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Wallby

205 Rallye Power Run

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Wallby

Here is the graph from my recent rolling road tune with my new engine. It is Adam's (trogboy) old engine so many thanks to him for everything he's helped me with so far. Its a tu24/3 mix with the tu24 head, cam and 40 DCOMs and tu3 bottom end. The head has been skimmed to increase the compression ratio back up.

 

The headline figures are 101bhp @ 5270 rpm (at the fly) and 118lbft @ 3450 rpm. Im really happy with the engine as it goes quite well and sounds brilliant!

 

th_5a61a7f7.jpg

 

I willl get round to making a project thread for this car soon!

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Anthony

Im really happy with the engine as it goes quite well and sounds brilliant!

That's the important part right there :)

 

Accuracy looks a bit questionable though as 118lbft seems very high for a 1360cc 8v engine - that's 87lbft/litre! :blink:

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Wallby

Ye I have heard a few things about the reliability of the readings from this guy, but he has got it running very nicely

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allye

Thats great torque! Seems to produce peak power quite low, doesn't the TU3s produce 85hp at 6250 or something silly?

 

I envy you twin carb noise :wub:

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welshpug

I'd be inclined to check the cam timing :)

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RossD

Shape of that torque curve is very diesel like!

As long as you enjoy it, thats the main thing. Mine only produced 106lb/ft when mapped in 2009 (Hopefully a bit more now mind!) and that was a 1.6 with 45mm TB's etc. Peak torque on that was 4800rpm or so.

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stu_woac

carbs look to be leaning out at 5000rpm what jets and chokes you running also what cam did the guy just set up what you had on the car or did he change jets etc

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Wallby

He only had a play about with different jets and the ignition timing so looks like I need to look in to the cam timing. Is there anyway of checking if the cam timing is correct? Will the head being skimmed have any affect on this?

 

Ill have a look at what jets we finished with later as I can't remeber now.

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welshpug

skimmed head will retard the timing slightly, checking the timing is quite straightforward though I've not done it myself on a TU engine, ideally it'd need to go back for a checkup if you find the timing isnt to spec of the cam.

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trogboy

The engine is fitted with a vernier and I intially timed in the cam using a dial guage to correct for the retardation. As we used my original timing marks it should be pretty close to the stock TU24 cam position. The guy that set it up for me originally has tried swinging the cam and reported that he couldn't find any gains. Whether that is true of not I wouldn't like to say but I didn't go back there!

 

For info I came across an old graph from a power run at Circuit Motors down at Castle Combe who I used to get the tune checked on a couple of occasions. Nowhere near as much torque.

 

Ad

 

DynoRun17-11-07001.jpg

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welshpug

the wheel power figures look around the same 86 bhp.

 

how did tommy take the RPM reading from the car?

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Wallby

Thinking about it im not really sure how he took the rpm from the car. Would he have got it from the rollers themselves.

 

I do remember him entering into the computer at what revs 60mph was, has that got anything to do with it? He also had a plug on one of the leads, what would that be for?

I should have asked him more questions!

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trogboy

The plug on the lead will be giving the RPM as it picks up the induced current. RPM at 60 will work out the gearing...

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Wallby

I took the car out last night for the first time since the tune, nearly 2 weeks, and it really does go well! There is a little flat spot around 2500 rpm where it changes from the idle jets to the main jets but after that its great. Im suprised this flat spot doesn't really show on the graph though.

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RossD

Even though the axis are different on that 2nd graph something is still wrong with it. Even if you take into account the different axis, power and torque arent equal at 5250rpm which they should be.

 

 

Dyno plots eh - Its a minefield!

Edited by RossD

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Wallby

I also remember him saying the the hydro carbon emissions were quite high on idle, would this suggest anything about the cam timing?

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large

TBH Tommy's is not the best. Half of the print outs I have seen from him have just been a line /.

 

As Anthony has already said if you are happy with it that is all that counts.

If you would like to pop over the mountain to me I would be more than happy to take it flat out in the lanes for an hour and tell what I think.

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welshpug

If you would like to pop over the mountain to me I would be more than happy to take it flat out in the lanes for an hour and tell what I think.

 

ROFL

 

:lol:

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christopher

A standard rallye peaks at 68000 rpm:-) just for info

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trogboy


  1. A standard rallye peaks at 68000 rpm:-) just for info

:o !!!

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welshpug
:lol:

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Wallby

A standard rallye peaks at 68000 rpm:-) just for info

 

I'm affraid to rev mine too high as I don't trust the rev counter! It looked at least 500, maybe more out when it was on the dyno!

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welshpug

hasnt it got a rev limiter?

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Wallby

Don't think it has. Might be a good idea to get one though! What signal would a rev limiter run off then?

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trogboy

The orignial rev limiter in the TU24 was a sprung loaded counterweight contact on the rotor arm. Over speeding lead to it acting like a govenor and the cotor contact would retract preventing contact/spark until the engine speed dropped. I tried to get one but couldn't track one down so you have a solid rotor arm and effectively no limiter. WIth my clocks the rev counter used to underead massively - around 5.5k at 7k and when I had it on the dyno as I asked why they wern't taking it up to 6k?

 

You'd definitely notice the sound of the valves bouncing though if you over revved it.

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