Post your dyno curve here
Discussion
rockits said:
Yes, it is indeed loud and the pops/bangs are also quite ammunition like!
Edited by rockits on Thursday 24th September 13:35
I had mine mapped out of it other than at very low revs or at 1700 revs when I set throttle appropriately, I used to work late and get home midnight or Jam with some other Tvr nut case musicians
and get home even later lol so used to try creeping the last 3 miles. I have an ear drum issue so need mine Catted,, but it’s still got 300 hp and 345 torques Catted
so I’m well happy with it now. It’s quiet for such a beast. My pops and bangs are on tap so to speak so I can drive past respectfully when it suits me and not frighten small children
I never really looked and was wondering if I’m still using the Bosch relays as per the TVR RangeRover wiring loom so just checked, As part of the MBE wiring loom I have 3 new relays, one for fuel, one for starter circuit with a fuse attached and one to release ignition system. These like the Ecu are tucked up on the shelf behind the glove pouch so access is by simply pulling Ecu through that hole and you see the relays. Nothing but my fuse box and battery cables are visible in floorwell. It’s top class stuff.
Very few of these relays have ever failed I’m reliably informed. When you think about it most the Tvr relays have worked for decades now so not a surprise.
I might look up the numbers and get some spare ones but I’m told lit’s unlikely I’ll ever need them which is a nice reliability vibe. I’ll get some anyway
ETA, that chassis is a marvellous achievement
Edited by Classic Chim on Thursday 24th September 14:16
Edited by Classic Chim on Thursday 24th September 14:39
rockits said:
The pops and bangs are subtle in comparison to some I have heard as agree with you Alun they would be too much for me if silly. I think this Chimaera 500 I have has them spot on. You mainly notice a nice crack on upshift 1st to 2nd.
It just brings back great memories for me as it’s been that long since I experienced it. Things like that just become the norm but now seem an added bonus not many cars offer lol. I have to talk like this, I have a huge amount of work to get mine up and running so need to stay positive but there is a lot to miss about a good Tvr there’s no question.
davelittlewood said:
Here's mine from 2018.
Don't know how many horses have escaped since then mind you.
450 with
skimmed block, ACT carbon trumpets, smooth bore inlets, K&N filter, pre-cats out and an MBE system
Probably on 98 RON fuel
At the wheels. Don't know how many horses have escaped since then mind you.
450 with
skimmed block, ACT carbon trumpets, smooth bore inlets, K&N filter, pre-cats out and an MBE system
Probably on 98 RON fuel
314+20% for roadtrain losses = 376 ft torque at the fly
282+ 20% for road train losses = 338 Bhp. “. “. “
On an otherwise standard 450 engine with no head mods other than carbon trumpets that’s an impressive engine.
Edited by Classic Chim on Thursday 8th July 23:28
davelittlewood said:
Alun,
You can’t just add 20% to the torque figures for losses.
It has to be calculated based on all the gear ratios through the box and the diff.
You can transmit torque at zero rpm!
When calculating losses machines are using 20% as a base figure. That’s not correct but it’s the figure they are tending to use to give you at fly figures. Read up about it. It’s common place in the dyno tuning world. Your figures are at the back wheels as provided via Dom’s dyno so to get numbers inline with dyno that do that calc you need to add 20% Jacko numbers are not at the wheels they are at the fly as calculated by Joolz Dyno. Anything from 15-20% can and is applied. You can’t just add 20% to the torque figures for losses.
It has to be calculated based on all the gear ratios through the box and the diff.
You can transmit torque at zero rpm!
Another known tuner for aftermarket ecu for TVR gave both fly and at wheels figures for a RV8 engine. It worked out exactly as 20% losses.
The whole back to fly calculation is wrong but it’s how it’s done.
I have just used the same rule of thumb.
How do you calculate these losses and what at the fly figures do you come up with. I’m all ears on what is the correct calculation to use Dave.
Edited by Classic Chim on Friday 9th July 08:07
For shaft power a 20% transmission loss is not a bad guess but you can't do that with torque.
The torque at the crank could actually be lower than that at the wheels depending on the gear ratios.
https://x-engineer.org/automotive-engineering/chas...
The torque at the crank could actually be lower than that at the wheels depending on the gear ratios.
https://x-engineer.org/automotive-engineering/chas...
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