25psi on e316g

[95eclipseSlow]

What do i have to do to the internal wastegate on my evo3 16g in order to boost it to 25psi?

 

[95eclipseSlow]

i think its because 1st and 2nd gear are so short that there isnt enough time or load to spool 29psi. is this a correct assumption?

 

[AWD-TSI]

this is a vid i found crazy



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[95eclipseSlow]

wow so he has no mods to his WG?

 

[AWD-TSI]

im not sure if they do or not. i tried to look but couldn't find anything. but it is a cool video to watch and to see ### he E316G is capable of.

 

[Teflon]

I'm currently running a E316g on 26 pounds of boost with no modification to the wastegate at all. And it holds it through the rpm range only trickling to 25ish at redline.

 

[AWD-TSI]

ya im Running a oe E316G with no mod to the WG and i run 27 all day long.

 

[95eclipseSlow]

you hold 27psi all the way to redline? so now all i need are some new couplers and arp head studs. what about a hg?? not really needed? im going remove one stud at a time and replace it with the arp,

 

[AWD-TSI]

ya 27, but on cold days it spikes. I had the HKS head gasket on my car and no studs. ### HG is n the car currently?

 

[byebyev8]

I ran my wastegate shimmed with 1 washer and I'd hit 30+psi in 3rd 4th and 5th and 28-29 in 2nd. I really haven't noticed any boost fall off but I've only paid attention in 2nd gear and it normally holds at least 26psi at 7k. I blew 2 stock headgaskets though on 4th and 5th gear pulls because of the spikes. I'm only going to run 26-28psi from now on. This is on e85 with 115mph trapes in a full weight 2g.

 

[tkelly27]

Anyone ever tried a vacuum canister to hold the WG shut? Might help with the bigger flappers without going to a stiffer spring.

 

[pboglio]

Before cams, I could hold boost to redline. Start slapping in some high rpm horsepower making parts (cams, intake manifold, header exhaust manifold) and watch your boost plummet. And, there is a point where more boost is not good. My EVO3 16g on racegas likes 28 psi. Any higher and the turbine backpressure increases to the point where you can feel the car starting to slowing down, datalogs back up this fact. Trying to force every last ounce of exhaust thru the turbine section on this particular turbo isn't the best balance, some needs to bypass thru the wastegate just to keep exhaust backpressure in check. Same problem I had on my T28, 25 psi felt great, 27 psi in the midrange felt like ass, no knock or spark blow out in either case just that much higher boost. YMMV.

 

[jrohner]

Wierd my brother runs Greddy's ecu controlled boost with solinoid with all the cool features. It did nothing to hold boost. Just helped with spool since he can actually tune the boost curve. I dont see how electronic boost control would help it hold more boost when its a mechanical issue.

If you're just bleeding off pressure instead of blocking it (with a 3-port), yeah it won't hold boost very well.

 

[matthewdesigns]

Before cams, I could hold boost to redline. Start slapping in some high rpm horsepower making parts (cams, intake manifold, header exhaust manifold) and watch your boost plummet.

I just saw this on my own car, and not a bad thing IMHO, as long as airflow doesn't drop too. I knew cams would drop psi, but I just installed my Evo3 intake over the weekend and I am surprised to see that my boost falls off to 24psi now, whereas before the intake swap I could hold 26psi to redline. Didn't think the mani alone would do that.

 

[pboglio]

I typically pick up 1-2 psi on the topend when switching over to speed density and ditching the restrictive 2g MAF. My last attempt to run speed density on my EVO3 16g equaled FAIL. My VPC pressure transducer decided it was not liking life and reported 12 psi when I was at 28 psi. Fun, fun, fun when your car leans out so bad you lose 150 h.p.WTF Luckily race gas prevented the car from knocking and saved the motor.

So I could believe 24 psi at 7000 rpm on a completely dialed in setup on an EVO3 16g.

 

[jrohner]

ya im Running a oe E316G with no mod to the WG and i run 27 all day long.

If you're running stock cams that's likely possible.

