Needs advice

RAW · Post by **RAW** » Tue Aug 12, 2008 2:49 pm

Guys seriously, if you dont know what you are talking about you shouldnt offer advise to people that need to fix things!!!

Mario, Stock head gasket, fuel pump, injectors, AFM, managment, and more needs to be changed to make 250kw reliably

jon, Please show me how a GT3071R can be anywhere near as responsive as a GT2871R,,, they are not even close!

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

1. You can melt a piston from running lean without ping or det
2. You can melt a piston from running incorect timing without ping/det or lean
3. You can melt a piston from all 3 of these together simulaniously as well.

Just my 2c.

mario_200sx · Post by **mario_200sx** » Tue Aug 12, 2008 2:51 pm

I understand your theory here, not saying you dont know anything.....

But ive seen a car running 216kw on fly standard injectors for the past 2 years with no problems.

Also a 235kw motor with standard injectors running for the past 4 years with regular drifting! This however is the S14 SR20DET VVT motor. Not sure on standard injector size.

mario_200sx · Post by **mario_200sx** » Tue Aug 12, 2008 2:55 pm

Was actually talking about the fact of the internals. 250kw can be made with stock internals......

Headgasket you must replace with performance one for higher than 0.9bar boost.

Higher than 240kw you need to replace with bigger injects?

Sorry if my advice didnt make sense!

But your right with your mods you got there to make 250kw and over.

Pinkfluffybunnys · Post by **Pinkfluffybunnys** » Tue Aug 12, 2008 2:58 pm

I got served

RAW · Post by **RAW** » Tue Aug 12, 2008 3:00 pm

216kw and 235kw are a lot less then 250kw on those tiny injectors, unless you pump the fuel pressure which is not so smart on these old and weak injectors.

If you want power, you need fuel to keep it reliable.

Head gasket has nothing to do with intake manifold presure, its got to do with combustion pressure, you could run .2bar on a T88 and blow the head gasket or 1.8 bar on a T13 and not blow it.

mario_200sx · Post by **mario_200sx** » Tue Aug 12, 2008 3:01 pm

No, not at all!

PM me your email - Wanna get some info from you if I may!

mario_200sx · Post by **mario_200sx** » Tue Aug 12, 2008 3:05 pm

Thats also true yes, thats why I stated up to 240kw..... 240 is pushing it even with a motor thats in great condition.

I mean we are talking about whats the bear minimum, thats is needed here.

If you wanna do it right, your mods is the perfect and 100% correct route to follow! Thats why my motor is being mildly modified!

Cause the rest cost money and me need to wait a month or to for that!

mario_200sx · Post by **mario_200sx** » Tue Aug 12, 2008 3:07 pm

Head gasket has nothing to do with intake manifold presure, its got to do with combustion pressure, you could run .2bar on a T88 and blow the head gasket or 1.8 bar on a T13 and not blow it.

Raw: Talk to me about this? Cam you explain what you meant. What factors need to be taken into account ect?

Pinkfluffybunnys · Post by **Pinkfluffybunnys** » Tue Aug 12, 2008 3:24 pm

Head gasket has nothing to do with intake manifold presure, its got to do with combustion pressure, you could run .2bar on a T88 and blow the head gasket or 1.8 bar on a T13 and not blow it

I think this is related to the flow rates of the turbo a T88 will have more flow then a T18.
Allowing more air to fill the combustion chamber and if a T88 is efficient at that boost level (Which I don’t think it is, might be wrong) also at a cooler temperature as well allowing the pressure on the power stroke to by higher

I might be wrong

Enzio · Post by **Enzio** » Tue Aug 12, 2008 3:26 pm

Its got to do with the volume of air that enters the cylinder.

A big turbo flows more (more volume of air) than a small turbo due to the actual size of the turbo. Thus a big turbo @ 0.2 bar flows the same amount of air into the intake as a small turbo @ 0.8bar.

That's also the reason why some guys make big power at low boost - they use bigger turbos

Gary57 · Post by **Gary57** » Tue Aug 12, 2008 3:38 pm

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.

Speedy · Post by **Speedy** » Tue Aug 12, 2008 3:54 pm

[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.

RAW · Post by **RAW** » Tue Aug 12, 2008 3:56 pm

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.

HancoB · Post by **HancoB** » Tue Aug 12, 2008 4:01 pm

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...

HancoB · Post by **HancoB** » Tue Aug 12, 2008 4:06 pm

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