===MAX RPM 3B family===

[20vQC]

Hi guys... well.. I always have lots and lots of questions hehe I just want to know more these cars\engines. Ok, what is the STOCK maximum rpm that some one could reach with a 3B\ABY\AAN and with the ADU???

If I have the bottom end 2.2T and the 7A or NM head (with cams)... what would be the new engine top speed in rpm????????????????????

Thanx guys!!
Cheers!


Fabio G.

[caterpillar]

stock engine max rpm?? max 7000 i think....the hyd lifters dont like mutch rpm.... and the conrod have to be bananas.....
the heavy modified s2 in finland,they does have 10500 with PO conrods and mek lifters,holset hx 55 or like that
so like the normaly home tuned engine, with new H-profil conrods, and hyd lifters max 8000rpm, after 8000 i will advice drysump oil system, and mek lifters.
the org s1 2,1 liters they does have 9600 at the max rpm........

[caterpillar]

if you want really high rpm : use the dieselblock,236mm, use 165mm(!!!!!) conrods and 86,4 or 77,4 cranc ,and really high lift camms,14+mm, and dry sump think the limit are 12000 then, before you go over 25m/s pistonspeeed......

[20vQC]

ok.... I wont go over 7100 rpm with mine...even with the NM hehehe Thanx a lot though!

[UrS4boy]

I am not sure about the 3B but the AAN "max" is limited to about 7200 RPM by the stock (and properly remapped) ECU via fuel shutoff. Presumably the factory set this "max" well under the physical limitations of lifters, piston speed, etc.

[S2central.net]

I agree that 7200rpm is the right number from ECU pov... The thought of stroker with solid cams revving to 12000rpm almost makes my ears bleed. That would be mental.

[caterpillar]

if you want really high rpm : use the dieselblock,236mm, use 165mm(!!!!!) conrods and 86,4 or 77,4 cranc ,and really high lift camms,14+mm, and dry sump think the limit are 12000 then, before you go over 25m/s pistonspeeed......

ok i was too high ; you will have a bore and stroke ratio 2,13 and may have 11000 rpm at 28m/ sek, so in race ( 402m) you may have the rpm like this... its ok. but its possible to have this kind of rpm in racecars, but in the street use

[20vQC]

well CAT... 11K rpm is A LOT!!!! hehehe I prefer to stay w\my block hehe.
I was thinking about the solid lifters but the engine will be making a lot of noise especially at idle and low rpm's.

The other option is to find some harder valve springs that could fit our heads... as the VW VR6 can use the 1.9TDI springs that are harder... so that means less valve floating at high rpm.

BTW I was planning to make a 7500 rpm fuel cut but before braking my pistons I wanted to ask you hehe

I can't immagine about a 12k or 11k rpm S2\coupe ... hahaha

[caterpillar]

in finland they do 10500 on the film( holset hx 50 or 55) they break a PO conrod, and the sound are so my hair raise on my arm....

http://www.youtube.com/watch?v=Lai8KE_P64g

[Greg_S]

Dont quote me on this but with stock running gear upto 7300rpm is possible but if that will be of much benefit depends on your overall setup

[20vQC]

Well My rev limiter is stock... I don't like to over rev too much the engine (still being the NM)... but just wanted to know what is the limit of the 3B\ABY\ect... I have only modified a lil' bit the torque and power curve to have better low end response and due to the bigger cams I needed to increase the gasoline amount from the mid to the high end rpm. Still pushing "hard" up to 7200 but the limiter comes on and fun is over hehe ( I know is not an S2power but is decent compared to other cars... soon guys... soon the 3B ) I ain't do anything else to this engine... I need to buy the nice and nasty engine hehehe BTW...sorry for my answering delay!

[mcandmar]

I scream my 7A to the limiter on a daily basis, i'm determined to blow it up now i'm building a new engine

One limit i did find was with a broken inner valve spring. At exactly 6300rpms i got valve bounce and the ecu shut things down, engine would run on 3 cyls for a few minutes and then recover. Took me a while to figure that one out as it was like a switch, bang on 6300 every time

[20vQC]

hehe that's bad luck though hehehe I just drive hard when the ambient temp is cool... When is so hot I prefer to stay home, at least I leave the car sleeping Are u going 2 stay with N\A or you're going to a turbo upgrade???

[mcandmar]

Yes i'm going turbo, it started life as an ABY engine but i'm rebuilding it with a mix of 7A,3B,ABY, and ADU bits. Think i'll call it the parts bin special

[20vQC]

hahaha nasty!!! Well good luck with the project bro! I hope doing mine next year... For these months I just have money for repairs... And hope to find a 3B at less than 1000euros. HEy...one more q! are you to leave the stock conrods or buy the stronger ones???