Sutol1

Hi Folks Sutuol1 is in the garage parked since november as it is freezing here in Toronto with lots of snow outside but I am getting the bug to get to work on it again and need a bit of help.

I would like to up the HP this year. I have a Moss MP62 running 6 psi but thought that perhaps 8 - 12 would make a difference. Here is what I would like your help with. Do you know what kind of power I would achieve at 8 10 and 12 psi all things remaining the same? I am not looking to hurt the car or excessive wear just more power that makes sense and easily achieved. Secondly what is the most effective way to do it? I know I need either a new ecu or piggyback but don't know that much about them. I do track the car and only drive it occassionally to work as I have two kids and don't find much time to drive a two seater. What do I need to buy and what will it give me I guess is the bottom line.

Thanks so much for your help.

One more thing if you have done this what is the car like to drive at north of 200HP.

Redcap

Since you have a 96 with a 99 head, your results may vary. But typically, you'd see just shy of 180 at 8, 200 at 10 and 220 at 12psi.

One thing that never gets mentioned about the MP62s is that they have a PSI delivery that is not expected. Typically, if you full throttle it, you'll hit about 7 or 8 PSI, and if you have a pulley that was supposed to provide more boost, you'll get those last bits of boost only towards the end of the RPM range. The power is very linear, but based on the most common understanding, you're not getting the full 12 psi, for example, right on throttle. This is probably a good thing, cause the car starts getting really twitchy with that much power from a stop.

The Moss MP62 is not limited by the SC, but by the available *hardware*. It is based on the 4-rib belt design that goes over the existing stock crank pulley. You'd really want to talk to Gary at TrackDogRacing.com. Moss doesn't make a smaller Nose pulley for the MP62, but Gary does.

http://www.trackdogracing.com/websit...es/pulleys.htm

However, I have used smaller nose pulleys in the past, and I would not go any smaller than 65mm. Once you get so small, the belt tends to lose it's grasp on the pulley and you get belt slip, never getting the PSI you intended.

The other option is th Crank Pulley Overlay. That is definitely an option, but it only comes in once size. After that, that's all the PSI you'll get. The 6-rib versions that are sold by SOT, FM and FFS provide a number of sizes to choose from. But I think it's quite pricey (and not sure if it's possible) to upgrade you kit to the 6-rib design.

Because of these limitations, your decision may already be made up for you. Personally, I think you should go for 8psi in 2009 and call it a day. Your PC-Pro and Timing Card should be able to handle that. Minimal fuss, minimal $ on you side hobby that doesn't get a lot of time, with very little concern for a new ECU, injectors, etc. You could probably get the crank pulley overlay and also run Water Injection to cool the charge and restore timing. At least on Track Days, this is probably good security.

8PSI is where the Miata is pretty happy with an SC. You'll get the whole shot of boost. I am at about 10, and I get the 8psi asap, the last 2 psi are a waiting game at the end of the RPM range.

Sutol1

Thank you for taking the time to respond. Very much appreciated. I like your thought process. Seems to get 220 to 240 the price goes up quite steply. I have talked alot with Gary but her hit a wall with mine as he has not really done any MP62 on an M1. Seems all of his customers are M2. I was waiting for him to FI his track car that is currently NA but he was waiting to finish his kitchen. Lol. So then if I get 9psi via a different four rib pulley I can still run same pc pro and ecu and injectors just have to increase full via the card and enjoy the ride? If this is so I would expect 190 rwh? I do have an intercooler currently.

Have i got that right?

Thanks again.

Redcap

If you have an IC already, that opens your options a lot. Once you start heading into 9+ psi territory, your next bottleneck may be fueling.

Your first limiting factor may become your Injectors and fuel pump. I'm not really familiar with NAs though. I know that there are some people using very slightly larger injectors with the PC-Pro, but it wasn't really programmed to handle that. Other people will upgrade their fuel pump to squeeze a little more output from their injectors. Once you start moving to bigger injectors, that is when the need for a new full ECU, or a better piggyback that can handle larger injectors is required.

There are a lot of guys running around with higher than 6psi and PC-Pros. If you want to stick with your PC-Pro for a while, then it'd be worth your time to visit the forum on FastForwardSuperchargers.com and ask a number of members there about their custom setups. Make sure you Dyno, at least to ensure that the IC can take care of any possible heat charge problems, if not you'll want to work on your Timing Card and reprogram it for the additional PSI.