Whats up?
I've recently figured out one of my major tpi issues! My car had some really bad idle problems. In neutral, I would rev the engine to 3000rpms! The computer would cut gas' the revs would fall to1100 rpms & then shoot back up to about 2500rpms drop to 500 & die!
My problem is the maf!!!! Today i had the car idling, & then it started to run really rough. So I tapped the maf sensor with my screwdriver , The idle smooth it self out completely!! When I tapped the maf a few more times the idle became really rough & the car died! My question is, can someone tell me the best place & price for a maf? In the near future I'm planning on switching the 305 for a 383-400ci motor, so the maf I purchase must be compatiable with the 305 motor that is currently in the car for now & also not so small where as it wont choke the new motor!!!!
thanx in advance
njdaewoo

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86 Tramaro 90% Trans Am/ 10% IROC/Z (nose, hood,& fenders)
Trans Am Mods as of 1/10/01
3inch
T.E.S/Flowmaster setup,gutted cat,gutted maf,relocated mat,373 gears,upgraded factory chip,255 liter h/press. walpro f/pump & throttle body coolant bypass
njdaewoo@excite.com

 

86,

I've had very good impressions of the Wells SU-145 MAF. It uses the same technology as the newer LT1/LS1 style sensors, with a thick film sensor instead of the hot wire, a flat metal honeycomb matrix in place of the round wire screens in the orignial (and aftermarket clone) units, and has no large internal heat sinks to impede air flow. It also has a larger inside diameter than the OEM sensor housings.

You can see some of the differences here:



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Later,
Vader
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"I'm'a do Things My Way - It's My way or the Highway."
Adobe Acrobat Reader

 

I am also looking into a new MAF, I have a 34 diagnostic code. Is the Wells SU-145 a direct bolt in (wire in) in place of the Bosch? So far I cannot find a local store that carries it. I have found a reman. by Cardone. Where would I find the MAF relay in the 1989 GTA 5.7? NAPA sells the relay for $12. Thought I would change both to cover all bases. Thanks for any info...
Richard

 

The MAF relay is on the driver's side firewall. There is a group of relays there. The others are for your fans. There is a pic around here that labels the relays but I couldnt find it while looking just now...

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Thanks for the info on the MAF relay, I will look for the labled picture. Please post if you happen across it as this site is quite large. Also, did the GTA come with a factory alarm system. I have a disconnected horn (siren) and motion detectors on driver side firewall. Thanks for the info...
Richard

 

World Discounts 800-288-6728 carries the Wells MAF with a lifetime warranty.



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Mike Metzler (Desert86Roc)
Mike@SpeedworldMotorplex.com
[*] Webmaster: SpeedWorldMotorplex.com[*] Click Here For My Racing Page[*]86 IROC 305 TPI (406 build in progress)
ET's @ 1250 ft[*] 14.28 @ 95.461 mph (uncorrected, NOS, no headers)[*] 15.365 @ 86.785 mph (uncorrected, Headers, no NOS)

 

I got just a stock replacement MAF from a local AC/Delco distributor for $330. TPIS has MAFs in there 2000 catalog that sell for $260 as a stock replacement, or as $300 modified.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

Soon to Come: 7.625" 10 Bolt with 3.42s and Accel TPI Intake Base

 

Ouch, $300 for a tube of air sounds steep to me.It doesn't even have a printed circuit board like the overpriced electronic controls I install. I did find a picture of the firewall relays. The Wells unit at $166 is sounding better all the time.
Richard

 

How much better does the Wells flow compared to the stock type?

If it flows better, seems like a good buy just for the improved airflow.

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1989 GTA Trans Am
Gunmetal Metallic, T-Tops
L98, 700R4, 3.27

 

The only thing I don't like about the Wells MAF is that unlike the Bosch MAF, it doesn't have the threaded inserts in the mounting points.
At least with my old Bosch, I could bolt it in to the hanger. Every time I mess with the Wells, it pops out of the rubber mount...

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89 Firebird Formula
WS6 package,ZZ4 Crate engine
SLP 58MM TB, Edelbrock TES Headers
Random Tech 3" cat, SLP 3" stainless exhaust
9 bolt rear, Hotchiss swing arms, Lakewood panhard rod
Corvette 2/4 servo, kevlar band, full poly rear.
Centerline 16x8 rims, B.F Goodrich drag radials

 

Brian Garrow at Wells Manufacturing doesn't quote flow numbers, but the Bosch unit is 70mm I.D. at the largest point, has two round wire screens, a large set of heat sink fins, and a sampling tube that hangs on a pair of mounting arms - all in the air stream. The Wells unit has a better flowing single flat metal matrix instead of the wire screens, a single circuit card 0.045" thick, and a tube I.D. that is 73mm at its smallest point, up to 78mm at the largest. What do you think would flow better. I know the Wells unit will do at least 690 SCFM, but that's as high as the Robertshaw flow tester would go reliably when I tested the two units.

Simply put, if a "gutted" Bosch MAF is suposed to flow 700SCFM, a larger Wells tube with less crap hanging in the air stream should flow better (and does - even with the metal matrix "screen" in the front opening).

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Later,
Vader
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"I'm'a do Things My Way - It's My way or the Highway."
Adobe Acrobat Reader

 

Granatelli Engineering is working on one for TPI cars now, and should have it out in the not-too-distant future.

Not sure if they're looking at Vette only or both Thirdgen and Vette.

In any case, could be a real plus for anyone with MAF.