I was looking through an old Corvette magazine in my basement and I came across a TPI buildup. They used a 4" Bosch MAF from a Porsche. Has anyone every heard of this? I don't know whether they used an aftermarket computer or not, but that would be very cool if it would work.

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89 Transam GTA, 350TPI, auto, 3.27 rear, dual cats, gray.
Magnaflow cat-back,
K&N open element,
Best E.T. 14.63@95mph

 

Tell us exactly what magazine and what issue (month and year).

Maybe we can get more info from the magazine guys??

If it works with stock electronics, I want one



------------------
Mike L.
It ain't pretty.......

1987 IROC Z TPI 350 A4 3.27 Borg-Warner.

Mods: 2300-2500 Stall Converter, Shift Kit(GM parts), TPI Specialties Stage 3 PROM, Modified Airbox w/ K&N's, homemade cold air, Relocated MAT sensor, Gutted MAF, 160* thermostat, Accel 8mm Wires, bypassed TB coolant, Flowmaster 3 chamber single 3" in/out muffler, 3" MAC mandrel intermediate, custom dual !cat Y-pipe. airfoil, ported plenum. !smog

http://www.MichaelLasiuta.home.att.net

**BOYCOTT LAPEER DRAGWAY**

 

I will get all the info I can when I go home tonight.

------------------
89 Transam GTA, 350TPI, auto, 3.27 rear, dual cats, gray.
Magnaflow cat-back,
K&N open element,
Best E.T. 14.63@95mph

 

SLP used to sell them about 10 years ago, along with a translator box.

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-Greg

'85 Trans Am - WS6,TPI:
Original owner, original paint/engine/interior, plus the usual bolt-ons

 

Wonder who made the translator


------------------
Mike L.
It ain't pretty.......

1987 IROC Z TPI 350 A4 3.27 Borg-Warner.

Mods: 2300-2500 Stall Converter, Shift Kit(GM parts), TPI Specialties Stage 3 PROM, Modified Airbox w/ K&N's, homemade cold air, Relocated MAT sensor, Gutted MAF, 160* thermostat, Accel 8mm Wires, bypassed TB coolant, Flowmaster 3 chamber single 3" in/out muffler, 3" MAC mandrel intermediate, custom dual !cat Y-pipe. airfoil, ported plenum. !smog

http://www.MichaelLasiuta.home.att.net

**BOYCOTT LAPEER DRAGWAY**

 

OK here's the info on the magazine.

Hot Rod "Hot'Vettes"
1/3/95
P.82/83

The engine was built by:
Stealth Engineering
Dept. HV
5312 W. 142 Pl.
Hawthorne, CA
90250
310-643-6112

The article didn't show many specs and was unclear about what computer system the setup used. It could have been a GM computer, or an aftermarket one.

------------------
89 Transam GTA, 350TPI, auto, 3.27 rear, dual cats, gray.
Magnaflow cat-back,
K&N open element,
Best E.T. 14.63@95mph

 

The down side is it's price.
There were wpme guys trying to get one to disect. But, at as I recall well over $400 a pop, they are expensive. Then you have to start from square one on the scalers, and tables, which is nothing to be taken lightly.
The application again as I recall was a early Porsche 928

 

Yea, my friend told me about that maf in 1986 and thats what he said it was off of.

 

It may not be very practical for most cases, but at least there is an option to the tiny MAF's that come in our cars. If you're running over 350hp and have skills in PROM buring, then it may be a good thing.

------------------
89 Transam GTA, 350TPI, auto, 3.27 rear, dual cats, gray.
Magnaflow cat-back,
K&N open element,
Best E.T. 14.63@95mph

 

I thought the actual computer can only react and calculate so much airflor regardless of the MAF size...i could be mistaken though...can someone clear that up?

------------------
Originating member of the SJNEP Crew
Vice President of the Jersey Fbody Crew(JFA)
Check out MyGTA Nicknamed:The Big Red Machine
***AOL IM RiceEatinGTA***
Moderator at www.transamgta.com
"What does not kill us only makes us stronger"

Tony

 

The MAF ecm also has the limitation of 255 gm/sec. The limitation is because the MAF system used a single 8 byte to define the various constants and tables to calculate the air flow (8 bytes only have 255 possible combinations).

There are ways to "cludge" the code of the eprom to make it work with a higher flow, but it involves knowledge of Assembly Language Programming and a copy of the source code (that can be created by disassembling the BIN).

The problem is that the MAF eprom is very tight for room and the math wihin the actual CPU has a very limited 16 bit instruction set. Because of all the problems and knowledge needed, people just end up going SD. When you get into eprom burning, you realize SD is very easy to work with (the VE tables can be calculated very easily if you capture information from a scan tool to show your BLM/INTs at various RPM/Loads). It is actually simpler than the MAF Scalar tables if you ever try to "tweak" those.

