I have a 92 Z-28 with a 5.7 L98 stock engine. I have added 1.75" SLP headers, with dual factory cats, and a flowmaster muffler. I would like to install an ATI D-1SC stage II procharger supercharger (15-20 psi of boost). Their web site says all parts are included and it will work on a stock engine. Do I need to change the fuel injectors or mass flow sensor ? This is a new area for me, be kind.

 

Ky. 92 Z28,

The ATI kit is a bolt on kit, with everything that you need...Replacing the injectors is not necessary, but a good idea (in my opinion), with your car being a '92 it should be a speed density set-up, which means you don't have a MAF.

Also start out with the largest blower pulley that you can, 9#'s boost max. until you feel comfortable enough to start uping the boost.
Here's a pic of the D1sc kit installed on my car with a custom built air filter box


later
larry

 

Yeah get the 4.25" pulley to start out with. The max boost I've seen with a goodyear gatorback belt is 7.1psi. That will be plenty to start with. I also recomend a 255lph intank pump and consider switching over to a 749 ecm if you feel like playing with chip programming.

 

Thank you for your response. I have a few more questions:

1. You recommend starting out with 9-10 psi of boost, and then once I am comfortable up the boost. When I purchase the supercharger will I be asked for a specific blower pulley size so as to set the boost pressure ? Why not go with the upper range 15-20 psi from the start ?

2. I do not like the idea of the ATI air intake filter set-up. In the engine compartment, over the headers and in a reverse flow to the air stream of the car as it moves forward. This design appears to have potentials for adding an extra cooling load on the intercoolers as well as turbulent air flow. Has nayone reported issues with this design ? Maniacc - I love your air intake design, it is sweet and should negate the issues I voiced.

3. Yenko - you recommended a 255 lph intank pump (please explain this item) Assuming it is a fuel pump ATI furnishes a high flow fuel pump with their kit

4. Before I spend the $$ I would like to know if you saw benefits for the supercharger.

 

1. 15-20 psi on a stock motor will equal one dead motor. Start with the largest pulley and go from there. You will be amazed at how much power 6-8 psi will give you. If you build a 8.0-8.5:1 CR motor with heavy duty internals then try 15-20 psi.

3. Yes I'm talking about an aftermarket intank 255 lph fuel pump. Cheap insurance on keeping your motor alive. If you go lean under boost I'm sure you know what will happen. ATI's external booster pump isn't needed and is one less thing to install unless your running a big boost high HP motor.

4. It made a huge difference. My father has a mild 383 tpi setup in his 91 Z28 and my completely stock 305 will run circles around him with boost. I even have a stock exhaust on my car. But I will note that it also made a diff going from the stock 730 ecm w/fmu to the 749 ecm. The 749 ecm came from the sy/ty which was a factory boosted application.

 

Ky. 92 Z-28,
<b>1. You recommend starting out with 9-10 psi of boost, and then once I am comfortable up the boost. When I purchase the supercharger will I be asked for a specific blower pulley size so as to set the boost pressure ? Why not go with the upper range 15-20 psi from the start ? </b>
Yes, 15-20#'s boost on a stock motor, will most likely net you a blown up POS...I'm not saying that it can't be done, but if this is your first endeavor into boost applications, it's best to start as low of boost as you can. Any reputable ATI dealer should ask about your application and how much boost you plan to run...

<b>2. I do not like the idea of the ATI air intake filter set-up. In the engine compartment, over the headers and in a reverse flow to the air stream of the car as it moves forward. This design appears to have potentials for adding an extra cooling load on the intercoolers as well as turbulent air flow. Has nayone reported issues with this design ? Maniacc - I love your air intake design, it is sweet and should negate the issues I voiced.</b>
I too did not care for the air filter sucking the hot air off the headers, that is why i had the air filter box fabricated.

<b>3. Yenko - you recommended a 255 lph intank pump (please explain this item) Assuming it is a fuel pump ATI furnishes a high flow fuel pump with their kit.</b>
The ATI pump that comes with the kit is supposed to be a 255lph pump (so i was told by ATI), but it is obnoxiously noisey, so i too changed my in-tank pump to a Walbro gsm340 (255lph). you can get by with no problem with the ATI supplied pump.

<b>4. Before I spend the $$ I would like to know if you saw benefits for the supercharger.</b>
Yes, it has to be one of the best "seat of the pants" mods i have installed on any of my automobiles.

later
larry

 

I have my D1SC, but havent installed it yet, ive had some minor tuning and a custom chip burned for my application (bigger injectors, cam ect.) what is needed to do the 749 ecm swap, are they hard to find, what is required, is it better than the 730 for a supercharged app ?

 

If you go to the tech articles on this site they posted a little write up I did on the swap. It is very easy to do and you won't need a fmu anymore. Now the computer will control fuel and spark under all conditions, so yes in my opinion it is better than a 730 for a boosted application. Only downside is you need to be able to burn your own chips.

 

Most of the questions you are asking have been addressed in the Twin intercooler post. And not to brag post.

Tuning will be a requirement on a boosted car and need exrta fuel and ignition mods.

 

Mypontiac,

Thanks for sending me to the twin intercooler post, much information. One statement you made was: Tuning will be a requirement on a boosted car and need exrta fuel and ignition mods. I have seen little information on these needs other than using a high flow fuel pump and the FMU. Additional information would be appreciated.

Maniacc,

Any problem with engine cooling after the installation of the the 3 stage intercooler ? I am leaning towards the THF intercooler system.[COLOR=red]

 

Actually for the fuel, it will be the FMU and ATI inline pump as you said. Also, probably larger injectors.

You will need an MSD or Jacob's ignition system and larger plug wires. Need to run a cooler firing plug, 2 settings cooler. Check previous posts and vendor recommendations.

Check ignition vendor's recommendations for gap settings too.

Of course, after altering the car to this level, you will need a custom prom.

Have fun and break out the credit card!

 

I don't totally agree with mypontiac.

I run my car on the stock prom and have for 2000 miles (2 years),
also i upgraded my ignition (MSD6btm, MSD blaster coil, MSD Distributor, and MSD 8.5mm wires), but it's not a "MUST DO" thing.

 

Yea. I agree that it is not a must thing, but I went with larger injectors as was recommended and now the car runs rich. A new prom will lean it out under normal aspiration and add more fuel in boost.

Got mine in an envelope as we speek!!!

 

holley makes the 255 pump cheap, i have one in my car...

 

Same pump as the Walbro 340. You should get a hot wire kit too to get 13.5 Volts to it.

 

Kenne Bell makes a boost-a-pump fuel voltage regulator that makes sure your fuel pump sees the right voltage that works quite well IMO...

 

I have been working with a PROM programmer from www.pcmforless.com

His name is Alvin and he is very familar with the programming of our 3rd gen cars. :hail:

He initially took the modifications information done on the car and sent me a first run prom. I provided him (through email) data using TTS software collected with my laptop. He then reprogrammed the prom file and sent it to me via email. I burned the program into the prom using pocket programmer II.

We went through this process about 6 times. But now I have a prom that gives the car perfect start up idle, very sensitive accelleration and incredible power at WOT!!!

I highly recommend his services. He is friendly and motivated.

We exchanged files this last weekend. He would take less than an hour to send me a new prom file from the time I sent the data.

Hope this helps other list members.

 

oh my *** 20 lbs of boost on a stock engine............lol.:lala:

listen to larry, he knows his procharger stuff!

your going to have so much money into that system....

cost me way into the 5 digits for my car to handle such an extreme amount........if you have the money by all means go for it; but it's alot and i mean alot of money.

good luck as the proper engine with that much boost is way to much for the street....:hail: