thoughts on my dyno and turbo size

[Robocop]

interesting. 460hp divided by 0.85 is 540bhp.... more evidence..

Turbine housing is 16cm which is estimated by turbolabs to be about 1.13 a/r

Could i just get a 62mm wheel from turbolabs and call it good?
you look like you know a thing or two about turbos.

https://www.ebay.com/itm/Holset-Turb...ty!92804!US!-1


here's a 67mil.

https://www.ebay.com/itm/Holset-Turb...sid=m570.l1313


Honestly i love the lag/off power because it saves my parts from breaking. i have 205 tires in back btw.
it's an m30 so it has a buttload of tq when i need it just driving around.

i really appreciate the help here you guys are going to see this thing pull to 7k hopefully..

[someguy2800]

I do think the turbo is pretty close to its limit but it does not explain why it trips and falls on it face so abruptly. Something is amiss and I still think its the valve springs and cam combination. That 62mm billet wheel would be a great addition. The 67 is a bit big for the turbine unless your going for like 700 whp.

[Def]

I do think the turbo is pretty close to its limit but it does not explain why it trips and falls on it face so abruptly. Something is amiss and I still think its the valve springs and cam combination. That 62mm billet wheel would be a great addition. The 67 is a bit big for the turbine unless your going for like 700 whp.

High turbine inlet pressure due to pushing the turbo hard + poor flowing 2V head = poor high RPM volumetric efficiency


Even modern engines that push their turbo hard get a similar torque curve because the high RPM VE is in the dumps with really high TIP. Here's a 3.5L Ford Ecoboost pushing some "stock upgraded" turbos pretty hard. It's like a torque pyramid:

[someguy2800]

Yes that’s what a power curve is supposed to look like. Now look at the hp line in the first post at 5800 rpms and tell me that’s due to VE. It looks like something kicked it square in the twat.

[Def]

Yes that’s what a power curve is supposed to look like. Now look at the hp line in the first post at 5800 rpms and tell me that’s due to VE. It looks like something kicked it square in the twat.

Could be something wrong, or it could just be starting to choke the turbine flow and having turbine inlet pressure ramp up quickly while engine VE is naturally falling towards redline. An M30 is going to have its VE really fall off towards redline, and if you put a turbo out of breath on top of that it's going to drop power like a rock.

I will say I find the timing numbers a little odd. There's a ton of timing retard going to about 200 kpa, then it's essentially flat above that. I've never seen such a steep amount of timing taken out to just 14 psi, then taking out almost nothing above that. Usually it's something like 0.8 deg/psi, then going to more like 0.6 deg/psi, 0.5 deg/psi etc. as boost rises.

[Robocop]

idk Def,
the answer on that weird map is that i just tuned for WOT under max boost using my butt dyno.
and anything under 6psi / 140kpa i left about stock.
Between like 9psi /160kpa and full boost i figured those cells are only going to be hit at WOT
so didn't think at the time it should matter because tuning method i'll explain below.

The way it went with the stock cam.
I street tuned starting at 18*,
then going for a freeway blast every time going up +2*.

Every +2* TQ picked up tons. it was unreal the pickup of just 2*.
After 22* it didn't feel any faster so i left it there.

This is obviously not right but it got me in the ballpark and maybe lower boost likes more timing
i have no idea how it works so 22* was set for "i'm flooring it now give me all the boost" mode.

Perhaps the cam would like more timing, or not. i'm a noob at tuning i just get shit running thats it.

Suggest away i've seen you here for years you're a genius.
give me numbers i will punch them in.







http://www.iemotorsport.com/bmw/item/m30vsdual.html
ordered those should be here this week putting them in asap and dyno.
see how it goes.





.

[PowerKraut]

I Dont think that moneyz well spent. Would Have save it for hot cam or bigger inducer or both.

- - - Updated - - -

Srsly, when removing springs, just throw hot cam in for massive gainz.

[someguy2800]

I Dont think that moneyz well spent. Would Have save it for hot cam or bigger inducer or both.

