I find stock ports always yield the fastest boost response on small to medium frame turbos. This is everything less than 62mm(8374 for example). Shawn here ran the 8374 iwg on stock ports and his car made 31 psi by 3400rpms. Even Borgwarner was impressed when they came out to visit us...

 

Interesting. I've seen others claim that a street port hurts spool/response over the stock port. I wonder if this all comes down to the design of the port.

 

you need to look at each turbo separately.

the EFR turbo's are amazing because they have such a lightweight low MOI turbine wheel. These turbine wheels will spool up excellent and will beat anything else that has an inconel turbine wheel, even smaller turbines.

The A/R on the turbo must also be viewed with the size of the turbine wheel. you can run a smallish turbine housing with a large turbine wheel and have zero problems choking anything, or you can run a larger turbine housing on a small turbine wheel and choke the hell out of the engine.

for instance a .92 A/R 9180 outflows a housing of 1.45 A/R with a 7670 (if they made it).


so when looking at turbo's you need to view them as a system, not as individual components.

The IWG models do so well in the spool department because they have no interruptions of flow for the manifold, all heat/flow goes through the turbine wheel with a small divided IWG which is designed very well. Most EWG systems have a ton of volume to fill and lots of interruptions.

either way, an ewg 1.05 8374 is an awesome turbo and will out spool most other turbo's you throw it anywhere near its size.

 

Sounds great! Do you happen to know what the specs was of this turbo and was he running pump w/meth or e85?


Thanks for the clarification..
I looked at the hotside of the turbo and tried to pair it with the ports of the engine.. always thought 1.00 was more ported engine whereas .80-.90 was a better fit more for stock ports.
That's why i was afraid the 1.05 of the 8374 was a bit big.

He sent me the specs on his turbo it's brand new and never used..


Does anybody have info about this particular turbo on a stockport engine running pump? even though i'm convinced this is great turbo i would like to know what i could expect from it. It's a lot of money to spend on just a turbo so i want to be sure i'm making the right decision.

Thanks

 

Dropped the ball on the EFR.. First EFR FD in the netherlands is on its way!

Another question, Would this turbo benefit from a 3,5" system over a 3" and if so what difference would this make?

 

guys what benefit would i have with a 3,5"system over a 3"?

 

I've found that unless you are over 500 wheel hp, 3" is sufficient on a 2 rotor. A 3.5" turbo back exhaust will be significantly louder.

 

i will be shooting for 500 or more on the EFR 8374 maybe it's best to go with the 3,5" from the start.. Or can i use a 3,5" DP that tapers down to 3", are there any drawbacks if i go with this solution?

I don't mind the car beeing load i wont be daily driving it anyway..

 

You can do 3.5" from the turbo then taper it down to 3" at the midpipe.