Here, current state of my project.
Drive train is done, under body all welded and coated, both axles are fully rebuilt, now tweaking some motor plumbing and off we go to body shop for paint.
Here she rumbles:
Old V12 @ 500 rpm - YouTube
Here she spins @ about half throttle:
1982 Jaguar XJS, Spring Burn Off, Part 2 - YouTube

 

why is the idle set so low??

i don't really understand your question "is this throttle response good"

generally thats looked at as is the acceleration good and does it begin accelerating at soon as you press the pedal down. All you did was rev it under no load which doesn't tell you much. Its just normal more or less, not good or bad. When you rev the engine is should do something lol.

also just asking....wtf is with the randomly painted blue parts.

 

also i understand its a project and your cameras mic can't capture what the car really sounds like but i hope you are putting something on the exhaust to refine it

 

Blue parts are what I implanted from southern donor. Half the car got cut out and replaced. Door are also different color (for now), from 1990 donor.

 

Pipes are off, so sound will be refined with new Walker exhaust I got sitting and waiting.

 

Sarcasm - YouTube

 

Well, it took me forever to adjust the damn TPS and get perfect vacuum. Now it seems tons better, however I never compared it to other V12's.
One thing for sure, 400 Turbo is killing half of the power, so manual is a MUST!

 

that thing revs so easy compared to factory V12's. there no comparison. that 40lbs of rotating torque converter cant help. and i swear if you put catalytic converters back on this car when its finished i will karate chop you in the throat.

 

"Is this throttle response good?"


Sounds/seems normal to me; sounds/seems as good as any other V12s I've worked on.

Not sure if I understand the question either. If you're expecting it to instantly zing up to 4-5000 rpm like a race motor, it won't. :-)

Cheers
DD

 

Is this a "non factory" V12? Sounds about the same as any other to my ears. Am I missing something?






Right!





Why?

Unless they're clogged up the cat converters won't make much difference.

Cheers
DD

 

well if you take the cats off and do nothing else.... then yeah, it wont help a whole lot. removing the cats will allow you to run a LOT more timing. not to mention Cats totally muck up the sound.

his mod list is pretty nice.

 

I assumed he wasn't being sarcastic because that would mean he was trolling people into coming into his thread to show off his project, when he could just make a thread titled "project progress" or something and not look like a douche.

So i assumed it was a real question...which it was

 

Also yeah the auto kills the power in these cars. Its only got 3 gears and because of that if it were setup to go fast the mpg would SUCCCCK but if you convert it to a 5 or 6 speed it gets way faster and the mpg goes up too.

the TKO 5 speeds are fastest but if you custom made a 6 speed to have gears like the 5 speed and make a steep 6th gear for cruising you could have the best of both

 

It does? How so?

Cheers
DD

 

also as far as the tps and vacuum now i know what you mean, well i can't try to listen and compare because my car is taken apart right now but it sounds right.

As i said before i think the idle is low and should be more like 750 or something but i cannot remember.

 

I keep it comfortably at 500 rpm, it powers steering well, does not die and produces about 20psi of oil pressure, so no reason to go higher, unless I want more under hood temperature and fuel consumption at traffic lights.

 

the cat restricts the flow of exhaust. removing them allows more air/fuel into the combustion chamber at WOT. if youve got a more suitable mixture, with less exhaust gasses being trapped in the combustion chamber, and therefore less heat, you can advance your ignition timing.

i dropped 7/10ths off of my 1/4 when i removed the cat and upped the timing on my track car... and it only had 1.


you need to post your full mod list sometime.

 

Right now my electric fans are off completely, so car is idling with no forced air flow and it can sit for 30 minutes at perfect temperature, right under the middle of gauge. If I up the idle to 650, it will need cooling fan to be on.

My mods were all cheap type, mostly related to plucking over engineered junk from under the hood:
1. air injection is gone, ports are tapped with 6mm thread and plugged with bolts. Air pump is gutted and serves as pulley for A/C.
2. Evap system is gone, charcoal can was full of earth worms anyways.
3. Idle control valve is rebuilt with Volvo thermostat bulb.
4. Fans are electric, with the use of BMW 5 series 2 speed fan, now I am working on mating 2002 XKR fans in place of original metal shroud, still have 1/4" to slim them up.
5. Self made injection harness (very easy job), all refurb. injectors from some shop in Cali (about $40 each).
6. Bosch fuel pump from F150 pickup, same size, but little bit more pressure, I got bunch of them in my stash.
7. All fuel lines are redone with nice American hoses. There is one hose section in XJS that rots out nasty.
8. Plugs are jap. NGK, wires Bosch, all vacuum lines are redone in a simpler manner, with no funky elbows and metal to rubber intermediate joints.
9. Cat. converters are gone, all 4 are gutted, yet left in place for the show. Exhaust is new, by Walker of UK.

 

sounds good, close to a normal V12 , without any exhaust.

response is the time in seconds an engine takes to go from idle to the limiter, in neutral, very diffeciult to measure!