Supercharged 8V.....230Hp?

[lahondal 17]

Hi!

 

Only its a simple question....do you think is possible to reach 230hp with an Eaton m62 supercharger, mounted in a 2.0 Turbo 8v engine?

 

I think the stock boost is around 0.5bar/7psi.....and with the charger i dont know if i can have 1bar/14psi or more...

 

What do you think?

Edited August 24, 2012 by lahondal

[joris_andriesse 8]

Instead of or together with the original turbo?

[lahondal 17]

Instead of, i dont know if a M62 can blow 1bar or more.

 

I want to build a rally car with forced induction without LAG and i want to know if an Eaton m62 do the work to reach 230hp or I must buy a good centrifugal supercharger.

 

David.

[allanallen 528 2 Cars]

Even the older generation m62s can flow enough for 300hp. You have to remember though that once you start going higher than 10psi they start to loose efficiency and produce a lot more heat. That's not to say that you can't do it.

 

I'm not convinced its worth messing about with 8v turbo bottom end for that sort of power. A higher compression 16 valve engine will make 250hp on just over half a bar, bit of a no brainer in my opinion.

[lahondal 17]

I start with the turbo 8v bottom end because the project was first a big turbo 8v project, and I already have this block in house...but later thought (s**t!!), that the LAG will be monstrous, yes i´m a no brainer.....and in rallying I need to go between 40 and 100km/h many many times, and LAG is a big enemy against the clock.

 

And yes, 16v is the clue, but I want to stay 8v, i like the 8v engine (althought the 16v its better).

[joris_andriesse 8]

I think the 8v is fine for what you are looking for, because of it's low rpm torque power. You might think of also improving your inlet, by for example using a 1.9 8v inlet in combination with an gti6 throtle body. The heat problem can be solved (mostly) by optimize your intercooler.

[welshpug 1,661]

the 8v does not "produce good low rpm torque" a 16v will outperform it EVERYWHERE.

[lahondal 17]

the 8v does not "produce good low rpm torque" a 16v will outperform it EVERYWHERE.

 

I know, but the 8v have something special that the 16v doesn't have, only for me of course. I feel like if I put a 16v in the GTi I'm killing it a bit.

 

So a good design of intercooling can mostly overtake the heat problem of the roots efficiency? Or simply im wasting the time.

[welshpug 1,661]

but youre supercharging it

[lahondal 17]

Yes

[madspikes 41 1 Cars]

I'll sell you my supercharged 1.9 8v GTI.... ;-)

 

Mine is making ~180bhp from 0.4bar, using a E45 charger.

 

I have a project thread http://forum.205gtid...opic=66898&st=0

 

Feel free to PM for any info.

 

Mad

Edited August 26, 2012 by madspikes

[lahondal 17]

I'll sell you my supercharged 1.9 8v GTI.... ;-)

 

Mine is making ~180bhp from 0.4bar, using a E45 charger.

 

I have a project thread http://forum.205gtid...opic=66898&st=0

 

Feel free to PM for any info.

 

Mad

 

I already have readed all your project thread.

 

For buying your car...its a bit difficult, here we have a ferry which go Santander-Plymouth-Santander every week, but the RHD car aren't for me for now...thanks anyway.

 

By the way, there in the UK the rally cars are awesome cheap! I´m thinking in buy a rally car, take it here to Spain, and mount all pieces and bits in a LHD shell. Will be lots cheaper than buying here a rally car.

 

My problem is the CR, you started with a stock CR of 9.6:1, isn't it? I start with a CR of 8:1 (turbo block), and i will need more boost than you for achieving the same HP. 1 bar minimun i think for 200hp.

[madspikes 41 1 Cars]

Hell, not sure I could sell the pug anyway... had it too long!

 

I started with the 9.6:1 compression ratio.

 

Do you have any ideas on how you'd mount the larger M62 charger?

[lahondal 17]

Hell, not sure I could sell the pug anyway... had it too long!

 

I started with the 9.6:1 compression ratio.

 

Do you have any ideas on how you'd mount the larger M62 charger?

 

I´m thinking mount it in the upper side, above the alternator, is not a lot of space with the starter motor fitted, so I try to fit it there.

 

I would love buying a centrifugal charger, but its sooo expensive and i dont know if my wallet will endure...will search in ebay....but first I need to sell my BIG turbo...

[wicked 103 3 Cars]

I doubt if the engine (as is) would make a could combo with the charger.

The engine needs (relative to a 16v) a lot of boost to make 230bhp.

 

This is the flow graph of a M62:

 

You need about 360cfm to make 250 bhp. But the 8v won't eat 360cfm @ 10psi. You'll need more pressure, or make it flow beter (better cam, inlet,... )

 

 

Making more pressure with the chargers, means a lot more heat:

 

And power loss:

 

So with a supercharger, I would opt for engine with a higher compression (dkz), wilder cam (can be wild N/A cam, since you don't have back pressure from the turbo) and low pressure.

 

Or use a smaller turbocharger....

Edited August 27, 2012 by wicked

[lahondal 17]

I have the DKZ cam ready for fit, and the plan is build a custom inlet manifold, maybe with 306 gti plenum. The exhaust ports are bigger at the moment and i want to make 3 angle seats on exhaust. Stock valves.

 

The block is fully rebuilded (avatar pic).

 

Anyway, i´m seeing that making 230hp with a roots charger and a low starting CR its difficult, not imposible, but requires a lot of effort, so I need to re-plan the project and squeeze my brain, even more...

[stef205 92 1 Cars]

16v engine and m45 charger thats around 250bhp

[wicked 103 3 Cars]

I think your answer is cheaper than expected:

 

http://forum.205gtid...howtopic=143787

 

Compromise a little on your 'NO lag' requirement and you're done....

With a little revy gearbox, you'll only notice some lag in first gear....

Edited August 30, 2012 by wicked