bluecollarpilot
Veteran Member
What is a reasonable EGT value for RC4 with pp502 and VNT17 with an FMIC going approximately 70 mph.
Anyone?
Anyone?
I think this is about i right, from 50-90 mph anyways. A/C raises mine at least 50° when its hot out. Ambient temp. will make a difference as well, moreso if you have a stock intercooler. FMIC probably not so much.Bob_Fout said:I typically see 600*F to 650*F with my setup.
With stock exhaust, you'd normally have 100*F for every 10 MPH at highway speeds in 5th, flat, little wind. 70 MPH = 700*F, 80 MPH = 800*F etc. With the opened up exhaust, it drops quite a bit. Those with bigger turbos could see an additional drop too.
Not sure really, I'll look tomorrow when I'm on my road trip. I'm thinking just a few PSI, 1 to 4?Deevo_3000 said:I think this is about i right, from 50-90 mph anyways. A/C raises mine at least 50° when its hot out. Ambient temp. will make a difference as well, moreso if you have a stock intercooler. FMIC probably not so much.
What level of boost do you see at 70mph with your setup?
I usually see about 6psi at 70mph on flat, its all in the tuning i guess.Bob_Fout said:Not sure really, I'll look tomorrow when I'm on my road trip. I'm thinking just a few PSI, 1 to 4?
I think the IQ setting plays a role too. For any given fuel demand, ECU "wants" to blow a certain amount of air thru there to keep the burn clean (and efficient). I believe ECU adjusts the boost level (air quantity) based on how much fuel the IP tells it is being injected... at least in situations like cruise where there's excess boost available. (Adjusting the air/fuel ratio affects EGT also.)Deevo_3000 said:I usually see about 6psi at 70mph on flat, its all in the tuning i guess.
EddyKilowatt said:I think the IQ setting plays a role too. For any given fuel demand, ECU "wants" to blow a certain amount of air thru there to keep the burn clean (and efficient). I believe ECU adjusts the boost level (air quantity) based on how much fuel the IP tells it is being injected... at least in situations like cruise where there's excess boost available. (Adjusting the air/fuel ratio affects EGT also.)
Still sorting this all out myself, tho. With stock injectors I had 650F and 3-4 psi at 70 mph; with PP520s and no IQ tweak that changed to 800F and 1-2 psi. After first IQ adjustment, I'm at 700F and 2-3 psi, and I'm planning further IQ increases which I expect to bring that EGT down further.
Eddy
Exactly. In fact it thinks it is injecting less, since it doesn't have to move the control collar in the IP as far to achieve the same power output (same 70 mph highway cruise speed). (Or in other words the bigger injectors are flowing the same fuel with less control collar movement.) So the ECU calls for less air (boost) to go with what it thinks is less fuel.Deevo_3000 said:If you changed to PP520 nozzles, the ECU has no idea its injecting more fuel, as far as its concerned you still have stock nozzles in.
Diesel is allways on Boost above 1300 RPMDeevo_3000 said:I usually see about 6psi at 70mph on flat, its all in the tuning i guess.
and all this is normal pressure....TDikook said:HOLY COW!!!! you see that little boost when cruising?? I see 11-14psi(as per scangauge) cuising with the CC on going 70-75. so yeah, I guess it IS all in the tune.
That's higher than most folks have reported. What does your Scangauge say the Load ("LOD") is while you're cruising and seeing 11-14 psi? And what are you using for your atmospheric correction to the Scangauge MAP reading?TDikook said:HOLY COW!!!! you see that little boost when cruising?? I see 11-14psi(as per scangauge) cuising with the CC on going 70-75. so yeah, I guess it IS all in the tune.
It's that damn KP-39...my new VNT-17/22 does 3-4 psi at cruise...TDikook said:HOLY COW!!!! you see that little boost when cruising?? I see 11-14psi(as per scangauge) cuising with the CC on going 70-75. so yeah, I guess it IS all in the tune.
TDikook said:HOLY COW!!!! you see that little boost when cruising?? I see 11-14psi(as per scangauge) cuising with the CC on going 70-75. so yeah, I guess it IS all in the tune.
dieselpower04 said:It's that damn KP-39...my new VNT-17/22 does 3-4 psi at cruise...