Boost Junky: 2nd Saga - M50-T Project

[Boost Junky 1]

Dang, that is thick!! Sounds like an almost sketchy setup...

Were you not tempted to keep the stock CR & run less boost? A nice option to have up your sleeve anyway!

0.84 is a common size to use on GT3*R's on 2.5l 6cyls

Have seen 1JZ's running 1.06's even (drag cars rev'ing to +8k with big cams though)

Just be V.careful when you do take it for a spin!!

I recall scaring the begeezaz out of myself most times I pull the E30 out of hibernation.

Yea real thick! I kinda acted like a sheep when I selected my hg. Same as what everyone else used over in the states, but it would probably be better on a thinner one but more likely to go bang but I could definitely get away with alot thinner I guess.

Haha yea I definitely will Glenn! I dont even know what to expect yet haha!

[tire 10]

MHmmmmhmhmhm the news is good. Sorry I pissed off mid convo the other nite, my neighbours decided to use their internet.

[topcat 11]

great numbers so far.....

just a thought, did you adjust the cams back to TDC after sliping in such a thick gasket?

a few dergree's out will make quite a big difference with lag and off boost driving.

advance or retarded cams will favour the top or bottem of the rev range.

cheers m

[CamB 48]

You won't get the air/fuel to 14s - it should be ~12 under boost.

These are discussions the tuner should be able to help with and whether you can get it boosting earlier (and why it might not be). Have you checked for boost leaks in the intake (if there are leaks, the turbo has to work harder to get the same boost to the engine)?

Maths says that if torque stays at 400nm until 6500rpm, the power will go up another 20kw. The only way to find out is to try

[Boost Junky 1]

Lol Max! You need to invest in the internet.. surely its much better rates over there than here.

great numbers so far.....

just a thought, did you adjust the cams back to TDC after sliping in such a thick gasket?

a few dergree's out will make quite a big difference with lag and off boost driving.

advance or retarded cams will favour the top or bottem of the rev range.

cheers m

Marty, when I put the motor back together I locked the cams at TDC and crank then followed the user manual as per position of the cam gears which says to turn the cam gears so that the bolts are hard against the left of the slots (M50 have factory sloted cam gears if your didnt know) But yes thats true I wasnt sure how much difference the gasket made but how do I tell?

You won't get the air/fuel to 14s - it should be ~12 under boost.

These are discussions the tuner should be able to help with and whether you can get it boosting earlier (and why it might not be). Have you checked for boost leaks in the intake (if there are leaks, the turbo has to work harder to get the same boost to the engine)?

Maths says that if torque stays at 400nm until 6500rpm, the power will go up another 20kw. The only way to find out is to try

Oh so A/F ratios are not always nicely sitting on 14s cam? Too late now Ross finished tuning my car by Wednesday lunchtime so I found out today. He said it only made another 10kw with an extra 1000rpm and up at 16psi of boost. So I think the motor has some restriction which i believe will be in the air flow somewhere, could be the factory intake manifold being restrictive?

Yup they checked the motor over for boost leaks and shes sweet. Even though my setup has only made an extra 10kw im hoping the torque is much better with the proper tune now. Will the turbo spool better now with higher boost or will that make no difference?

I am yet to collect the car or see any graph printouts as they are tidying up loose ends finishing off looms and getting her to a tidy standard.

Edited August 7, 2009 by Boost Junky

[CamB 48]

Should spool the same, just go higher.

Wait and see how it goes. 270kw at the wheels is freaking heaps.

[Boost Junky 1]

Should spool the same, just go higher.

Wait and see how it goes. 270kw at the wheels is freaking heaps.

Go higher?

Yea for sure im gonna be frightened at that amount of power Cam. I wasnt upset about only making another 10kw its wayyy more than enough for me.

[CamB 48]

16psi is higher than 14psi! It will reach 14psi at the same point.

[Boost Junky 1]

So it will reach 16psi at the same point as it used to reach 14psi so say at full boost which comes in at 4500rpm?

[Mike 1]

no, it will reach 14psi at the same point it reached 14psi. Only boost will keep rising. (assuming all else the same).

I'd be expecting your AFR's around 12.5, 13 tops if your running a decent boost

[Boost Junky 1]

Ah ok got it now thanks Mike.

