How much power/torque does a 4.2sc make?
Discussion
Figures you get from one dyno to another vary. There are so many variables, to start with, the factory numbers are for just the engine, you can't repeat those measurements in the car. So dynos approximate for losses and add them to the rear wheel figure (which should the interesting one anyway). Then the numbers are going to vary depending on the temperature and atmospheric, the higher the pressure the more oxygen you can get into the cylinders so the more fuel you can burn...etc. For an SC car then the air temperature is going to affect how much compression you can do before the air gets too hot...
Having just got an S Type R myself I was interested in this also.
Youtube brings up a few dyno runs.
Outputs varry masively from 315-350 hp at the wheels on stock cars, I think its harder for the dyno operators to calculate the losses on an auto box cars. Here is an example
http://www.youtube.com/watch?v=tEf-POsE38c
I worked at a jaguar dealer when they were new and have driven lots of supercharged Jags, my one is 8 years old with 100k miles on it and feels as fast as they did new. I'd guess I'm well within 5% of what it had from new. Might get it dynoed next year, but worried out stressing the gearbox as highish miles.
Youtube brings up a few dyno runs.
Outputs varry masively from 315-350 hp at the wheels on stock cars, I think its harder for the dyno operators to calculate the losses on an auto box cars. Here is an example
http://www.youtube.com/watch?v=tEf-POsE38c
I worked at a jaguar dealer when they were new and have driven lots of supercharged Jags, my one is 8 years old with 100k miles on it and feels as fast as they did new. I'd guess I'm well within 5% of what it had from new. Might get it dynoed next year, but worried out stressing the gearbox as highish miles.
Interesting about the losses being hard and i can see why.
As regards stressing the gearbox I don't know how you drive but I definitely didn't buy a 400bhp car so that I could drive it as if it's a 200bhp car, if you get my drift. Assuming you bought for the same reason I very much doubt a little squirt to the redline a couple of times on the dyno could stress the gearbox any more than normal driving, and given the lack of lumps and bumps I'd suggest very much less.
Also my understanding is that atmospheric conditions are measured and allow a dyno to compensate for the air density for obvious reasons. Although granted one dyno is likely to be calibrated differently to another.
SM
As regards stressing the gearbox I don't know how you drive but I definitely didn't buy a 400bhp car so that I could drive it as if it's a 200bhp car, if you get my drift. Assuming you bought for the same reason I very much doubt a little squirt to the redline a couple of times on the dyno could stress the gearbox any more than normal driving, and given the lack of lumps and bumps I'd suggest very much less.
Also my understanding is that atmospheric conditions are measured and allow a dyno to compensate for the air density for obvious reasons. Although granted one dyno is likely to be calibrated differently to another.
SM
what an interesting read, thanks.
I've used rolling roads for my bikes and cars for many years now mainly just to check fuelling is ok and power in the right ballpark. My M5 for example didn't seem super happy when I bought it so I had it tested and got aborted due to lean mixture. The guy (atthowe norwich) went the extra mile and diagnosed MAFs and even gave the findings to BMW who grudgingly changed them for me, transforming the fast car into an epic fast car. GT2 came up good out of the box as it were nothing to do (although he had to use many straps because the beast kept trying to climb out lol) My Jag will be tested as soon as a couple of little teething issues are sorted by the dealer then tested again in a few months after some super unleaded, proper engine oil and sustained "italian tuneup" action to see if it's as it should be and to measure the effect of my actions.
I totally get that the absolute figures are a bit hit and miss, but relative figures and AFR lines are super good at making sure you haven't paid for 400bhp and bought 320. Seems as important as the HPI check to me.
SM
I've used rolling roads for my bikes and cars for many years now mainly just to check fuelling is ok and power in the right ballpark. My M5 for example didn't seem super happy when I bought it so I had it tested and got aborted due to lean mixture. The guy (atthowe norwich) went the extra mile and diagnosed MAFs and even gave the findings to BMW who grudgingly changed them for me, transforming the fast car into an epic fast car. GT2 came up good out of the box as it were nothing to do (although he had to use many straps because the beast kept trying to climb out lol) My Jag will be tested as soon as a couple of little teething issues are sorted by the dealer then tested again in a few months after some super unleaded, proper engine oil and sustained "italian tuneup" action to see if it's as it should be and to measure the effect of my actions.
I totally get that the absolute figures are a bit hit and miss, but relative figures and AFR lines are super good at making sure you haven't paid for 400bhp and bought 320. Seems as important as the HPI check to me.
SM
supermono said:
My Jag will be tested as soon as a couple of little teething issues are sorted by the dealer then tested again in a few months after some super unleaded, proper engine oil and sustained "italian tuneup" action to see if it's as it should be and to measure the effect of my actions.
I found absolutely no benefit with Super Unleaded in my S-Type BTW.It'll defeat the traction control on a dry road, so it sure as hell isn't lacking power
Wouldn't recommend doing that too often though .........
Hi SimonG,
nice fleet. I'm a ex-TVR and hopefully soon a Jag man too.
