Engine/Transmission (1998.5 - 2002) 3 inch to 4inch question

[Six_Man_Diesel]

Looking for people who have gone from 3 inch to 4 inch here. How much did it lower EGTS?? Gonna be building my own 4 inch system this next week, would like to know what to expect. Would 5 inch lower them even more??



Peace,

Willie

 

[JWatt]

Three to Four

Just installed 5" through out and no difference (still running stock hp). From what I have read, you will see the benefit when the boost jumps past the stock 20 psi mark and when a larger turbo is installed (larger hole for the heat to go). I don't yet have those installed, but hopefully the larger exhaust will come in handy when I do...

 

[pro99]

temp drop

I have a hx40 16 waste-gated with a 4 inch and with both of them seen a drop of 60 to 70 but can not say just with the 4 inch. I would have say about 20 to 30 from 3 to 4 inch It's not that much. There are other post on this and they say the same and then you got people saying 80 to a 100? But you you can't believe everything you read.

 

[RustyJC]

I installed a Jardine 4" exhaust and an Edge EZ (with boost elbow) on the same weekend. Maximum pre-turbo EGT's encountered when towing our 13,500 lb 36' 5th wheel RV dropped from 1300 degF to 1100 degF. Unfortunately, the 4" exhaust probably contributed very little to that - it's mostly due to the boost increase from 22 psig to 30 psig that resulted from the boost elbow installation.



Rusty

 

[OTRPU]

I for one am expecting a huge savings in EGTs going to 4 inch, if not, gonna be a boring ride up the mountain when loaded. With 14-15k at 75 have no trouble accidently cracking past 1. 5k EGT. Backing out of it and running a mild 60 I still had trouble staying under 1,250. DOC thinks the exhaust will do what I need. Haven't done no foolers or elbows or plates. Don't know nuttin bout um. Guess maybe I need to ask DOC some questions. Guess I need to update my sig to show the 75hp injectors also.



#ad




Tow Safe,

Steve J.

 

[RustyJC]

Steve,



If you're running bigger injectors with stock boost levels, the best thing you could do to lower EGT for minimum cost is to install a boost elbow and boost fooler. More air = lower EGT.



Edit: Oops - just saw you have an automatic. If you have an HY-35 turbo, you may have to turnbuckle the wastegate or put an empty 22 cartridge in the turbo hard line instead of using a boost elbow. You'll still need the boost fooler, though.



Rusty

 

[OTRPU]

Hi Rusty, thanks for info. I have an auto, but the HX35W Turbo. Will talk to DOC about the fooler and elbow.



Thanks,

Steve J.