OP, any reason you went with the traditional MAP O2 housing as opposed to the MAP external dump?

 

Mainly because I'm not sure I'd like the extra noise it gives off

And then of course its 300+ dollars so it was an easy choice for me personally

 

Fair enough... I'm about a month away from my EF3 build and one of the last parts I need is an O2 housing. I had a Megan, but sold it for an external dump. I'm not completely convinced I want the external dump though.

 

sooo whats the outcome.. dying to see the dyno sheet

 

agreed!!!

 

Wow, okay first of all, what a day!! Ive been constantly talking to people locally and nationally who have been following this turbo. I had no idea there was this many people interested haha. Glad I could be the first to push the **** out of it. As we went through the tuning process Ron (My tuner, RS Motors) thought initially the turbo had freakish spool but the turbo wouldnt spike boost, Ron wanted to try and get it to spike so we could bring the tq/hp on a little earlier but the turbo seemed to be fighting itself. Being that it uses the EF2 turbine wheel and EF3 compressor wheel there is no reason to doubt that theory. I opted to use a Grimmspeed EBC on this round and I'm glad we did. Ron said without it we wouldve been fighting boost taper the whole time, but with the EBC Ron was able to make it do what he wanted. It did make outstanding power as you can see below. We hit 456/407 but were running out of fuel, so we backed off (E65 is what the Zeitronix was reading). The turbo just kept making power. Ron told me to get a BAP or double pumper haha, I told him were good for now. I was a little upset it didnt spool better but the topend is nothing to shake your head at. I'll admit I was fairly skeptical after looking at the dynograph what the car was going to drive like/feel like. Truth be told the graph does NOT do the turbo justice. This damn thing spools so much better than the EF3 its stupid. Finally while just driving normal I can feel the turbo kicking in and pulling me back, my EF3 didnt do that unless I was giving her hell. The turbo has its flaws as stated above, but we dont live in a perfect world either, with that said I couldnt be happier with this setup. It pulls so hard down low and up top I just smiled like a little girl the whole 90 min drive home haha. A huge thank you to MAP is in order here and to Ron as well, he simply has the touch. He amazes me everytime I get to watch him tune.

EF2.5 @ 31psi



EF2.5 @ 29psi (where we left car at)



EF2.5 vs EF3 (also this graph reads low from the EF3, I had a boost leak that day, we ended up at 425/360, still shows the comparisons) I'll have to get Ron to post an overlay of the EF2.5 vs EF2. I felt bad I was printing off so many graphs.

 

AWESOME!!!!!! Look at how much faster it spools than the EF3! I realize this is a lower reading Mustang dyno but wow, results speak for themselves. This thing is a beast!

I should have mine on and tuning in a week. Thanks for the results, man.

 

you mean 200 RPM faster over an EF3 that had a boost leak, was boosting 5-6 pounds less, and in a slower spooling anti-surge housing? I think you need to look at it again, it really does spool similar to an ef3.... 25 psi @ 4300 ish RPM. All things being considered it's only slightly faster from what I see and the EF2 turbine will most likely get seriously get out gunned in the higher boost levels vs the TD06H turbine.

 

nice numbers. Glad to hear you are happy with your build.... I am curious if you would have felt the same way if you had the boost leak on the EF3 fixed, and tuned at 31 psi like your 2.5?

Do you have any graphs comparing them at the same boost level? I appreciate you posting this info.

 

Yeah we printed off the wrong that day, I'll get an overlay of the EF3 @26psi vs EF2.5

Honestly this turbo spools way faster then the EF3. Like i said in my jibberjabber above the graph doesnt do this turbo justice.

 

Well 200 RPM is certainly noticeable and I certainly don't doubt that in the leasts and not to mention you are making much more power from the higher boost levels. Certainly sounds like you are happy with your setup and 460WHP on a mustang dyno is certainly nothing to laugh at. Don't get me wrong I certainly don't consider the EF2.5 to under-perform per-say. The smaller EF2 turbine really seems to rob very little power in the 25-30 PSI range in the higher RPM bad and that was actually a pleasant surprise. I am just curious if all things being equal how much better the EF3 would have been. For instance where was your boost leak at and how big was it? Did you ever figure it out? Also would have been nice to compare them with the same compressor housings and the same boost as pointed out in my previous post thats all. Sounds like a fun car for sure and you have certainly proven the EF2.5 can make good numbers. I am just trying to gauge how much your variables between the two setups are really affecting your comparisons. An educated guess tells me with all things being the same I think the EF2.5 and the Ef3 would be very close. The EF2.5 with the slight edge in spool, and the EF3 with the slight edge in power at your boost levels. Thanks again for the info.

 

I'm going to do a virtual dyno run starting at 2500rpm pretty soon here to see if it helps shift the power curve left, im not sure if tuner starts his runs slowly at 2500 instead of going all out. The dyno could be loaded differently too because i looked at my stock evo 8 turbo graph and it spooled just a little earlier than this turbo and we all know a stock turbo spools stupid fast

 

Edited an inadvertently repeated post (see below). Sorry.

 

What actuator do you have fitted to the turbo? Is it the MAP/turbosmart piece? If so, what spring is installed inside the WGA? Did you establish what level of spring pressure the actuator is exerting on the flapper valve by running the gate straight off the compressor nipple?

It is quite possible that with the smaller hotside there is higher exhaust pressure at the valve seat that is lifting the flapper earlier which would help exlain your not seeing 25# till over 4000 RPM. It is easier to tune around low spring pressure with an EBC. In fact, an EBC helps the tuner mask early flapper lift by delaying the manifold boost pressure signal via pulse modulations.

Peak boost and peak power on the dyno are about the same with an EBC controlling (masking) early lift as it would be by more heavily preloading the gate and just allowing the EBC to more narrowly control boost only near peak (24# and up).....But, spoolup and midrange torque is killed with low spring pressure simply because the EBC pulsations and pressure diversion at the diaphragm cant overcome higher(2:1) exhaust pressure at the flapper valve seat.

You need to increase WG spring pressure or you wont ever get that turbo to spool the way that it should regardless of what your tuner says. For 27-30# peak I advise the FP 18# actuator with 4 threads cut off the tip. Preload it to 24-25 spring pressure. This way you will find out how quick the 2.5 is actually capable of spooling.

 

Thanks for the input sir. I'll wait for disgustipatedm3 results and see if were similar or far apart in results. We'll have to change a few things maybe and see if that helps spool up.

We have the MAP/Turbosmart actuator on the turbo with the 18psi spring in.