[TurboRay]

(This "question" was also sent to the tech dept thru DevilsOwn "Contact Us" link)

Do any of y'all have any success stories with the 3.8 S/C GM engines? Not being sarcastic, but a couple of inquiries on 2 major forums for vehicles with these engines have only returned unfavorable comments.

Silly me.....I thought that H2O/meth injection would be a relatively-inexpensive alternative to the $$$ "sandwich" intercoolers that most vendors sell for these motors ($700 to $1500 - EEEK).

The forum members generally posted that the various inj systems work great with turbo applications, but that they were extremely inconsistent and hard to tune in s/charged apps. They also pointed out that none of the "big guns" on ClubGP used 'em.

After reading the DevilsOwn tech article on nozzle placement, however, it seems to me that most may have injected the mixture in the wrong place - the throttle body. The article seems to indicate that the best results are obtained when injecting in the manifold ports........is that correct?

Of course, due to the OEM placement of the blower, installing port nozzles in the ROOF of the manifold runners is virtually impossible. Therefore, I would have to install 'em from the bottom, ala "hidden nitrous" systems. I think there's plenty of room to plumb it in the valley area using an aluminum distribution "block" and then feed it with a larger single line thru a bulkhead fitting located in an accessible area of the manifold.

Whaddaya think? I don't wanna embark on a project of this cost, complexity and magnitude if it's not gonna yield decent results!! My goal is to avoid detonation and ECU knock-reduction (KR) on a street-driven 2000 Regal GSE (3.8 S/C) using 91 octane gas (Calif) with anywhere from 12psi to about 15psi boost. It'll have quite a few mods to improve power and I'll be using a 1" phenolic spacer under the supercharger to help alleviate upward "heat soak" from the intake manifold.

THANX, Ray

[dvldoc]

I ran 26 degrees timing with my car and had the best times of any non cammed, grand prix so yes if you set it up right it works great on the Prix, They are just a nightmare to tune.

With our outside mount nozzles and the varies style of nozzle holders we have you should be able to tap the manifold from the outside fairly easily.

You should be able to get 4 nozzle in the intake basically between the runners, 2 on the back side two on the front size, I would email the shop as we have new DO .75GPH nozzles. 4 of those will out cool a intercooler without any problems with the 250psi pump on max.

Just a suggestion.

[TurboRay]

THANX for the quick reply, Doc!

Sooooo.........you suggest NOT plumbing the 6 manifold runners with a jet each from the bottom? Since I'm gonna use a 1" phenolic spacer under the S/C, how about drilling 4 equally-spaced nozzle-mount holes into the edge around the manifold opening......or would it be better to space 'em evenly around the perimeter of the manifold's plenum?

Also, what made it a "nightmare" to tune? Care to share any suggestions OR your BIN files, lol?

THANX - Ray

[dvldoc]

Ah you did not mention the spacer, A few issues with that, if it's like a inch or more you need to mount the nozzle in you will have some issues with it misting properly. You can have about a 1/4 space after the nozzle tip like our adapters which will not impede atomization once airflow is passing over the orifice. The best place for the nozzles if you have the thiness on the spacer is centered at the outlet opening of the supercharger. Once nozzle in the front one in the back.

You can modify the spacer to work at a machine shop were the nozzle sits almost flush to the interior space. We have some metal nozzle adapters that would make this much easier to mount as well.