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Description
The FiTech Ultimate LS3/L92 750HP Fuel Injection System with Transmission Controller is a high-output, standalone self-tuning induction and drivetrain management package designed specifically for rectangular-port GM LS-series V8 engines. Combining a fabricated aluminum intake manifold, high-flow throttle body, billet fuel rails, 750HP high-capacity fuel injectors, a self-learning ECU, and integrated electronic GM transmission control, it delivers a total induction and transmission control solution for high-horsepower street rods, restomods, and performance engine swaps.
System Architecture & Performance Highlights
Integrated Electronic Transmission Control: Features built-in electronic control for GM 4L60E, 4L65E, 4L70E, and 4L80E automatic transmissions, eliminating the need for a standalone transmission controller. Shift points, shift firmness, and torque converter clutch (TCC) lockup are adjusted directly via the handheld touchscreen.
Rectangular-Port Cylinder Head Alignment: Formed with intake runner ports designed specifically to mate cleanly with GM LS3, L92, L99, L76, and L77 cylinder head port profiles.
750HP High-Flow Injector Package: Equipped with higher-capacity fuel injectors specifically calibrated to supply adequate fuel volume for high-output, naturally aspirated or modified LS engines producing up to 750 horsepower.
Complete Self-Tuning ECU: Utilizes a self-learning ECU that automatically creates and refines air/fuel maps based on real-time wideband oxygen sensor feedback, eliminating the need for laptop tuning or factory ECU re-flashing.
Fabricated Aluminum Intake Assembly: Includes a durable, high-flow black anodized fabricated aluminum intake manifold complete with matching billet fuel rails and a high-flow drive-by-cable throttle body.
Plug-and-Play Engine & Trans Wiring: Fully labeled automotive-grade wiring harnesses for both engine sensors and GM transmission solenoids eliminate harness cutting, splicing, or factory ECU modifications.
Touchscreen Handheld Controller: Includes a color touchscreen controller for initial setup parameters (engine displacement, camshaft profile, idle set points, tire size, gear ratios) and real-time sensor monitoring.
Self-Learning ECU with Color Touchscreen Handheld Controller (Engine & Transmission Parameters)
Installation & Compatibility Notes
Port Shape Verification: Confirm cylinder heads feature rectangular intake ports (LS3/L92 style); this intake manifold will not seal on early cathedral-port heads (LS1/LS6/LS2/LM7) or LS7 square/raised-rectangular ports.
Fuel System Requirements: Requires an EFI-grade high-pressure fuel delivery system operating at 58 PSI capable of supporting 750 HP demand (e.g., high-output in-tank fuel module or dual external pump setup).
Transmission Wiring & Setup: Connect the dedicated transmission harness directly to the main 13-pin connector on the 4L60E/4L80E case and input tire diameter, rear axle ratio, and shift preferences using the handheld touchscreen before test-driving.
Oxygen Sensor Placement: Weld the included wideband O2 sensor bung into the exhaust header or collector pipe at least 18 inches downstream of the exhaust ports and upstream of any catalytic converters.
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Refund Policy
We offer a 30-day return policy, which means you have 30 days from the date you receive your item to request a return.
Eligibility for Returns
To be eligible for a return, your item must be:
In the same condition as received
Unworn or unused
With original tags attached
In its original packaging
You must also provide a receipt or proof of purchase.
How to Start a Return
To initiate a return, please contact us at jonathon@hotrodhardware.com. Once your return request is approved, you will be provided with the return address and, if applicable, an RMA (Return Merchandise Authorization) number.
Important: Items sent back without prior authorization will not be accepted.
If you have any questions regarding your return, feel free to contact us at the email above.
Damages and Issues
Please inspect your order upon delivery. If your item is defective, damaged, or if you received the wrong item, contact us immediately so we can evaluate the issue and resolve it promptly.
Exceptions / Non-Returnable Items
The following items are not eligible for return:
Custom or personalized products (including special orders)
Hazardous materials, flammable liquids, or gases
Sale items
Gift cards
If you are unsure whether your item qualifies, please contact us before initiating a return.
Exchanges
The fastest way to receive a replacement item is to return your original item (once approved) and place a new order separately.
Free Shipping Orders
Orders that qualified for free shipping are subject to deduction of the original outbound shipping cost if the item is returned.
Refunds
Once your return is received and inspected, we will notify you regarding the approval status of your refund.
If approved:
Refunds will be issued to your original payment method
Any applicable restocking fees will be deducted
Original shipping charges (if applicable) will be deducted
Return shipping costs (if arranged by Hot Rod Hardware) will be deducted
Please note:
Payment processing fees (including PayPal, Amazon Pay, or other merchant fees) are non-refundable
It may take additional time for your bank or credit card provider to process and post the refund