The MAF Scalar tables hit a "range of flows" so you have figure out how much to adjust the individual scalar table entry, but it hits a lot more things than just that particular "range" you are looking at. So you may get better BLM/INT on some circumstances but cause a problem in another if you are not careful.

 

Hey Grumpy, I bet you've got really hairy *****!!

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Yea .... but it's gonna to the big adios in a BLAZE a glory....
Director of Darwin Awards @ www.thirdgen.org

 

Now that wasn't very nice. Grumpy is one of the most intellegent and helpful people you could meet. That is why he was made a moderator on the DIY PROM Board.

If you REALLY wanted to make your car fast, Grumpy is probably one of the best people to speak to, especially in how to "burn a prom" for your car.

 

Uhhhh


If he did would you give him a haircut?

 

NO.

HEHEHEHEHE

 

Grumpy may be very intelligent and helpful, and I like his choice of cars, but it seems he has an attitude problem. Dude needs to lighten up.

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-Bill

-=1987 Buick Grand National=-
Almost Jacked Up Like a Mother

*CC 218/218 cam, ported and polished heads (1.77, 1.50), Accufab AFPR, custom 3" DP by Custom Tubes, dual 2.5" exhaust, Bilsteins, Walbro 307 hotwired, Big Mouth cold air intake, 009s (42.5# injectors), custom PROM and 20psi of fury*
SOON to have alcohol injection

Wanna try me?

-=ICON Motorsports=-

Modertor TPI board

 

I don't see this attitude problem. Grumpy has always been very helpful to me and lots of others. Maybe his sense of humor isn't the same as yours but if it was then we'd all like chinese food and women with flat chests. Not just Grumpy that needs to lighten up around here... Show a little respect people, he doesn't have to be here.

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Gutted cat
-!AIR
-Gutted Air Boxes

[This message has been edited by branz28 (edited July 12, 2001).]

 

EXCUSE ME!!!!!!!!!!!!!1
All of this trash about Grumpy and his "ATTITUDE" is a waste of time!!!!! Those of us that are here to share and learn from our experience with others, I for one am discouraged and dissapointed to say nothing of the disrespect shown for an honest effort to be helpful!!!!!!!!!
I have found this site and "ALL" of its moderators(and even SOME of the respondants) to be sincere and knowledgeable people, based on the consistant and helpful information they have been so "FREE" to share with us.
For those of you that aren't willing to take the time and MAYBE the $10 to $50 to buy a "shop manual" and "READ"???? (Heaven forbid)
you may have, MAYBE, something to contribute here instead of freeloading and bad mouthing those that sincerely try to be helpful.
Give it a try. You may even enjoy it.

 

I hope that comment of "freeloading" was not directed at me. If it was, someone needs to look up the word hypocrite. You say you respect all the moderators here, oh gee look, I'm a moderator and have been with this organization since the begining believe it or not. My comment was not without reason. I do admit that Grumpy is a very knowledgeable person and I'm sure has helped many people on this board as well as others, but I have seen many times an arrogant flair and a attitude which is not needed.

------------------
-Bill

-=1987 Buick Grand National=-
Almost Jacked Up Like a Mother

*CC 218/218 cam, ported and polished heads (1.77, 1.50), Accufab AFPR, custom 3" DP by Custom Tubes, dual 2.5" exhaust, Bilsteins, Walbro 307 hotwired, Big Mouth cold air intake, 009s (42.5# injectors), custom PROM and 20psi of fury*
SOON to have alcohol injection

Wanna try me?

-=ICON Motorsports=-

Modertor TPI board

 

I believe a few here miss understand grumpy and therefore take it to the worse situation when no harm is ment by the comment.

------------------
89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Gutted cat
-!AIR
-Gutted Air Boxes

 

You guys are wasting server space, get back to the subject please! Some of us freeloaders do like to read, however some of us do prefer the intelligent discussion of technical topics as apposed to infighting.

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"Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blind-folded fear."

-Thomas Jefferson

 

Back to topic....

In the newest carmagazine here in sweden they had an article in making a bigger MAF. They placed the sensor part of a bosch one in a bigger pipe made of al. and sealed it with silicone and just mounted it in the car! Is this possible?? obviously! The turbocars here in sweden is very fast!!!

/n.

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GTA -89:Free flow muffler,dual 3" HF cats, Edelbrock headers, Vette heads, 1.52 RR 7/16, ZZ-9 cam, Big Mouth, AS&M LTR, !plenum, 52 TB, MSD 6AL, TPIS level V prom, Superior shift-kit and all the minor mods, a Canfield headed 383 in the works!! ready May 2001...ok..june...july..and with Accel DFI....looking for SR or miniram....
http://www.itv.se/tacs/members_cars/m279/m279.html (Swedish Trans Am Club)