Jaguar XJS V12 with Injection pb

Here is my v12 , 5.3 , bit of an injection pb so the performance is not wonderful , 105mph in 2nd gear (3Speed GM 400 ) I let the go off the accelerator in 3rd
Turn the Sound up

Category:

Autos & Vehicles

Tags:

• JAGUAR
• V12
• FAST
• SPEED
• NON
• TURBO
• SPORTS
• CAR

[idonlikeveg]

@3084me I know Jaguar changed the governor weights in the mid 80's. And for my box (1977) you can buy shift kits in order to increase the maximum rpm before a forced shift - because the stock shift was so low and doesn't allow you to reach maximum BHP which is at 5300.

i'm bored of this now! Think i'mma fix the brakes on mine and drive it up the road in 1 and see what happens! :D

the 3.6 has a 4 speed ZF box in it iirc, I don't know about the 4.0 I've never been in one!

[nuclhead]

damn thats a nice sound :D

[3084me]

Neat vid. Hey TAB685, I can also confirm that my 1990 XJ-S V-12 DOES NOT  force a shift at 5000 RPM. I've owned it since brand new and if it's kept in any gear other than D, It will continue to redline.

Idonlikeveg, I'm not sure about other years though. Maybe cars after the trans case change in the mid 90's or maybe with the 3.6liter & 4.0 liter cars?? My last XJ-S V-12 - 1987 (sold in 2007) - Can't remember exactly but - don't believe that car forced a shift either.

[idonlikeveg]

That's because the GM400 in the XJR-S has different shift characteristics.

Also, in the mid 80's, Jaguar recalibrated the GM400 for improved response. And during 1992 Jaguar changed the housing of the GM400. I assumed the XJS in this video had an early type because it's says in the description it's a 5.3.

Since my XJ-S has an early type GM400, it's shift point is 5000rpm.

[jaguarxjrs15]

My XJRS GM400 does not shift up at 5,000rpm, 5,000 rpm is a diesels red line. GM400 shifts up at 6,000. And even when held in 1st gear on the gear lever, it still shifts to 2nd when it redlines.

[jetlag700]

the Inline 6 cylinder has lots of power, it is only 1.1 Litres smaller than the V12, they are a bullet proof engine, I have one in my 87 XJ6. Just keep your eye out for white smoke coming out the exhaust and rough running, they like to blow a head gasket about every 100,000 miles, mine did and I have read the same from others who owned the XJ6. They really are lovely cars, I am keeping mine and restoring both my XJS which I drive everyday and the XJ6 which is in storage right now.

[TAB685]

@idonlikeveg

It's a V12 H.E 1991

It needs more than the speedo before it's perfect

I confirm that nothing force the shift, on my box anyway

[idonlikeveg]

Lol ok i'll give you that one (when the tachos work)

But my point was that the GM400 in an XJ-S forces a shift at 5000rpm no matter what the selector position.

Unless the governor has been modified.

I know that your tacho doesn't work now, but I thought I'd just mention that should you get a working one.

Is this an H.E or a flathead?

[TAB685]

@idonlikeveg

What your point ?

If you leave it in 1ST and accelerate till the pistons are hitting the valves it won't shift!

XJS tachos are accurate when they work, my doesn't..

What your point? What do you think I did ?

I said amercian V8 because this box was fitted to lots of american V8's duhhhh

[idonlikeveg]

Why would I say you faked how fast it goes? I have one(all be it not road legal at the moment), I know what an XJS is capable of.

And, if i said "FAKE" on every video, Why havent i said "FAKE" on this one?

Stop being so defensive, You can't say things like that based on assumptioms. example: I'm not American, Which you implied i was with "isn't an american V8"