New camshafts for 4age -> 160hp

[harkes]

Hi

Could you please help me deciding on some cams for my 4age TVIS? The goal is 160hp with adjustable camgears, slightly higher compression and a new ECU. I have been looking at 288/304 with 8,5 lift from TODA Racing - any other suggestions?

The car is a daily driver...

- Thanks - Niels...

[Dogs Danglies]

BenR occasionally comes on here can have cams made, to suit your engine. Also on a thread on driftworks.co.uk theirs something about Toda cams being crap, I dont have an opinon on it myself, maybe Ben can explain the problem with Todas?

You could try emailing him

[Dogs Danglies]

his website is http://www.angel-works.co.uk

I will pm him see if he can out some input into this thread

[harkes]

Dogs:

Thanks

[BenR]

HOLA!!!

Happy holidays people.

Neils, i got your email but i hope this will answer your questions.

To hit 160bhp with the engine in near std trim, especially with the low static CR, you need to address a few key areas.

1) Induction. You will need to junk the TVIS, not becuse it is restrictive, but because it is ineffective and just gets in the way. Ideally you want to run throttle bodies or carbs, but if you must stay with the OE inlet manfold then you will want to modify it at least for better flow.

2) Cylinder head. These are very bad in std trim, and because of this, people tend to have to run more camshaft than is really needed to sustain high rpm VE efficiency to make decent HP numbers. Increase the efficiency of the cylinder head and you wont have to run asmuch camshaft as others, this retaining torque aswell. The bonus is that when the head is off aswell, you can use it to bump up the CR without having to modify or change the pistons, but then you will be limited to lift at TDC and will have to double check piston/valve clearance on the timing you WILL be running, you cannot swing the cams around wihtout checking clearance if you bring the cam bearing bores closer to the block deck face.

3) Camshaft. If your running std pistons and springs, then you are limited to lift. And the trend nowadays is to run asmuch lift as you can, not because the port flows more at high lifts (because a port will reach a lift point where it flows nore more even if you lift higher), but due to the nature of the cam lobe, it will spend proportionally more time at a higher lift value thus allowing more air to pass. For 160bhp you dont have to run too much duration, and you wont have to run too much seat poundage so std springs can be used. But for me to reccomend a profile, you MUST decide on the full engine specification first, otherwise it is pointless. The engine must be built as a system, working as one whole, not thousands of parts.

4) exhuast. The whole system is poor, and most aftermarket systems are poor. The good ones are expensive and you will require a 4-2-1 manifold, not point in 4-1 if your not going high on the rpm or bhp.

5) Mapping. YOu will have to address this via the most applicable means to yourself, but you HAVE to alter the fueling and ignition maps.

And why dont i like toda cams?

They tend to be overcammed, they like big numbers and end up with harsh and overly aggressive valve acceleration rates and valve motions.

[alimonos]

Ben i have a question and i would like to have your opinion...
I have a apir of Kamakazee cams in my bluetop Map 4age with T# adj cam gears. Is it better to switch to carbs setup (i have 2 X 40mm Webers available)or keep the Oem Inlet manifold(TVIS is thrown away and a Pacesetter 4-2-1 header is on...)
what is your opinion?
Thanks

[harkes]

So, to summarize:

1. Remove TVIS
2. Flow inlet manifold and head
3. Mill head for higher compression (? : ??)
4: Install camshafts with ??? timing and max 8,9mm lift
5: Install 4-2-1 exhaust
6: Re-mapped ECU

The limit for modifying my current engine is around 1000£. I can buy a used rally engine (ITB, Unichip, Exhaust, 302 - 8,9 cams) with 160hp for around 1500£...

- Niels

[Dogs Danglies]

If you want a new ECU I think you might struggle on that budget, if your also trying to buy cams and a exhaust too.

Maybe the rally engine would be better. Whats a Unichip, like one of those gay Superchip type companies?

[Darkstar]

I don't know what kind of stuff Superchips makes, but Unichip is a Dastek-made piggyback computer. Used to be popular among lightly tuned NA car owners, but it can be also used in turbo engines. http://www.dastek.co.za/

[BenR]

alimonos Wrote:Ben i have a question and i would like to have your opinion...
I have a apir of Kamakazee cams in my bluetop Map 4age with T# adj cam gears. Is it better to switch to carbs setup (i have 2 X 40mm Webers available)or keep the Oem Inlet manifold(TVIS is thrown away and a Pacesetter 4-2-1 header is on...)
what is your opinion?
Thanks

twin 40's are pretty small nowadays and you wont be making much more than 140-150bhp on them with the chokes at their largest size, then you will get low velocity problems as the signal strength is low.

I dont know the specs of the camshafts, but if you are able to decently remap or use a good piggy back system (NOT an SAFC etc) then it could be a nice drive. All our super production based 86's ran on the std type inlet manifold with about 160-170bhp back in the late 80's.