Target 300bhp: how difficult is it?
Discussion
So, what level of modification do you need to get a genuine 300bhp out of a Chimaera 500?
As I understand it, that's about 20bhp up on a healthy factory engine in the real world.
I started a separate topic as I'm quite curious to hear what power outputs people have measured from given mods in general, but the spec that I had in mind was: V8 Developments uprated short engine and fast road cam allied to an otherwise standard 5-litre setup (normal heads, plenum, ECU) with the present decatted exhaust. Obviously the cam change is going to be the major performance change there.
As I understand it, that's about 20bhp up on a healthy factory engine in the real world.
I started a separate topic as I'm quite curious to hear what power outputs people have measured from given mods in general, but the spec that I had in mind was: V8 Developments uprated short engine and fast road cam allied to an otherwise standard 5-litre setup (normal heads, plenum, ECU) with the present decatted exhaust. Obviously the cam change is going to be the major performance change there.
My 5l,its now alot quicker than the graph..V8Developments 5l,stealth cam,ported heads,72mm plenum,45mm trumpet base with short flared aluminum trumpets,ported inlet manifold,TVR Power insulator gasket,standard cleaned and flow tested injectors.ACT full induction pipes and insulated with K&N air filter ,megasquirt and tuned by Rob at V8D..
Edited by SILICONE KID on Thursday 14th April 11:11
V8 GRF said:
.... oh and a fresh cam 
Standard profile?I don't know (yet) the state of wear on my current cam, but I've always found the 500 to be a bit short on top end. I'm told the heads are quite good as standard, but the cams aren't aggressive enough to make use of them. A fast road cam is a apparently a very cost effective upgrade.
.
At Roar 08, most if not all 500's struggled to achieve 275 bhp, that little extra requires a not insignificant amount of work.
The only answer is to take it apart and check it out
biper said:
304.1 bhp standard no mods
With respect, that would be highly unlikely to be standard, a previous owner may have had work done.At Roar 08, most if not all 500's struggled to achieve 275 bhp, that little extra requires a not insignificant amount of work.
The only answer is to take it apart and check it out
Chris,
Take a look at some of the RR results from the Griff Growl / Chimaera Roar events.
300+bhp, at the fly, doesn't figure too often and is very rare for totally unmodified engines.
http://www.pistonheads.com/gassing/topic.asp?h=0&a... 2010 Rolling Road results.
http://www.pistonheads.com/gassing/topic.asp?h=0&a... Rolling Road Results
Take a look at some of the RR results from the Griff Growl / Chimaera Roar events.
300+bhp, at the fly, doesn't figure too often and is very rare for totally unmodified engines.
http://www.pistonheads.com/gassing/topic.asp?h=0&a... 2010 Rolling Road results.
http://www.pistonheads.com/gassing/topic.asp?h=0&a... Rolling Road Results
OP - you may find yourself on a very slippery (and expensive) slope if you're not careful.
This 300BHP you're (considering) chasing - is it to get a good launch on the strip, trackdays, fast road use, willy-waving? All valid reasons but different routes to achieve the same result may apply.
This 300BHP you're (considering) chasing - is it to get a good launch on the strip, trackdays, fast road use, willy-waving? All valid reasons but different routes to achieve the same result may apply.
biper said:
As posted before I have every reciept from when new and there is not one for any engine work. The previous owner paid £45 to have an indicator bulb changed so I would have thought that any invoice for a cam or the like would be there.
As a matter of interest, where/when was it dynoed?I've got 285 at the fly, boggo standard, but like the OP, I HAVE TO HAVE 300.... It's only another 15 ponies but three hundred is so much easier to pronounce than two hundred and eighty five when you're on your fourth pint waving your willy about 
Edited by Chilliman on Thursday 14th April 12:31
I have been thinking about more power ever since I put mine on the rolling road.
240 bhp from a 400 = 60 bhp per litre. That is standard (assuming all is working as it should be) and more volume at the same efficiency should give 300 bhp for a 500.
When you look at some of the cars, with a huge list of modifications and mega this and that, it equals an extra 6-8 bhp per litre. Not a lot of return for £5k, at least to me.
A couple of the 450s (haircut mike and 450 paul) beat this with 330+ from 4.5 litres and we are looking at 74+ bhp per litre. If you apply this to a 400 it will be 280-290 ish and a 500 should be 360-370 but it doesnt seem to happen.
Are the 450s better than the 400/500's?
240 bhp from a 400 = 60 bhp per litre. That is standard (assuming all is working as it should be) and more volume at the same efficiency should give 300 bhp for a 500.
When you look at some of the cars, with a huge list of modifications and mega this and that, it equals an extra 6-8 bhp per litre. Not a lot of return for £5k, at least to me.
A couple of the 450s (haircut mike and 450 paul) beat this with 330+ from 4.5 litres and we are looking at 74+ bhp per litre. If you apply this to a 400 it will be 280-290 ish and a 500 should be 360-370 but it doesnt seem to happen.
Are the 450s better than the 400/500's?
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