people with an Evo 3 internally gated

[eclipsemustang]

I was just wondering how many people with Evo 3 have the stock 31mm flapper and boost over 18-20 Psi and see no boost creep. with porting or not.

 

[kahl23]

Ported turbine housing, 2.5inch turbo back, no creep. I think that this is mostly due to the increased back pressure of the 2.5 vs the 3.0, but I don't feel at all like this limited power too seriously.

 

[tbonitz301]

Hey kahl23. Do you think i will have any creep? I just purchsed an EVOIII GT with a 34mm ss flapper, and i have a 3" turbo back

 

[gsx rated98]

I didn't port mine at all, and it crept up to 26lbs. I just tuned the car accordingly. Maybe not the best way to of done it but it worked well for me.

 

[eclipsemustang]

i was just seeing because i plan on porting it but i saw in one post that if you boosted somewhere in the 18- and up Psi range you might not see it? just seeing how often that theory was true.

 

[kahl23]

Hey kahl23. Do you think i will have any creep? I just purchsed an EVOIII GT with a 34mm ss flapper, and i have a 3" turbo back

Well I really couldn't tell you for sure for 2 reasons:

1. You're running the evoIII GT whereas I had the MHI evo3. They're probably incredibly close anyway but I still don't really know that turbo too well.

2. You have a 34mm flapper where I had a standard 31mm.


However, my gut says you should be fine. Between the porting on the evo3 (listed in profile) and the 34mm flapper, that should be enough to combat creep. One thing to look for, however, is that I heard some people at the track talking about how their 34mm flapper would occasionally blow open, just something to be on the lookout for. Good luck!

 

[ndsti]

Porting the turbo, installing a 34mm valve and porting hole accordingly, running at higher boost above 16 psi and with a 3" exhaust you should not see boost creep.

 

[Ginglingston11]

Well I really couldn't tell you for sure for 2 reasons:

1. You're running the evoIII GT whereas I had the MHI evo3. They're probably incredibly close anyway but I still don't really know that turbo too well.

2. You have a 34mm flapper where I had a standard 31mm.


However, my gut says you should be fine. Between the porting on the evo3 (listed in profile) and the 34mm flapper, that should be enough to combat creep. One thing to look for, however, is that I heard some people at the track talking about how their 34mm flapper would occasionally blow open, just something to be on the lookout for. Good luck!

thats weird...ive never heard that before...do you think its because of the larger flapper or the stock wastegate actuator?

 

[kahl23]

I'm actually not sure, I was told this by Kevin Jewer (95GSXRACER here, but hes not on all that much), and as far as I'm concerned if he says something I tend to listen to it. However, I think it might be a combination of more stress due to the larger flapper and an actuator not designed for the added strain. Just theory though.

 

[16gpoweredgsx]

Usually you only get creep when you try to run low boost. 20 psi is where mine used to creep up to, when I have the car on low boost, then I ported the exhaust housing and now I don't get creep at all.

 

[Nanan]

Unported my Evo3 would creep up to 24psi when WOT from 5000 to 6500, after porting it would only creep up to 18psi in the same range.

I am rather disappointed with this turbo(spool isn't any better then the 18g my friend has, and it drops off in pressure from 6500+), I wish I would of just spent the cash to get one of those ball bearing 50 trim hybrid turbo's.

 

[compression]

i was very impressed with my evo 3 16g. i actually borrowed a frieneds t3 50 trim setup for a track day and i couldnt wait to get my turbo back on, i ported my turbo myself but i did not port the wastegate portion. as i was wanting to run in the higher 20 psi range anyways, however when i did set it on low it would creep to about 23 psi by 6500 rpms which i didnt mind because i have the supporting mods but if i set it for about 20 ish it wouldnt creep hardly at all, plus it just feels so awesome with a steady creep from 15-23 psi just keeps pulling and pulling. ha evo 3 16g rocks probably one of the best street turbo's imo.

edit: i had the std 31mm flapper

 

[matthewdesigns]

I have a MHI E316g, no porting, and the stock flapper. Also have a 2.5" tubular recirc'd o2 housing, 3" dp with an electric cutout, no cat, and stock catback. I get absolutely no creep and I have it set at 21psi. This is with the cutout open and closed. I get a spike to 22psi when the turbo hits, but it settles at 21psi and stays there till I shift.

 

[eclipsemustang]

thanks for the replies this helps my decision on what kind of wastegate to go with. looks like ill just stick with the 31mm and port it, than try to set it at about 18Psi than see if it creeps hopefully not, but if it does plan B is boost at 20 some Psi. I just got a walbro 190 and some 650's so that should be able to handle that level right?

 

[kahl23]

With a 190 and 650s you should be good to go. You probably want to rewire that sucker though, if you search "fuel pump rewire" I'm sure you'll find more than enough information on it.

 

[97gstjosh]

Just rewire it. Im running 680cc and a rewired 190 and its holding up fine
Hope that setup works out for you. I love my EvoIII 16g, mines ext. gated though.

 

[spyderturbo007]

I would never recommend the larger flapper, unless you don't plan on ever running high boost. The upgraded flapper is a great idea if you plan on running low boost all the time, but when you start cranking down on the MBC, you're going to blow the flapper open.

Keep in mind that force is pressure X area. By increasing the size of the flapper, you're going to increase the applied force to the wastegate and cause the flapper to blow open.

I don't creep at all, but then again, I'm running 22psi.

As for the 650's and 190lph fuel pump.....you'll be fine at that boost. You do need to get a logger before you blow something up. I would also recommend an UICP since I didn't see one in your profile. I netted about 3.5lbs/min after installation, which far exceeded the 0lbs/min gain I received when upgrading the stock cat back.

Also, you are going to run into some heat soak problems with the SMIC running 20psi. I was able to get about 2 back to back pulls before I would start knocking. You'll either want MeOH injection or a FMIC to cure that problem.

 

[blownturbotsi]

On my old car, I ran ~21-22lbs with a 2g o2 and a 2.5 TBE with no creep. I never really had creep at all, no matter the boost. This was on a MHI E316G.

 

[eclipsemustang]

haha ya spyderturbo007, it kind of just clicked for me a few days ago that i would need UICP, i do have a greddy FMIC so heatsoaking shouldn't be a problem. and for the logger, the guy who does the dyno in my area said he would do all the tuning during my dyno runs, so should i still get a logger or would that be pointless?

 

[HighBoostLaser]

i like my evo 3 16g no creep at all on stock exhaust

 

[spyderturbo007]

so should i still get a logger or would that be pointless?

Personally, I would pick one up. If anything, just to keep an eye on things.

 

[eclipsemustang]

alright i probably will, i was just going to use the money for some ARP headstuds and head gasket, but my car wont be out of storage for probably 2-3 months so i got time to save some money.

 

[Kevin Jewer]

thats weird...ive never heard that before...do you think its because of the larger flapper or the stock wastegate actuator?

To answer this for the archives, it's due to the increased area of the flapper. This assumes that the hole was ported out to match. Pressure x area = force. A flapper with more area will have a greater force acting on it at the same turbine housing pressure. They blow open and limit your max boost. I posted about the effects of this on this site, but you'll have to search back 4 or 5 years.

 

[DSMunknown]

^ I just came over your thread last week. Not too hard to find; it's the only thread you've started on Tuners thus far.