[QuickSilver 0]

What a finish! Well done matey.

Congratulations.

[Boost Junky 1]

Cheers Alex! Not bad huh too bad it aint a finish haha much more work to be done yet and this will see much more weeks of 2 minute noodles for lunch and mr E30 sitting in the shed lifeless like it has for the last year!

[Guest FrantiC]

Haha, You will get there bro.

You should post up a to do list so we can see what you have left to do

[QuickSilver 0]

Its never really a finish though is it? It will never be 100%, I know I always always think of more things to do to my car haha. But fantastic none the less.

[l0w320 0]

do a skid

[Boost Junky 1]

do a skid

Haha done!

So guess what guys? I got the monster back after work tonight and seriously WHOAAAAAAAAAAAAAAAAAAA!!!!

I am in disbelieve on how damn hard my car goes now haha.. never driven anything like it! Blair dropped me out there and followed me back, my mate also came along for the ride. Stopped in at Blairs before bringing it home.. 1st gear no traction.. 2nd gear no traction and 3rd gear whoa it holds boost upto like 5000rpm then its just all crazy steps out no sweat!

Oh and I dont know what the deal was the other day but it didnt max out at 270kw, my tuner told me tonight he just wanted to keep the tune safe so stopped at 16psi haha!

Heres some graphs to keep those of you who are interested:

ENJOY!

[|ncary 0]

Farking Hell! That must be amazing. You'll have to fix any camber issues you have in the rear to get some rubber to the road!

Nice work Luke, and I hope with all my boost related hope that the engine stays together for years to come.

You still have stock cams yes? That torque curve sure does dive after 6, some turbo minded cams would be a great investment in the future. I don't think you have any flow issues with that GT35

[oscar90 0]

so jelous! awesome!

[CamB 48]

Cams probably wont help as it appears the exhaust housing is an 0.63 which might be choking it off up top (but helping with spooling). An M50 already has naturally aspirated cams which are going to hold on to higher RPM than any typical "turbo" cam, which often have high lift, medium duration but close (or is it wide - can never remember) lobe separation.

I'd just wind it back to 12psi and enjoy. I suspect 250rwkw is enough

[E30-323ti 66]

Nice, now for a vid!!!

Not sure what your budget is looking like these days but....

You better put these on your watch list!!! phat rubber

I wonder how conservative the ignition timing is under 4Krpm???

It shouldn't be that laggy with a 0.63 turbine housing and as CAMB mentioned may be choking the topend.

Not that 270kw is anything to sniff at.

Edited August 13, 2009 by E30-323ti

[|ncary 0]

Cams probably wont help as it appears the exhaust housing is an 0.63 which might be choking it off up top (but helping with spooling). An M50 already has naturally aspirated cams which are going to hold on to higher RPM than any typical "turbo" cam, which often have high lift, medium duration but close (or is it wide - can never remember) lobe separation.

I'd just wind it back to 12psi and enjoy. I suspect 250rwkw is enough

Ahh, didn't realise it was .63, A 2.5litre does indeed top that out at 6000rpm looking back at all the turbo calcs I did a few months ago.

Tuned cams would still be a good wee upgrade in the future though

[Forrest 35]

Got two weeks to get it wof'd and certed Luke, I will be coming up for said skids, my car will be done by then, keeeeeeeeeeeeeeeeen? Loving those numbers, tis like e30 porn

[CamB 48]

Ahh, didn't realise it was .63, A 2.5litre does indeed top that out at 6000rpm looking back at all the turbo calcs I did a few months ago.

Have you figured out calcs to work out when a turbine is maxed out, coz I am super-keen to work this out for my own engine if you've got them.

[|ncary 0]

I just used the turbine, not compressor (the graphs on the right hand side of the page, graphs on the Garrett website for each turbo. And this page is incredibly handy: http://www.enginelogics.com/cmaps.html (All in imperial though, but still works)

I found that a 2.5 litre single cam (lower VE - M20) would love something inbetween .64 and the next size up that garrett does (.86) (I was looking at GT28s for my set up)(other GT series have different sizes however, like a GT32 has a .78 which would be perfect)

(One more bracket for fun)