looking for next engine (turbo). I need opinions

[AiToR51]

Yesterday I broke again another 2.0 dohc 8v turbo engine  @ 1 bar with 255bhp and 338Nm. So I'm looking for a more reliable engine and more powerful/torquey. I didn't have any power bellow 3500 rpm with 2RM cosworth T3 garrett turbo.


I've four options:


forged 2.0 DOHC 8v
PROS:
- I've exhaust manifold, injectors and forged conrods without use in house.
- No more problems than now in Spanish "MOT"
CONTRAS:
- less powered engine


forged 2.0 + 2.0 16v scorpio head:
PROS:
more powerful than now
CONTRAS:
I would need new exhaust manifold and injectors.

In the 2.0 engine I would need to install a better turbo with lower rpm spool, or a VGT or turbo + compressor


2.9 24v BOB + turbo
PROS:
-I've one in house, so less cost.Anyway, I could sold it if I decide to go with another engine.
-I like electronics so this engine is more fun in this way, more wires haha
-More fuel efficient than the 2.9 12v
CONTRAS:
-Not cheap engine rebuild, expensive chain guides


2.9 12v from scorpio. There is one in my town scrapyard with manual MT75 V6 RWD which is good and I will buy.
PROS:
- cheaper to rebuild compared with the bob
- only 1 camshaft, and cheap kentcams
CONTRAS:
- less efficient and probably I would need more turbo pressure to have same power as the BOB?
(It has lambdas, so is one of the lastests 2.9?)

CONS of V6:
- weight
- less space

I want more than 300 bhp. I know than BOB @ 0,6 bar is reliable and gives more than 300bhp. But I also read on this forum that many people preferes the 12v.


In future I would like to install 4x4, so 6 cyl is better, more torque in low rpm



I'd like to install a 2JZ or RB26DETT but in spain is near impossible to legalize , V6 ford is easyer

thanks

[cossiemk2]

Could you not build a turbo 2.0 Zetec?

They are very cheap and reliable.

[AiToR51]

Could you not build a turbo 2.0 Zetec?

They are very cheap and reliable.

mmm, there are not a lot here. But do you have any example of how much work would it have to install and the results?

[TimoXr4i]

i've seen a lot of zetecs turbo on turbosports and passionford, iirc you could use escort turbo manifolds, or, when you fit it in a sierra, you have quite a lot of room left, so manifolds won't be such a problem... use the DOHC turbo exhaust further, and use a modern turbo, like a gt series. easy fit with the mt75 box already in your car?

or else, build a v6 24v turbo, a bit more expensive, but you don't need other pistons or such to get 300 horses, engine will have quite an easy life depending on the right turbo and an good ECU!

[AiToR51]

yes, I'd like an 6 cyl engine because they make a lot of power with a big turbo (less heat) and not too much boost.
for ECU I've a Megasquirt and a FreeEMS (in development) both fully programable.

In my 2.0 I limited boost on low rpm to 0,6 bar. Only 1 bar over 5.000 rpm. It lasted around 12k miles with stock rods, pistons and stock CR with just metal head gasket but with more overlap camshafts so less dynamic compression.

with 4 cyl is all more dangerous as it would need more boost, and now I don't have a lot of free time (a lot of work in job), and the zetec turbo swap would require it. so the zetec option is harder

[robrs2]

have a look here http://www.powermaxengineering.com/powermax%20sierra%20finished.htm

[AiToR51]

have a look here http://www.powermaxengineering.com/powermax%20sierra%20finished.htm

mm It seems good. I'd like to know how it feels because it has very low comp.. Probably too low for daily use when there are a lot of moments without good boost.


I had an 2.0 DOHC engine with C20XE forged pistons with 2mm less of compression height compared with stock ones, which gave around 8:1 CR and I didn't like that engine.. It was very lazy without boost (less than 100hp i could say), it needed more spool time... more boost to gave the same amount of power..