D16y5 Z6 head FJ / Vitara NO POWER!

[aLiEn_CRX]

i have recently built a y5 block and z6 head with the new style fj I-beams. i have put it together and it runs but when cold it idles real low, which i am assuming is because the coolant lines that are going through the throttle body are not hooked up, but my main concern is that it will idle and idle and idle and i can rev the motor sitting still..... BUT when i go to take off it has absolutely NO power AT ALL. i can be @ full throttle and nothing. it pops back through the intake which i have already checked the timing tons of times i have tore down and bolted the head back multiple times, being i had compression issues because the machine shop didn't do my head correctly and i had to trace the problem down. but i am now @ like 115-125 psi of compression on all cylinders. the motor only has like 2-4 hrs of runtime on it. but me and my buddies are both kind of out of ideas at the moment so any constructive help would be greatly appreciative.

s/n: its on a stock p28 map using the S300

[Jdm94Coupe]

are you using the stock map sensor?

[silversol]

Timing is off

[JF868849]

timing is off forsure bro i had the same problem until this weekend ive got the same setup basically except i got eagle rods and i checked my timing multiple times and it was always on but sure enough it was off when i checked it this weekend.. so i put it on and my motor has tons of power lol man it pissed me off really bad lol but i finally figured it out lol. gl man always good to see another sohc setup ftw!!!

[aLiEn_CRX]

yea i am using the stock map until im broke in, and no i checked it everytime and it was right on everytime hell i checked it 5 times before i put the motor in

[JF868849]

yea i am using the stock map until im broke in, and no i checked it everytime and it was right on everytime hell i checked it 5 times before i put the motor in

i did to man i swear i did but i promise you its off i could almost promise u lol just mess with it go a tooth forward crank it see what it does if no better go back 2 se what it does i swear its off man ive been driving mine breaking it in thinking it was just really that slow because 7to5 comp but it was because my timing was off..

[FasTech]

Yep, timing is off good sir. Think what you will, we all make mistakes time to time.

[Jdm94Coupe]

That's the only thing about the y series blocks with the z6 head, the timing takes some getting used to. U aren't using your y5 cam gear are you? And what timing belt did you buy? Also what water pump too?

[aLiEn_CRX]

well i thought about moving it forward and backward but didnt wanna mess it up, but at this point i dont care so i was going to go try it later today, and its a whole z6 head... cam, gear and all water pump is a y5. and i do appreciate all the help, ill try it and see if i dont f*** up some more

[Jdm94Coupe]

I'm pretty sure u need a z6 water pump too.

[JF868849]

well i thought about moving it forward and backward but didnt wanna mess it up, but at this point i dont care so i was going to go try it later today, and its a whole z6 head... cam, gear and all water pump is a y5. and i do appreciate all the help, ill try it and see if i dont f*** up some more

yea man try it and see what u get lol

[JF868849]

I'm pretty sure u need a z6 water pump too.

it all depends on what timing belt he uses
if he uses y5 belt= y5 water pump

[aLiEn_CRX]

well come to find out i retimed and readjusted the valves to be sure again and it did the same thing.......... THEN my buddy said try a different ecu and it worked and i drove it home so the map on the s300 is kinda wrong i guess but thats just the last thing that was wrong i had other events that caused some issues as well but at least the problem is solved for now, thanks everyone for the help

[Jdm94Coupe]

it all depends on what timing belt he uses
if he uses y5 belt= y5 water pump

Yea but he's using the y5 waterpump with a z6 head. I'm sure he's using a z6 timing belt