Higher EGTs with AFE, ATS Manifold, 4" Pipe and 66/14cm Turbo?

[bzingre]

I've been reading posts that talk about lower EGTs from more airflow. Well, I've replaced the stock turbo with an 66 intake / 14 exhaust from River City Turbo, Little Rock Arkansas. In addition, there is a 4" straight pipe, ATS Manifold, AFE II, and and Edge Juice w/ Attitude. I did these upgrades all at the same time.



Previously, with the stock Turbo, Manifold, and EZ, my EGTs normal flat cruise were between 450 and 550* post turbo. Normal cruise around 10-15 psi boost. The highest I ever saw was 1100* post and 38 psi on the dyno on a 90+ degree day. BTW when Edge says 70 at the rear wheels, they mean it because I layed down 325hp and about 750 lbft with just the EZ and exhaust.



Now with the the new stuff, normal driving is around 700-850* pre and post turbo with about 100* spread from pre to post. This nets a 150* increase at cruise. I can hit 900* post without any problem on 3/3. Towing on level 2/4 at 20000+lbs I have never seen over 1300* pre turbo and about 1100 post. From what I can tell this setup with extra power helps the EGTs at higher boost levels only. Cruise boost is about 4-10 psi. While loaded in a pull boost can be 15-30+psi. All in all, this setup didn't lower my EGTs for normal driving, rather these mods increased them. Does this make sense to anyone? Did I do something wrong? Or, am I just blowin smoke :-laf ?

 

[JVolpe]

Well I see about the same as you. My cruising EGTs are up around 100* or more easy. Boost cruising is around 1/2 what it was with the stock turbo. It does kind of make sense. Bigger turbo needs more fuel to spool and cruising just don't need more fuel to maintain speed.

 

[JStieger]

Does this make sense to anyone? Did I do something wrong? Or, am I just blowin smoke :-laf ?

Yes. No. Possibly. :-laf



I noticed the same as you when switching from stock through various turbos to what I have now. Cruise EGT and boost all lower, but upper end EGT lower with higher boost.



I did the ATS manifold swap separate (after HTB2 62/12 turbo and chips) and at the time it gave interesting results with a bit lower cruise boost (less resistance/drive pressure due to moving the exhaust gasses out better) and slightly/barely higher cruise EGT. However, in the ramp up to WOT boost came back up and EGT slightly lower than before manifold swap.

 

[tobaccogrower]

more boost = lower exhaust temps. like JVolpe said, crusing temps should be higher if there is no load on the motor. the turbo dosnt and wont produce a ton of boost if your empty. espically if you have a big 66! put a load behind you and see how it performes. i had a stock turbo and edge ez with edm injectors. towing my 30 foot boat i could bury the pyro in a instant! switched turbo to a sps64 and ditched the ez for a ramifier. now towing my boat i will only touch 1400* pre turbo! thats when i have my foot to the floor! when im empty my temps seem to be up a bit and my boost lower then with the stock. hope this helped... . james

 

[jwilliams3]

Cruising temps go up with the big turbos.

What you are experiencing is totally normal and you have done nothing wrong.

If you want lower cruising temps go back to a stock turbo.



A huge turbo which you are running is going to be inefficient when not being worked.



A 66mm turbo is good for performance.



Its like having a 600hp gas camaro. It sure don't like to idle long but when you stomp it, it GETS IT!!