First time Corvette owner technical question

V

Volkster1

New Member
Hello everyone. I recently purchased my first Corvette. It's a clean low mile 1989 roadster. I got it not running so the price was right. After many hours of diagnostic testing the issue has come down to the fuel injectors. The ohm's are way out of spec on 5 of 8. when I unplugged the worst of them it started up. It didn't run very well on 4 cylinders but it confirmed the issue. Iv'e been researching replacements and am finding conflicting information. My understanding is the stock injectors are 24lb hr and the ohm value is supposed to be between 15.2-15.8 +/-. My injectors tested between 6-16 ohm's. Iv'e seen many for sale claiming that 22lb is stock and others with 24lb as stock with ohm's guaranteed to 12. What are the correct injector rating and ohm's for a stock 89' vette? I wouldn't mind going a little bigger on the injector capability for any future modifications. It has a BBK throttle body and BBK exhaust installed by previous owner. Thank you for your help!
 
Id suggest the 24lb for a basically stock 350 TPI application

THESE LOOK STOCK (I'm using a similar 36 lb rated set in my 383 currently)
https://www.ebay.com/i/391440066276?chn=ps&dispItem=1

, if it takes you more than an hour or so to swap injectors out you need a great deal more practice
http://garage.grumpysperformance.com/index.php?threads/my-current-corvettes-383-combo.430/
trickf.jpg




trickf.jpg

THESE DON,T (I ordered these for my BBC swap)
https://fuelinjectorconnection.com/products/24lb-bosch-3-for-tpi
https://www.highflowfuel.com/i-2390...MIoLrr3KCN2gIVTbjACh2JdgspEAAYASAAEgKqbPD_BwE
https://www.texas-speed.com/p-3973-fic-80lb-bosch-injectors-for-ls-ev14-set-of-8.aspx


3973.png


either choice , of these would work
keep in mind the cpu will read the sensor data and modify the injector pulse duration,
to provide the engine with the intended fuel/air ratio, and the difference in the rated size is of zero concern as long as its properly tuned.
the rated size limits the upper flow rate but has almost no effect on mid and lower rpm flow.

https://www.corvetteactioncenter.co...il-removal-fuel-injector-replacement-827.html

http://garage.grumpysperformance.com/index.php?threads/diagnoseing-tpi-lt1-problems.1241/

http://garage.grumpysperformance.co...ive-are-the-stock-tpi-engine-components.1509/

http://garage.grumpysperformance.com/index.php?threads/c4-corvettes-fuel-system-info.67/#post-37351

http://forum.grumpysperformance.com/viewtopic.php?f=32&t=1401&p=8895&hilit=start+sequence#p8895

http://garage.grumpysperformance.co...ey-grumpy-do-i-need-bigger-injectors.5583/#po

http://garage.grumpysperformance.com/index.php?threads/calculate-fuel-injector-size.1200/#post-4041

http://garage.grumpysperformance.co...easonably-effective-tpi-combo.1060/#post-2031

http://garage.grumpysperformance.co...-other-efi-intake-manifold-info.431/#post-530

http://garage.grumpysperformance.com/index.php?threads/can-you-get-there-with-tpi.10494/#post-44299

http://garage.grumpysperformance.co...g-tpi-crossfire-or-lt1-vette.1401/#post-39419
 
Last edited:
I used the Trickflow 24 lb per hour injectors in my 1987 Corvette.
They are a perfect match.
Even the stock upper retainers are used.
Its a Disc Orfice type injector.
Vast improvement over a 1989-1996 Ball and seat injector.
They have been in my car since 2009.
Zero issues.

I had the other Grumpy shows.
I hated.
Belongs in LS engines & Ford 4.6 L V8.

Ford guys junk them....Buy Trickflows.
 
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