Prodigy Performance 3.6 Turbo DIY Install

[NOLAjeeper]

I may have shot flames out of my exhaust

After a full throttle acceleration in 1st and 2nd gear, I quickly let off the throttle and shift into neutral (with the intention to shift into 6th gear as soon as the engine speed comes down) around 50mph, because I'm on a public road and want to avoid speeding. A split second afterward, I hear a significant muffled "pop" come from behind/below the jeep.

This has happened a few times recently. My wife heard it the other day and also immediately wondered if I had just shot flames out the tailpipe.

Has anyone else experienced this?

I wonder if this is an indication that the tune is a bit too rich?

I might have to stick my GoPro on the back of the jeep and attempt to re-create this situation at night.

Happens to me every time i go full throttle, pedal to the floor and then let off. I hear that loud ass POP from the exhaust!

[jeepsking]

Happens to me every time i go full throttle, pedal to the floor and then let off. I hear that loud ass POP from the exhaust!

It happens to me also. Jeff please try this. Put the gear in second and at 1500 rpm press full throttle. Tell me what happens before it reach 2500.

I promised Dan to shoot a video but didn't have a chance.


By the way i don't know why i received a short elbow pipe which is between the intercooler and the turbo, seems like the gave me an extension pipe to add, but when i saw Jeff close setup then realised that i got it wrong. Now every time i boost on hills the pipe comes out.

[UselessPickles]

Put the gear in second and at 1500 rpm press full throttle. Tell me what happens before it reach 2500.

If I try that today, I'll probably crash because it's snowing here

When I recently recorded a data log to make the boost curve chart, that was full throttle in second gear from about 1500 rpm. I don't remember anything particularly bad happening, other than just generally not accelerating very quickly until after 2500 rpm.

It's been so long since I've driven with a stock engine that I can't tell whether it's slower, faster, or the same as stock in the low rpm range. Part of the sluggish feeling is likely due to relative comparison to how hard it accelerates above 2500 rpm, but I think there's still some issues with the tune in that area as well.

My data logs still show long-term fuel trims suddenly going extremely negative at 1500 rpm, then suddenly returning to more "normal" values around 2600 rpm. When accelerating lightly/moderately in 1st gear, especially with a cold engine, I feel a sudden decrease in power as I pass 1500 rpm, then a sudden jerk and surge in power right around 2600-2800 rpm. The severity varies with the amount of throttle I'm using, and the problem becomes fairly subtle when the engine is fully warmed up. The relationship between the long-term fuel trims and the acceleration behavior seems to close to be coincidence, and seems to me to indicate a problem with the tune. If tuned properly, the computer should not have to take away 20+% fuel in the 1500-2600 rpm range.

Have you gotten a custom tune from Prodigy yet?

By the way i don't know why i received a short elbow pipe which is between the intercooler and the turbo, seems like the gave me an extension pipe to add, but when i saw Jeff close setup then realised that i got it wrong. Now every time i boost on hills the pipe comes out.

The longer 1-piece silicone elbow that I have is a newer part that Prodigy now has custom ordered for the stage 2 kit. The shorter elbow that you have is a "standard" size (easy for Prodigy to obtain) that they used at first before getting the custom size. The shorter version requires a short metal pipe to be used as a coupler to attach a short extension of silicone hose to reach the turbo. You'll end up with 3 hose clamps in a row, right next to each other to connect the turbo, extension, coupler and elbow all together.

There's not much room for error, so you just need to get the coupler perfectly centered between the elbow and extension, get the hose clamps lined up perfectly and make sure all the hose clamps are tight. You also might need to double-check the angle of the compressor housing outlet compared to the angle of the silicone hose to make sure they are meeting each other in a straight line. The silicone hose only overlaps the compressor outlet just barely enough to use a hose clamp. Get that hose clamp right up to the very edge of the silicon to ensure that it is fully clamping down against the compressor outlet, rather than trying to squeeze the silicone off the end of the compressor outlet.