I bid on this MAF on e-bay at

http://cgi.ebay.com/ebaymotors/ws/eB...406622493&rd=1

I didn't realize that it said "TPI 87 Camaro 2.8 MAF Mass Airflow Sensor "

Im not the smartest man in the world, but I am confident that there did not exist a V6 TPI, and a 2.8L V8 would be sacreligious..

Anyway.. what good is this MAF to me ? Im assuming it wont work with my 350 TPI ?

 

Oddly enough..my friend has a 87 with a 2.8 in it. To the best of my knowledge its MPFI. Ive never SEEN at 2.8 TPI set up and doubt very much it exists.
Later..

Dan

 

Actually there was a TPI V6.....coolest thing I've ever seen, since I'm a TPI fan. It was factory, in a 1994? Bonneville SSE.

 

sorry..I forgot about the 3.8 motor.

Dan

 

The 2.8/3.1 V6 engines in the F-bodies running from early 1980's (1984 or 5 maybe????) to 1992 that were fuel injected (I think they all were but don't quote me on that) all utilized a basic multi-point system. The induction differences between these engines and the TPI V8 engines was the use of long, "tuned", runners designed to develop low to mid-range torque in the 305's. I am not really sure why this followed suit in the 350's but I know that it did (except the rare '91-92 Firehawks...they used something a bit different). Maybe $$$ was an issue??? After 1992, GM went to the 3800 V6 which does utilize a form of Tuned Port Injection, but I imagine the design is a bit different. To advise you on your situation, I would stay away from an ad like that, as I would wajor that the MAF in question may not work. Good luck with everything.

 

you people need to get your terms straight

MPFI=TPI
TPI=MPFI


TPI is a type of MPFI

just a slang name that was used to make it seem cooler

same things in the long run

 

Yep...TPI was the first generation in Port Injection.
LT1 was second. (On the Impala SS LT1, the cover says "Port Injection" as an FYI)
LS1 is third generation.

If fuel is injected behind the intake port, it's port injection. "Tuned Port", just signifys the use of tuned length runners as said above.
Sequential Fuel Injection, is port injection too in which each indv. injector fires at it's OWN specific time & not 'bank-to-bank' like others.

Ok, I'm done rambling...

 

well.. ok... what am I going to do with this MAF ?? Its for a 2.8 L, I have a 5.7 ... any hope of making them jive together ?

 

NO.





Seriously though, they do not interchange. Heck, just look at the connections, they are totally different too.

 

there is a 3.8 tpi though


thanks
anthony

 

I'd hope that every port injection is somewhat "tuned." It's just a name that GM thought would look good on badges, brochures, and throttle body plates. You could call an LS1 or LT1 "TPI" if you wanted, and I wouldn't argue.

 

I read on another post somewhere on this site (it might have been the forum right below the TPI forum) that the difference between the 2.8 MAF and the TPI Maf was that the 2.8's put out a digital signal, where the TPI MAF put out an Analog signal. Thus, the the MAF on my '88 SC won't work on my '89 Iroc. I think it was Vader that posted in the differences between the two in that artical. You might want to do a search if your still interested.

Joker

 

The Firehawks used the SLP T-Ram if anyone is curious. But yeah, the MPFI 2.8 technically is TPI, they just call it MPFI. Same good ol' batch fire system. If you want the skinny on anything MAF Vader is the source, but you just want to know whether the v6 and v8 MAF interchange then we can help you with that.....no.

 

MPFI = Multi Port fuel injection

TPI = Tuned port fuel injection.

Let me explain the differences between the 2.

MPFI if the V6 FI setup, the Injectors have a firing order like the timing firing order.

TPI is the V8 setup "duh" the reason why it's called Tuned port injection, is because of the tuned runners. TPI injectors run off of a batch fire setup, wich means that all of the left injectors will fire at the same time, then all of the right injectors will fire at the same time. You can unplug all of the injectors on the drivers side, then re plug the plugs in a random order and the car will run fine, because all of the injector plug wires become one big wire down the line.

aside from that TPI and MPFI are practically the same.

But anyways, yea it won't work.

 

.

 

Isn't that SFI? I thought MPFI was batch fire just like TPI? The names basically explain everything. MPFI - fuel being injected into intake ports (rather than throttle body). TPI - verison of MPFI with "tuned" runners. SFI - what 5SIZ described above, the injectors firing sequaentially with the spark plugs (hence Sequential Fuel Injection). Same thing with the caddy PFI (Port Fuel Injection...the name says it all....yup you guess it....nothing but MPFI.