Restriction In The Exhaust

[jet_r31]

Yes I do ALL of the work on my car . Amongst other things I wired up the ls coils, put the rb30 bottom end in, do all tuning and recently put some type b cams in. Not that that is particularly relevant.

You are guessing as to how much the power band will shift. Typically better cams will have more lift which will create more flow all over and therfore increase power in all parts of the Rev range, making the shift to the right not as bad as you would imagine.

Have you put in cams? Not that I care.

This is correct, a more aggressive ramp rate on the lobe will do this, depends on motor to motor though, some you can have your cake and eat it to

cheers

'darren

[rondofj]

Do most of you run ebcs over manual boost controllers? Holding 2 extra psi could be the difference between an exciting car and an 'almost exciting one

[Badgaz]

i don't think 2 extra psi is going to be that much of a difference.

[CEF33Y]

Well, From my understanding, the main advantage of a good ebc is the ability to "tune" the ebc to make the boost do what you want, i.e hold flat to redline, and how it ramps onto boost.

If your looking to get everything you can out of your setup I'd think it would be an advantage.

But back to your original post, are you unhappy with how the car goes? or do you just want it to make a number? cause the power figures your talking about, I dont see much variance in them, and they're also over two different tuners and two different dyno's.

Plus your saying the car feels better now, so whats the issue?

[XKLABA]

More boost will make a restricted system worse, if the rear housing or manifold is restricting the system more boost will dramatically increase manifold/back pressure coursing detonation

Get an EBC, they are better all round and will hold the wastegate shut longer by not allowing it to creep open which will make it ramp onto boost quicker and you can try different boost levels to better see what's going on

We tried 22psi on my 32 but didn't gain any more power but had to remove timing, 19psi is the sweet spot for my setup, you need to find yours

Same thing with my 34, we couldn't run more then 28psi for the same reason, the twin .64 on a 3ltr don't like that much flow

[rondofj]

I'm already at the limit of my boost level of 22psi on 98 fuel so not looking for more boost. But that boost is dropping down to a max of 4psi after 4500rpms onwards, so am looking to hold it up as far as possible and bring it on harder/make a few more kws and quicker car.

[Super Drager]

I never really understood the point of installing a turbo that is suppose to be efficient at higher pressure ratios, then jamming into restrictive housings and stock exhaust manifolds. On 98ron its the perfect combination for a mediocre result....

Sounds like the setup is much better suited to a hypergear turbo.

Just my 2c

[AngryRB]

rondofj- at the risk of stating the obvious, are you still using a 0.63? maybe I missed something but if so then isn't that the limit of the housing? I must of missed something lol.. flame on!! haha

[rondofj]

Yeh mate, 0.63 like Kurtis did on his neo- 372kw from that on e85 and high mount mani. If you take 15% off that to get a rough estimate on 98 you get 316kw which is roundabouts what I should be making yeah? 316kw and 280kw is a big difference, even if mine is low mount

[Ben C34]

Where are you pulling 15% as a rule from?

[zebra]

316rwkw from a 5558 on 98 with a 100 dollar exhaust standard manifolds etc

nah

nup

Nope

[hy_rpm]

Yep you can't just say should be around 316kw

There are a lot of variable between yours and his setup

Yours is on the std manifold his has a high mount tubular manifold

Was his tuned on the same dyno as you I don't think so

His can handle more boost than your cause the e85

[hy_rpm]

Engine cond can't be the same

Intake will less restrictive on his as it's highmount less bend and so on

There's your 20-30kw differences there

Either way your are very close to the limits of the .63 rear housing and your engine will be a lot happier with a .82 rear especially on pump 98

Yes it will be alil Doughier maybe 2-300rpm laggier but it's worth the piece of mind especially on pump 98 and at those boost and power levels

You can't have the best of both worlds or deal with it being restricted and less power but more responsive

[rondofj]

Whether its a $100 exhaust or a $2000 branded shiny one, flow is all that matters and mines sorted flow wise so that makes no sense. Stock mani 'could be a possible restriction. 0.63 housing- Im not sure how different this is to the garrett version. And 15% less kw on 98 than e85 'generally goin by info on many forums.. In either case i should theoretically be at least over 300..

[Manuel Kasko]

Stop being a dyno queen dude and just be happy. You came here because of a restriction, you got that sorted and you said the car was driving better than ever. So why is this still going chasing the 300 that you believe you have been robbed?

People have already told you the variables and the biggest one is the dyno. It gets said time and time again that you can't compare results on different dynos. So either go chuck your car on their dyno or just be happy that your car is in the range of what's expected

[AngryRB]

whats the difference between a garrett 0.63 and a precision 0.63? if there isn't much then 280 is going well, if the restriction in exhaust is solved then surely the housing is the next thing to change.

[hy_rpm]

Well said manuael

[Badgaz]

yeah dyno's don't mean crap...the race track is where results are proven.

[XKLABA]

In your first post you state you lost power going from 20 to 23 psi and you made 270kw at 20psi with very retarded timing, so if you lost power going from 20 to 23psi then I wonder if you lost power going from 18 to 20psi and having to retard the timing at 20psi

Get it back to 18psi and see if that allows them to run more timing and see if it gains you any more power

E85 benifits knock limited engine a lot more then ones that aren't, there certainly isn't a rule of thumb on gains from converting to E85, some motors might pick 5% where other may gain 40% really depends on how the motor is setup and if its limited by knock, I'd say your motor will pick up a heap from going E85 cause it sounds like it is very knock restricted

[AngryRB]

I found a VW forum where a guy has a few similarities to your setup, he mentions that the seimens fuel injectors are a bit unreliable, he is using 35psi and only getting 420ish hp and high reading dyno,

maybe your turbo is just at its limits and the fuel injectors are shithouse, if they partially sieze up or the spray was rubbish, that might be restricting the tune. This guys AFR is up and down.

http://forums.vwvortex.com/showthread.php?6149918-5558-Dyno-Results-and-what-I-ve-learned&p=83227622#post83227622

I vote for 0.82 rear and some 1000cc ID's

Edited May 15, 2014 by AngryRB