3.4 DOHC- Supercharger time

[d.o.h.c]

No, no, no this is not for my car, this is for my brothers car. He has a stock 3.4 with a 5 speed and is tired of going so slow, especially when I run next to him and just keep pulling on him,lol. So we are tossing around the idea, what type of supercharger, centrificul or roots. Here is the thing, how do I pick a cent. blower, are the trim types the same as a turbo, so probably look for one around a p trim? Then as far as tuning goes, its just injectors and a chip, which I can have SCT do, as I know the owner. Mounting it up is not a problem its picking the right one.

[Dave96z34]

Its not worth it. My car is a torq monster but I cant get it to the ground. Go down stream turbo its cheap and easy.

[ez112]

So do GTPs, but they don't have trouble making low 12 second passes. Which I doubt yours is, Dave.

For a SC setup, I would try to mod the 3400 Vortech CSC kit they have out now, and work from there. A OBDII swap would probably work best too.

[Dave96z34]

I agree obd2 swap and a CSC would be great but still think a turbo is a better option.

[Sonyman]

ok i got a question, is there a turbo or supercharger system available for a 91-93 3.4 dohc on an automatic? if so, how can it work and where could i go to get it? holla back

[RedZMonte]

ok i got a question, is there a turbo or supercharger system available for a 91-93 3.4 dohc on an automatic? if so, how can it work and where could i go to get it? holla back

100% custom.

I agree, use the vortec charger that they use on other GM V6's (3400, 3100 ect...) it will be plenty.. i think the vortec would be the best choice.. it is more efficent then a roots and easier mount. the vortec is much more compact and can will offer more mid range/high rpm power. roots are bulky and all low end TQ which on a high strun DOHC motor is not really what you want... the reason why turbo's work so well.

S

[ez112]

Just out of curiousity...why wouldn't you want low end on the DOHC? These engines seem to be problematic when it comes to it. Terminators are roots DOHC and have awesome power curses. It would level the playing field off and really help this thing down the track. If that's what you're into.

Though a CSC on these badboys would be an awesome feeling too. But then you'd just be great on a roadcourse.

[z34phoenix]

the problem we are finding with the DOHC and the M90 is you want it to build on what is there... and not limit it... the roots blowers arent helping as much at higher RPM's yes the boost builds with rpm. but with a turbo it is way more effecent at higher RPM's and as we all know these motors love high rpm... that is wher they make their power... any boost will greatly help this engine. bu it would be a very smart idea to not try and kill the chances for high top end when that is what this motor does....

just like your not gonna take a I4 and hope to make crazy low end Tq's from it.


i still think turbo is the best form of boost for this engine. i love SC's but for the DOHC it needs a turbo. i think the best way to make up for the lq1's lack of low end punch is by gearing. my car has a very good low end pull mainly from the gear swap i did. the real issue again with these cars is the trany..... build a trany with the gear ratios i have, and make it to handle 7k rpm or 7200 and you have a very good package on your hands

[ez112]

A stall too. Trust me I know all about it now. I Preserved an assload of power in my truck with 4.10's and a 2400 stall. And that's on a vehicle made for low end. Gearing would be matched up best when launched at the right spot, and this car needs it WAY up there. Again this is all dependant on what his intentions are.

BUT we can scratch that idea because HIS CAR IS A MANUAL!

[timg]

I would like to see a Rotrex supercharger on the 3.4 DOHC. It should be easier to mount and they are roughly as efficient as a good turbo. The big difference will be low end torque (the Rotrex won't have as much) and lag (the Rotrex won't have any, but it also won't make full boost until near redline).

Tim

[3400-95-Modified]

what is this 3400 kit you guys are speaking of? The RSM kit? I heard thats a pile of crap, or at least the intermediate shaft is run on chitty bearings.

[IsaacHayes]

Yeah, the rsm/zpec, but I think they were just referring to it as in CSC and not the actual kit for use. Not only that but that kit has no tune, they remove the MAF, delete the code for it, and run it un-tuned, with not even a RRFPR!!! KaBOOM!

A CSC would work well on these motors. Efficient and builds more boost the higher the RPM. Mars has a Rotrex CSC on his cammed 3400 where the A/C would be and he is running 12s with a 282 2nd gen cavy.

[3400-95-Modified]

Well any self respecting modder wouldn't buy the kit for the tune, they would buy it and tune it... Also I wasn't referring to that part, I was talking about the drive to the SC... why by the kit if your not even going to use the drive assy, and from what i hear thats the bad part. Hell a oil free SC from Vortech is only 2500 vs 4400 for the RSM kit.

And I dont know of anywhere where you can buy a SC or Turbo kit and have it come with a 100% compatable ready to go tune... so anyone who thinks they can buy a kit and just bolt on and go is insaine... I just look at the RSM as a kit where they took the engineering of the mounting out of the story if you wanted to put one on, since I heard that the drive assy is crap, bad bearings and such and a cheap roll pin that breaks easily.

[ez112]

You're going to have to throw a driveshaft driven CSC kit in a 3.4L, because you sure as shit aren't stuffing the blower on the left of the engine. There would be no way to route the belt. Then you'd have to route the piping all the way to the front where there is hardly any room in the front to begin with. This isn't an SHO. (lucky bastards) Fan reloation a must either way too.

I was just saying a blower like the RSM is what would be needed to get started. Maybe not the whole damn kit entirely because it's expensive as it is, but you're going to pick it up on the cheap anyways because it's not like you can call RSM anymore. We know you hate RMS, but aren't there some people out there that have used it to some success?

The way I think it should be done is the timing belt cover would be be a custom piece that will hold/house the driveshaft. The driveshaft would have to be made longer anyways (new bearings) because it will have to go under the dogbone. The driveshaft unit can be between the 1 o'clock and 2 o'clock area and the belt well wrap around it snuggly after the waterpump and then down it will go to the AC compressor.

These are just some of my passed ideas. Car is no more, otherwise, this project would be in the works already.

[RedZMonte]

exactly. it would have to configured simmilar to this (RIPP eclipse kit)



S