88iroczvert

I have an 88 iroc with a 355, brodix heads, slp cam, runners, exhaust and tremec tko with dual friction clutch. I wanted to upgrade to a larger mass air and wanted to know if anybody else has used the Lt1 sensor on a tpi. If so what did you need for the conversion.

89-WS6-GTA

I have a '94 MAF in my closet that i have experimented with. The problem with using a 4th gen MAF is tha the resistence along those 3 resistors inside is different set then the reisistors in our MAFs. So its would just send a set the SES light in your dash. If it wasn't for that it would be a matter of changing the ends on the maf sensor. On a side note if anyone is interested in a ported MAF off a '94 T/A send me some mail... Im going Speed Density.

Jim85IROC

The LT1 MAF outputs a completely non-compatible signal that the thirdgen computer has no chance of understanding. Nobody makes a converter.

But... Wells makes a MAF (part number SU-145) that uses the reliable film-type sensing system like the LT1 MAF, but is a drop-in replacement for the stock MAF. The Wells outflows every MAF on the market (it flows about the same as a de-screened, de-finned stock unit but without the reliability problems), has a lifetime warranty and also happens to be one of the lowest priced ones available. I've got one on my GTA and I'm perfectly happy with it.

87DJP2001

I second that on the WELL's Maf. Best replacement one out there.

rudy

As I recall, the old third gen MAF's used a analog output, but the newer Lt1 use a pulse width modulated signal, that is not compatible with the older PCM's. If you want bigger, you will have to go with a aftermarket made to fit piece.

irocbob89

Yeap, sorry dude. The lt-1 maf is not going to work. They also dont make an aftermarket maf for TPI cars. Your probably going to have to convert to Speed Density like i did and many other people have done.

BTW: witch slp cam do you have? I have one too, check the sig. Also with Brodix heads do you have? Do you like them? i was thinking of Brodix or AFR's and i was leaning towards the AFR's they seem to be cheaper and an almost certain to get intot the 11's. Thanks

Bobby

RobsWS6

What about a MAF Translator from Ramchargers? They make them for Turbo Buick's. Might give them a call to see if it'll work.

Jim85IROC

It won't work. They had dicussed making one for the TPI cars, but there just isn't enough demand.

Part of the problem is that flow is only 1 of the drawbacks to the TPI MAF system. The Wells MAF can flow well in excess of 750cfm, which is more than enough to support very high horsepower levels. The problem is that the computer can not accurately understand that much air. The MAF sends a signal from 0 to 255g/s. 0 is obviously no air, 255 is the max that the MAF can register. Because of this, the computer is only set up to recognize 0-255, so even if you had a MAF that produced higher numbers, the computer can't figure out what to do with the number. When you convert 255 g/s into cfm, it comes out to roughly 450 cfm. Pretty sad when you think about the fact that the TPI computer can only recognize up to 450cfm.

RobsWS6

That's just like mine in the TA. Only recognizes up to 255 and that was hit with just a air filter change! Even so, you can run 10's with it. Just takes some programming in the chip to compensate. I'm still on my orginal MAF and its doing just fine. I know of many Turbo Regals and TTA's in the low to mid 11s running the stock MAF, stock ECM, etc.

There are ways around it but the MAF Translator would be great if Bob decided to make it. Maybe start a letter writing campaign to let him know that there is a market for it.