3800 supercharger on a 3400

[jimraelee]

hello all.... due to the popularity of the new 3800 supercharger... I was wondering if anyone has ever put a super off the 3800 eng onto the 3400. Now im sure that this wont be a direct boltup... but if the proper adapter plate was made... maybe this would fly??? It would go into a grand am... and if works good will make second for my silohouette van the wife drives... I know lots of machine work but ive a buddy that races and has his own machine shop... jim

[3100GAGT]

well the 3800 is a 90 degree V6 and the 3400 is a 60 degree V6 so tou would need an custom adapter plate and i would raise the supercharger up over the head and it would most likely not fit under the hood.

Just swap the hole thing to a SC 3800

[v6h.o.]

i looked at doing this previous. was going to make a boxed lower intake from a 3400 lower, but the M90 is too wide to fit the fuel injectors and even a custom fuel rail setup. (would have ditched the whole upper plenum alltogether)

IF, done right, a M62 might be able (still very tight for space) to fit between the injectors and a custom rail with a custom modified lower intake, but again its very tight, ditch the P/S pump and run the s/c pully in that area, but this still will require hood clearance (hole and a scoop or cowl scoop to cover the s/c sticking out of the hood)

Marty (racerX11) is doing a M90 on his engine, i have a M90 waiting for me to get around to making a bracket system and mounting system for my brothers 3400 that will be going into his 91 Jbody. the way im setting mine up is similar to marty, the s/c separate from the engine's plenum and intakemanifold.

[Fierofiend]

Not exactly an M90, but there is someone that makes/made? a supercharger for the 60º GM V6. It was designed for the S10 trucks, but works on the cars. Not sure of all the info off the top of my head...

[Guest]

Fagoel.

B&M also made a very limited number of blowers for the 660

Both of the above supers were for the iron head (genI) version only.

[phantom505]

You have good engine, there is no need to swap it. I have GTP guys thinking that they should get a GA and put a turbo on it. It has so much more mid/high power.

If you are into 60ft times (which I bet mine will be pretty good) and cheap thrills then I guess a 3800 with a roots if for you. Otherwise keep the 3400 and slap a turbo on that puppy.

[dbtk2]

You have good engine, there is no need to swap it. I have GTP guys thinking that they should get a GA and put a turbo on it. It has so much more mid/high power.

I would love to know what GTP guys you have thinking this. The GA is lighter, but thats its only advantage. It has a smaller displacement engine, so it doesn't have as much potential. There are CSC's available for the 3.8, and turbo conversions are becoming very popular also. I'm not saying the 3400 is a bad engine, because it isn't by any means a bad engine, but your not gonna tell me it will make more power than a modded L67.

There is no replacement for displacement.

Shawn

[phantom505]

If you want to go ask go to www.grandvisions.com. They are the ones that were in it. I think there was 3 of them total.

The 3.8L is a slug. It weighs too much, it knocks too much, and the Roots SC is pathetic. Their gear ratio stinks. No IC. I can go on and on. The reality is that .4L (a whole 20ci if you do the math) of displacement doesn't do much when you have to make so many changes. Yeah, if they turbo w/IC it that would help. At that point why bother? A 60*V6 will eat them on weight still. So the only advantage is weight right? GM is putting the 3800 out to pasture. If you don't believe me fine, but ask yourself this, what's up with the 3.9L 60*V6 and the Bonneville getting the V8?

The replacement for displacement is boost and better use of power. If you don't think so, then that's your problem. I'm sick of people thinking that displacement is everything. If ricers have proven one thing, it's that displacement means very little.

If you don't think so then get your butt to Ft. Wayne when I'm up there next. I'm there once a month for drill. First weekend of next month I'll be strapped to a dyno for tuning.

So yes, I will tell you that there is a replacement for displacement.

[phantom505]

Here's some theoretical numbers... (for a turbo)

Assuming perfect use of power on both motors (both redline at 6000RPM):

210 ci - 10 psi - 355 crank HP - est at wheels 284
230 ci - 10 psi - 389 crank HP - est at wheels 311

A difference of 27 wHP (20% loss). We'll say 30 wHP for rounding sake. That's assuming the 3.8L doesn't knock itself to death, which it often does. Then you get into weight and everything else. Now tell me that there's enough advantage to justify 3.8L being superior.

Now just for shits and grins let's add 1 psi to the 3.4L.

210 ci - 11 psi - 368 crank HP - est at wheels 294

There goes almost all advantage. I can just about garuntee you mod for mod, the 3.4L will boost higher without knock.

[brian89gp]

Enough of the 3800 crap, it has been debated enough. No more. Either post about what this thread is about or take it to the Off Topic section.

[xxrollin]

My 2 cents worth, it you want a supercharged V6, might as well do the swap. I dont see any advantage to pulling that supercharger off and putting it on a 3400.. (I agree totally with the 60* being a better engine also, seems to rev more freely and smoothly). But if you want to make things interesting, go for a centrifical supercharger, (bad spelling here), they make better boost and whatnot. Then you'll be able to intercool it also. But turbo's are starting to make a huge apperance in about all V8-type magazines. So the interest is going toward turbos in all the camps.......

[AaronGTR]

Back on topic, putting an M90 blower from the Grand Prix GTP on a 3400 equiped car is neither practical, easy, or economical. It requires too much custom work to relocate things that would get in the way, and would stick up thru the hood too. Basically there are much more practical and efficient ways to boost that motor.

[JubjubW]

wellll..... m90 on 3400

[Nick-G]

wellll..... m90 on 3400

That's an m62...

[JubjubW]

is it? my bad i just took what a guy said from my other forum