Took my car over to Accelerated Performance in Toledo Oh yesterday to do some tuning on their Dynojet to get car ready for its first trip to drag strip this year.





It has a rebuilt 97 Explorer GT40P motor with all stock internals.The heads got a valve spring upgrade but are otherwise untouched, has stock intakes and throttlebody. I put in a TFS stage 1 cam,bolted on some BBK 1-3/4 long tube headers and slapped on a Vortech S trim blower with stock 8lb pulleys as the only engine mods. I am using 38lb injectors and it all runs on a plug n play Microsquirt from EFI Source. Something worth noting is I built the car with a 2.5" Y-pipe going into a SINGLE 3" exhaust from Stinger Performance designed for 2.3t Turbocoupes.

First pull off the street the car only made 322hp/347tq with my own tune but we only seen about 5psi up to about 5000rpm then belt slip dropped it down to 3psi. It obviously peaked at 5000 just before the belt started slipping. The power on the graph dropped off a cliff after 5k.
https://www.youtube.com/watch?v=lK9ZlOrciio

We made some adjustments to fuel and timing and threw on my 10lb pulley to see what would happen after about 4 other pulls. This only caused worse belt slip and we only seen 6psi at 5000 then fell off hard after that. It made 344/344
https://www.youtube.com/watch?v=p76lptC58hU

I took the 10lb pulley off and beadblasted it to give it some teeth which helped for the last few pulls but it still slipped after 5200. Like this we seen 9psi up to 5200 then it slipped to 6psi for rest of the pull. Like this it peaked at 5200 and made 370/393
https://www.youtube.com/watch?v=92yYQOFKp9M

At this point we called it a day after 10 pulls. Pretty happy with results and I learned some good info. At final power levels my injectors are only at 80% duty cycle so there is still plenty of fuel left to break the 400hp mark. We seen air temps of 200* on every pull and heat correction was pulling total timing down to 16*. I need to move the sensor out of the lower intake and put in discharge tube of the blower for a true{non heat soaked} reading. Then I need to move the air filter out of the engine bay and put inside the fender for cooler air. These mods should help lower the inlet temps and help us dial back in some timing. Then there is the belt slip....Im going to beadblast the lower pulley and bought an adjustable belt tensioner to try next. Tuner thinks if we could get a solid 10psi for the whole pull up to 6000-6200 with lower air temps it should make an easy 420-440 depending on how much timing we can add back in.