Laimis E30 325i 24v Turbo

[korona]

Jeśli ktoś przeoczył lub nie rozumie o czym pisze autor: 0,87bar doładowania, prawie 390KM na kołach co daje ok 430KM na silniku przy seryjnym stopniu sprężania (seryjny, nie odprężony silnik). Jak to możliwe? E85 + potężna turbosprężarka; bez E85 lub na małej turbinie taki wynik nie jest możliwy do osiągnięcia.

[Laimis]

1. org . pistons and 10:1?

2. how big boost?

3.arp head screws ?

4.custom head gasket or orginal?


CR unbelievable that it all works.
I'm impressed, nice car, nice job.
p.s. my e36 generated 1,2bar 550HP and 700nM (e85)

Thanks

1. Yes
2. Up to 2.5bar
3. No. Custom made
4. Original

You want higher CR for alcohol fuels (Ethanol, Methanol), you will make more power and have better turbo spool, better fuel efficiency, etc.
9.5CR is optimal for E85 on 4 valve engines.

Upload more photos My questions:
I saw that you have got a carbonfibre front hood. What is the difference in weight? I mean stock vs carbon.
How did you install this quite big intercooler in the front of E30? (photos please).
Give me a part numer of these VAG coils. How big spark gap have u set up in your spark plugs?
Great car by the way, very refined!

Good to hear You like it. It's a fiberglass hood + 3M carbon fiber look wrap If i recall correctly, stock E30 hood weights ~20kg with all hardware, fiberglass ~5kg.
Unfortunately i don't have any pictures remaining of IC fitment work. But you will clearly see which parts you have to cut or remove if you want to fit it there, no big deal though.
I will get VAG part # later. I have not tested them much, for now i use original 0.8mm gap but eventually i will go with 0.6.

Hello Laimis.

I am really impressed with your engine setup. Have you honestly had stock bottom end with CR=10:1 and boosted it 2.5bar? What was the spark ignition timing at WOT then? I am asking you out of curiosity, because many of 1JZ or 2JZ engines I have tuned at higher boost like 1.3-1.5bar needed to be around 8-10deg of spark advance at WOT to protect them from engine knocking. In Poland we run at PB98 though.

I like your workshop. Regards,
Michal.

Michal, you need to try E85, its a day night difference comparing to gasoline. CR is not an issue, for example PPF E21 race car - 9.5CR S50 1300HP on E85.
I don't have to prove anything, but i can tell this: it is not possible to replicate all this with small turbos, gasoline and piggyback. It also requires advanced tuning knowledge. But what you say is true.











That car made 675WHP @ 1.75bar (DIN) to the wheels.
M50 2.8 NV, 9.5CR, stock pistons, rods and head gasket. Custom head studs and O-Rings.
Holset HX52 16cm, full boost on the dyno at 4000rpm.

Took few clips today http://www.youtube.com/watch?v=VPeJC6We ... e=youtu.be" onclick="window.open(this.href);return false;
Yes, the road is cold now, but 10jx17 245-255 R17 and 0 degrees of camber in the rear helps a lot.

Hope you like it

[korona]

The engine revs up to 8000rpm, so its plenty of powerband.

I look on Your dyno result, and from 6000rpm power and Nm both fall straight down, its serial head M50 engine cant flow more (i marked it on photo). So why You spin it that high?

[Laimis]

Korona, I think it was a soft rev limiter which started to kick in. At that time i was testing the Dynapack machine and getting used to it. The result was not a concern. Once i'll have final numbers i will post them here.
You can improve breathing with dual intake cams and proper cam timing.
It will still make decent power with OEM cams and stock ports though.
Ported heads and aftermarket cams requires less boost but worse spool time is expected.
On the othe hand, the integrity of highly ported head can be compromised,
even stock NV heads are famous for cracking between valves and spark plug.

Here is a dyno sheet of Widebody E30



I don't have final 675WHP graph in this computer, but you can get an idea.
It took two full days to tune it carefully because stock parts will not forgive mistakes.
That engine could make even more power, but we were limited by intake temperature at the end (70C).
The Intercooler was to small (450x300x76) and poor ventilation behind M-Tech2 body kit.

[Karolo]

You can improve breathing with dual intake cams and proper cam timing.

Can you describe some details of this idea? What exactly means proper cam timing? Upload some photos.

[korona]

Can I ask for some specification and photos of custom head studs? How it cost compare to ARP?

[Laimis]

You can improve breathing with dual intake cams and proper cam timing.

Can you describe some details of this idea? What exactly means proper cam timing? Upload some photos.

The camshaft needs slight machining for the cam sprocket, it can be easily seen when you have both cams in your hand.
Cam timing is where the dyno comes handy, you can find a sweet spot doing the testing.
It's a N/A M50 with aftermarket cams but the procedure is the same.

[Laimis]

Can I ask for some specification and photos of custom head studs? How it cost compare to ARP?

I will try to find a picture for You in the evening. But there is nothing special about these studs, same M10 size, 12.9 class. The reason of this part was the cost i think it was 100EUR for a set or so.
But next time i will go for ARP2000 (bought a set already), they have smaller nuts and don't need to remove both camshafts to retorque the studs, so you don't loose the cam timing.