MAF or MAP for a S2 w 951 turbo

BoxsterGT · 12-11-2005, 02:57 AM

Any recommendations (pro or con) on using either a MAF system or a MAP system on my 944 S2 with a 951 head & turbo system?

I can go either way as the project is just being started. I have a complete, running hi miles S2 and a complete 944 turbo wreck from which to pull parts.

Thanks in advance for your advice.

Len

IanS · 12-11-2005, 10:37 PM

Vitesse appears to be the standard recommendation for a MAF kit. They have software for 2.8 and 3.0 liter engines as well. Lots of posts about them on Rennlist.

Pb_Foot951 · 12-12-2005, 09:14 AM

If I had to do it all over again, I would use a MAP system. It appears much easier to package. No need to re-circulate the BOV into the measured air flow. The possibility of an intake leak causing a lean condition can not happen. Newer technology.

BoxsterGT · 12-13-2005, 01:57 AM

Who makes a MAP conversion kit for this model?

Len

bleucamaro · 01-02-2006, 05:57 AM

Pretty much any stand-alone or Piggyback computer will accept a MAP sensor. I'm looking at running a MAP and an SMT6 or SMT7 on my supercharged S2 project.

SIR944 · 01-07-2006, 01:15 AM

Bar none MAP is best. As already said Motec, Haltech, Microtec, Link, AEM etc ALL use MAP. Its the best alternative out there, even more so for boosted cars. Link make a MAP specifically for our cars. Try www.NZEFI.com (for Link).

BoxsterGT · 01:28 AM

I definitely will go with a MAP system.

Does the Link system replace the Motronic ECU completely, or is it a piggyback?

I would like to keep the S2 Motronics if possible.

Thanks,

Len

AaronM · 01-07-2006, 09:55 AM

Quote:

Originally posted by Pb_Foot951
If I had to do it all over again, I would use a MAP system. It appears much easier to package. No need to re-circulate the BOV into the measured air flow. The possibility of an intake leak causing a lean condition can not happen. Newer technology.

MAP is newer? Wow, must've been out of this world when the 914 used it.

(I know, D-Jet is technically manifold _relative_ pressure, but I couldn't resist the joke.)

I still think I'd prefer to recirculate the BOV even with a MAP system though, it can't hurt and might actually help keep the turbo spooled a little more.

SIR944 · 01-07-2006, 11:36 AM

Quote:

Originally posted by BoxsterGT
I definitely will go with a MAP system.

Does the Link system replace the Motronic ECU completely, or is it a piggyback?

I would like to keep the S2 Motronics if possible.

Thanks,

Len

The Link system is a complete standalone, so it replaces the stock ECU. By the nature of standalones thats what they do

Keeping the stock ECU will limit your functionality greatly.

SIR944 · 01-07-2006, 11:38 AM

Quote:

Originally posted by AaronM
MAP is newer? Wow, must've been out of this world when the 914 used it.

(I know, D-Jet is technically manifold _relative_ pressure, but I couldn't resist the joke.)

I still think I'd prefer to recirculate the BOV even with a MAP system though, it can't hurt and might actually help keep the turbo spooled a little more.

The problem with recirculating is that the recirculating valves are smaller. If you need a very large one because of the boost running etc, then a lot of compressor surge will be experienced. otherwise

AaronM · 01-07-2006, 01:14 PM

Quote:

Originally posted by SIR944
The problem with recirculating is that the recirculating valves are smaller. If you need a very large one because of the boost running etc, then a lot of compressor surge will be experienced. otherwise

Interesting, I never knew that. Thanks for the information.

SIR944 · 01-07-2006, 01:15 PM

Yeah for example, the Tial BOV is 50mm.