Performance upgrade???

[planman350i]

Ok, I'm thinking of lavishing a bit of ££ on the wedge. Its currently got a 4 litre block and stage 3 heads plus adustable ecu. Is the next best move trumpets/enlarged plenum/jag air meter etc, or is cheapest bhp/pound just to wack a 4.6 litre short block in?

Suspension and brakes already upgraded btw. Also got rebuilt driveshafts.

I don't really want to upgrade to a bigger wedge as generally happy with condition of car.



>>> Edited by planman350i on Monday 14th February 20:46

[19560]

planman350i said:

Is the next best move trumpets/enlarged plenum/jag air meter etc,?

10% power gain max.

planman350i said:

or is cheapest bhp/pound just to wack a 4.6 litre short block in?

15% power gain min.

Similar price?

[adam quantrill]

What about a supercharger?

;^)

[planman350i]

No idea about price - also begs question which is most fun/practical - stump pull of 4.6 or (presumably) easier revving 4.0...? Hmm.

[planman350i]

adam quantrill said:

What about a supercharger? ;^)

That sounds good but also ££££££!

[350matt]

Depends on how you want the power delivered, the 4.6 will go as soon as you touch the throttle but be all done by 5Kish whereas the short / big trumpet route extends the rev range ( mine pulls usefully to 6K+) but with less mid-range.

Matt

[planman350i]

350matt said:

Depends on how you want the power delivered, the 4.6 will go as soon as you touch the throttle but be all done by 5Kish whereas the short / big trumpet route extends the rev range ( mine pulls usefully to 6K+) but with less mid-range. Matt

Is it possible to go the 4.6 route and not upgrade plenum/air meter? If not, I could be thinkin cart before horse maybe..!

[joospeed]

bigger cc every time in my opinion.

[wedg1e]

350matt said:

Depends on how you want the power delivered, the 4.6 will go as soon as you touch the throttle but be all done by 5Kish whereas the short / big trumpet route extends the rev range ( mine pulls usefully to 6K+) but with less mid-range. Matt

I know that well. My 390 (was 3905cc, now 3948, so theoretically the same as a '4L' TVR engine) revs past 6K but does nothing till it gets wound up. A few times I've chased a 4L Chimaera into a roundabout, only to watch him grunt away on the exit. When my engine spins back up, I reel him in again.
I must admit I don't think the RV8 suits being thraped, grunty is the way to go and if it takes more capacity then why not. However it depends on your perception of fast, Planman: is yur current spec. engine doing it's best? Maybe a little setting-up is all it needs...

Ian

[gf350]

planman350i said:

adam quantrill said: What about a supercharger? ;^) That sounds good but also ££££££!

Theres one on ebay surprisingly! I Dont know if it would be suitable for you engine as it is for a serpentine pulleys (or fit under the bonnet).

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=43045&item=7133589577&rd=1&ssPageName=WDVW

[chunder]

I know you said you weren't keen but pound for pound and as long as you were very selective I would have thought a bigger wedge would be the way to go.

Would probably make more sense for resale value as well however I can undestand becoming attached and wanted to upgrade the current car as it sounds like you have it well sorted.

[adam quantrill]

That ebay item is interesting.

As a matter of cat I have a spare supercharger on the shelf, it's an Eaton M83 a I recall, should suit anything up to 5L. I hadn't thought of asking £1700 for it though!!!

- Adam

[adam quantrill]

That ebay item is interesting.

As a matter of fact I have a spare supercharger on the shelf, it's an Eaton M83 a I recall, should suit anything up to 5L. I hadn't thought of asking £1700 for it though!!!

- Adam

[GreenV8S]

Two of them would go even better.

[gf350]

How about putting 6.6 litre V8 in it.... not really that would be insane! :-)