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post #1 of (permalink) Old 05-20-2019, 02:45 AM Thread Starter
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mrgrim's Avatar
Join Date: Mar 2017
Location: Philly
Posts: 49
Car Year: 2005
Car Model: XT
Going too far with an FXT - advice?

I will do my best to keep it short,

2005 FXT low compression on one cylinder at 105,000 miles when I purchased the car. Have a motor built with all the fixins just shy of closed deck. Forged pistons, rods, STI crank, 1/2" ARP head studs, 272 cams with titanium springs and such in the full valve job. 1000cc injectors, 360 LPH fuel pump etc. Added a full front mount intercooler and a rotated Precision 5558 turbo. The down side is the car is a 4EAT auto trans car. On a Mustang dyno known as the heart breaker it did 359 hp. The shop that built the motor said 550hp was a safe number for the motor when it was built. They also said with the auto it would never get close to that. Fast forward 9 months and the trans is slipping and there is smoke from the tail pipe. I take the car to another shop and they say oil is getting past the seal in the 9 month old turbo and the trans is in its last days.

The solution is a 6 speed swap staying 5x100 and solve turbo issue. For 2 weeks I and the shop have been calling and emailing Precision with no reply to try and get an RMA to send in the turbo. So I am looking at going to a Garrett and chalking the precision up as a loss. My hope is to get the car to as close to 500hp as I can on 93 fuel as I do not have access to E85 near me. It will not be a dedicated track car but more a fun car on the street. The questions, What clutch? The shop wants to put in a stage 3 south bend drag clutch. What turbo? The shop wants to put in a Garrett GTX3076R 0.83 A/R. Is my dream of 500hp just that a dream? The car has all pipe work done and is setup for V band in and out so nothing stock is left under the hood or body. Even with the issues she would pull hard and the boost came on around 3700 RPM and was only at 19psi to try and keep trans alive. 25 to 30 psi is the plan after the trans swap and that has just started. As a side note on the dyno, the same day mine was run a new Nissan GTR was run and did 478hp as a point of reference.

Any one else gone too far that might have some advice?

05 FXT "Beater"
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