Hi Everyone,

So I did a VD of my car and it seems to have very low torque. I did a boost leak test and found none.

I have no knock and I am curious on what else needs to be looked at in order to get the same power levels other EF4 turbo on a 2.0L are having (500whp up).

My setup is:

2.0L
GSC S2
Map EF4
93 Octane

Appreciate the help.

 

my suggestion new tune. Add more timing and lean out a tad from 4 to 6k but be careful it is on pump. Lean it out till you start seeing knock and back it off, then add a degree of timing till it does the same thing and back it off again

 

Thanks cursedsm, my timing may already be too aggressive but i'm not getting any knock. I'll add a few more degrees and see how it goes. Will lean out the fuel first.

 

if your already aggressive with timing then don't put any more in. I would lean out .xx at a time very very small increments till you start to get knock. you don't wanna go boom

 

Thanks I definitely don't want that to happen.

 

first things first -- dont mess with timing. Get your AFR's in line.. then mess with timing.

 

You have to remember your also on a 2.0, don't expect to much more tq out of it.

 

Thanks. I'll do some more research and see what other 2.0L with full bolt ons are getting on an EF4. I am just a bit disappointed at how the MAP EF4 is performing compared to what others are given the declared HP capability of the turbo.

 

I'm not a tuner, but I have an EF-4 and we are in the final stages of tuning it. My numbers are way higher on 91 Oct at 7000ft altitude.
I notice that your spool is not really that good. Mine hits 20psi at like 4.2-4.3k. Also looks like your boost falling off up top, mine stays pretty consistent. Are you running a 3 port? What manifold? When I first installed the turbo we had issues tuning, it felt like a boost leak, but we could not find one, we messed with the wastegate actuator to tighten it more, but that did not help either. It was hitting 20 psi at 5k or later and we were not hitting the numbers. MAP told me that 20psi at 5k was pretty good on a 2.0L, but my tuner had the same turbo on his Evo x in the past and called BS. Eventually I uninstalled it and sent it back to MAP. They checked it out and said the CHRA mounting surface had broken and caused the comp cover to touch the wheel. They said it was not covered under the warranty. I bought the turbo about 6 months before install and they said I must have dropped it hard enough to cause that damage. Turbo had no mark on it from such a traumatic drop though. I installed it myself and it was never dropped. Since it was shipped 6 months before there was no insurance claim to be made.

I really like MAP. They helped me out when their shorty manifold cracked after a year and they helped me out on getting the turbo rebuilt. I still had to pay $700 to get the turbo fixed and do the install twice, which I did myself, but otherwise that an extra 500 for labor. I'm 99% the damage occurred before the turbo reached my home, but I could not prove that. What rubbed me the wrong way, was being told that 20psi at 5k is pretty good spool on my car, which was just BS. And that was a statement by management. I like Chris Carey and he is a great guy from my contact with him, but to use my tuners words: "they are great turbos, when they work"

I'm really happy with my EF-4 at the moment, but I'm really curious to learn about what is causing your issues. Please update after you try tuning the issue out.

Not trying to bash MAP, I still order from them. Just telling my story.

 

If you look at his afr's they are way rich. Being rich would cause the turbo to spool late. When he gets them in line where they need to be it will pick up trust me. Another thing I can think of too is make sure your wga is properly tensioned on the turbo. I don't think that is the problem but just make sure it is properly on there and not blowing open. I know on my personal car the way it was tuned I made 562/438 on pump gas and pushed out the tq as far as I could to make it last on a stock block, with that said I made peek tq at like 6200 rpms. After I took it to have it retuned when I found out I had a bad clutch I made only 305 ft lbs at 5500 rpms. So get the afr's straightened around and it should come to life a bit more.

 

Don't be disappointed in the turbo be disappointed in the tuner we will get you squared away

 

Thanks for sharing your experience. I am also begining to think it is the turbo as I have another car that is only 1600cc and I get full boost on a bigger turbo at 3500 rpm.

I've checked everything even the tension on the wastegate, changed a lot in the tune and will try all the suggestions here to hopefully enjoy this setup.

 

Thank you for helping. I will find time this week to lean out the spool area and then put the AFR to 11.8 in the boost regions. Hopefully I'll pickup some spool time and hp from this.

Will post my results then.

 

On pump gas you should be around 11 afr that should be safe enough. That is where I am at on my car and it pulls like a freight train. If you wanted to compare here is my vd from back then. Note this is after I had a double pumper installed why afr is lean up top.

 

on your VD settings. Add your weight in the required table. Also verify you tire height size.