Lex AFM VS VPC

[MKIIITrbo89]

Just wondering what the main differences are between these two mods in elminating fuel cut. I know the AFM tricks the fuel computer and the VPC deals with speed density(although not sure what that means). Is there a difference in power gains to be achieved using the two modifications. I realized the AFM is the much cheaper route.

 

[lagged]

lex AFM dosnt eliminate fuel cut.

IMO, eliminating fuel cut is a BAD thing.

 

[MKIIITrbo89]

Yea I guess I realized that. What I meant was don't people either go with one or the other, either VPC, or the lex afm. If so is there a benefit of one over the other.

 

[Kyle87T]

the VPC eliminates that unsightly lump of metal b/w the accordian pipe and air filter. (AFM) You can run a nice straight intake pipe.

 

[MKIIITrbo89]

I see, just thought there was some major benefit of the VPC, since its so damn expensive....guess not.

 

[mkIIIman089]

Its expensive and very out dated.

If you wanted to do something like speed density (which is a good idea if you're willing to set it up properly) the MAFT Pro is the only worth while solution.

 

[Reign_Maker]

Yeah, there IS a major benefit to having a VPC... A few benefits...
1: you can run ANY turbo you want using a vpc..
2: its cake to tune with...
3: if you up your fuel pressure, you can control the idle a/f ratio with the turn of one knob to settle down and flooding that might occur with the higher base fuel... Why would you need higher base fuel? To run more boost...
4: The vpc can be mapped for you specific injector size, allowing you to maximize the efficiency of your injectors...
5: ok, look, go to www.hksusa.com and read about the VPC...

As for the LexAFM, it flows about 25% more air than the stock AFM, so there for you can run higher boost... However, you need more fuel and a larger pump to help it flow, then of course you should get an AFPR and a fuel pressure gauge... The LexAFM does NOT stop fuel cut, it just raises it... I dunno the exact number... The VPC, well, I can tell you that I've hit 30+psi with my vpc and I WISH it hit fuel cut...

Good luck...

 

[Reign_Maker]

Its expensive and very out dated.

If you wanted to do something like speed density (which is a good idea if you're willing to set it up properly) the MAFT Pro is the only worth while solution.

It might be out dated, but its effective, efficient, and it works... Not to mention, its simple... And its not really THAT out dated... Jeez... :aigo:

And with all the options, I wouldnt say the "ONLY" worth while solution is maft pro...

 

[MKIIITrbo89]

Ya, I did realize the Lex AFM, just raised the fuel cut, I have it on my car with 550s, just wrote the wrong thing. But as far as tuning goes, with fuel computers and things of that nature, I really don't know much. Which is why I was asking about the VPC, and didnt realize it was totally different from the AFM. Thanks for the info Rain, it helped clear things up. I read they don't make the VPC anymore. As far as the MAFT Pro, I don't know what that is, I'll have to read up on it.

Eventually, I am looking to make around 500hp. Is a MAFT, or VPC needed to do this(or how necessary is it to have either of them). Besides an AFC, are these just used with it for more fine tuning.

Also from what I have read, the VPC or MAFT replace the Lex AFM?

Thanks for the help, sorry if these seem like dumb questions

 

[Red '88T]

with vpc you can vent your bov to atm with no more backfires.

 

[tubbie]

with vpc you can vent your bov to atm with no more backfires.

I changed to a vpc..... I miss the backfires, especially at night....

 

[supralover2000]

Here is the link www.mafpro.com There are links on that page about what speed density is and how the unit works.
As for the Lexus AFM/550cc injector setup, it works great but personally I have had to use an additional controller (HKS S-AFR) to fine tune the car. The same would apply to the HKS VPC. You will be required to incorporate a second tuning device to fine tune. Most use the old combination of the VPC and GCC (both HKS) while some used VPC + SAFC or VPC +SAFR. The advantages of the MAFTPRO are in its tunability and compact size (when compared to the bulk of the vpc setup). Essentially with the MAFTPRO you are getting a vpc+SAFC+boost controller all wrapped up into one device. HTH