How is your boost response?

I finally got my Superzilla on and with stock headers and an external, I am hitting 13 psi @ 3k. Pretty good response if you ask me.

I am curious what boost others are making @ that rpm.

Other things to consider, this is an EJ207 RA C... the stock header, uppipe and dowpipe are all wrapped, this was a 5th gear pull starting @ 2300. I am using an SBC iD boost controller.... oh and an MRT frontmount.

Also, in 4th I hit 10-11 psi by 3k, which I again, I think is pretty good for such a "large" turbo.

Just for reference, my old VF36 twinscroll set-up was hitting 15 psi @ 3k in 4th and 20 psi @ 3k in 5th.

Any feedback would be greatly appreciated.

def

BTW- I kinda felt this fit under 2.0 technical AND proven power.. but figured I'd start here first... if some mod feels the need to move... go for it! ;)

EJ205, TXS Stg4, FP20G (TD06, 7cm) ported, JDM 6MT. 12 psi @3000, 24 @ 3800. :) Hope my GT35R works that well.

Ah. I forgot something of import: add an unwrapped / coated Cusco header to that ;)

Oh, and I have an unmolested 8cm housing for the SuperZilla and my numbers come from a stock WRX gearbox.

def

how is that stock gearbox holding up with the 20G?

probably no better than the rest of his other ones!

how is that stock gearbox holding up with the 20G?

The SuperZilla is pretty much the same thing as a Green... mine moreso than others because it started life as a FP20G.

Anyway, I am COMPLETELY untuned. I am running a rough tune I had from when I switched to OLF and when I was running the twinscroll. I then adpated that to a 13G @ 14 psi when I sold the twinscroll... which is now running the SuperZilla.

My a/f's are super rich and I've only bumped the boost controller up to see what I hit @ 3k, which I was pretty sure wouldn't be too much. Otherwise I have been running off the wastegate spring, ie- 10 psi or so.

Long story short, I plan to have the TXS dogbox in before I tune or make any kind of power.

def

Hmmmm, ya got me thinking now? I know I am getting boost fairly early with a 7cm Green but I have a QuickTime Header so it seems to have a lot of snot when it's not on boost

Don't remember exactly cause I have been to lazy to pull any logs but, in 3rd I am getting in the 13 to 14 range I think? As soon as I hit 4k it goes nuts and wings up to 30 psi according to my EVC5. I think it's about 4 psi over though.

I switched to a USDM 6MT cause I hurt my JDM and it sux. 5th and 6th bog my engine to much and the Hyper Semi Carbon twin disc slips like theres no tomorrow.

Even after a Junior tune to 405whp I only got a 12.6@116 :mad: Rotten clutch :furious:

04 STi - TEC TD06H-20G (15 psi internal wastegate), APS 3" catless exhaust, AVC-R. If I turn up the EBC all the way I can see about 15psi by 3200-3300rpm and then 1.75bar by 3850 in 4th gear on a roll. This is at 5000ft asl on the untuned stock ECU.

Absolutely no complaints about driveability in the least. Thinking about upgrading the compressor wheel to get same boost at lower turbine rpms for efficiency sake though.

I think I will be deep into the twenties by 4k once tuned. Maybe 20 psi by 3500-3600 and 25-28 psi by say 3600-3800?

That would be nice ;) We'll see soon enough...

def

04 STi - TEC TD06H-20G (15 psi internal wastegate), APS 3" catless exhaust, AVC-R. If I turn up the EBC all the way I can see about 15psi by 3200-3300rpm and then 1.75bar by 3850 in 4th gear on a roll. This is at 5000ft asl on the untuned stock ECU.

Absolutely no complaints about driveability in the least. Thinking about upgrading the compressor wheel to get same boost at lower turbine rpms for efficiency sake though.

So, I am seeing almost the same boost as you, but I have a slightly bigger turbo and a smaller motor? Wow, that altitude sucks! I knew altitude affected power in terms of absolute pressure... but I would not have thought spool up would have suffered quite as much.

def

Do you have AVCS working?

Do you have AVCS working?

yes.

def

10 psi by 3000 rpm's sounds unstreetable :lol:

10 psi by 3000 rpm's sounds unstreetable :lol:


10 PSI out of that turbo is a lot more air than a stock turbo @17PSI.

my 20g makes 18.8 psi by 3000 rpm

With TXS uppipe, DEI heatshielding from exhaust ports to downpipe (and all leaks fixed :-)) I made 21psi @~3750 /w a FP20G 7CM^2.

