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Engine, Exhaust & Gearbox ECU chips, decats, cam kits,

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Old 05-06-2017, 10:42 AM   #1
Ricardude
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Hotting up a TU3s engine

Hi all, I'm looking to extract some more horsepower from my TU3s. Thinking of skimming the head, uprating the camshaft, possibly changing the pistons, rejetting the carb (twin choke Solex) and getting a new exhaust manifold.
I'd really like some advice - what's the best fastroad cam to use? Is it worth changing the pistons (given the cost)? Can a single cam be as good if properly set up as twins?

Another option I'm considering is using a 106 gti/xsi head on the existing block. How big a job is that? Could i still run it on a carb?

Don't want to do an engine swap as I'd like to keep the original and not replace suspension and brakes.

All opinions welcome..
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Old 05-06-2017, 11:27 AM   #2
welshpug
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I'd leave the engine well alone and concentrate on chassis first.
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Old 22-06-2017, 03:37 AM   #3
Ricardude
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Quote:
Originally Posted by welshpug View Post
I'd leave the engine well alone and concentrate on chassis first.
How come leave the engine alone and what would you recommend doing to the chassis?
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Old 22-06-2017, 10:14 AM   #4
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because its a much more effective way of going faster.

power is nothing without control as they say.
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Old 22-06-2017, 01:56 PM   #5
PUG406
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Easier and cheaper to weight reduct than to gain HP
But if you get an EFI head, it will mean you will need to spend a bit of money and time to make it carby again. You could just stick with the normal EFI system and still have gains with an XSi head. Then you could put a rallye intake manifold and some good headers, exhaust, etc.
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Old 22-06-2017, 02:13 PM   #6
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it sounds like the OP has a 205 not a 106 as he talks about his TU3s, aluminium block carbed 85 bhp engine. which the 106 didn't get.
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Old 22-06-2017, 11:28 PM   #7
Ricardude
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Quote:
Originally Posted by welshpug View Post
it sounds like the OP has a 205 not a 106 as he talks about his TU3s, aluminium block carbed 85 bhp engine. which the 106 didn't get.
Yep. A '91 GT.

Quote:
Originally Posted by welshpug View Post
because its a much more effective way of going faster.

power is nothing without control as they say.
True but as I'm pulling the engine apart anyway to replace worn bits and clean off years of gunk, i thought i may as well enhance it a bit.

Last edited by Ricardude; 22-06-2017 at 11:28 PM. Reason: Automerged Doublepost
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Old 18-07-2017, 12:01 PM   #8
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The best thing would be to find an ax 1.3 sport head or 205 1.3 rallye head. These two heads have the larger valves in them (39mm intake), much like the 106 Rallye and XSi. The intake pattern is totally different then what you have now, so you will have to find an intake manifold to suit. These two engines used 2x twin webber/solex carbs 40mm, in combination with more aggressive cam and domed pistons they produced 95/103Hp (Ax sport 95hp, 205 Rallye 103hp).

On the other hand, you could just fit a more aggressive cam to your head, something like catcams 4901102. This cam is designed for TU24 engine (AX sport/205 rallye), but as they share the same bearing sizes it will fit and has the necessary lobe for mecanical fuel pump and recess at the end of cam for distributor. You will have to change the valve springs and retainers as the stock ones won't work.

You will have to do something to raise the compression as stock is too low for this cam in my opinion.

Rejeting the carb will also have to be done to bring the A/F ratio to safe levels again, as this cam will lean out the mixture.

Find a 4-2-1 manifold and you are done. You will have a nice fast little car
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