Zetec performance rebuild option

[jordway]

Oops... Sorry.  The Zetec SVT is 170hp (not 185).  So, 200hp is probably about right.

[Vovchandr]

Arbitrary 200whp would be my happy goal on a Zetec. As it sits it dyno'd around 140 so 50% increase would be plenty. Do you know how many PSI pully you're running?

 

How does the SC whine sound?

[jordway]

@Vovchandr, here is the sound...  I don't recall about the pully, but I'll check.

 

 

[Vovchandr]

1 hour ago, jordway said:

@Vovchandr, here is the sound...  I don't recall about the pully, but I'll check.

 

 

Thank you! So much theater. I love it!

[CarlB]

I got my engine back from Quicksilver yesterday. The engine made 225 HP and had a very flat torque curve from 4500 to 7500. The combination is: 11.5 to one compression ratio - SVO length rods - Oversized valves - Kent Focus 3 cams - Ported head - 50 MM throttles - New collector and muffler. The engine runs on pump gas and has a conservative tune. The exhaust gas temperatures are just under 1300 degrees. Vovchandr   The dyno sheet I posted at 180 HP is probably low. That dyno sheet was done with the header Quicksilver uses for the Formula C engines they build. One of the chokes to keep the speed down is a small tube header. Quicksilver ran my engine with that header first because it has individual EGT measurements and when they put my header on the engine it picked up 10 HP

[CBuff]

Sounds like you might be tough to beat in njmp in June.  

[pethier]

I have a RHD car and am about to put in a Zetec sourced from a Birkin.  Not thinking about a supercharger at this time but who knows?  If I do go boost, I would not go turbo.  I like to autocross, and turbo lag is unlikely to be a friend to me with my natural driving talent.

 

My friend Steve sold off the Webers and put on Mikuni* ITBs with adaptors.  Ran it on Megasquirt.

 

* Actually Suzuki Hayabusa Keihin/Denso injection.

Edited May 25, 2025 by pethier
I was wrong.

[Vovchandr]

RHD Zetec in an S3 might severely limit your options with steering going right through where supercharger hardware would go. You're likely going to need an NA build if you don't want turbo. 

[pethier]

On 5/7/2025 at 11:38 AM, Vovchandr said:

RHD Zetec in an S3 might severely limit your options with steering going right through where supercharger hardware would go. You're likely going to need an NA build if you don't want turbo. 

Yeah.  I read your April 23 post too-quickly.  I see what you mean now.  

 

I'd like to have a Duratec, but this Zetec opportunity was too good to pass up.

 

Realistically, I'm building a fun autocross car, not a Nationals winner.  I have no intention of putting on very wide wheels and running hillclimb tyres.  So a normally-aspirated Zetec on Mikuni* fuel injection may be all I need.  Steven DID have wide wheels with hillclimb tyres on the "donor" Birkin.  I assume he will still use them when he gets all the electrons working.

 

I might someday consider wider wheels, but I think Yokohama A052 tires will still be the best bet for me.  I can run those in XU class.  My Cayman is also legal in XU (and not in DM) so I can run in the same class.  Good thing, since the Cayman will have to step up during the Zetec-swap on the Seven.  If things go well, the Zetec and the Seven should be sleeping under the same roof by this time tomorrow night.

 

* Actually Suzuki Hayabusa Keihin/Denso injection.

Edited May 25, 2025 by pethier

[pethier]

17 hours ago, pethier said:

If things go well, the Zetec and the Seven should be sleeping under the same roof by this time tomorrow night.

Parts and car are together.  Good news, the bell housing is aluminum.  The sorting-out process will begin.  The heater is out.  The front fenders are tucked away in a safe place to give us some fettling room.  I know, I need to start my own build thread.

[MV8]

How is that build topic coming along? Oem mikuni mpfi with no plenum sounds ideal.

[pethier]

2 hours ago, MV8 said:

How is that build topic coming along? Oem mikuni mpfi with no plenum sounds ideal.

Yeah, I've just been doing nothing for those 14 hours. /s

 

I've staked out the turf:

 

Now  I'm off to pay my first-half property tax.

 

Thanks to all for what I have learned in this thread and for your patience with my tangental thinking out loud.

[pethier]

On 5/9/2025 at 8:09 AM, MV8 said:

How is that build topic coming along? Oem mikuni mpfi with no plenum sounds ideal.

I have been wrong.  It's actually Suzuki Hayabusa Keihin/Denso injection.