3.3L s50???

[SpencerM3]

If you are going FI, keep the displacment at 3.2.

I have a block sitting in my garage that was bored to 3.3 and there is barely any material between cylinders. This MUST be weaking the block, something you dont want with forced induction.

Also, with stroker cranks, you get some pretty extreme rod angles. Not worth the HUGE amount of money those stroker cranks cost.

The stock 3.0/3.2 cranks are forged, so throw in some low CR forged pistons and forged rods, and call it a day on the bottom end. This will support HUGE hp levels.

out of curiousity what is the bore on the 3.3???

i have no doubt in my mind that the s50/52 with forged pistons and rods can get up to 1000+hp with the right tuning and turbo... however i was concerned about low end torque since a turbo is all mid and upper rpm power.... i think im just over reacting though and im just seeing what my options are

I dont know the bore measurement, and dont have a tool that would be precise enough to measure it.

I'd have to ask why you want that amount of power. The only thing you'll have is bragging rights on the dyno and an empty wallet. Anything over 350-400hp is going to be useless in these cars which have issues putting down power stock.

I would personally rather put a Eurosport Twin Screw S/C on an S52. Linear power delivery and full boost around 2k RPM's. Not to mention, Jim C tuning, which is fairly bullet proof.

Just my 2 cents.

[kylebes1]

Eurosport Twin Screw S/C on an S52

how much would that cost for the m50?

I have been driving my m50 e30 for a week and I think the low end power would be fine with a turbo setup, considering even in second the back tires will lose traction with my stock m50tu.

Hell in the rain I have to take off in second and go straight to third to keep it from getting lose.

[SpencerM3]

Eurosport Twin Screw S/C on an S52

how much would that cost for the m50?

I have been driving my m50 e30 for a week and I think the low end power would be fine with a turbo setup, considering even in second the back tires will lose traction with my stock m50tu.

Hell in the rain I have to take off in second and go straight to third to keep it from getting lose.

The kit hasn't officially been released, but they estimate pricing at $7k.

[kylebes1]

shit

[BeirBrennerE30]

the twin screw is out of the question.... the most power they have been able to get out of that set up is just about 300hp and there is no proof that that charger can flow enough to get any mroe out of it... you can get that N/A and the price is incredable... i could make a turbo kit that would have 300 more horse for only $5000...

Staged turbos wont fit in an e30m50 as far as i can tell but at GT35R will.... it will make serious boost as low as 3000rpm and is good for up too 750hp.... not that i want that much... i want to be able to hang with AA turbo cars as well as my friends supercharged cobra, grand national and DSM galant.... thats why i want the power.... and 500 is easy to get on an s52.... scary easy.... ill get the power down dont worry i have a few tricks up my sleeve

[Stu]

The stock 3.0/3.2 cranks are forged, so throw in some low CR forged pistons and forged rods, and call it a day on the bottom end. This will support HUGE hp levels.

Why do you feel that aftermarket, forged rods are necessary?

[BeirBrennerE30]

The stock 3.0/3.2 cranks are forged, so throw in some low CR forged pistons and forged rods, and call it a day on the bottom end. This will support HUGE hp levels.

Why do you feel that aftermarket, forged rods are necessary?

how much boost can the stock rods take??? i know they are pretty beefy yet still cast...what precision performance's professional opinion of the stock s50/s52 rods for high horsepower/turbocharged use??? ive just always been told that when you build a high HP motor you use all forged parts but if the stock rods can take it then by all mean id love to use them... mabey just a shot peening???

[matt325is]

mine is a 2757cc (2.8l) which is rounding up a bunch.

My m20 stock rods are forged, and i heard that s50 rods are an upgrade, so they must be able to take a beating. I've run mine at 21psi, and they ahvent broke yet, so it must be a good sign.

Even with big turbo's you are spooling at low rpm. It is a lot more torque than a NA motor at the same rpm. I hear people talking over and over about: "oh turbos have no torque, its all high end" I tell them to have a ride in my car and see if its not enough torque for you. You will be surprized at how much low end pick up it has. Passing on the freeway without downshifting is the shifting is a sinch. 60-100 = nuts, even in 5th gear. anything bigger than 3.0 with DOHC, with a turbo will have some very nice torque. You will have so much of it, you wont be able to get traction anyway.

Anyway, it sounds like a HELL of a plan. It should be very fast.

good luck,

matt

[BeirBrennerE30]

mine is a 2757cc (2.8l) which is rounding up a bunch.

My m20 stock rods are forged, and i heard that s50 rods are an upgrade, so they must be able to take a beating. I've run mine at 21psi, and they ahvent broke yet, so it must be a good sign.

Even with big turbo's you are spooling at low rpm. It is a lot more torque than a NA motor at the same rpm. I hear people talking over and over about: "oh turbos have no torque, its all high end" I tell them to have a ride in my car and see if its not enough torque for you. You will be surprized at how much low end pick up it has. Passing on the freeway without downshifting is the shifting is a sinch. 60-100 = nuts, even in 5th gear. anything bigger than 3.0 with DOHC, with a turbo will have some very nice torque. You will have so much of it, you wont be able to get traction anyway.

Anyway, it sounds like a HELL of a plan. It should be very fast.

good luck,

matt

wow great info... nice to hear from somebody with a turbo e30.... i guess stock rods will be fine since you definately dont need 21 psi for only 500 hp... the more info i get the easier it seems to get big hp out of this motor...... thanks for the info everyone... kepp it comin

[SpencerM3]

the twin screw is out of the question.... the most power they have been able to get out of that set up is just about 300hp and there is no proof that that charger can flow enough to get any mroe out of it... you can get that N/A and the price is incredable... i could make a turbo kit that would have 300 more horse for only $5000...

Staged turbos wont fit in an e30m50 as far as i can tell but at GT35R will.... it will make serious boost as low as 3000rpm and is good for up too 750hp.... not that i want that much... i want to be able to hang with AA turbo cars as well as my friends supercharged cobra, grand national and DSM galant.... thats why i want the power.... and 500 is easy to get on an s52.... scary easy.... ill get the power down dont worry i have a few tricks up my sleeve

You need to do some research before spouting figures that are false.

The BASE (stage 1) Twin Screw kit made 345+ rwhp (over 400 crank) on their test E36 M3. The stage 2 test car, which only has the additon of cams, produced 365+ rwhp. All on 8psi. They are developing high boost, low CR kits for the future.

The kit has HUGE potential. They are using the largest S/C pulley avaliable from the manufactorer and have plenty of breathing room to go. Just take a look at the compressor maps, and you'll see its got plenty of potential.

The turbo vs. S/C debate is all a matter of personal preference. Either one is capable of producing tons of power, but it all depends on how you prefer your power delivery.

Why do you feel that aftermarket, forged rods are necessary?

Why not? :?

If you are going to tear down the motor for a rebuild, you might as well strengthen the rods as well. According to Karl Huge at AA, the stock rods start to flex around 500 crank HP. Throw in some E36 325td (i believe it was a 2.5L) rods or forged aftermarket rods, and it should be solid.

I guess its all a matter of opinion and budget, since I have never see any solid data that shows where the stock S50/52 rods are actually at their limit.

[iXer]

Even with big turbo's you are spooling at low rpm. It is a lot more torque than a NA motor at the same rpm. I hear people talking over and over about: "oh turbos have no torque, its all high end" I tell them to have a ride in my car and see if its not enough torque for you. You will be surprized at how much low end pick up it has. Passing on the freeway without downshifting is the shifting is a sinch. 60-100 = nuts, even in 5th gear. anything bigger than 3.0 with DOHC, with a turbo will have some very nice torque. You will have so much of it, you wont be able to get traction anyway.

Well said Matt.

/Mattias

[Charlie]

Why are you guys looking to build hand grenade motors for a street car?

-Charlie

[BeirBrennerE30]

the twin screw is out of the question.... the most power they have been able to get out of that set up is just about 300hp and there is no proof that that charger can flow enough to get any mroe out of it... you can get that N/A and the price is incredable... i could make a turbo kit that would have 300 more horse for only $5000...

Staged turbos wont fit in an e30m50 as far as i can tell but at GT35R will.... it will make serious boost as low as 3000rpm and is good for up too 750hp.... not that i want that much... i want to be able to hang with AA turbo cars as well as my friends supercharged cobra, grand national and DSM galant.... thats why i want the power.... and 500 is easy to get on an s52.... scary easy.... ill get the power down dont worry i have a few tricks up my sleeve

You need to do some research before spouting figures that are false.

The BASE (stage 1) Twin Screw kit made 345+ rwhp (over 400 crank) on their test E36 M3. The stage 2 test car, which only has the additon of cams, produced 365+ rwhp. All on 8psi. They are developing high boost, low CR kits for the future.

The kit has HUGE potential. They are using the largest S/C pulley avaliable from the manufactorer and have plenty of breathing room to go. Just take a look at the compressor maps, and you'll see its got plenty of potential.

The turbo vs. S/C debate is all a matter of personal preference. Either one is capable of producing tons of power, but it all depends on how you prefer your power delivery.

i have done my reasearch.... you should check out bf.c forced induction section.... the euro sport twin screw is producing less power than eurosport claims and only at mild boost levels(less than 15 psi)... its just not an option for me.... i would not be satisfied with even 400 at the crank... for some poeple the TS is the right choice but not for me...

and charlie....i dont see why people say things like that.... like just cuz its an e30 it will never be fast.... i bet in less than 3 years i will have an e30 with 500rwhp and it will be as relyable as any other car.... its all in the design and the quality of parts used

[MattM20]

Re: 3.3L s50???

So how do you get a 3.3L out of an s50 or s52??? no one seems to be able to tell me!!!

i know the thread has gone elsewhere, but to give you another option to look at is the possibility that the people with 3.3's are using alpina cranks. alpina has been using a 93.8mm stroke since the M52TU engine which would yield 3.3 almost exactly with a 86.4mm bore.

[BeirBrennerE30]

Re: 3.3L s50???

So how do you get a 3.3L out of an s50 or s52??? no one seems to be able to tell me!!!

i know the thread has gone elsewhere, but to give you another option to look at is the possibility that the people with 3.3's are using alpina cranks. alpina has been using a 93.8mm stroke since the M52TU engine which would yield 3.3 almost exactly with a 86.4mm bore.

interesting..... i didnt know alpina made such a crank...

does the dual vanow of the m52tu make and difference over a normal m52???