Needs advice

PFB and Gary, both of you are half right half wrong, you both need to learn the difference between Detonation and Ping (pre ignition) and what can and can not melt pistons.

Gary, Meth in water and meth lowers the stoichmetric level of fuel to under 14.7-1 (usualy around 9-1 depending how much you spray) this does not in eccence richen the vehicles mapping, it does how ever lie to your wideband which is built to display lamba at 14.7.... makes you think its richer when it actualy isnt, some people like total retards try to then tune their cars back to 12-1 (odd) under boost not realising that this is now actualy closer to 13.5-1 yet the meth/water keeps it safe due to reduced temps and higher octane, it does not how ever mean this is adding to fueling, its purely people that dont actualy know how to tune when using w/m

Thanks for your reply.

I know what detonation and pinging is and know well what they both can do.

Please explain more on this W/M story. On my wideband when I activate the W/M the AFR richens by 1 point, 12.5 - 11.5, I know we are not adding fuel but then how is the sensor seeing a richer mixture?? 12.5 is RBT so when adding W/M we tune for 11.5, but even 12.5 is lean with very little safty margin. Should we then aim for 11.8:1 without W/M and the with the W/M aim for 10.8:1??

Your response will be greatly appreciated.

[quote="Pinkfluffybunnys"]Hay Speedy

Sorry I am just being curious here but did the car break a ring landing, pit the edges of the piston or start melting\burning the edges
Also what piston? Number 3 ?[/quote]

The piston burned on the intake side on nr1.When I took the piston out,there was a hole,look like melting,between the 2 compression rings to the inside.will add photo,as soon as I figure it out. 🙂

Gary, It goes 1point richer because the stoichmetric ratio of methanol is less than half that of fuel,,, your wide band is set to see 14.7 as stoich not 6+/- .... What you aim for AFR wise is purely dependent on modification, timing, cam size, air flow ectr, some motors will run happy at 12.8 at 300wkw, some will only run clean at 10.5,,, all in knowing how to tune not just what to aim figures at.

The SR20 head gasket blows on engine power/combustion pressure not boost, as above stated its all to do with CFM. High boost with low CFM = lower power, low boost with higher CFM = higher power... key is to find that happy medium to suit the VE of the motor and its intended duty. Much easier to base when a SR20 gasket will blow on power not boost, BUT thats also if you know your tune is 100% safe because a SR20 at 150kw could blow a gasket and a SR20 at 250kw might not... that said, for a decent tune the normal max power an SR20 gasket will last at is 230-240kw, over that its a timebomb that is set by what grade your block and head were machined at. If its all 1's it could last a while, if youve got 2's and 3's your probably not so lucky, all that means nothing with one good knock boosting combustion pressure threw the roof.

hooaawwww...

Howdie newbie...Mind introducing yourself so the rest of us can know where you get all your "Info" from???

How does that old movie saying go..."you can't just climb in the ring with all the acres and think you can box..."

So raw...please enlighten us...kinda curious...
:?: :?:

Well I just got some info on you...You should really change your name so that everyone can know you wrote the SRBible...he he

Gary, It goes 1point richer because the stoichmetric ratio of methanol is less than half that of fuel,,, your wide band is set to see 14.7 as stoich not 6+/- .... What you aim for AFR wise is purely dependent on modification, timing, cam size, air flow ectr, some motors will run happy at 12.8 at 300wkw, some will only run clean at 10.5,,, all in knowing how to tune not just what to aim figures at.

Thanks for clearing that up, that is the way I thought of it but the more you read on the net the contradictory this topic is.

You have PM.

HancoB wrote:

Well I just got some info on you...You should really change your name so that everyone can know you wrote the SRBible...he he

I think this name works better,

Ha ha jip that one works a lot better.

if ppl dont know who RAW is then they really are in the wrong game!

veecee wrote:

if ppl dont know who RAW is then they really are in the wrong game!

hehe True!

After some in-depth research (10 minutes tops) comparing dyno sheets and compressor maps for the gt2871r .64 and the gt3071r .64 it would appear that you are in fact right, so much for that idea 😂

veecee wrote:

if ppl dont know who RAW is then they really are in the wrong game!

You can say that again!

Oi I just know him as Ian or Rezlo...Have a heart! 😂 😂

HancoB wrote:

Oi I just know him as Ian or Rezlo...Have a heart! 😂 😂

dude have you been to the site??

RAW.... rezlo auto works.. 😉 😉 😉 😂 😂 😂

Yeah I never read that i linked it straight to the parts section

HancoB wrote:

Yeah I never read that i linked it straight to the parts section

hehe! see what happens if you do that! hehe

haha just kiddin' man!

Detonation
Detonation is said to occur when the air and fuel mixture in your engines cylinders explodes, or detonates, rather than burning smoothly. This
exploding mixture can cause serious engine damage e.g. damaged spark plugs, melted pistons and melted valves. So it's definitely something
that must be stopped. Below is a brief explanation of detonation - it's not meant to be a full in depth article, just a guide.
Detonation can be caused by a large number of things, but they can be put into 2 classes:
l Pre-ignition of the air+fuel mixture
l Excessive peak cylinder pressure for the fuel used
Pre-ignition can be caused by hot spots in the combustion chamber - this can be the spark plug tip, glowing carbon deposits or other hot spots.
This cause of detonation isn't very common in modern engine as they run fairly clean, with minimal deposits. Spark plugs are often changed to a
lower heat grade - this helps conduct heat away from the plug tip which reduces the chance of pre-ignition.
Excessive cylinder pressure for a given fuel can cause detonation. Excessive peak cylinder pressure can be caused by:
l Ignition timing too advanced - peak cylinder pressure occurs too early in the engine cycle and causes detonation
l Air + fuel mixture too lean - a lean mixture burns faster than a richer mixture, this can also cause peak cylinder pressure to occur too
early
l Effective compression ratio (CR) too high - if the static CR is too high, or you are running too much boost, detonation can occur.
Fuel plays a big part in detonation. Different fuels have different resistance to detonation. This resistance to detonation is measured and a fuel is
given a RON or MON rating. A fuel with a higher RON or MON rating will be more resistant to detonation. Normal unleaded has a rating of 95
RON (Research octane number), super unleaded is 97 RON and Optimax is about 98 RON. Tesco Have just started to sell 99 RON fuel - I've used
this and it seems to be more resistant to detonation than Optimax, and usually cheaper.

I have highlited the reason I think he burnt a piston, my car was mapped according to the water/meth, the timing was increased as far as it could without detonating, I drove with the car like that for a long time with no probs, I then sold it to him, he drove straight to Capetown with no probs, he drove around in capetown for a while with no probs, then the water/meth was stopped and the timing pulled back, not enough though....a few days later....oops....

Thanks everyone,

Took my car to dynotech and they sorted the detonation problem.They ran the car for about 4 runs on the dyno, and a new sound occurred.Sounds like its coming from the lifters :(so they stopped and know if got to fix the sound first and take it back again. The car is still running lean (10.5),but atleast I can drive without detonation.

simple question... why could the guys at Dynotech not sort out the lifter noise?

Hotstuff wrote:

simple question... why could the guys at Dynotech not sort out the lifter noise?

Good Question... Perhaps Faheem was still out of action?