wiesco pistons for turbo 1mzfe

[jhlaird]

I just recently melted a hole in my #1 piston running 10psi. I am looking at getting some wiesco pistons and probably K1 rods made. I am going to run 15lbs and eventually 20. What compression ratio and overbore should i get? I was thinking 8.5:1 and .02 over maybe .04 if thats safe? Will I need to get better head studs or anything else? I anyone can help out I'd appericate it.

[lemegacool]

before putting wisecos in i would try to find the cause on the meltdown... because you wouldnt want to melt you new wisecos...

my opinion is that you probably ran lean as hell...

i'm no pro in this but the CR you wish to get is imo correct if you plan on running big boost...

and overbore is determined by your current bore measurement (or after honing)

while you will be in the engine i would highly suggest you install ARP fasteners

also do you have an account on solaraguy.com? you might have more answer posting there in the forced induction section!

[bigbird]

running that much id definatly suggest APR head studs and some better rings.

[jhlaird]

I'm using a AEM FIC and I put rx7 460cc injectors in. My guess is that the melted pistons injector wasn't flowing as much as the others. I have an AEM wideband and my A/F ratio was staying in the 12-13 range. Not sure tho. I think my rings are bad too. Did a compression test, only at 90psi in the other cylinders but i didnt hold the throttle open (it said to in the service manual).

I checked ARP and they dont have any main or head studs for the 1mzfe. Will I just have to get those made?

[MR2Jedi]

You won't get a correct C/R reading without the throttle being open.
460cc doesn't sound like a large enough injector for the the boost pressure you're wanting to do. I would go at least 550-600cc.

[lemegacool]

i was wondering i plan on using the fic too on my 1mz! actually i already bought it lol

did you have any problem with it or is it running strong?

[jhlaird]

Ya I had a problem with wiring the cam and crank sensors. For some reason the car wouldn't rev past about 3500rpm, when I first hooked up the FIC. The directions tell you to intercept the cam and crank position sensor signal and ground wires. I would have to look at the wiring diagrams again to be exact about all this but, there is a splice piont in cam and crank sensor wiring both ground back to the ecu in the same terminal. What I did was intercepted that same wire and ran it to the FIC for both sensors then both sensors from the FIC back to the other end of that wire. Apparently the ECU didnt like this and would cause that problem. What i did was find that splice point and run an extra wire from the cam sensor to the FIC. Then wired both returns from the FIC to that terminal.

Idk why this worked but it did. If you dont understand I can try and explain it better. I was also having a problem with the MAF maxing out or something. Under boost the ECU would freak out at some RPMs because I think the MAF reading was to high. It sounded like I was hitting a rev limiter and the A/F ratio would go off the chart rich. So I clamped the MAF voltage at 4v and had to reduce the MAF readings by 10-13% in the FIC map under boost.

Im gonna get my rx7 injectors flow tested to make sure that wasnt the problem. I will probably stick with these and run a little higher fuel pressure. They were only at 60% duty cycle under 10 maybe 12psi at 6000rpm and a 12.5 fuel ratio. Hopefully I'll be good =]

[lemegacool]

Originally Posted by jhlaird

Ya I had a problem with wiring the cam and crank sensors. For some reason the car wouldn't rev past about 3500rpm, when I first hooked up the FIC. The directions tell you to intercept the cam and crank position sensor signal and ground wires. I would have to look at the wiring diagrams again to be exact about all this but, there is a splice piont in cam and crank sensor wiring both ground back to the ecu in the same terminal. What I did was intercepted that same wire and ran it to the FIC for both sensors then both sensors from the FIC back to the other end of that wire. Apparently the ECU didnt like this and would cause that problem. What i did was find that splice point and run an extra wire from the cam sensor to the FIC. Then wired both returns from the FIC to that terminal.

Idk why this worked but it did. If you dont understand I can try and explain it better. I was also having a problem with the MAF maxing out or something. Under boost the ECU would freak out at some RPMs because I think the MAF reading was to high. It sounded like I was hitting a rev limiter and the A/F ratio would go off the chart rich. So I clamped the MAF voltage at 4v and had to reduce the MAF readings by 10-13% in the FIC map under boost.

Im gonna get my rx7 injectors flow tested to make sure that wasnt the problem. I will probably stick with these and run a little higher fuel pressure. They were only at 60% duty cycle under 10 maybe 12psi at 6000rpm and a 12.5 fuel ratio. Hopefully I'll be good =]

ok well i'll re read that tomorow after i had sleep lol but thanks man! ive heard these problem for the 1mz and fic and i would like to hook it up correctly the first time... what year is your 1mz? mine is 1994

yeah good call on the flow rate... now i need to get my set of 2jzge injectors tested... or i could rig up a flow test bench...hmmmm

yeah you need to clamp the maf so it cant see boost! seems like you figured this out

did you do the tuning yourself? if so then i'll keep in touch with you since i've never used such a device as a piggyback before and there a bunch of things to do and i dont want to mess anything up lol

also what fuel pump are you running?

oh! and also

[jhlaird]

Yeah, I did the tuning myself. The FIC will make a base map for you based off original and new injector size, rpm and MAP. Thats what I used and went from there. I'd be more than willing to help out too. Here is where I got the wiring diagrams. They also have every manual there too!

LINK REMOVED

Mine is a 99' I have a walbro 255. I can post some pics if you want. Although I can't till this weekend, my car is back home. It's in a 91 mr2 tho lol It's pretty sweet. I have a water to air intercooler in the trunk!