i also have a IX so i know the fuel pump is better thant he VIII... i understand that if a cars injectors are almost maxed out running alc/meth wont make a difference... does this go for the same with the fuel pump? i rather not upgrade it for various reasons.. should i do it anyways?

im trapping 115 on a mix of 104 and 93 on 24/25 pounds 88 degree night with super humidity

so i figure at 27 pounds on a cold night i would trap 117/118 at that power is it necessary?


thanks!

 

If the injectors are maxed out or near maxed out alky/meth will make huge difference, I was able to on my evo8 go from my pump gas map with nearly 98% IDC to my meth map with 70% IDC. Big difference. So I wouldn't worry about a fuel pump but other could chime in. I have only scene one car blow a headgasket that was running 28psi without headstuds but his car had some other issues going on so I am not sure headstuds were the only reason. If you keep boost under 26psi I think you should be fine without headstuds although once again some other evo9 owners can chime in on that...

 

Head studs are way over rated. Very few people have lifted an evo head on stock head bolts. Many people have developed oil leaks from doing head studs the improper 1x1 method.

 

Yea if your running a stock motor. The oem head studs are made to support anything the oem pistons and rods can give them. Once you build the motor its a way differnt story. Ask any motor builder they will tell you.

 

I am running meth withouth the studs because the 1x1 method is just plain wrong. No problems with 30lb boost spikes.

 

I still have my stock head bolts and have been running alky for a full year now.

 

Not sure where you heard that - it's the opposite. If the injectors are maxed out, alky reduces the IDC, which is a good thing. The fuel pump has nothing to do with running alky or not.

Going from 25psi to 27psi doesn't magically gain that much power. That is beyond the turbo's efficiency, which means you gain less power per psi the more you raise above 24-25psi. When I went from 26 to 28psi, I gained 22wtq but only 6psi. Not every car will respond the same, but that's just an example of inefficiency.

The point of alky is that you have the race gas level power 24/7 instead of just at the track. If you only want power at the track, then stick to race gas.

 

I did the headstuds using 1x1 method. I now have a nice oil leak because of it. I would suggest not doing it.

 

How much boost do you run? (peak and final)

 

I ran at around 28 psi for around 15,000 miles with no problems on the stock headstuds. I'm not saying its the smart or right thing to do, but it worked for me.

 

At sea level it was 26psi peak in 3rd and 22.5psi at 7k, then 21psi at 7.5k.

Here at 6000', it peaks at 26.5psi in 3rd and drops to 17psi by 7k, then 16psi at 7.5k.

 

I asked the same question when I did cams......there are several threads out there......after all the research I did I found that the stock head bolts/studs are plenty good AS LONG AS YOU HAVE A GOOD TUNE.

There are plenty of people that want to blame the stock hardware for their problems when its more than likely a tuning issue. I only run 21 PSI daily but at the track on race gas I yank the boost source line off the WG actuator. This results in spikes 27PSI. I haven't had a single issue with stock hardware.

There are many folks running BIG turbos on the stock stuff for MANY abusive miles without issues. In comparison there are tons of people that have had problems doing the 1X1 method. I know BR and AMS claim the 1X1 method is safe but in all reality there is only about a 60% success rate.

If its not broke dont fix it. If it is broke FIX IT THE RIGHT WAY!

 

I thought it was a requirement when running more than 25 psi on the stock turbo but I guess not.

 

thats what i thought too... i planned on running 26/27 daily and 29/30 at the track... 2 maps..

 

i realize that... im just assuming max power i would make with the alc.. i dont think my car will be capable of going any faster.. and i think with the combination of 40 degree cooler weather, less humidity and couple more psi it could happen..

its been 65ish lately and i can feel much more power and with less humidity the car has been tapering muuuuch less... im going from 22 to 18/19....versus during the summer i would taper to 16/17 on extremely hot days 15.

thats the only crappy thing about living in florida


thanks for the info every1!

i'll stick with the stock head studs and keep debating about the fuel pump, since its not necessary for alky


cheers!