Power run today on 4.0
Discussion
I had a power run done on a new rolling road in Witham, Essex today on my 1997 4.0. It gave 211bhp@5564rpm at the flywheel and 216 lb/ft torque@4300rpm with a really nice, flat curve with 165lb/ft@2000rpm and 200lb/ft@5564rpm. What have other people had on their cars?
Mine is standard with the timing adjusted for 95 unleaded so I'm happy with the results but may go for a Unichip if I decide to keep it. It was hitting the limiter at 5564rpm though when power was still climbing, has anybody else got a limiter so low?
Paul
Mine is standard with the timing adjusted for 95 unleaded so I'm happy with the results but may go for a Unichip if I decide to keep it. It was hitting the limiter at 5564rpm though when power was still climbing, has anybody else got a limiter so low?
Paul
curryaddict said:
limiter at 5100rpm....beat that !!!
Shirley not, heard of the 5K6 limiters but not that low before
, believe the 6K25 to be a better point myself. Not sure if this can be tweeked/changed on a standard chip though, anyone . 210-215 are very respectable figures for standard 4ltrs IMHO, more imporantly though what wheel figures did you have before the correction to flywheel
Harry
Yep mines a 5100 limiter too. Nothing too unusual about that one I am afraid. In general some early 4.0 engines came out the factory with 5250 limiters on, but when you factor in actually trying to assess precisely what the revs are - 5100 is about right....
Going to get a Mark Adams chip to get that raised - simple and easy to do and they can safely rev to 6000 without any problems....
Going to get a Mark Adams chip to get that raised - simple and easy to do and they can safely rev to 6000 without any problems....
zzr do you have a print out of the power run, if so post it here, you can normally tell a bit more from its shape. IMHO the torque may be a little low, powers seems fine though. Saying that, there are always 'funny' figures, try not to read too much into them, particulary if you are happy with the way it drives. Compared to a 1200 Kwaka it probably feels a tad slow anyway 
.
Harry
, if so post it here, you can normally tell a bit more from its shape. IMHO the torque may be a little low, powers seems fine though. Saying that, there are always 'funny' figures, try not to read too much into them, particulary if you are happy with the way it drives. Compared to a 1200 Kwaka it probably feels a tad slow anyway . Harry
pbrettle said:
Yep mines a 5100 limiter too. Nothing too unusual about that one I am afraid. In general some early 4.0 engines came out the factory with 5250 limiters on.
That doesn't sound very likely, it would have had to be done deliberately and I can't see any reason to set it that low. The lowest rev limit I've come across is the 5k6 limit on the early 4.0 catted engines. Isn't it more likely that some engines have a fault causing a high rpm misfire, or some tachos simply under-read?
HarryW said:
zzr do you have a print out of the power run
Harry
Hi Harry,
I have a printout of the power run, I'll scan it later and post it on this thread. The BHP read out was starting to flatten when the limiter came in so I assume it will probably give about another 10 flywheel horsepower before tailing off. I thought the torque seemed a little low as well because the curve is not that curvy (if ya know what I mean!). I am currently deciding on whether to keep it, I had decided to put it up for sale but the other half is persuading me otherwise! If I keep it I'll probably chip it to improve drivability, if I gain extra power then so be it.
Your right about the bike though, makes any TVR seem slow, I want to run the bike up the strip as I've seen qtr mile times of 10.5 secs @133mph!
I should just be getting to the end of 3rd gear about then!
Mark.S said:
Wheres this place in Witham Paul?
Hi Mark,
How's the 500 going?
The rolling road is on the industrial estate by Dovercourt Ford on the North side of Witham. Just turn left (if travelling from the town centre) before the ford dealer and go to the end of the road and the car park is right in front of you, the 2 guys who run it have worked with various professional race teams and seem to know there stuff. I'll give you the phone number when I get home.
Paul
Just found this thread, sorry I'm late. I had my bog standard 4.0 LTR tested at Power Engineering in the Summer because I thought it felt a bit lacking in power. I got a max power of 220BHP at 5440RPM with a peak torque of 237lbs/ft - Mark Adams was there at the time and said it was a "very strong car"!!
Isn't it funny how a print out and a few words can make you feel so much better - the car feels just as it ever did but I'm now convinced she's a rocket!!
Isn't it funny how a print out and a few words can make you feel so much better - the car feels just as it ever did but I'm now convinced she's a rocket!!
Flywheel figures are so misleading.
The only true figues that should be compared IMHO are RWHP figures.
We can all say 'I've got 250 at the fly' but what we don't know is the loss in the drive train, what is it on the Chim, 12-15%? Far more 'honest' to state the figures AT the rollers.
Tim
The only true figues that should be compared IMHO are RWHP figures.
We can all say 'I've got 250 at the fly' but what we don't know is the loss in the drive train, what is it on the Chim, 12-15%? Far more 'honest' to state the figures AT the rollers.
Tim
arandle said:
...probably showing my naivety here but given the figures we're talking about came from a rolling road session surely these BHP figures are at the wheels (not the flywheel)???....
unfortunately not, many rolling roads "adjust" the figures to flywheel horse power
regarding whats been stated above, whats the v8d and mark adams mods consist off outta interest?
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