i have a b18a1 non vtec motor with some respectable mods:
stock cams and cam gears
titanium valves (custom)
valve springs and retainers (designed to handle up to 11,000 rpms but i’m not doin all that now)
stock rods/pistons/crank but will be replaced with the following:
ITR crank
Custom 9.2:1 compression pistons
and titanium rods
anyway, any recommendations on cams and cam gears? someone told me that i could stick with stock but wont handle the power i’m going after (270-300 whp)
i will be using a GReddy turbo timer and an Apex-i boost controller. do you guys think that with those mods and a 2.75 inch custom (mandrel bent) exhaust, that i would be able to achieve those numbers at about 14psi of boost or am i gonna need more. turbo is a hybrid t3/t4 from turbonetics that came off of a local supra (rebuilt to be like new so i will be really easy on it for a couple hundred miles of course). i know all about the bad lag times but i’m hoping that with the 2.75 inch exhaust that i will be able to keep a little backpressure and get it spooled up pretty quick depending on how well this boost controller works. anyway, any help or recommendations/suggestions would be great.
oh yeah will be 3 inch intercooler piping all the way to the manifold. and does the skunk2 manifold work well for boosted applications or not, i’ve been told good and bad stories about it. thanks for all the help.
and will i have to remove the performance chip in my ecu or will it be fine, all it did was change the rev limit and changed the fuel curve etc. like most prf. chips. i’ve been told its gotta go. it was actually two seperate chips one for the rev limiter (8500) and one for the rest. anyway, i’ll stop blabbing now this post is getting quite long.
you should be in that power range wiht the 2.75 exhaust and decent sized t3/t4 on 14-15 or so psi. i dont think the lag is gonna be as bad as you think. im running a 57 trim t3/t4 and i hit 10 psi at between 4100-4300 in 4th gear.
i would not do 3" intercooler piping. you shouldnt need any more than 2.5 inch. im personally running 2" from the snail to the i/c, and 2.25 from the i/c to the throttle body (as per the inlet and outlet sizes of my drag kit intercooler), no problems. i know many vw guys running 2" i/c piping on 1.8T motors making well over 300whp.
skunk2 manifold will be an extremely nice addition to your motor setup. it will help your motor keep the torque up in the higher rpms, thereby increasing peak hp and the rpm at which it occurs.
if the chip is designed for a naturally aspirated motor, it will have to be removed, for it undboutedly has your ignition timing advanced way to much for a turbo application.
thanks i appreciate it. if anyone else has some more tips that would be great, i just took off the head today and i’m glad i’m doing this now, cuz a couple of the valves (1 in cylinder 1 and 1 in 4) looked pretty bad. the retainers look a little beat up but they were apparently holdin up well, got crower cams in the mail today, stage 2 turbo application. looking forward to new skunk2 cam gears, just ordered them so its gonna slow down the process a little but its all good, cant rush perfection or as some would say, good things come to those who wait.
why fuss with the head and crank, can’t you reach those goals without them?
what about just slapping on a vtec head for the superior flow but keeping the ls redline?
hmm. backpressure will do the opposite. the best turbo exhaust is no exhaust.
much too big ic piping for your goals. 2-2.5 like he said.
oh man. what exactly is managing your fuel? FMU? your management and tuning is 10x more important than all the other stuff combined. keep the stock rev limit of your block.
please do yourself a favor, pickup maximum boost by corkey bell for 34.95 or less. read it. read it again. read the hard parts again on the toilet. then, you will never have to ask any of these questions again, since you will know the answer before you even ask it. you sound like you are serious and have serious parts. don’t let some goober destroy your motor and you having no clue why it happened. good luck.