Moderators: eastlmark, BIG_MVS, phildini, Test Moderator, Alpineandy
Club Member
7463
Wed Apr 14, 2004 7:25 pm
London
Out of interest whats the diameter of the manifolds on an A610 as opposed to a GTA
Non Member
3709
Mon Apr 18, 2005 7:11 am
Alpine France
Non Member
3474
Thu Apr 15, 2004 8:10 am
Colchester, Essex
mettersl wrote:Tony- are the manifolds standard size on this (by the heads, clearly not later)?
Lee
Non Member
3709
Mon Apr 18, 2005 7:11 am
Alpine France
David Gentleman wrote:andyh877 wrote:blah blah ....
3 litre 12v Biturbo PRV ..... 550 bhp, ran at Le Mans in a Renault factory supported..... what's all the kerfuffle about
Well done Andy...thats what most of this discussion was about...
Non Member
1552
Sun Sep 28, 2008 4:25 pm
David Gentleman wrote:Thats perfect really, the only downside (and don't think of this as a negative) is Tony has also modified his engine too. Id like to see this setup on a completely standard 2.5 engine, (obv need an ecu mod, injectors) to make a good comparison from all the normal cars.
Non Member
3474
Thu Apr 15, 2004 8:10 am
Colchester, Essex
MFaulks wrote:David Gentleman wrote:Thats perfect really, the only downside (and don't think of this as a negative) is Tony has also modified his engine too. Id like to see this setup on a completely standard 2.5 engine, (obv need an ecu mod, injectors) to make a good comparison from all the normal cars.
Well I think it is still a fair comparison. The BMEP performance / ability of the engine (given the OE 2.5ltr capacity and piston is retained) is pretty much determined by the port time-area, and significantly more the inlet at that, and in this case the OE valves and 30 deg seats on the inlet have been retained. The cam in Tony’s engine is a reasonable upgrade, but certainly not race spec, hence the ability of the engine to perform as an air pump is reasonable comparison to OE; certainly to a spec the factory could have shipped originally if they so wished – pity I think.
However, more significantly the better collectors and merge header to the turbo, and indeed the turbo are going to combine to greatly reduce the back-pressure, and hence have a far greater impact on performance of the package and should show some good beans...
This is a nice build, and hope Tony gets the results he’s looking for, certainly John has put this together with a great deal of care…. about time you put this in the project section Tony with some more pics!
Non Member
1514
Tue Apr 12, 2005 12:24 am
Nr Chippenham, Wiltshire
David Gentleman wrote:you can't get round it with boost, if your exhaust backpressure is higher than your inlet pressure.
David Gentleman wrote:Forgot about the Venturi - Another example of a 3.0 with a bigger turbo and making sub 300 at almost a bar of boost.
Tony Smith wrote: More boost equals less lag, so if you wind the boost up on most turbo cars it will reduce lag, it may have a more pronounced step as it comes on boost so the lag seems more pronounced but the time to get on boost will still be less.
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