 

[dsm-onster]

this is a vid i found crazy



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This guy is not an example for the masses. He's running no intercooler and the gain in flow really helps the motor keep the energy for the turbine wheel up. Also the compressor doesn't have to work as hard to make the same boost, so the energy required is less. e85 with meth injection is a sweet thing. But who does that

 

[Jeff99GS]

Port out the exhaust manifold and take your exhaust OFF.
With NO cat or muffler to get in the way you will build MORE boost. The max I would go on an Evo316g is 25 psi tho. Anymore than that and your just blowin hot air.

 

[toofast82]

I recently installed 264/272 cams and before the install my boost would hold pretty steady at 23-24psi. Now I notice it is dropping off to 20-21psi around redline. I'm also running a 38mm external gate, too. I have a BoostDC/RPM table in my computer file so I think i'm going to order a 3port solenoid and see if I can control the boost via the ecu and counter the dropoff.

 

[viperlp01]

I hold 25psi with zero mods to my wastegate... I have to pull 2 degrees of timing from 5k up though to prevent knock.. 11.2-11.4 a/fs.. BTW complete stock engine.. I have never had the head off.. could be the same head studs from 94(build date)

 

[Calan]

I recently installed 264/272 cams and before the install my boost would hold pretty steady at 23-24psi. Now I notice it is dropping off to 20-21psi around redline. I'm also running a 38mm external gate, too. I have a BoostDC/RPM table in my computer file so I think i'm going to order a 3port solenoid and see if I can control the boost via the ecu and counter the dropoff.

I bet you're flowing the same or slightly more air at the lower PSI though, which is a good thing.

Would be interesting to see the comparison if you have airflow logged before and after. I'm kinda curious to see how your VE changed.

 

[JayRolla]

Too all the people saying they hold 27+psi to redline in 3rd gear should post up logs to prove it. I just dont see it happening in 3rd gear at 7krpms. I have stock cams and mine still dont hold boost that well. Ive seen people with welded wastegates and they still drop boost of at redline.

 

[dsm-onster]

Well you ARE at a higher elevation which makes the turbo have to work harder to see the same boost for you than for someone at 500ft. . . Definately not negating the value of said proof. It's is pretty uncommon. Especially with a simple cam upgrade as you allude.

 

[Calan]

FWIW, here is a typical log with my E316g at 25psi. This was with a 264/272 combo, and ported hotside, O2, and EM. This is at a little over 1000ft ASL, and usually between 65* and 85* outside air temps. This is also on a modified WGA with a heavier and pre-loaded spring, and extended throw to help with creep at lower boost settings. (When set to 18psi initial boost, I usually had a pretty flat curve between 18 and 20 psi).

This is very typical of all pulls I made. I almost always had a gradual fall-off to around 20-21psi at redline, flowing about 35-37 lb/min. This was usually with mild WAI and my 650's screaming at around 95-98% IDC's.

BTW - The initial peak boost in the graph below is 24.9 psi. And as you can see, I had a minor MAF issue from time to time

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[toofast82]

I bet you're flowing the same or slightly more air at the lower PSI though, which is a good thing.

Would be interesting to see the comparison if you have airflow logged before and after. I'm kinda curious to see how your VE changed.

Unfortunately, I don't have any means to log airflow due to the fact I use speed density and log with MMSD(MMCD SD variant) so there is not HZ or lb/min flow like Link. I did have to add fuel to my VE tables from 5500rpm+ if I recall correctly to get my A/Fs back where they were.

 

[JayRolla]

Well you ARE at a higher elevation which makes the turbo have to work harder to see the same boost for you than for someone at 500ft. . . Definately not negating the value of said proof. It's is pretty uncommon. Especially with a simple cam upgrade as you allude.

Darn it, thats like the third time you pointed that out to me and I keep forgetting it.

I see you are holding 25psi pretty good Calan. For me to hold 25psi I need to spike to about 32psi. It falls to 25 by redline. I have the boost source disconnected from the wastegat and it holds really good down low. I usually see 30psi at 5500rpms but after that it drops 5psi pretty quickly. I cant wait to get rid of this turbo. But I have now planned to buy another shell to swap my parts too due to a wreck I had awhile back.