carb/95 ron?

[doggydowg22]

Hello all

I am going to either buy another or rejet my own carb.Is it possible to set up a carb so that we can just use 95ron rather then paying lots more on 97 ron its more exspensive and sometimes wen on road trips hard to find.

As a rough guide (I know all cars are different) for an engine running a t25 turbo, fmi and a bar of boost what sort of jets should I start off with?

Thanks Paul.

[James5]

Hello all

I am going to either buy another or rejet my own carb.Is it possible to set up a carb so that we can just use 95ron rather then paying lots more on 97 ron its more exspensive and sometimes wen on road trips hard to find.

As a rough guide (I know all cars are different) for an engine running a t25 turbo, fmi and a bar of boost what sort of jets should I start off with?

Thanks Paul.


Mate RON is a rating of how good a petrol is at resisting knock, don't be a cheap skate if your runming more than standard boost you should be using it, even an afr gauge will show that your afr's are ok but it will not tell you if your engine is detting / knocking

[Markey Mark (BD)]

As a rough guide (I know all cars are different) for an engine running a t25 turbo, fmi and a bar of boost what sort of jets should I start off with?

Thanks Paul.

As a very rough guide

Standard 1.2 main
1.1-1.2 second stage
Satndard 1.0 or 0.9 ac jet

[Adam 005]

get your self an afr gauge wideband type and the help of a member who like to set up carbs.
95 ron is a bad idear on any thing over standard boost:)

[Matt@CodeRedMotorsports]

Just out of interest...does everyone know about the addition of 10% ethanol to regular R95 fuel in 2010?
Renault issued a TN about the compatibility of engines in the range and possible engine damage....I'll dig it out.

[James5]

Just out of interest...does everyone know about the addition of 10% ethanol to regular R95 fuel in 2010?
Renault issued a TN about the compatibility of engines in the range and possible engine damage....I'll dig it out.


Matt didn't realise this was the case :crap:, so adding ethanol to the fuel does that make it have more oxygen content in it, I suppose that would cause it to run leaner. I assume some more modern car's ECU's can compensate for this with running soe more retard retard

[Matt@CodeRedMotorsports]

I'll find out, with most tech notes from Renault....I 'file' them in a big folder and use that folder to stop cars rolling off the ramp.......
I'll take a gander in the morning, I think its more to do with seals and stuff being eaten away...could be wrong, I do know some modern Diesels don't like E86 Bio fuel, or what-ever its called now....

[doggydowg22]

As a very rough guide

Standard 1.2 main
1.1-1.2 second stage
Satndard 1.0 or 0.9 ac jet


Thanks for replys guys so 95 ron is a def no no.

From the above jet sugestion I will be needing a standard carb then.I reckon im probably running a group a jobby starts with no choke in this mornings:eek:.

[SCHWARTZ]

having the choke removed dosnt defo mean its a group a measure the sive of the venturi standard is 25mm grp a 27mm ish. If it has a 25mm venturi it will most prob be a case of putting a 120 main back in it abd getting rid of the 150 or what evers in there.

[Alex]

Absolutely nothing wrong with running 95 RON fuel on higher than standard boost. I would only use it if you're running VERY high boost and/or advanced ignition, and right on the limit of det/knock. You certainly shouldn't have to rely on 97+ RON fuel for a bar of boost.

As ever, it's all in the set-up....... :)

[Mart]

Absolutely nothing wrong with running 95 RON fuel on higher than standard boost. I would only use it if you're running VERY high boost and/or advanced ignition, and right on the limit of det/knock. You certainly shouldn't have to rely on 97+ RON fuel for a bar of boost.

As ever, it's all in the set-up....... :)

Hook, line, sinker :agree:

95ron is all Trusty & Whitey ever ran on.

[BriC]

Absolutely nothing wrong with running 95 RON fuel on higher than standard boost. I would only use it if you're running VERY high boost and/or advanced ignition, and right on the limit of det/knock. You certainly shouldn't have to rely on 97+ RON fuel for a bar of boost.

As ever, it's all in the set-up....... :)

I was thinking this too :confused: I've only ever used 95 RON on any of my GTT's (some standard boost, some up to 18psi) and never had one issue.

[djinuk]

I personally run 97 ,

18 psi.. i guess more than anything its just the risk, and i dont drive it daily so putting a better quality fuel in dosent really cost me that much more.

[doggydowg22]

I dont drive the car that ofton once a week so was thinking by the time I get to the bottom of the tank the 97ron fuel has probably degraded into 95 anyway:)

Im going to get hold of a standard carb use 95,drill out 2nd stage,get it on the rollers and see what fueling is doing,I cant afford a wideband at the mo else I would go down that route.

[Matt@CodeRedMotorsports]

Sorry for the late response..... busy with racers...

Renault tech info.
No.2233 issue oct 2010.

Information:
As of 1st jan. 2011, unleaded 95RON-E10 petrol containing up to 10% ethanol, will become the mandatory regular grade fuel across the European Union.
Member states are using the official lists published by auto manufacturers to estimate the numbers of vehicles that will necessitate the continuing availability of standard Unleaded 95RON petrol (conventional Unleaded 95-octane petrol containing up to 5% of denatured ethanol).

Compatability:
Other than a few exceptions listed below all Renault vehicles manufactured after 1997 are E10 compatible. Renault Engineering has validated this compatibility.

Exceptions:
Renault 19 All engines.
Megane 1 F5R 700/740 IDE.*
Laguna 2 F5R 782 IDE.*
Laguna 2 2.0 F4R 782 Turbo.
Espace IV F4R 790/763 Turbo.
Velsatis F4R 762/763 Turbo.
Avantime F4R 760/761 turbo.

(note, the one s I've marked with a '*' are not ones we use in many of our converted cars, but, the F4R turbo's are something we may be involved in within our reach for conversions).

Also every manufacturer will produce a list of its own E10 compatible vehicles.

Hope this helps......Matt5