- - - Updated - - -

Srsly, when removing springs, just throw hot cam in for massive gainz.

He already has this cam in it. Its my theory that its floating the valves due to the big cam and stock valve springs.

http://www.catcams.com/products/cams...MSETUP_id=1428

[PowerKraut]

Okay, i missed that. Than thats really drastically dropping Power. Even for a stock cam that Power drop is Not really normal. I am really excited what those springs will do.

[Robocop]

been dailying it for some time and had a chance to open her up.
check it out.

originally the VE table was set for a target of 11.8 at WOT, i have changed it to 12.0 but just remember the VE
was tuned for 11.8 give or take.

check out what happens at 5.8k where my dyno falls on it's face. in the second picture.
you can see my EGO correct adding 0.7 of fuel, and still it's lean.
i believe valves springs did indeed help? perhaps? maybe? Dyno on mon-tue hopefully.
i don't remember the boost control settings so i just tried to keep PW flat throughout.
boost ramp up is 14psi-17psi

afterSprings1 by jet jones, on Flickr









afterSprings2 by jet jones, on Flickr

[Robocop]

Some other misc stuff.

Springs/retainers.
M30 ie valve springs by jet jones, on Flickr


i used bolts which misaligned the gasket by backing out.
obvious leaks. Fixed with studs and copper nuts.
Don't use bolts by jet jones, on Flickr
Bad gasket alignment by jet jones, on Flickr
Bad gasket alignment 2 by jet jones, on Flickr


Chinafold had some warp to it so had it resurfaced.
Crack, but the thing is thick enough it did not show on the inside so left that alone.
So flat by jet jones, on Flickr
Crack? by jet jones, on Flickr


Very happy i got this.
Pew pew 1 by jet jones, on Flickr
Pew pew 2 by jet jones, on Flickr



Old plugs
Old plugs 2 by jet jones, on Flickr
Old plugs 3 by jet jones, on Flickr
Old plugs 1 by jet jones, on Flickr



Re-did the blue spark wire ground
it was bolted down from under the coil to the cover
now it's bolted down from the top and a 10g wire to the cover from the block.
Ign1a by jet jones, on Flickr

[Robocop]

hey bimmer bois boosted clan. what up.

someguy2800

you nailed it. Got'em.

it was the valve springs.

it made less power but it actually reved out like a normal engine should, i think.
i even got the VE dyno tuned, just set autotune and let the guy basically go up the columns on the table and holy shit did it tune every fkn cell....
it was something else the manifold was glowing and it got all the n/a portions and stuff it would have been impossible to get.

it made 500tq at like 3,500. Very exciting. am i in the club??









Turns out it likes 23* and 24* after 6,000
This time it was done in 4th how did the clutch make it idk.

dynopsi2 by jet jones, on Flickr


dynohp2 by jet jones, on Flickr



good dyno pull 2 by jet jones, on Flickr

[NOTORIOUS VR]

Nice to see you're making head way!

I would start working on your PID control for the boost controller next... that WGDC looks crazy (reflected in your dyno pulls as well).

[Robocop]

You're right, i'm going to have to.
The PID was tuned like 6 years when i had the m20.

[someguy2800]

[Def]

Glad you found the issue, thing holds power up top better than I thought it would!

[Robocop]

more issues sorta.

i fked up the threads on one of the axles, so i can replace the bearings.
not allot of e30s at the yards anymore.

...So i thought i'd get NEW duralasts from autozone 70bux each.

First 2nd gear pull maybe 1 mile out.
Sounded like my diff blew up but snapped an axle.

Think it was just shitty china axles?
or because i put on some wider tires, 225s instead of the 205s?
See, that's why i like to tune out most the torque from this m30. :P

idk what to do.
maybe just get oem junkyards axles and have them rebuilt
see if they don't blow off.

https://youtu.be/jvQI4HC_izU <----vid





5lug? by jet jones, on Flickr

[Def]

Cheap china axles. They usually hold like half the torque of a stocker or less from what I've seen.