Current dilemma I'm wrestling with for next year is whether to get an XFR (not sure new or used) on its own or get a nice Chimaera (do miss my TVRs) for sunny days plus an older (2004-2006) XJR for winter, longer journeys etc.
Do you find the Chim and S-type complement each other and both get used sufficiently?
Cheers.
(sorry I keep hijacking threads but noticed you have virtually what I'm thinking of)
nice fleet. I'm a ex-TVR and hopefully soon a Jag man too.
Current dilemma I'm wrestling with for next year is whether to get an XFR (not sure new or used) on its own or get a nice Chimaera (do miss my TVRs) for sunny days plus an older (2004-2006) XJR for winter, longer journeys etc.
Do you find the Chim and S-type complement each other and both get used sufficiently?
Cheers.
(sorry I keep hijacking threads but noticed you have virtually what I'm thinking of)
Northbloke said:
Do you find the Chim and S-type complement each other and both get used sufficiently?
I don't do that many miles in either to be honest, but I wouldn't want to be without either!My Chimaera is supercharged as well
If you only want one car, have you considered an XKR convertible?
Depends if you need the full 4 seats at all I guess.
Hi Simon,
I was previously on the verge of getting a used new shape XKR but just decided to scratch the Tuscan itch first instead. I would absolutely love to have one. Mind you I say that about most Jags, what a great range of cars they've been making recently, it makes it hard to choose.
Things have moved on though and yes I do need the extra seats now.
I love the look (and colour) of supermono's XJR, prefer it to the new shape to be honest. Very classy and with 400bhp, wow (I like to use the bhp too!). I've been limiting myself to looking at pre 2006 ones though as the ludicrous CO2 tax kicked in then I think and I'm trying to get VFM. Paying nearly £500/year because of the Green Taliban when I do lowish mileage just grates.
I was previously on the verge of getting a used new shape XKR but just decided to scratch the Tuscan itch first instead. I would absolutely love to have one. Mind you I say that about most Jags, what a great range of cars they've been making recently, it makes it hard to choose.
Things have moved on though and yes I do need the extra seats now.
I love the look (and colour) of supermono's XJR, prefer it to the new shape to be honest. Very classy and with 400bhp, wow (I like to use the bhp too!). I've been limiting myself to looking at pre 2006 ones though as the ludicrous CO2 tax kicked in then I think and I'm trying to get VFM. Paying nearly £500/year because of the Green Taliban when I do lowish mileage just grates.
Northbloke said:
Hi SimonG,
nice fleet. I'm a ex-TVR and hopefully soon a Jag man too.
Current dilemma I'm wrestling with for next year is whether to get an XFR (not sure new or used) on its own or get a nice Chimaera (do miss my TVRs) for sunny days plus an older (2004-2006) XJR for winter, longer journeys etc.
Do you find the Chim and S-type complement each other and both get used sufficiently?
Cheers.
(sorry I keep hijacking threads but noticed you have virtually what I'm thinking of)
There is a problem here...I have a Chim 450 and a 2007 XJR. This means that driving the chim while still fun is not quite the hair raising prospect it used to be as the Jag is just as quick. nice fleet. I'm a ex-TVR and hopefully soon a Jag man too.
Current dilemma I'm wrestling with for next year is whether to get an XFR (not sure new or used) on its own or get a nice Chimaera (do miss my TVRs) for sunny days plus an older (2004-2006) XJR for winter, longer journeys etc.
Do you find the Chim and S-type complement each other and both get used sufficiently?
Cheers.
(sorry I keep hijacking threads but noticed you have virtually what I'm thinking of)
So now I'm looking at having the Chim supercharged but then the Jag will appear a bit sluggish so maybe just upgrade the pulley on teh Jag SC. Oh but now its as fast as the chim..
See where this is heading ? I think its going to ruin me
ETA: I take my sons 1.4 8v Daewoo Lanos to work once a week just to be able to enjoy the difference when I get back in the Jag.
ETA2: While I have not driven the XFR I have had the use of most of the other XF models and it put me right off buying one, they just dont feel like a Jag to me. Same goes for the new model XJ, really didnt like the one I had for a while. The computer/touchscreen in the new Jags is also woeful, the one in my 07 XJR is much better, and the later style steering wheel controls are not to my taste either. That alone would put me off buying any new Jag.
Edited by Dodsy on Friday 29th November 14:54
Well there was me thinking I was being original when it's obviously a well worn path! I'm jealous.
I suppose it's a natural progression to match the lairyness of a TVR with the more sophisticated Jags as you get older. Both great to drive with fantastic stylish interiors.
I think I could handle both cars having loads of power to be honest
.
It would just be a straight choice: nice weather = roof down Chimaera; poor weather or family to transport = Jag.
I suppose it's a natural progression to match the lairyness of a TVR with the more sophisticated Jags as you get older. Both great to drive with fantastic stylish interiors.
I think I could handle both cars having loads of power to be honest
. It would just be a straight choice: nice weather = roof down Chimaera; poor weather or family to transport = Jag.
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