So basically you are building a pump gas tune but you want to run high boost. You kinda want the best of both worlds. Personally I think you should create the typical 22psi daily street tune. If you want to get silly crank the boost to 28 and add race gas.

I'd rather have a 22psi - 17* - 11:5 AFR daily driven EVO.

 

when you were running 28psi.....what was the taper to at high revs?

CJ

 

taper was around 21ish....


i run meth typically... i just wanted to test different boost levels on pump and meth

 

i c. I know the stock turbo has a serious problem with keeping boost over 21-22psi at high revs, no matter what you are using to control boost.

i prefer to run either pump or race gas, i'm not a believer in METH, or ALKY.......I tune these set-ups a lot, so i know the why you like them, but bad things can happen if something fails!

have you ever tried just water injection? I don't see alot of people considering just water injection. It does not directly raise you detonation threshold, but it does indirectly by cooling the intake charge and increasing charge density.

If i were you, i would try tuning for 25-26psi w/water injection and see how much timing you can run. This would be a great solution and will ween you off your bad meth addiction!

CJ

 

oh yeah, if you do decide to run strait water injection, keep AFR's as if you were running strait pump gas. Don't try to lean it out.....11.0-11.5:1 max lean.

CJ

 

iTune,

I've found a fair benefit in leaning out the afr with WI instead of fooling with timing.

It is counter intuitive because I've always heard timing adjustments are more powerful than afr. However I feel wi better suits a leaner fuel mix than more timing. Same general effect, just a different route. Plus the efficiencies of using less fuel makes for a better burn.

 

Few things...... You are not "fooling" by adding timing. You see, water is not a fuel.... it does not have a octane rating.....it does not directly raise the detonation threshold. Fuel, on the other hand, has it's own cooling effect. If you can increase the charge density, to a certain extent....you will slow down flame front propogation...which, coupled with water injection(which also cools the intake charge and raises the charge density directly) will allow you to advance ignition timing, which puts the peak cylinder pressures later in crank angle, where there is more leverage on the crank shaft. This increases power.

Now, as stated above.....keep fuel at pump gas ratios, because....water is not a fuel and will not have a effect on octane(detonation resistance) directly....all it does is cool the intake charge and allow for more timing and boost safely. Leaning out the AFR will not make more power than more timing and more boost.

CJ

 

water injection is good for a car thats nearly maxed out on pump, where the motos just cant handle race gas power... not the case with my basic setup...


im not worried about blowing up, i rather enjoy it than worry about it. im confident in my install and tuning. its all fate from there....some people have a ton of issues with their stock car and some have none with 550whp on stock motor.. 28-29k and no problems so far...

those who want more power and are worried can go with a kit with a smaller nozzle so if something happens youll have a verry very good chance. with my nozzle if my kit fails and im wot i have 2 seconds tops to realize it and even then its a gamble....

we'll see =-)

 

That is why race gas owns all ..... including your wallet.

Tuning high boost on pump gas is more dangerous than an injection system with safety in mind. One tank of bad gas, on unforeseen cold snap that increases boost, or one heat soaked pass to many and the next thing you know the head gasket will be done. Most people are tossing in head studs just to run that kind of boost on race gas.

 

I totally disagree. Water injection can benefit all set-ups no matter what boost pressure being ran............ It's the science that says so....not my opinion. Whenever you can raise charge density, lower charge temps and run more ignition advance, you will make more power at any boost level.

CJ

 

I agree, but think water + Meth or Alk is even better than straight water. Add a Zeitronix WB and failsafe setup and there should be very little risk (IMHO).

 

The way I see it... Meth > Alky > Propane > Water

 

I fixed it

 

i agree with that...

i thought about just using water to DD but it doesnt seem worth the hassle

 

lol kit on the way ;-)