I have new ef2. Should I talk to map about upgrading to ef2.5? I hope to stay on stock block. (Evo8)

Car has gsc s2 and br race fmic.


I'll also be running ef2 on 07 Sti engine. ( wonder how that will compare)

 

I understand what your saying but unless your racing from a dead stop, at a light or at the track, with no launch I can see where the "lag" could get you. But at the same time does it really matter if the lag is there being if the car is built right for drag lets say where the top end is gonna matter now how slow the turbo will get you off the line. Even if your road racing or auto x where your racing against time, that lag really isn't gonna matter. I can guarantee you that a 500 rpm difference in spool will not affect much time at all as long as you have mid range or top end in either situation.

 

Apples to oranges being doesn't the 07 sti have a 2.5 motor in it?

 

Spun through 1st and 2nd last night not a bad turbo

 

that makes my jeans tight. I'm excited to see what the EF3 will do

 

What tires and what size?

 

I'm not trying to bash the EF2 and EF2.5, because when some money frees up i was planning on getting one. But..

An EVO 9 with a nice set of cams and decent intercooler on a stock IX turbo can put out 420whp on e85 @ 30psi.

Why even bother?

 

Look your a drag guy I get it. However in competitive autocross and gymkhana classes, even hundreds or thousands of a second can mean the difference between winning and losing and your 500 RPM of lag can certainly cause that. Peak power doesn't mean anything on an autocross/gymkhana course.

Personally I just don't like the lag around town. I don't like waiting for it. I am seriously impatient. If I want to make more power for whatever reason I will just use spray. Not a big deal IMO. I don't understand why people are so against nitrous. It is the best power adder pound for pound (used to run lots and lots of nitrous in my NA builds...love the stuff)

 

From what I have seen on average the EF2 makes 20-30 WHP more throughout the majority of the RPM band, and holds power much better than a stock 9 turbo at high RPM. The EF2 has made high 400 numbers FYI.
Alot of people might think the EF2 isn't worth it for the price tag. For the drag guys I can understand that and respect anyone who feels that way. To each their own. However looking beyond the peak numbers, the power delivery is awesome. A great street turbo and prolly the most fun to drive IMO but I love torque ya know.

Truth be told I am torn between the FP Green and the EF2 and when I get ready to choose it's going to be a tough day.

 

420whp, sure dynojet numbers. But I have seen EF2's make 480whp on corn and I am sure EF2.5's can crack 500whp on a dynojet with the right setup.

The 9 turbo doesn't flow as much.

 

It has been done

 

I have rsti and evo 8. Both have new ef2 waiting to be installed. I know that rsti will make less power. Just can't decide if I should have went with larger turbo on the evo. 2.5 or even 3

 

Poopy falkens and still oem size

EF2.5 sir

See my setup, easily would crack 500whp on dynojet. STOCK MOTOR. Imagine on a 2.3 or 2.4

 

I think wg preload accounts for a lot of how responsive/laggy a turbo feels, no point in comparing turbos response if the preload doesn´t give about the same base boost. Many of the early EF´s suffered from badly adjusted wg preloads and some may still do.

 

I have Evotuners old EF3 turbo installed on my IX. I did preload the wastegate 1 more turn but it did have some preload on it. I ran the turbo off of the wastegate pressure and it only got 16psi so maybe that has something to do with it, but the turbo spools exactly the same on my car as it did on his, full spool around 4400, So I don't think its anything wrong with his car.