60 replies to this topic

[speedster]

If you are aiming for Hp you need to pulse tune Your hedder. Use the opening time BTDC for the exhaust cam. Determend primary length and use that number to make out the ID for tubing.

 

Here is my numbers 233 rwhp! 4-1 hedder,  3" Down to the catalyst, and 2,5" the rest. Primary is 2" tubing.

 

42 mm AT Power TBI.

 

 

What engine build specification is giving you this power curve BAre? 

[wizzard8]

here is mine. 4-2-1 custom built.

Attached Files

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[Captain Vimes]

Does that fit under the clam without modification?

 

Why can't after market exhaust makers supply systems like this? Is it really much more complicated and expensive than what is already on the market?

[vocky]

I designed mine for maximum road power, so it's a 4-2-1 with loads of extra mid range torque

 

Should have about 200 ft lb of torque with my 2494cc engine, so 200 x 7500 / 5252 = 285, I wish   

 

Edited by vocky, 21 September 2013 - 12:02 PM.

[wizzard8]

yes it fits perfect. it was a project couple years ago in germany when some engineers and a former exhaust maker designed this. it's good for an extra 20hp and better torque in mid revs. maybe 5 were built but demand was low as supercharging become more popular with our cars and so more horsepower for the money.

[BAre]

 

If you are aiming for Hp you need to pulse tune Your hedder. Use the opening time BTDC for the exhaust cam. Determend primary length and use that number to make out the ID for tubing.

 

Here is my numbers 233 rwhp! 4-1 hedder,  3" Down to the catalyst, and 2,5" the rest. Primary is 2" tubing.

 

42 mm AT Power TBI.

 

 

What engine build specification is giving you this power curve BAre? 

 

 

Original 2.2 bottom with balance shaft delition kit and 5kg flyweel.

Patriot Performance CNC ported head (+0.5 valves) and compcam stg 4 exhaust/stg 3 inlet.

Homemade race hedder tuned to 89 degree BDTC exhaust opening.

AT Power 42 mm shaftless throttle bodies

Homemade inlet manifold.

 

The engine is restrickted to 7000 rpm due to the fact that piston and rods is original.

[wizzard8]

what does bdtc mean? my english seems not elaborate enough to understand. you are running itb right? regards from germany markus

Edited by wizzard8, 23 September 2013 - 10:20 AM.

[oakmere]

Get some Eagle rods in and see what the engine is putting out at 7800 rpm. I assume the valve springs are already up rated with those cams?

[BAre]

what does bdtc mean? my english seems not elaborate enough to understand. you are running itb right? regards from germany markus

 

BTDC is Bottom Top Dead Senter, but I use BDC as term in Norway. The exhaust cam open 90 degree before piston goes in it`s lower positione known as BDC. This is used for timing the reverse pulsing correct for creating vacuume that raise the VE at some point in the Rpm scale.

 

I use ITB from AT Power with homemade inlet manifold. AT Power relised a 30 mm DOHC inlet manifold for Z22SE last week.

 

Oakmere:

The cams go to 8500 Rpm :-)

And yes the head is fully prepped for 9000 rpm.

[BAre]

 

Forgot the hedder pic....

 

 

Nice! Where did you get the manifold, bends and the collector?

 

Pulse tuning..... NA tuning is so much more fun than boosting

 

 

Collector is 3.5" Chevy. The rest is hommade from 2" simmons exhaust tubing.

 

Please notis the firing order 1-3-4-2 and sircle in collector the same to create a exhaust swirl......

[vocky]

 compcam stg 4 exhaust/stg 3 inlet.

Are the stage 4 cams you mention the 113450 version ?

[speedster]

 

 

Forgot the hedder pic....

 

 

Nice! Where did you get the manifold, bends and the collector?

 

Pulse tuning..... NA tuning is so much more fun than boosting

 

 

Collector is 3.5" Chevy. The rest is hommade from 2" simmons exhaust tubing.

 

Please notis the firing order 1-3-4-2 and sircle in collector the same to create a exhaust swirl......

 

Interesting. I would (myself) logically have switch 3 and 4, to have a full circular motion.

