Is there anything available that enables the MAF sensor to be replaced with a MAP sensor.
As I understand it a combination of a pressure sensor in the inlet manifold and the engine revs can be used to determine the air flow.
With a MAP based system it would be possible to increase the speed of my vortech SC and vent it off using a BOV to maintain a pre set boost level. I would be happy to sacrifice some additional parasitic losses at high revs for the added boost at lower revs. Heat shouldn't be a problem as I'm planning to fit a cooler of some type.
Any ideas?
There are "black boxes" out there which will output an HFM signal based on TPS & MAP. The problem, though, is that not all HFM signals are the same... so no matter what you're going to have to redo your maps...
Trust me, it's not worth the money.... it's expensive
Boris
HKS VPC is what you're looking for. I can't tell you though if that's application specific or generic. I only know that HKS has chips for different size injectors that come with VPC and those are only for certain cars. I think that VPC itself would work as long as you already have a chip for injectors you are running.
VPC = DiscontinuedOriginally posted by dom
HKS VPC is what you're looking for. I can't tell you though if that's application specific or generic. I only know that HKS has chips for different size injectors that come with VPC and those are only for certain cars. I think that VPC itself would work as long as you already have a chip for injectors you are running.
Yeah the vpc is no more, but dont change from the maf. The maf offers easier tunability when you make changes to the engine. Maf too restictive? buy a bigger one. problem solved.
Buy me Boost!
You can still find VPC on part traders or ebay. With AEM EMS being the rave a lot of those go up for sale.
You can also get a Pro-M maf http://www.pro-flow.com/Import/import%20front.htm
I already thought of and looked into this theory.Originally posted by 328iSC
With a MAP based system it would be possible to increase the speed of my vortech SC and vent it off using a BOV to maintain a pre set boost level. I would be happy to sacrifice some additional parasitic losses at high revs for the added boost at lower revs. Heat shouldn't be a problem as I'm planning to fit a cooler of some type.
Any ideas?
Its not worth the effort. You'll be pushing TONS of heat on the upper end, but since you are venting off some boost, you will be losing power. Same boost level + more heat= less power.
Also, you will only be gaining maybe 1psi in the midrange. Vortech superchargers just don't make much boost til you get into the upper RPM's.
And a BOV isn't going to do that job. You'll need a wastegate that is adapted to work on the intake side of the motor.
How do you vent boost? When do you lose power?? What do you mean?? And what heat in the upper end?Originally posted by Spencer
I already thought of and looked into this theory.
Its not worth the effort. You'll be pushing TONS of heat on the upper end, but since you are venting off some boost, you will be losing power. Same boost level + more heat= less power.
Why would you gain 1psi??Originally posted by Spencer
Also, you will only be gaining maybe 1psi in the midrange. Vortech superchargers just don't make much boost til you get into the upper RPM's.
I think you're misunderstanding something. A wastegate controls turbo spool, it has nothing to do with intake. A BOV will actually do the job, but besides getting a "PSSSSHHHTT" you get nothing by getting a BOV instead of a BPV.Originally posted by Spencer
And a BOV isn't going to do that job. You'll need a wastegate that is adapted to work on the intake side of the motor.
As I originally stated, this is a waste of money waste of time mod!
Boris
BOV needs vacuum to open. Wastegate needs pressure. When Blower is pushing air you need waste gate to vent it and you will need electronic boost controller.
Boris,
Read the original post again....
To me, this quote means.......With a MAP based system it would be possible to increase the speed of my vortech SC and vent it off using a BOV to maintain a pre set boost level. I would be happy to sacrifice some additional parasitic losses at high revs for the added boost at lower revs. Heat shouldn't be a problem as I'm planning to fit a cooler of some type.
Lets say he has 8psi of boost now. What he wants to do is put a pulley for 11psi (or something more than what he's got now) on there, and then use the BOV to vent that added boost on the upper end. This would keep the boost at 8psi but it would give the "midrange" boost of the 11psi pulley. So basically he wants to spin the blower faster in the lower/midrange to get more boost in that area, and then vent the upper end to keep the max boost where it already is. This in theory would strengthen the midrange.
Thats what I interpreted this quote as....... maybe I'm way off.
And yes, I know a wastegate is not involved with the intake side of a turbo system like that. Thats why I said "an adapted wastegate" meaning something that could bleed boost over his target max boost.
And my comment to gaining 1 psi in the midrange means that with that 11psi pulley, you are gaining most of the boost on the upper end, not the midrange, where he wants a gain.
I think we are a different page here.
Thanks for the feedback and you are probably right. It may be more hassle and money than it is worth but I'll carry on looking into it some more. It's all good!
I've made a bit of a spreadsheet to predict what happens with various pulley ratios, with and without intercooling over the full rev range. The figures I am getting look pretty good. But I'm not too sure I'm modelling the output from the SC yet, but it's not too far wrong.
What do you think is a safe boost to run in a 2.8L M52 with vortech V2 with 10.2CR running on 98RON, UK superunleaded. I'm planning a fairly big intercooler and think I can fit the necessary pipes. I might also go for the aquamist kit. They have a system that sprays from the injector pulse, so you can accurately set the water/fuel ratio.
What is the CR of the US stock M3 motor?
With an 80% efficient cooler with 10% pressure drop you are still seeing a reasonable gain even though there is less boost. If the boost is bumped up which is reasonable considering the lower inlet temps then the gains are pretty good.
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