e30 316 build x2 (m52/m50, turbo, 3pcs bottle caps etc)

[econti]

Wow that's some good power!

[pazi88]

Thanks for the info.

Any concern about those ARP2000 bolts being fake? I doubt ARP would produce them with like that.

Those are genuine.

https://www.mgexp.com/forum/mg-motor...2265921/page-2

I Just got off the phone with Zack at ARP, he works in the tech dept., he confirmend that Maxspeeding is indeed using ARP rod bolts, and confirmed the batch number on the bolt in these very rods, all ARProd bolt will have ARP (model number), in this case 2000, the a dash and manufactuering batch number, that tell ARP, what batch they were made in, by checking that number they can confirm the exact size of bolt that made in that batch, according to ARP, the batch number would make it nealry imopssible for them to faked, they could put a batch number on there, but it would not match ARP records, in this case it did.

Rod bolts are ARP 2000 part# 200-6209, 3/8" diameter, 1.600" under the head length.
The actual bolts in this set of rods, batch number matched ARP's records, and were confirmed as authentic ARP 2000 rod bolts.

[Northern]

Thanks for the info.

Any concern about those ARP2000 bolts being fake? I doubt ARP would produce them with like that.

[pazi88]

What rods are you planning to run?

Did you hear anything from Racing Diffs about why your caps needed to be modified? I just bought their kit for 2.79~3.07 and wondering if I'll have the same issue.

I also have forged pistons coming. But the setup will be bit special, so not just upgrade to forged internals.

Haven't contact racing diffs about the problem. But I heard from few other guys that they will change the LSD cap dimensions for better. But don't know if they have actually done that. In any case, measure the thing, before bolting it together.

We also took the ONE for dyno:

https://www.youtube.com/watch?v=OD3zlwrN3B4

[Northern]

What rods are you planning to run?

Did you hear anything from Racing Diffs about why your caps needed to be modified? I just bought their kit for 2.79~3.07 and wondering if I'll have the same issue.

[econti]

10.8 is good numbers, unfortunate about your engine but I guess it's a good excuse to rebuild bigger and better

[pazi88]

What do you think it is?
i had a problem like that it turned out stock ring gaps don't like the heat and broke every land.

Well. Spoiler alert!

I already pulled the engine:


And tore down the engine. Number 1 and 5 pistons had cracked ringlands. No signs of piston rings binding so rising the boost at max torque point was what killed the engine. Too much cylinder pressure for the stock pistons. The stock pistons seem to handle about 600nm of torque. The 1.1-1.2bar of boost is 700nm or more which was too much.


Otherwise engine was mostly ok. No scratches on the bores and bearings looked normal. Only few had marks of some piston fragments going through the bearings.


Should be easy rebuild and I have already started gathering parts, now that I know what I need to get.

[pazi88]

I see the flare was ripped off. And I assume those black marks are just burned tire. How badly damaged is Petri's E30? Both of these car are amazing.

It is too bad about your car. I guess it is time for another upgrade.

It will buff out :D The tire just lost the whole thread section and it flapped against car. Destroying the flare and made the black marks.

[LowR3V'in]

What do you think it is?
i had a problem like that it turned out stock ring gaps don't like the heat and broke every land.

[rzerob]

I see the flare was ripped off. And I assume those black marks are just burned tire. How badly damaged is Petri's E30? Both of these car are amazing.

It is too bad about your car. I guess it is time for another upgrade.

[pazi88]

But well on the other hand Petri's e30 did finally run tens at the drag strip:







Video about that: https://www.youtube.com/watch?v=Oc8ntErJSD0

Seems like youtube wants to demonetize that video. Maybe e30 running tens is too much for it :D

[pazi88]

ok continuing. After bimmerparty I took the car to dyno to see if it's still healthly and if my tuning efforts have made the torque and hp curves smoother:


And yes it is. The hp number is bit high. Maybe because slight mismatch on the RPM axis. But yeah it's healthy and curve shapes are finally what I wanted.

After that it was time to head to the track. I lowered the RPM limiter from 7500 ish to 6900 and raised boost around the 4500-5500 area for easier skids. Here's video of that: https://www.youtube.com/watch?v=elD_Y4-Ftu8

But well the engine didn't like continuously flooring the throttle for many laps and started raising oil temps. First I wondered that maybe it's just oil cooler issue, but the engine started breathing badly and puking out oil. So I knew I had blowby issue.


I did stop there and headed back home. On the way back the engine started smoking really badly.


So it was time to haul the car back to garage and end the summer season early:

[LowR3V'in]

Wow this new forum version sucks...

yes.

[pazi88]

Next morning it was then time to head towards bimmerparty with proper dragweek look:


No problems during the trip but slight oil drip from diff cover (I did mes up the sealant). Then first was the 700m speedrun:


Resulting 247km/h.

Petri didn't take part in Autoslalom but did some burnouts:



But it was quite short burnout because engine was losing power after launch control. But fortunately it turned out to be our old tune for drag racing that did drop out power after launch to keep traction.

But well. Next day it was time for 1/4 mile drag racing. Goal was to run tens.


First try was launch at 4000rpm without boost. Time was 11.4(video).
https://pazi88.kuvat.fi/kuvat/Projek...704-WA0006.mp4

There was so much traction that we raised the launch to 4500 with 0,5bbar of boost and tried again:


Resulting: 11.7s. Petri said that the ZF had totally lost fourth gear. Luckily there was time for third run which resulted 11.369 and 214.79km/h. Well still long way to running tens.

Here is video of our bimmerparty trip:
https://www.youtube.com/watch?v=_t61aQGHkOk

[pazi88]

Then Petri's e30. We did got CrMo axles for it:


Which Petri installed:

Petri also managed to melt the clutch disks in the stock LSD (video):
https://pazi88.kuvat.fi/kuvat/Projek...622-WA0013.mp4

He told me that the car was really dangerous to drive with that :D So day before bimmerparty I went to our garage to build new diff:


Recipe was e34 typ188 diff casing that we had prepared earlier. e36 328 2.93 ratio, e30 325e LSD unit. Racing diffs 4-clutch conversion set. e28 bigger drive flanges, e39 525D big input flange and all new bearings and seals.

Again this racing diffs 4-clutch conversion set required some modification to fit.



Little bit shimming to get correct preload for side bearings and more shimming to get correct bakclash:


But the tooth contact was still miles of. It did require three tries to get that correct.


And after that we could finalize the diff assembly and mount the diff with new axles: