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Old 04-25-2008, 08:36 PM   #126
tino
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Quote:
Originally Posted by Homemade WRX View Post
so, you are still choking the engine? doesn't look as bad...
my guess would still be that intake manifold as its the only off the wall item in the build. The head's weren't heavily ported, were they?
I dont know now micah.. I think that the cams were the issue and the cam bolts snapping have suggested that the cams werent in perfect alignement..

By getting another 21 hp atw on the same boost suggests that this is the case. The torque also dosent seem to drop off as much.

You also have to remember that peak numbers dont mean much compared to you guys in the U.S as we do make much lower numbers in AUS. but the increase in hp to boost sounds about right to me now...

The heads werent heavily ported.


I think exhaust is the next thing to look at, but going to a 1.15 housing will cause more lag and i dont think i want to go that way at this stage..
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Old 04-25-2008, 08:36 PM   #127
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Quote:
Originally Posted by Full-Race Geoff View Post
what i was saying was most people connect their downpipe to their exhaust with a 3" 2bolt flange. Unbolt the exhaust at this flange, and run only the downpipe, no muffler, cat, etc. This is to make sure that a muffler or flex section has not broken off or collapsed, causing a restriction and excessive backpressure (i have seen this happen before). By only running the downpipe, this verifies that the backpressure is before the turbine wheel, meaning turbine housing, up pipe, header or exh cam. Now you should run a pressure transducer on the exh side or a differential pressure gauge to compare exh mani pressure to intake mani pressure
Thanks geoff,

Ill reply to your pm...
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Old 04-26-2008, 08:36 AM   #128
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I'd love to see you throw the stock intake manifold on and then retest.........
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Old 04-27-2008, 01:20 AM   #129
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so why did your cam bolts snap?
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Old 04-27-2008, 03:38 AM   #130
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^^^^

Why did the cam bolts break, well apparently they were tired from being put in and out of two engine builds..

Why werent they replaced with new ones on this current high HP build if this was the case still fathoms me...


Quote:
Originally Posted by modaddict View Post
I'd love to see you throw the stock intake manifold on and then retest.........
I wish that it was that simple some mods and tuning need to go with switching the manifolds and considering im out of pocket now for the engine being pulled out again im not going to venture playing around for a bit..
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Old 05-06-2008, 01:41 AM   #131
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Update:

Well i was getting a race fuel tune done before i went down the 1/4 mile, as race fuel imo is much better when putting stress on an engine.

With no modifications to boost made 575 hp atw @ 1.9 bar, so it seems the engine is flowing fairly well. The car wasnt being pushed to hard at all and we were just about to put in a lil more boost when we dropped a cylinder again on the re-run at 7700 rpm.

Having a closer look, it seems we have another valve or cam related issue... There was no noise or smoke exiting the exhaust so nothing is broken, which is good. Just means more time at the workshop.

heres the graph:

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Old 05-06-2008, 03:33 PM   #132
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Tino,

Are you still using the Perrin Headers?
Good power to high RPMs. Not many Subarus can come close to that. I think that I have seen 1 or 2.

Good luck
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Old 05-06-2008, 05:28 PM   #133
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hmmm... I guess those Perrin headers aren't as bad as everyone thinks..
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Old 05-06-2008, 08:06 PM   #134
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Quote:
Originally Posted by cpturbo View Post
Tino,

Are you still using the Perrin Headers?
Good power to high RPMs. Not many Subarus can come close to that. I think that I have seen 1 or 2.

Good luck
Rooney, yeah im still using the same exact setup. IMO the race fuel tune would have showed up a restriction if there really was a large one?? This was also all on the same boost.

Going from the numbers there dosent really seem to be one imo??

If we didnt have this recurring valve issue then a couple of psi ~30 psi would have easily netted 600 whp.. Oh well just have to wait til its sorted out again..
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Old 05-06-2008, 09:11 PM   #135
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Quote:
Originally Posted by jigga View Post
hmmm... I guess those Perrin headers aren't as bad as everyone thinks..
Quote:
Originally Posted by tino View Post
Rooney, yeah im still using the same exact setup. IMO the race fuel tune would have showed up a restriction if there really was a large one?? This was also all on the same boost.

Going from the numbers there dosent really seem to be one imo??

