DamonSlowpokeBaumann said:
You can actually hurt performance using this kit without having your car properly tuned. SO to bolt on this kit and go really isnt where the gains are comming from.
I think the main questions are how does the MAF voltage know what boost we are at?(It doesnt correct?) And why is using the MAF voltage better then using boost for reference.
Grand nationals have been successufully using boost to activate thier methanol systems for years and a basic methanol type system such as the snow can be built at home. Even the Maf applied switch can be easily duplicated. So what are the real advantages to this kit? It aint cheap
The advantage of this kit lies in the fact that we can achieve full boost at 2000rpm, but we can't handle full spray at that rpm. This is what Todd Jelle found with his older system. They tuned his on the dyno at Coy's and got a good HP gain from it. However, on the car and at the track it caused the car to bog badly off the line. Then if you have an adjustable system like the SMC system which is very popular with the GN guys, you can turn it down, but then you don't have enough at high rpm.
This system looks only at airflow and starts the spray of 50% at whatever MAF voltage you pick, and then ramps up to 100% spray at another MAF point which you also pick. So, bottom line is that it a) doesn't know what boost you are at, and b) doesn't care what boost you are at.
If you log MAF voltages you would realize that while MAF readings are not directly tied to boost, but rather it is a function of rpm and boost together. You will not reach a high enough MAF value to trigger the system unless you are under plenty of load to warrant the use of a/w. The system targets a certain % of total airflow so you never end up with too much. That is the key.
As for price, I think that if you sourced the SS nozzles, 160psi pump, solenoid, and parts you will find that you won't do it for a whole lot less than their base kit, but then you would still have to figure out how to ramp up pump pressure as a function of MAF voltage. Not the easiest thing in the world for the average SC owner.
As with any product, if only we had the time etc, etc., we could do darn near anything ourselves. Problem is we'd get old and die before we ever finished anything. When I consider how much time and money we have spent on other things for our cars, this is such a bargain that it is ridiculous.
I absolutely feel that this kit provides an EXCELLENT upgrade with no tuning required.
1) Most SC's are lean after some mods. This can only be helped with added fuel and higher octane.
2) Most SC's with some mods make more boost than stock which means they already have too much timing. Some processors have as much as 29 deg base timing. My first pull with my car was with 23 deg timing and I ended up with 30 deg. Not far at all above stock!
3) Most all SC's are pulling timing on the top end due to excessive ACT's (this kit will drop them about 20-40 deg!)
4) Dyno testing has shown that almost all SC's with any modifications are experiencing detonation. Did I mention 120 octane?
The fact is that I did not lean out the car when I did testing. All I did was increase timing 2 deg over stock. My car saw 11.5 AF WITH the a/w injection, 11.8-12.0 without it. I could have leaned it out a whole point to 12.5 and possibly picked up more HP. I also could have used a 50/50 mix of methanol and water instead of just WW fluid....
I think even more gains will be had than what I have shown so far. I have been very conservative with my testing (as usual btw).