GT40P Dyno Results

[Two86fiveoh's]

Dyno'd my 86GT this morning, made 276/318 to the tires.

Combo:
98' Explorer Motor, 170k miles on it. Heads have never been pulled.
Stock Mustang cam, installed straight up. 1.7 Crane RR's
Explorer lower intake, ported by me. GT40 Tubular upper w/70mm Accufab
Stock air box w/K&N
FRPP Shorties, O/R H-pipe, Flowmaster Catback
Underdrive pullies w/electric fan
30lb injectors and 190lph Fuel pump

Edit--Total timing is 28.5 degrees at WOT.

[Two86fiveoh's]

Stinger Performance PimpXS ECU tuned by me.

[mcb82gt]

what springs you running on the heads?

Impressive results, im jealous. I have a set of 40P's sitting on my floor.

[Two86fiveoh's]

Tfs-2500100

[86MustangGtRob]

Great dyno results!! Which 30lb injectors did you use?

[ZephyrEFI]

Your setup is a LOT like mine. Except I have 1.6 rockers, Explorer upper, and 24 lb injectors.

[Two86fiveoh's]

Great dyno results!! Which 30lb injectors did you use?

Rebuilt EV6 Bosch injectors.

This was intended to be a baseline pull before winter mods (AFR165's and custom cam), but I'm second guessing swapping the heads even though I already own a set of new AFR's.

It's tempting to keep the current heads and cam and see how close I can get to 300rwhp with stock untouched 'P' heads and stock cam. I don't forsee hitting the magic 300 mark, but how close can I get?

[RoelandVerhoeven]

Hello!
276/318 to the tires is a respectable power level for your combination, especially considering the high mileage on the engine. It's worth noting that the combination of the stock Mustang cam, 1.7 Crane rockers, and ported Explorer lower intake likely contributed to the power gains you're seeing. The increased valve lift and duration from the rocker arms and the improved airflow from the ported lower intake can help the engine breathe better and produce more power.
Additionally, the GT40 tubular upper intake and 70mm Accufab throttle body likely helped increase airflow and power as well.

[mcb82gt]

T5 I assume?

[RoelandVerhoeven]

Exactly

[Two86fiveoh's]

T5 I assume?

Yessir, T5. 3.27 gears. Pulls were made in 4th gear.

[Bryan Knebworth]

Yessir, T5. 3.27 gears. Pulls were made in 4th gear.

Do you know if the car was originally an Automatic? I've never heard of a Third Gen with a stick and 3.27 gears, stick cars always had either 3.08, or 2.73 in later years. Great pull though

[Two86fiveoh's]

Thanks!

Originally a 5spd and 2.73's. I swapped to 3.27's and 31 spline over 10 years ago.

Didn't install the AFR's/FTI cam this winter. Making a few subtle tweaks this year, hoping to hit 285/320. Still with stock cam and untouched 'P' heads. Will be using the same dyno.

[emerygt350]

So jealous. My GT40 3bars and my truck grind cam made 300 torque, but only maybe 220-230 HP (estimated flywheel). 180 HP at the wheels. I need to take it back to the Dyno though. Been a while and it is running real good these days.

[Two86fiveoh's]

Did a fair amount of tuning the last couple weeks. Made some notable improvement throughout, fairly significant in the 5+rpm area. Added another degree of timing and decided to keep the DIY intake I mocked up this winter. The new Motorcraft coil helped tremendously with idle quality and upper rpm power.

The pulls last year were made with the stock 86' 302,000 mile coil.

[tspangle]

Very impressive numbers. I had a similar setup in the 89 LX I had many years ago. GT40P heads, stock Mustang cam, 1.7 rockers, Explorer intake, and 65mm throttle body, and my car made 256 at the wheels. I don't remember the torque, it was almost 20 years ago.