I have an 86 Iroc w/ a built 350 TPI and I am getting ready to add an ATI Procharger. My car already has a custom chip, so if I get the MSD boost retard box will my chip need reburned?? Also since the ATI comes w/ and Adjustable FMU will I still need bigger injectors?? Any other mods I will need to do??? Thanks

 

follow the instructions, they say "remove aftermarket chips and or programming before installing supercharger"

 

I have an 86 Iroc w/ a built 350 TPI and I am getting ready to add an ATI Procharger.

First things first. Are you aware that you'll have to convert your v-belt system over to the 1988-92 serpentine system? That means not only the brackets, but all the accessories (possibly not the air pump).

My car already has a custom chip, so if I get the MSD boost retard box will my chip need reburned??

Two issues here. First, the EPROM. A custom EPROM usually incorporates a more aggressive timing curve. This is absolutely okay with a supercharger. The concern is total timing. Normally with a blown engine, you need to limit total timing. So to answer your question whether you can use a custom EPROM, you'll need to find out how much timing is designed into it. To do this, contact the manufacturer or better yet, hook up a scanner and read the timing advance spec at WOT.

Secondly, you most likely won't need to retard total timing with a boost retard module. Timing retard is only necessary to prevent detonation which is more prone to occur on a blown engine because of high air temperatures that are introduced into the engine due to the compression of the air (by the blower). The intercooler greatly reduces the air temperature -- enough to avoid having to retard timing.

Retarding timing ALWAYS results in lost power. So if you don't need to, why do it? Personally, I have the ATI three-core intercooler and I also use water/alcohol injection. At 12-psig boost, my inlet air temperature (in the plenum) is no greater than 120 degrees. For comparison, the supercharger outlet temperature before the intercooler and before water is 200 degrees. If this 200-degree were not cooled down, detonation would be a major problem and timing retard would be necessary.


Also since the ATI comes w/ and Adjustable FMU will I still need bigger injectors?? Any other mods I will need to do???

Possibly not. An FMU is by far the cheapest and non-friendly method to enrichen the air/fuel ratio under boost. Personally, I do not use it. I use the Carroll Superfueler instead. But if you decide to use the FMU, the only way to determine if larger injectors are needed are to examine your O2 sensor voltage at WOT. I like to see values between 850mV to 950mV. The way to do this is again, with a scanner. If your millivoltage is too low, you'll need larger injectors.

 

Willie thanks for all the help. I was also concerned about the v-belt to serp. belt problem. I asked the man who is doing the supercharger install, and he is an ATI dealer who installs them daily. I asked him about it and he said I wouldn't have to convert to serpentine and making it work on my V-belt setup isn't a big deal. This doesn't make sense to me, do you think there is anyway for this to be done??? Thanks again for all the help..

 

Glad I could help. I've never heard of installing a ProCharger kit designed for a serpentine system onto a v-belt system. If your guy can do it, all the more power!!! I'd love to see how it's done because the ATI bracket bolts to the driver's side head where your A/C compressor is now. Also, with the v-belts, I do not think there's enough room for a blower belt, especially the 12-rib. Keep us informed.

Willie