What is the difference between the two? If the 35 has the 40s compressor on it wouldnt it flow as much as a full 40? WOuld the 35/40 spool quicker because of the smaller housing? Im askin because i just got my hybrid installed and it didnt help anything other than it spools like it was stock again, and I dunno if thats even a good thing. My egts rise faster and higher than before. HTT said it would support around 400+ hp and I know I am not near that number yet, and im guessin I dont need a 40 because egts wernt as bad as they are now with the hybrid. I was thinking that the temps were higher because I dont have enough fuel to push it? Or it there something else I havent thought of?

 

The 40 has a larger turbine wheel, which allows it to flow a lot more air. So, a 35/40 is more restrictive on the exhaust. This is also why the hybrid is sturdier-- the smaller wheel creates less shaft stress (35 and 40 share the same shaft).

A 35/40 will be a lot more restrictive than a full 40, EVEN WITH THE SAME SIZE turbine housing! That's because a 16 housing on a 40 flows a lot more than a 16 housing on a 35. Remember, the 35's smaller wheel is a restriction that ALL the exhaust must pass through (assuming closed wastegate).

There's probably something wrong with your install-- boost leak, or something. A 35/40 with a 14wg housing, should comfortably support 400hp.

jlh

 

If I have a boost leak how would I go about fixin it? If not could it be that I need more fuel to spool it?

 

Hey Kroner, nearly neighbors here. You may have a boost leak. But I seriously doubt you lack the fuel to spin it. Do you have guages? What kind of boost #s are you seeing?
You can make a simple boost system tester to test for leaks. Not that hard to do and I still have the parts to do most of it. I would recomend running some kind of a plate rather than no plate. This seems to dump fuel in with no regard to boost, rpm or actual need. This could be a reason your EGTs are running high.
Who did your work in town?

 

Ive done most of the work myself but Zips equipment swaped the turbo for me. The turbo makes 40 psi at wot. What would I need to make a boost leak tester?

 

if you are running plateless you need a alot of timing to burn the fuel. i would say 20 degrees or more.

 

can I do timing myself or should I take it somewhere? Should I bump it higher than 20 because im planing on running some 370s later? WIll it hurt the headgasket.

 

I would recomend stopping by Kolb diesel down on Fares and having a talk with Glen or Murl. They do some good work there and can answer any questions you may have. They can also explain and show you why it would be better to run a plate in your pump. I know they have been a great help to me over the years and I had never bought anything from them until last year.
If you're getting 40 lbs of boost i would think you don't have a boost leak issue.