wheres the red line?
Discussion
I think any higher than 6200 isn't too good really.
After my Chimaera (4.0) was chipped it's peak power moved from 5500 to 6100. I think the rev limiter kicks in about 6200. I normally don't go over 6000!
The previous owner had a before and after dyno printout.....
The diagonal lines are the Bhp the arc curved line is the torque. The dotted line is after the chip and the solid line is before.
>> Edited by dannyboyo on Thursday 12th June 01:02
After my Chimaera (4.0) was chipped it's peak power moved from 5500 to 6100. I think the rev limiter kicks in about 6200. I normally don't go over 6000!
The previous owner had a before and after dyno printout.....
The diagonal lines are the Bhp the arc curved line is the torque. The dotted line is after the chip and the solid line is before.
>> Edited by dannyboyo on Thursday 12th June 01:02
Mines (4.0 HC) in for the full works with Mark on the 24th June, can't wait (except for the wallet bit).
happy to put results up if anyone is interested, I'm really looking to get better manners from the car at low revs + to iron out the ecu/plenum issue that causes judder at 2800-2900 revs in 2nd / 3rd, obviously any additional bhp / torque will be nice.
Did you advise your insurnace comapnies about the work & if so, what was their reaction.
happy to put results up if anyone is interested, I'm really looking to get better manners from the car at low revs + to iron out the ecu/plenum issue that causes judder at 2800-2900 revs in 2nd / 3rd, obviously any additional bhp / torque will be nice.
Did you advise your insurnace comapnies about the work & if so, what was their reaction.
Yes, tell the insurers. Shouldn't make any difference if you sell it right - as optimizing the current setup and not tuning for more power.
My std 4.0L power curves post tune up were virtually identical to Dannyboyos - 241hp and 245lb ft in my case. Please do post your results - be interesting to see how a HC fares. (BTW, Dannys/my figures are exceptional for a std 4.0L.)
T/.
My std 4.0L power curves post tune up were virtually identical to Dannyboyos - 241hp and 245lb ft in my case. Please do post your results - be interesting to see how a HC fares. (BTW, Dannys/my figures are exceptional for a std 4.0L.)
T/.
hut49 said: So what these power plots tell me is that the incremental power to be gained beyond 5000rpm is pretty insignificant - so why stress the bo££ocks off a £2k lump for the sake of a few extra revs?
Not exactly, changing up at lower revs give you lower revs in the upper gear, you want to be as far up the curve as you can after the change up 
Is there any point, that's still up to you
aaandy said: I believe that the book states that the 4.0l peaks at 5600rpm and red lines at 6250rpm which is where the rev limiter kicks in.
But as Plotloss says an after looking at those power graphs above, anything over 5000rpm isn't doing much good. Just noise an wear.
There might not be much improvement in power over 5000, but its where you are when you change up that counts. You change up at 6000 and your not far off your peak power band. Change up and 5000 and you've got to build the revs up again before you get the power.
JamieBeeston said:
dannyboyo said: Oooooh!! That puts my lil 4.0l to shame!!! Whats that? About 265??
>> Edited by dannyboyo on Thursday 12th June 01:26
263bhp / 283 lb/ft courtesy of Tim Lamont and Mark Adams (and my wallet :P)
Jamie, did you get the Tornado chip before doing the other bits (trumpets, plenum etc..) and if so is that dyno reading before or after adding set bits? I am thinking of getting a Mark Adams session and chip for my 450 and wondered what difference it would make to acceleration etc... without other bits (planning Tuscan purchase next year so don't want to spend too much). BTW why you selling? purchasing something else????
As has been pointed out: so you don't have to make those clutchless upshifts to avoid dropping too many revs and hence out of the peak power band.
hut49 said: So what these power plots tell me is that the incremental power to be gained beyond 5000rpm is pretty insignificant - so why stress the bo££ocks off a £2k lump for the sake of a few extra revs?
chim450 said:
Jamie, did you get the Tornado chip before doing the other bits (trumpets, plenum etc..) and if so is that dyno reading before or after adding set bits? I am thinking of getting a Mark Adams session and chip for my 450 and wondered what difference it would make to acceleration etc... without other bits (planning Tuscan purchase next year so don't want to spend too much). BTW why you selling? purchasing something else????
www.pistonheads.com/gassing/topic.asp?f=8&h=&t=23948
full story there, I have dyno before chip, after chip, chip and pre cats, chip and trumpets.
Selling as I have a hankering for a GT3, and just came into a chunk of cash...
doh just checked, and I didnt post a graph for pre/post chip, just numbers, will see if i can dig em out
www.pistonheads.com/gassing/topic.asp?t=20340&f=8&h=0&hw=JamieBeeston
was the thread after i got her chipped
>> Edited by JamieBeeston on Thursday 12th June 20:13
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