Shield react like a DSM with the ACVS.

my 20g makes 18.8 psi by 3000 rpm

really? this on a 2.0 liter?

def

So, I am seeing almost the same boost as you, but I have a slightly bigger turbo and a smaller motor? Wow, that altitude sucks! I knew altitude affected power in terms of absolute pressure... but I would not have thought spool up would have suffered quite as much.

def

Yup to put some numbers to it you can also picture the rpm cross lines on a compressor map. To run that 1.75bar at 5000ft I was running PR of:

PR = (25.35 + 12.0) / 12.0 = 3.14.

This is neglecting the vacuum in the intake which conservatively kicks up the PR by another 0.1 so 3.2 PR. Going off the top of my head that puts the turbine around the 130,000 rpm range.

With my 2.0L WRX and a plain VF22 I would see between 600-700rpm lag difference in a 3rd gear roll to full boost between sea level and 6000ft asl in Colorado Springs.

really? this on a 2.0 liter?

def
on my sti, 2.5 liter

my 20g makes 18.8 psi by 3000 rpm

:huh:

Good lawd ?!?!?!

I was wandering what the biggest difference between the DB 20g and super zilla was........but Christ.....I don't care if that thing will hit like that so early. Makes my choice for the deadbolt 20G a no brainer.

Please post the rest of your setup.

:huh:

Good lawd ?!?!?!

I was wandering what the biggest difference between the DB 20g and super zilla was........but Christ.....I don't care if that thing will hit like that so early. Makes my choice for the deadbolt 20G a no brainer.

Please post the rest of your setup.

ecutek
injen fmic
esx dp w/cat
stock up
injen catback
injen cai
stock bpv
740 cc
walbro pump
turbosmart boost controller

happy with results, considering all the stock parts lol

btw in 5th and 6th gear it hits full boost at 2500- 2700 rpm

Oh, and I have an unmolested 8cm housing for the SuperZilla and my numbers come from a stock WRX gearbox.

def

Doug, what happened to your RA geared tranny?

10 PSI out of that turbo is a lot more air than a stock turbo @17PSI.

Not at 3000rpm it isn't.

as much boost as i want to run at 5k in 1st gear, 4400 in top gear.

just thought id post some numbers off of another turbo. garrett t62-1 on a 2.4 liter stock header stock cams

very interestin results people.

any1 want 2 chime in with an avo or garrett turbo, as lookin at 1 of these variants 4 my ej207. (as well as green superzilla)

btw my vf35 starts making boost at 2500 20psi by 3600 rpm in 4th

I have an xs450/avo400 that I'm gonna throw into the mix here as soon as I can get a leak in my system sorted out.

as much boost as i want to run at 5k in 1st gear, 4400 in top gear.

just thought id post some numbers off of another turbo. garrett t62-1 on a 2.4 liter stock header stock cams

garrett

on my sti, 2.5 liter

ohhhh... that makes sense... the screen name confused me. :D

def

Doug, what happened to your RA geared tranny?

I sold it. Gonna go with a Turbo XS dogbox. Mikaust has one, and after driving a good bit, I have become VERY found of it ;)

Sooo.... in the mean-time, I run a stock WRX box with a completely untuned set-up... capable of turning the box into scrap metal. sigh.

It still fun to drive though... haven't revved it over 5k, no more than 13.0 psi and like I said before... rich as hell.

def

10 PSI out of that turbo is a lot more air than a stock turbo @17PSI.


Pavlo beat me to it, but he's right. Someday, everyone will realize this, but boost in psi is just a measure of backpressure compared to compressor flow. At 3000 rpm, even the stock turbine housing is not restrictive, and, given an otherwise-equal engine and intake/exhaust track, high boost numbers will indicate more airflow. 17psi is not grossly overreaching the stock turbo's efficiency, and 10psi is way, way below the efficiency "sweet-spot" of the SuperZilla compressor (a 50-trim, by default).

At 7000rpm, where the stock turbine and housing are SIGNIFICANT restrictions.

-Sean

Ok guys... more testing. I have slowly worked the boost up to 20 psi.

