overboost code.

Iam no expert, but I think BOTH are true-- thanks for getting me thinking. HOwever, #2 is only true if you are making more heat than the WG can bleed off.



DUH!! This is all making sense... . There is a REASON that you don't need a boost fooler with DD1s and/or 275s. You WILL run a little warmer, but you won't overboost... .



Thanks for kicking my brain in gear-- I don't know where it was when I posted my earlier.....



Justin

 

[RustyJC]

I know this thread originated for an ETC, but in case anyone might read it and think that it applies "across the board", my stock ETH would hit 1300 degF pre-turbo EGT's when towing our 13,500 lb 36' 5th wheel RV. Therefore, I would be extremely hesitant to add larger injectors to an ETH without increasing boost levels (actually, airflow) to hold down EGT's. When I added the EZ with its boost elbow (unfortunately, I added a 4" exhaust at the same time, so I can't quantify the relative contribution of each change), maximum EGT's dropped from 1300 degF to 1100 degF as maximum boost increased from 22 psig to 30 psig.



Rusty

 

[Dkevdog]

I know for a fact that opinion #1 is true- I set overboost codes with my 01' HO with 275's and a boost elbow.



Kev

 

[RustyJC]

Originally posted by CFAR

1. As long as you don't disable your wastegate which is set to ~20 psi or put in a boost elbow, you should not set any codes with larger injectors.

Kev,



In light of the above, I think the question is, "Would you have set any codes if you had not installed the boost elbow?" What this really gets down to is, "Can the wastegate handle the extra exhaust flow to maintain its maximum boost setpoint to avoid setting an overboost code?"



Rusty

 

[CFAR]

RustyJC



I was lucky in that I was Mass at the time and didn't need to tow anything, I wouldn't try to tow with III's without some type of boost elbow. I had a comp but was waiting for the SB FE before hooking it up. I hooked up the comp as an EZ about a week before the FE, before I could slip the clutch at low rpms in 5th and 6th. after I could slip the clutch at 80mph.

With III's and a K&N I didn't see temps above 1200* not towing of course, at basically sea level without the elbow.

Now I would be hesitant to tow heavy 12-13k (legal heavy) without a pyro, especially if you tow at elevation. Before I left Mass towing my 8'x16' enclosed cargo (approx 17k gross) my turbo was a beautiful silver color, now its an ugly light brown. Hit 1300 a couple of times could have gone higher but I like to keep it down below 1250 so I can take my eyes off the pyro and keep them on the road.



lol

 

[OTRPU]

Hi all, I haven't a clue as to what all you're talking about, but I'm seeing stuff that scares me some. I'll list what I've got, then maybe someone will tell me what I need. One of those aFe filters, 60hp Edge card, 80hp injectors, and the ATS 3 piece manifold. Also have ATS stage IV and TripleLoc w/Commander. With hardly any weight at all, and in fact I think even MT I can scream past 1,300* EGT. Loaded with a stack of gooses I-70W through Kansas I backed outta it when I noticed it passing 1,500*. Boost went to 31 or 32. My personal unscientific evaluation of what's going on is: I've got it breathin, I'm givin it fuel. . . but it ain't gettin out the back end very well. Having Reliance Truck & Auto throw in a 4" system right now. Is that about all I should be needing to do? I ain't really interested in pegging the speedo, just want to run up the hills with my loads doing the posted limits without turning the pistons to liquid.



Tow Safe,

Steve J.

 

[marksmith]

Steve I am going to take a stab at this. I believe you have an HY35 turbo. I dont believe that with an edge and 80hp injectors you are getting enough air in. Yes she is pumping but not enough. The stock exhaust is supposed to be good for upwards of 350HP (Someone PLEASE correct me if I'm wrong) Dont get me wrong the 4" exhaust is a great investment and will help some but I think a different turbo is where you will see the gains at.



Hope this helps

Mark



PS I didnt see if you have the waste gate J-hooked or not. What is your boost pressure? Do you have the WG disabled or adjusted up to a higher pressure?

 

[jrandol]

I ran 275's for 6 months of hard use. Did not need a boost fooler or anything of the nature. You'll be fine, I know from experience



Jeff

 

[Steve Campbell]

What jrandol says is true.....

but you will not get all that you pay for in extra horsepower/torque if you do not put a boost fooler and w/g elbow on.

 

[CFAR]

I think marksmith hit the nail on the head. Hy-35 has a 9cm housing on it if I remember correctly compared to the 12cm on the the HX-35.



New Turbo?



You always pay... ... ... one way or the other!!!!

 

[OTRPU]

Like I said, I ain't gotta clue. . . and I'm getting older, memory seems to be down to about what happened yesterday. I think I've seen 36 lbs boost. I don't know nuttin about "elbows" or "foolers", or even turbos. Know what turbos do, but that's about all. Who sells this "New Turbo" and whatever else crap I need either used or for the cheapest cost? My normal "DOCs" will match or beat when I show them what I'm after. Wanna get this crap done and be done with it so I can get back on the road and earn a livin. Don't need another "Project" vehicle that goes on forever. . . got one of those sittin in my garage, been there since it was new, in 1975. Coulda bought houses with what I dumped in that bucket. And I still need a hauler body and STACKS.



Cheers, Steve J.

 

[RustyJC]

Originally posted by OTRPU

And I still need a hauler bed and STACKS.

Steve,



I can't help you with the stacks, but how about #ad
.



Rusty

 

[OTRPU]

BINGO!! It's just beautiful. . . I'm afraid to ask, how much? Is it Steel, aluminum or glass? Trouble is the guys sellin um think they're made outta gold. Whatever it is, what's the weight? With just alittle imagination I can see that body behind this sleeper. What's the cab to axle distance? That's a B&W right? Same guys that started the turn over ball gooseneck? It's not a Highwayman, but looks like it would do the job just fine. World won't be right till I get some kinda hauler bed on it. What the hell, I'm kidding myself. . . it is another "Project Vehicle".



#ad




Tow Safe,

Steve J.

 

[RustyJC]

Steve,



Right, it's made by B&W, the same people that make the turnoverball gooseneck with the companion 5th wheel RV hitch. You can contact them HERE. They can build it however you want it.



I agree with you - I drool every time I see that bed. If I ever bought a FL Freightliner or a 330 Pete to tow our RV, I'd have them make the bed for it.



(Edit: I apologize for hijacking the thread - I'll shut up now. )



Rusty