[speedster]

yes it fits perfect. it was a project couple years ago in germany when some engineers and a former exhaust maker designed this. it's good for an extra 20hp and better torque in mid revs. maybe 5 were built but demand was low as supercharging become more popular with our cars and so more horsepower for the money.

Group buy?

[speedster]

I designed mine for maximum road power, so it's a 4-2-1 with loads of extra mid range torque

 

Should have about 200 ft lb of torque with my 2494cc engine, so 200 x 7500 / 5252 = 285, I wish   

 

One off or are you selling these vocky?

[speedster]

 

what does bdtc mean? my english seems not elaborate enough to understand. you are running itb right? regards from germany markus

 

BTDC is Bottom Top Dead Senter, but I use BDC as term in Norway. The exhaust cam open 90 degree before piston goes in it`s lower positione known as BDC. This is used for timing the reverse pulsing correct for creating vacuume that raise the VE at some point in the Rpm scale.

 

I use ITB from AT Power with homemade inlet manifold. AT Power relised a 30 mm DOHC inlet manifold for Z22SE last week.

 

Oakmere:

The cams go to 8500 Rpm :-)

And yes the head is fully prepped for 9000 rpm.

 

 

What are you using for engine management? (edit: because I forgot to type )

Edited by speedster, 23 September 2013 - 02:04 PM.

[vocky]

 

One off or are you selling these vocky ?

The looped exhaust took me roughly five weeks to make, well perhaps three weeks was wasted trying to make it fit

 

Fab has been pestering me ever since to make him one (and the answer is still no   )

 

So I will not be making any more, but feel free to get someone to make you a copy, the torque increase was something like 50ft lb's at 3000 rpm over a tullet system    

[speedster]

 

 

One off or are you selling these vocky ?

The looped exhaust took me roughly five weeks to make, well perhaps three weeks was wasted trying to make it fit

 

Fab has been pestering me ever since to make him one (and the answer is still no   )

 

So I will not be making any more, but feel free to get someone to make you a copy, the torque increase was something like 50ft lb's at 3000 rpm over a tullet system    

 

 

I think a custom made exhaust is the only real option, nothing off the shelf gives the same performance. Anybody making a exhaust manifold plate?

[vocky]

manifold flange ...

http://www.ebay.co.u...=item4d11e188ae

 

 

[BAre]

 

 

 

Forgot the hedder pic....

 

 

Nice! Where did you get the manifold, bends and the collector?

 

Pulse tuning..... NA tuning is so much more fun than boosting

 

 

Collector is 3.5" Chevy. The rest is hommade from 2" simmons exhaust tubing.

 

Please notis the firing order 1-3-4-2 and sircle in collector the same to create a exhaust swirl......

 

Interesting. I would (myself) logically have switch 3 and 4, to have a full circular motion.

 

 

 

Look once more. 1-3-4-2 going clockvise

 

The pulstuning can be used to move the torque peak up or Down Rpm scale.

 

My hedder is unequal length type with ideal length 32". One is 30", one is 32", one is 34" and the last 36 "...... making the torque some more flat on top and litle less top Hp.

[BAre]

 

 

what does bdtc mean? my english seems not elaborate enough to understand. you are running itb right? regards from germany markus

 

BTDC is Bottom Top Dead Senter, but I use BDC as term in Norway. The exhaust cam open 90 degree before piston goes in it`s lower positione known as BDC. This is used for timing the reverse pulsing correct for creating vacuume that raise the VE at some point in the Rpm scale.

 

I use ITB from AT Power with homemade inlet manifold. AT Power relised a 30 mm DOHC inlet manifold for Z22SE last week.

 

Oakmere:

The cams go to 8500 Rpm :-)

And yes the head is fully prepped for 9000 rpm.

 

 

What are you using for engine management? (edit: because I forgot to type )

 

 

 

I use Electromotive Tec GT with custom 60-2 triggersetup on a aluminium balancer.

 

Camshaft: I used the 264/268 degree setup, but intake made to little clerance so I fitted the 113351 intake (262 degree) to get 1,5 mm piston to valve clerance, and adjusting the intake 3 degree retard to make this happen.

 

Next setup will be with the 264 intake and 3-4 degree advance.

Edited by BAre, 24 September 2013 - 07:29 AM.