4age questions

[AM TUNING]

hi all

couple off questions for u ,

what rpm is best in a standard 4age for the tvis plates to open

whats the max safe rpm is a standard 4age

when i say standard i mean stadard internals with a air filter zaust and a motec m4 ,

motecs over kill but i was sitting in the draw and i wanted some fun for nurburgring in 2 weeks


cheers all andi

[HT]

hi all

couple off questions for u ,

what rpm is best in a standard 4age for the tvis plates to open

whats the max safe rpm is a standard 4age

when i say standard i mean stadard internals with a air filter zaust and a motec m4 ,

motecs over kill but i was sitting in the draw and i wanted some fun for nurburgring in 2 weeks


cheers all andi

If I'm not mistaken:

Mk1a's open around 4,400 RPM
Mk1b's a bit later at nearly 4,800 RPM

HTH

[Lauren]

Standard is the best time for it to open. Earlier cars have a more aggressive ECU and mapping right through to the redline, whereas the later engines have an ecu that opens the TVIS a bit earlier, though the fuelling map dissapears past about 5600rpm IIRC.

Its the other way round in terms of TVIS opening:

4650rpm for Mk1a
4350rpm for Mk1b

You can rev it on the limiter all day, it will take it no problem (7599rpm)

Reckon you'd be okay to 7800 rpm, no problem and possibly even 8K, but not sure it'd be worthwhile with the stock cams though.

[crazylegs]

you have it the wrong way round the mk1 a is def earlier in the rev range.

[Lauren]

you have it the wrong way round the mk1 a is def earlier in the rev range.

Yes you are absolutely right. Now i've had time to think about it.

[AM TUNING]

thats great ,

tvis set to 4500 rpm opening

and limiter set to 7800 with a 200 rpm control range ,

let see how tomorrows mapping with dave goes ,

cheers all

andi

[midenginedmaniac]

I take min up just below 8K on a regular basis.

[Lauren]

I take min up just below 8K on a regular basis.

Are you on a stock ECU?

[midenginedmaniac]

I have no Idea. I have never changed it and it looks original.
Have a lookie if you like. I took this vid when no one believed it would do over 90 in third. I hit 90 at 7.5K. I take it to just under 8K in second on the initial take off.
Its poor quality as my phone was taped to my wheel.

http://s143.photobucket.com/albums/r122 ... V00012.flv

[Lauren]

I have no Idea. I have never changed it and it looks original.
Have a lookie if you like. I took this vid when no one believed it would do over 90 in third. I hit 90 at 7.5K. I take it to just under 8K in second on the initial take off.
Its poor quality as my phone was taped to my wheel.

http://s143.photobucket.com/albums/r122 ... V00012.flv

You can beat the limiter a bit in second gear, its just inertia of course. But the limiter does cut in at 7599rpm.

I still don't believe it does 90 in third btw, speedos over-read by at least 4mph at that speed.

[SW20Paul]

wouldnt bigger than the standard wheel's throw out the speedo as well ?

[luthor1]

At 7590rpm with 1.31 3rd gear ratio, 4.31 final drive, on 195x50/15 tyres it's doing 92mph.

[midenginedmaniac]

Well you saw the video it doesn't lie. I hit just under 8K without limiting. The car hits over 95 on the speedo in third before it limits. Checked against my GPS and its not far out at 90 crusing. My car may have been tuned in its previous life. I have no history so who knows. I have never been over 115 so no Idea of the top end. 125 at a guess.

Anyway its not really important as I love my mk1 and It makes me smile everytime i thrash it to death.

[un1eash]

Has anyone actually experimented with changing the TVIS open rpm. I always think it could do with opening abit earlier, would be interesting what the maximum power you could get by just remapping the engine.

[JMR_AW11]

Has anyone actually experimented with changing the TVIS open rpm. I always think it could do with opening abit earlier, would be interesting what the maximum power you could get by just remapping the engine.

I've played with it and I don't think there's any power to be gained from altering TVIS.

But it does sound better at 4350rpm as per the mk1a.

The ECU also adds a sudden step in the ignition advance when it switches the TVIS in (it actually waits for a small delay for the plates to open before adding the advance)

I think they add the (3 degrees IIRC !!) advance to add to the kick of the TVIS. It probably helped with the TVIS marketing when the cars were released to the press for roadtesting!