If we didnt have this recurring valve issue then a couple of psi ~30 psi would have easily netted 600 whp.. Oh well just have to wait til its sorted out again..
Quote:
Originally Posted by Junior2JZ View Post
I made around 420ftlbs, which is pretty much exactly what you made. I think its that intake manifold. I would just throw a stock manifold on and watch the power come back. Also would help spool.
I dont think the headers will help much. . . IMO I have made almost 700whp with this same exact setup and found no issues with the Perrin EL header. Sinlgle scroll to boot.. I think I am pretty much maxed out in terms of power with this turbo.
Yea... Im going to say it again.. Those headers are ok..
Tino I bet your car will make good power with another few psi.. Take it to the track!!!
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Old 05-13-2008, 07:50 AM   #136
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Quote:
Originally Posted by Junior2JZ View Post
Yea... Im going to say it again.. Those headers are ok..
Tino I bet your car will make good power with another few psi.. Take it to the track!!!
Junior you guessed right
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Old 05-13-2008, 09:25 AM   #137
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^^^That's quite the teaser... Did you take it to the track?
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Old 05-13-2008, 09:31 AM   #138
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Originally Posted by 9vapors View Post
^^^That's quite the teaser... Did you take it to the track?
im sure u posted in my other thread, but here it is for ya if you didnt remember

http://forums.nasioc.com/forums/show...1511354&page=3
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Old 05-13-2008, 09:34 AM   #139
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Ah, I thought you ran it again with more boost...
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Old 05-13-2008, 09:37 AM   #140
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^^^

hahah nah not yet, its winter time in australia, so the track wasnt open tonight. However i need to get a few things organised (i.e smaller brakes, smaller wheels, grippy typres, suspension, launch control, anti-lag, tune) to make the ultimate pass before i get banned from the track..
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Old 07-25-2008, 03:57 AM   #141
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Well my bad luck continues it seems.. Drove the car on saturday parked it for about an hr or so. Jumped back in and turned the ignition which was followed by a massive explosion, smoke was then pouring out of the engine.

Opened the bonnent to see that the back of my manifold had blown off from the welds and the bottom of the manifold had done the same..

Im unsure what has happened and why? Can anyone shed any light on it? Looks as if there was fuel trapped somewhere??

I also not sure if ill switch to a stocky cast manifold, fix this one or go with another design..

Also finding it very hard for someone to make me a new one.. Any offers??

here some pics:




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Old 07-25-2008, 05:56 AM   #142
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Was anything else damaged in the engine?
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Old 07-25-2008, 06:01 AM   #143
tino
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^^^ No everything looks fine.. i think that the mani was very thin so gave way fairly easily...


Now just need a replacement mani...

something like this would work well imo..

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Old 07-25-2008, 07:19 AM   #144
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Maybe if you get ahold of him he will make you one.
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Old 07-25-2008, 09:07 AM   #145
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I have had that before... I think it is caused when your ecu primed your engine before starting. i find that if I go to prime a hot engine, I sometimes hear a little "pop" in the intake manifold, and if the car is in gear, the gear will jerk forward... I think that is what happened to you, but your manifold gave way...I would switch to a stock manifold if I were you. Sure it might not do as well as at the top end, but it is reliable...

That polished manifold you posted was a custom job, and last time I asked him, he wasn't all that interested in selling his work.

Either that, or try the Forsa unit... or the Corsa Veloce unit if it has been released yet.. I thought that was a CNC machined piece, so no worries about welds blowing out.
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Old 07-25-2008, 09:28 AM   #146
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I think xxtuning makes a manifold like the one you posted above. Its a modified N/A one I think.
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Old 07-25-2008, 09:32 AM   #147
tino
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^^^

The bang happened once before a week earlier, but there was no carnage. Maybe it weakend the welds for the final bang.. haha

Yeah ive sent him a msg, hopefully he replies

As for the other manis- im not a fan of the forsa and its plenum design.. The corsa veloce looks good but yet to see how it performs.. or if its worth the 2.5g price tag...
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Old 07-25-2008, 09:33 AM   #148
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Quote:
Originally Posted by silverwrx666 View Post
I think xxtuning makes a manifold like the one you posted above. Its a modified N/A one I think.
The xxtuning one is a 2.5 N/A manifold which cant be reversed asfaik..
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Old 07-25-2008, 11:41 AM   #149
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Damn!

def
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Old 07-25-2008, 01:21 PM   #150
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If you've got coin you could get this one from RCM:
http://www.rogerclarkmotorsport.co.u...800x533%5D.JPG
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