well after a bunch of wheeling & dealing i am not in possession of an 88 5 speed z24 with aluminum head 2.8...CONVERTIBLE :D

im strongly considering an engine swap to the dohc 3.4 but from what ive seen it -will- fit but not well by any means. id really like to have my machinist/part time engine builder friend of mine port me heads up decently as well as fab me up the lowest sitting intake imaginable so i can just cowl my hood & cover the beauty from the elements.

so heres what i figure-ported up 3400 heads, much larger injectors, eaton m90 off of a gtp, bigger tb, porting all around & a custom intake-heads "decked?" (i believe thats the term for removing some surface area off of the head?) .0035 off to give me a nice quench with the stock gaskets, as well as very free flowing set of headers to match & hopefully a chip tuned by flybynite :D

what do you guys think, are my goals unreasonable?

I didn't think you could put a m90 on a 60*. Let alone a dohc3.4

You may be able to do a centrifugal supercharger. But for all that work, you might as well turbo.

i think the manifold would be a huge problem.

im not worried about the manifold, what i want to know is if the 2.8 with ported 3400 heads can push that much power with a supercharger? they should flow as much as 3.8 heads & people push those past 300 all the time, but is this little 2 valve engine capable of such a feat?

Quote from: no_doz on June 10, 2009, 03:33:01 PM
im not worried about the manifold, what i want to know is if the 2.8 with ported 3400 heads can push that much power with a supercharger? they should flow as much as 3.8 heads & people push those past 300 all the time, but is this little 2 valve engine capable of such a feat?

Actually, 3.8 heads flow like shit. Stock for stock a 3400 head will out flow a 3800 head. Even the stage 4 CNC heads from intense flow 235 cfm on the intake side at .600 lift. A stock 3400 head flows 219 cfm at the same lift.

Is it reasonable depends on a few things. What are you doing with the car? Daily driver, drag strip, etc. Do you want those numbers at the wheels or at the crank? The heads on the 3800 may not be the greatest, but is does have the advantage of 1 LITER more displacement. With a 2.8 you're going to need a pretty serious amount of boost.

IF the bottom line is power, you'd be miles ahead if you took the whole 3400 and used that to turbo/supercharge.

Quote from: GhrarhG on June 10, 2009, 10:00:22 PM


Actually, 3.8 heads flow like shit. Stock for stock a 3400 head will out flow a 3800 head. Even the stage 4 CNC heads from intense flow 235 cfm on the intake side at .600 lift. A stock 3400 head flows 219 cfm at the same lift.

Is it reasonable depends on a few things. What are you doing with the car? Daily driver, drag strip, etc. Do you want those numbers at the wheels or at the crank? The heads on the 3800 may not be the greatest, but is does have the advantage of 1 LITER more displacement. With a 2.8 you're going to need a pretty serious amount of boost.

IF the bottom line is power, you'd be miles ahead if you took the whole 3400 3500 and used that to turbo/supercharge.

i intend for it to be a daily driver, i would like that to be at the wheels but at the cranks just as good to me. honestly im really liking the idea of supercharging the 2.8 rather than swapping it out because itll be something unique, in a light car, with a lot of power (respectively). i intend to get as big of an intercooler as is necessary.

the way i see it, an m90 can flow up to about 350hp max without tearing it up (ive heard more than a couple people say that they just arent big enough for the 3.4 dohc's because they can flow a lot more than the m90 puts out, and ive seen them push a little over 400 with not even a crazy amount of mods) & with good flowing heads & intake as well as raised compression (itd be around 9.5:1) that i should be able to put down the 300, am i incorrect in thinking this?

i also intend to get a good supercharger cam eventually if that has to be what brings it to 300, also if i go ms2 there is a digital boost controller attachment/accessory/whatnot that you can buy and change your boost levels in car with a small digital display, palm pilot, modified gameboy advance sp, laptop, or a netbook-as well as monitor/record everything so you can figure where changes need to be made & etc...

also this will be in an 88 z24 5 speed convertible with manual top (a tad under 2700lbs :D) honestly if i could push 250 wheel horse without a custom cam id be happy & could work towards 300 as i go-does that sound more reasonable?

If you're mounting it to the intake manifold as it is on the stock 3800, you're going to need even MORE hood clearance if you put an intercooler on it(goes between sc & intake). That is, unless you "remote mount" the supercharger like I mentioned in one of your PREVIOUS m90 related threads here. Then you could use a more typical air to air intercooler.

im not too worried about hood clearance or setting anything up, ive got all that pretty well planned & laid out once i get the ok from my buddy to build the intake, what im curious as to is can an m90 flow a 2.8 with ported 3400 heads to 250-300hp?

just single turbo it.... :icon_confused:    Way easier, everyones going to laugh when your FWD superchargers poking through your hood. People on here are on single turbo GPs with bigger turbos, these V6's flow enough for em

sorry for the stupidity fellas, ive never taken the time to poke around an intercooler setup because id always thought it was very standard that the intercooler was to cool incoming air & was piped as such-not knowing that its actually to cool the COMPRESSED air, which means if i got m90-im going low profile intake with very short runners (to minimize hood clearance as much as possible), and no intercooler.

and yes i know a lot of you are probably like WHAT? but honestly -years- ago when i was first starting to read up on supercharging/turbocharging engines & came across the info about intercoolers i obviously overlooked some part of that info & it seemed such a simple part of the whole process so i never looked into it much further, assuming it was something so trivial really left me with (as i understand at this point) no understanding of intercoolers & how they are hooked up in the engine bay, but after doing some considerable reading on the subject my -drastic- misunderstanding has been corrected & now i understand.

if i go roots supercharger in no way am i attempting an intercooler setup-too much piping & it would defeat the purpose of mounting the supercharger with such close proximity to the heads/intake ports as i had originally planned.