Kamotors E30-Turbo to ITB M20

[Denny]

Real dyno anytime in the future?

+1.. I would love to see how accurate it is compared to dyno. But seing you have been using the same way to measure progress its a great tool to tell you if your going the right direction. Before I hit the dyno and I can do a WOT run I will try it too.

[Pootis]

What virtual dyno program do you use?

[kamotors]

this one http://innovativetuning.wordpress.co...-virtual-dyno/

[kamotors]

so was my map too aggressive? It was as fast as I would ever need, I only made two 0-120mph pulls before it popped.
AFR was 11.8 and tapering down to 11.2 by redline to help keep coolant temps cool. under boost It ran smooth as silk, plugs look fine/a bit black, exhaust is now white and steaming. Pulling head ASAP.
here is the tune the gasket popped on.


here is my retuned version that I wont blow up on.


started the tear down again.

[TheTacoMan]

Popped like a water balloon, good times waiting to get it towed at mcdonalds parking lot.

It was insanely fast to 120, I was looking at the boost gauge but im pretty sure it spike about 23psi. I got bored so pictures...

[MR 325]

Whoops! Had a little too much fun! Good thing you're a head swapping pro these days.

[whodwho]

so was my map too aggressive?

Are you close to having the final hardware you are going with in place?

Looks like it is time for having it dyno tuned for spark, that is the way to get a safe tune with just the correct amount of advance.

[Denny]

Popped like a water balloon, good times waiting to get it towed at mcdonalds parking lot.

It was insanely fast to 120, I was looking at the boost gauge but im pretty sure it spike about 23psi. I got bored so pictures...

Courage Kam ...you will get her back up in no time at all am sure.

Soooo approx 23 PSI.... is the limit of the head gasket even with ARP studs...

Thats one of the reasons why am re-puly'ing my Supercharger and turbo down to max 17-18PSI with timing done on the dyno... If I go WOT right now I will be in the same boat.

[kamotors]

Courage Kam ...you will get her back up in no time at all am sure.

Soooo approx 23 PSI.... is the limit of the head gasket even with ARP studs...

Thats one of the reasons why am re-puly'ing my Supercharger and turbo down to max 17-18PSI with timing done on the dyno... If I go WOT right now I will be in the same boat.

yeah here is my new out look on the M20.

0-10psi=stock headbolts,can get away with WAR or other tuning methods
10-16psi=ARP head bolts+MS
17-20psi=+wasted spark
20-23psi=+welded coolant channels
23+psi=Build the snot out of it- ARPs,welded head,oring block and beefy lower end.

obviously there are exceptions, for example I got a away with 23psi on my stock head and 23yr old head gasket for several small pulls without issue. It is this new head and head gasket that blew on a more aggressive tune at 23psi within 2 very long pulls.

[sayed ali]

Soooo approx 23 PSI.... is the limit of the head gasket even with ARP studs...

Thats one of the reasons why am re-puly'ing my Supercharger and turbo down to max 17-18PSI with timing done on the dyno... If I go WOT right now I will be in the same boat.

Not 100% correct, but yes, the stock hg may not survive @ more than 25psi even with ARPs and MS. Unless you get the block o-ringed + perfect tune.

O-ringed Block + ARPs + TUNE should do +25psi with no issues .. Like this Sweden man said
"im using an standard elring bmw gasket.. but with an custom setup of o-rings with an reciver grove for the gasket to fall down to."

He is running ~2.5 bar of boost :)

[wazzu70]

Rating a head gasket for a psi limit makes no sense. Psi in your intake manifold from different turbos can be wildly different cfm and very different IATs.

A stock head gasket and studs is plenty strong.

What kills engines (and headgaskets) is improper timing maps most of the time. The headgasket is just a fuse thats supposed to give when cylinder pressures get too high to keep from blowing your bottom end through the oil pan.

Trying too hard to seal the head to the block is just going to cause a really expensive mess unless you can prove the head is actually lifting (spike in coolant pressure). Its always a cause for concern when you are running more timing than everyone else and dont have a way to log its OK!


Hopefully the OP gets this back together with a verified timing map for lots more fun!

[kamotors]

yeah , I never put a psi limit on the head gasket. On my car coolant temps raise about 8-10degrees during a pull and MAT does just about the same.

I've checked my plugs out and there are no signs of detonation, mainly because detonation is extremely hard to induce with methanol injection. I was only 3 degrees more advanced that other well known timing maps of E30's that run solely on 91-93 octane. I believe the head lifted as I was WOT in 4th gear, 23psi and it was running smooth as silk, I didnt even know anything was wrong but then I looked in my rear view mirror and noticed I was leaving a mile long wet tire mark. I looked at my gauge saw that it was pegged red and pulled into a mcdonalds parking lot and shut it down. I opened the bleeder and nothing but steam came out, I waited a bit and then refilled where it immediately began to overheat once the coolant res. cap was closed and steam was coming out the exhaust.

I'm just waiting on parts now, car is just about stripped down and ready to pull the head off.

[kamotors]

took away some more timing near peak torque.

[kamotors]

at least its an easy fix.

[LowR3V'in]

Detonation.