Now I am abit worried. The turbo seems to be spooling too quick, if there is such a thing.

I am getting 19-21 psi by 3100-3200 rpms in 5th starting @ say @ 2500 or so.

Sounds great and all... but I am worried that the turbo isn't as big as I want it to be.

Heres the concern, mikaust and I have almost identical set-ups. He's got a Green, I have the SuperZilla. Both with 8cm housings. Both 49lb compressors. His is clipped 10.

Anyway, he's not seeing 20-23 psi until 4100-4300 rpms in 4th. My 4th gear pulls give me about 17-18 psi by 3100-3200 rpms.

Whats the deal? Does he have exhaust leaks? Is my turbo smaller than I think?

The only differences other than turbos are:

1- AVCS, I know mine is operational. His we are not sure about. I know AVCS is worth some spool... but what I am seeing seems too good to be true.

2- Headers, I am running a mildly modded stock header wrapped real well, he's running GTSpec headers wrapped decently.

3- While we are both running 38mm tials, I am running the firering AND a gasket mating the wastegate to the uppipe, while he was told to only use the firering.

I guess I just need to get her on a dyno for some tuning and see what she makes...

until then the paranoia needs to stop.... lol!

def

ecutek
injen fmic
esx dp w/cat
stock up
injen catback
injen cai
stock bpv
740 cc
walbro pump
turbosmart boost controller

happy with results, considering all the stock parts lol

just wondering if this is your daily ride? with your set-up and all is it street friendly?

just wondering if this is your daily ride? with your set-up and all is it street friendly?

yup i drive it everyday, very street friendly.

Now I am abit worried. The turbo seems to be spooling too quick, if there is such a thing.

I am getting 19-21 psi by 3100-3200 rpms in 5th starting @ say @ 2500 or so.

Sounds great and all... but I am worried that the turbo isn't as big as I want it to be.

That's tough, man. Poor guy drives a rocket every day. :D

I think the question is why is your buddy's not spooling up as quick as yours.

Do you both have the same gear ratios?

someone once told me not to use a gasket on the tial 38mm, and so i didnt, then about a week later, i pulled the gate, and the whole thing leaked. so id say use gaskets on the WG, that might be alot of it. also compressor side has nothing to do with spool up. you can have a huge turbo like the t3-67 from full race, and make full boost at like 3500RPMs with a 75 lb compressor. that has been done on sr20s and full boost at like 4k in hondas. Spool up has everything to do with the turbine wheel and housing. and weather or not the turbo is BB or GT or T or what.

I think it's the clipping, less surface area to turn the turbine.

could be that too. clipping is really inneficient

clipping sucks IMHO, last resort kinda thing.

I worked the area around the wg hose to prevent creep on my SZ55 and it worked a treat. I had to slow spoolup to avoid surge (3" straigh inlet on turbo didn't help surge), but I could have as much boost as I wanted at 2900rpm in 5th, 1 bar by 2800 in 4th, 1.3 (controlled) by 3000, and 1.8 bar at 4500, this more gradual input of boost made the 2.5 nicer to drive I think.

Paul

Paul

thats cool, my 2.4 liter has 3psi rpms at 3k, 5 psi, at 4k, and 22psi (or more) at 5k in first gear could go to 30 if i wanted.

I am getting 19-21 psi by 3100-3200 rpms in 5th starting @ say @ 2500 or so.

I guess I just need to get her on a dyno for some tuning and see what she makes...

until then the paranoia needs to stop.... lol!

def


Sounds like a terrible problem to have :lol:

Ok guys... more testing. I have slowly worked the boost up to 20 psi.

Now I am abit worried. The turbo seems to be spooling too quick, if there is such a thing.

I am getting 19-21 psi by 3100-3200 rpms in 5th starting @ say @ 2500 or so.

Sounds great and all... but I am worried that the turbo isn't as big as I want it to be.

Heres the concern, mikaust and I have almost identical set-ups. He's got a Green, I have the SuperZilla. Both with 8cm housings. Both 49lb compressors. His is clipped 10.

Anyway, he's not seeing 20-23 psi until 4100-4300 rpms in 4th. My 4th gear pulls give me about 17-18 psi by 3100-3200 rpms.

Whats the deal? Does he have exhaust leaks? Is my turbo smaller than I think?

The only differences other than turbos are:

1- AVCS, I know mine is operational. His we are not sure about. I know AVCS is worth some spool... but what I am seeing seems too good to be true.

2- Headers, I am running a mildly modded stock header wrapped real well, he's running GTSpec headers wrapped decently.

3- While we are both running 38mm tials, I am running the firering AND a gasket mating the wastegate to the uppipe, while he was told to only use the firering.

I guess I just need to get her on a dyno for some tuning and see what she makes...

until then the paranoia needs to stop.... lol!

def

aren't u experiencing boost surge ?

EJ20K

[QUOTE=Pavlo]clipping sucks IMHO, last resort kinda thing.
why does clipping suck?

aren't u experiencing boost surge ?

EJ20K

I am getting abit around 4k, worse in the lower gears, not so bad in the upper gears.

I finally hooked up the front O2 sensor last night... 1st in over a year. I think it does help the car run abit smoother. lol! Really though, not much difference, but figured I'd go with it.

def

what bov are you running?

when i installed my dr500 fmic, i was getting surge. with the stock bpv, i was getting surge, and with my worx tuning bov at all settings i was getting varying degrees of surge.

picked up the aps bov and no surge. maybe a consideration?

[QUOTE=Pavlo]clipping sucks IMHO, last resort kinda thing.
why does clipping suck?

it reduced the turbine efficiency BUT increase topend flow. Its a bandaid for a less than ideal exhaust side for the power levels one wants.

def

what bov are you running?

when i installed my dr500 fmic, i was getting surge. with the stock bpv, i was getting surge, and with my worx tuning bov at all settings i was getting varying degrees of surge.

picked up the aps bov and no surge. maybe a consideration?

I am currently running an RFL. I am pretty sure the surging I am experiencing is 100% tuning related (could actually be that I am running so rich I am fowling out). People have run bigger turbos than I got with the same BOV with no issues. Thanks for the insight though.

def

BTW- what turbo were you running?

For those running a 20G, did you have the WG ported at all?

*cough* garrett *cough*

I am currently running an RFL. I am pretty sure the surging I am experiencing is 100% tuning related (could actually be that I am running so rich I am fowling out). People have run bigger turbos than I got with the same BOV with no issues. Thanks for the insight though.

def

BTW- what turbo were you running?
sr50

Well I have to actually take some boost out of my car. I hit 30psi according to my EVC5 and I am getting a bit of det every now and then. OK a lot of det :mad:

Been able to pull this boost with the stock BOV too :rolleyes:

Well I have to actually take some boost out of my car. I hit 30psi according to my EVC5 and I am getting a bit of det every now and then. OK a lot of det :mad:

Been able to pull this boost with the stock BOV too :rolleyes:

Noone ever said you couldn't hit 30 psi with a stock BOV... but the question is, how much harder is your turbo working to make that boost... cause the stocker is known to start leaking around 20 psi+...

I just hope I make the power I want... :D

If not... I'll be selling this turbo, or upgrading it. :D :D :banana:

def

Noone ever said you couldn't hit 30 psi with a stock BOV... but the question is, how much harder is your turbo working to make that boost... cause the stocker is known to start leaking around 20 psi+...


My thoughts exaclty :lol: I still need some more tuning to get it to run a bit smoother and get a clutch that will hold :rolleyes:

For those running a 20G, did you have the WG ported at all?
nope

nope

do you get any creep?

Erik

do you get any creep?

Erik
no not at all. it hits 18.8 psi and just stays there.

i would tell you but my boost gauge sucks.

It reads vacuum when the car is off.

and yes, it is the OEM gauge pod, its disappearing soon.

However, my superzilla rocks. It sounds awesome on spool up, kind of a normal turbo sound and then a demonic scream...hehe

And im running an external wastegate.

just a quick note.

Surge being talked about here is compressor surge, ie running outside the surge line of the compressor. This is an effect at full throttle, but gives similar noises to the surge found on backing off. As such the WOT surge will not be fixed by a BOV.

As for clipping, I think it's a terrible thing to do. If you need more flow, get a bigger wheel or housing, now I realised that's not always possible, but a few people are prooving you don't need to clip the TD06h wheel to get good results. Maybe a very slight clip would lift a little more power, but at the expense of what?

Paul

Stupid question maybe, but what is 'clipping'? Does anyone has a picture of it?

Arjan.