Hope you guys can help me out here, its a b20vtec Old dyno numbers is 332whp with a stock b16a cams and intake manifold with a t3t4 e cover 57trim comp wheel and then changed few things,,, itr intake manifold and cams 98 spec i think also changed the comp wheel to a 60trim same cover.. And hit the dyno, lost 20whp through the whole power band... I remember the cams were installed tdc piston number 4 because the up mark on the cam gears was on the bottom 6 o'clock nwei hope again you guys can help me

 

Did you re-do a valve lash adjustment with the new cams? Did you do a compression test? Did you re-tune for the turbo and cam change?

 

Yes retuned and lost 20whp, thats what im gonna do next comp test but is it ok to instal the cams with number 4 piston at tdc?

 

# 4? You mean #1 right?

 

when #1 is TDC, so is #4....

 

yes but not the valves^^^

 

The valves don't have a TDC. The cams do. Considering that he replaced the cams, which control the valves, and considering the motor is capable of running...yeah, safe bet he didn't do some dumb **** like that. If 4 is at TDC, then 1 is also at TDC.

 

Well he power loss is similar to what would happen if you didn't time it right (off a tooth)

 

same dyno and correction factor?

 

the piston bt the valve events are different but either way i doubt thats the problm cams 180 out would run like complete **** if u can keep it running

 

he never did say if he check the valve lash or reset the valve lash. maybe the valve springs are to weak to control to extra lift from the itr cams? are you using stock valve spring ?

 

Like suggested, you should do a compression test next and compare it to your first assembly.

 

Do i have to touch the valve lash even thou im using an oem cams?? I thought the specs were the same with a b16a cams thats why i didnt bother

 

[QUOTE=bergercurtis;50783195]Like suggested, you should do a compression test next and compare it to your first assembly.[/QUOTE

The thing is i dont have anything to compare ot with, but what numbers should i be expecting

 

Yea same dyno and correction, also with fans blowing the intercooler before we did not need those fans, not sure whats the iat at

 

What we did is zip tied the camgears from the timing belt to make sure it will be back on its same exact tooth

 

B20B or B20Z? Do you know your compression ratio?

 

B20b with p30 head, stock pistons with just eagle rods

 

yes you must do a valve lash reguardless.

 

cam install is out of the equation right, it started right up and just lost 20hp

 

Did he adjust the tune or did you run the same one?

 

Afaik i told him the changes thats why i need a retune, funny thing is looking at the graph the final run looks like the same with the prev tune but not that totally exact copy

 

Also, since your distributor had to come off to replace the cams, did you reset your ignition timing? It sounds like you took a lot of liberties and shortcuts that you really shouldn't have.

 

Agreed. And it could be the difference of him toning down the timing to a more conservative timing if he had a really aggressive advanced timing before. This is assuming changes were actually made to tune.

 

This sounds boarder line troll post just sayin lol