to me it looks like it spools faster on v power than meth.

I hope you find it, I put a billeted T on my 2.5 and it spooled faster but made less power than the non billet H I took off.
Trev

to be fair I don' know ewher t start :-(

Odd :wonder:

Something to check - After doing a trackday I noticed a 'tinny' noise in the exhaust, more noticeable after a cold start and coming from the downpipe section. It turned out that the wastegate had no pre-load and was ratting/ leaking exhaust. After re-setting the pre-load I got overboost which I adjusted via the AVC-R boost solenoid duty. It may be 'placebo effect' but it seems to build boost a bit quicker now although of course, the power figures should not be effected.
Grip the actuator arm and if you feel any movement, chances are it needs re-setting.
Looking at the power curve, there is a very definite dip without a corresponding dip in the boost. I may be talking rot but it's as if the AVCS switched off. The neutral position switch does fail - I replaced mine while the box was off during a clutch change.

JohnD

http://i1092.photobucket.com/albums/...220_192304.jpg
other side of graph. doesn't make sense to me.
a bit of light???

Comparison

http://i801.photobucket.com/albums/y...ps73ccaeea.jpg

I know its a different rr but this is before my turbo being billete.
http://i1092.photobucket.com/albums/...220_193159.jpg

Hi Craig

Spool on the V-Power will be always better than Meth,I know this from our wagon,on our wagon difference has been somewhere in 200-300RPM,on road this difference has been negligible

Meth in general will give you more bhp and torque

In yours case not sure,something is not right and I would expect on meth at leas 460-480bhp on yours

FMIC we run same like you are running,I think you have there some restriction,where hard to say,but NPS can be first and second bit I would check exhaust/headers etc

I would try put induction to the engine bay and use RCM induction kit,has been proven on many cars and I wouldn't use at this power any cold air feed,some cold air feed inductions are too small for 450bhp+

Jura

the billet is spooling slightly later but holding up better top-end. boost is held better through to redline.
My guess is a slightly bigger wheel??
It's difficult to evalute on the road, the difference between very fast and very very fast.
Trev

cheers jura
Nps?

The thing is. I dont want vv fast,
just want spool and more torque

Jura, I found spool is unafected, meth or Vpower only, meth certainly gives better mid- range. On the STI 8/20%meth, FMIC, 450hp is more the norm rather than the higher 400's.
Trev

It's just my amature opinion but thats what a smaller compressor wheel gives you.
It may be the turbo is more suited to the 2.5.
Trev

I had the smaller wheel put on and obviously housing to suit for spool.

Yes turbo with billet wheel spools in my view faster than non billet and holding better boost in higher rpm

Wheel size should be same as non billet,just billet wheel is different design and its like you are said lighter

Jura

Hi Trev

I've check several times datalogs from Syvecs and compared them,those tests we are done like on the road or track or drag strip

Meth yes will give you better mid range and yes in some cases spool is not affected

Jura


Many guys has run MDX321T on 2.0L and all of them has been happy and spool up on newer T range is better in my view than on older T

T is in my view is suited 2.0L,but V I wouldn't use on 2.0L or 2.1L without the AVCS,on 2.0L is V too big and will never spool as on 2.35 or 2.5L

Juar

cheers jura.
I just dont know where to start looking.

Hi Craig

I don't know too where,but guys above like me pointed out where we would look first

Are you spoke with Simon if AVCS has work,when car has been mapped or do he thinks if NPS can be faulty

Or do he think,there is some kind of restriction on exhaust/headers or induction side

I still think there is some kind of restriction

Lastly I would go on different dyno and try one power run,maybe Area 52 dyno is low reading dyno and on different dyno you can have different/better result,wish you are leaving near Surrey Rolling Road,which we are using only and Charlie is real legend

Jura

the next closest one is scooby clinic jura . so can try them out. I dont like to keep pestering simon about my car as I know hes a busy man
Thanks again

Speak to Simon Craig drop him a email and I'm sure he back to you as soon as he can.
He will know if it's right or not mate

Scoobyclinc can be good option for you and I would at least drop Simon email,I' sure he will let you know what he thinks on this



Jura

+1

Jura

Craig, I'd go back to RCM as their RR is known to be one of the most accurate, & that's where I'm going next time. Iv found using different RRs only confuses matters, always use the same place. Iv got a Smoke Pro which can check for leaks in your exhaust & inlet, if you drop by some time I can do the test, won't cost you anything & I think it's a good starting point to rule out the basics. Definitely speak to Simon too as he may know what's wrong.

thanks rich that will be brilliant. .
im free all over xmas hol
just let me know the best for you

I'm about on Monday, not too busy in the afternoon if that's any good to you. After that I'm fairly busy over Christmas with family, may have a spare half day just before Newyear, or if you aren't in a hurry I'll have plenty of time after the Christmas break.

im at work mon mate. like I say if you can do just before newyear would be great. if not after the new year when it suits u :-)

PM me after Boxing Day & I'll confirm when I'm free.

Looks very similar to my graph, I'm running an md555 and am having the same problem. It made good power but it's very laggy. Also it's quite low on torque. I've got the same spec as you without the headers and made 414/335 on v power. Not sure if the headers have alot to do with the low torque figure.

cheers mate

MD555 or MDX? I've an MDX sitting here, unsure about putting it on though :(

Perhaps a compression test or a leakdown test would be a good idea to make sure the engine is healthy. The tests are fairly cheap imo.