Hi guys,

I know this kind of topic has been discussed before but I'm just going to ask anyway..

My motor's completely stock, never been opened with 68000km's (42253miles) on it,

My mods on my car so far is a down-pipe, mid-pipe, cat-back and an HKS intake and I'm planning on getting a bigger SMIC and the PowerFC..

What power figures could I be looking at after these mods and a tune?

Thanks, Luke

 

Hi Luke. Your car actually sound VERY similar to mine. I have 37,400 miles on the clock with a 3" exhaust from the turbo back. I also have intakes, stock mount Peter Ferral intercooler, and I just had my Power FC installed. The only difference is I have a larger fuel pump installed to keep up with the extra demand for fuel.

On Friday I dyno'd at 281whp on a fairly cool day. My stock injectors were at 90% duty cycle which is about all they'll handle. So that's probably all you'll see too. Maybe a little more if you don't have a cat in your midpipe (I have a high flow cat).

Your next step is going to be larger injectors. I'm going to get larger secondary injectors and a fuel rail since I have the larger fuel pump and will be able to feed them. I'm looking for close to 330whp once the boost comes up a bit.

 

I'm hardly an expert in the making power department but it seems to me that you should be able to make 300-350 rwhp on a healthy motor and stock turbos with proper tuning if everything else is working correctly. The PFC is going to be your biggest asset here, as it is the only future mod you have listed that will safely allow you to run higher boost. Keep in mind if you're on the original 20 year old motor and you start going for more power, you run the risk of having the replace that motor sooner than later. That just comes with the territory.

 

I don't think he has enough fuel behind him to make that power unless the dyno he's on reads quite high. He'll need larger injectors if he's going to keep from going lean.

 

Yeah, my information is not really backed up by real world data. I remember back in the old days of the M2 ECUs that the claim was "320 rwhp at 13 psi" with intake/SMIC/exhaust mods. I have a very similar setup to OP is proposing as well but I've never had my car on a dyno.

 

For the most part I've seen 12psi as being the maximum recommended boost pressure before doing any type of fuel system work. I'm sure you could push the envelope but longevity may be compromised. I'd rather be safe than stationary.

 

Free flowing your system + a tune at stock boost level should yield you anywhere between 250 RWHP-280RWHP. Your non ported engine will make difference. Once you start upping the boost the power level increases exponentially until you saturate the system due to heat. With the stock twins the most agreed number is 15 psi for saturation and longevity.


On a seperate note:
If you are still on a stock intercooler you are doing you car a BIG dis-service by going with the HKS HOT air intake. The stock IC is extremely inadequate as it heat soaks rather easily. So it doesn't make sense to add an intake that sucks in hot air. Now the only reason to add a hot air intake would be because there is a lack of space due to a large IC (or went single turbo). Which at that point the large IC's cooling capabilities render the hot air negligible. The best intake for this car is actually stock with Adam C's cheap bastard mod. As you see, the stock box is made of heat resistant materials that makes it less prone to heat soak (it has been proven). Unfortunately the stock intake doesn't play nice with non stock IC's (takes up too much room). So the next best intake(s) is an M2, rx7 fashion, rotary extrmeme, PFS style CAIs.


IMO get all your bolts on's in place i.e. CAI/IC/DP/MP/CB, get a boost controller and dial it in to 10 psi. Once everything is in order get a PFC and get it tuned to 12 psi (don't go past 12 on stock injectors) and happy motoring . At that point you will most likely be around 300RWHP-320RWHP. Tough to nail an exact number as several factors go into play when dealing with HP output. Dyno type, tune, engine porting (or lack of), engine compression, altitude, ambient temp all of those factors make a difference.

IMO once you have your car dialed at 12 psi and are tired of it then upgrade injectors, fuel pump, ignition amplifier, and go for a re-tune at a higher boost level. Don't go all out at once as it makes it much tougher to diagnose problems.


Also use the damned search function....

 

Make sure you have everything ducted well. a lot of people overlook this and this has a huge impact on cooling/lower air temps depending on your set up. don't forget the oil cooler(s).