phunk's Whipple GT

[phunk]

Ive done some full throttle logging.. a couple runs i went a little higher than I was supposed to for the logging but everything looked safe.

The throttle mapping is softer for the first 10-15% or so, makes it easier to drive the car quiet and smooth when you want to... but doesnt feel quite as aggressive until you push down a little further and get past this "smooth" zone, then I am pretty sure it feels like everything is there that it had on the Whipple tune. I might ask if we can liven up the throttle map a little bit here.. but its not really a problem for me.

I am very curious to see what the power is with 93 and the 3.625 pulley. It might be about the same... I was only making 670 on the Whipple tune regardless of some guys making like mid 700s my car didnt fair so well. So if I have the same on 93 thats good, and then if we can make my big numbers on E85 ill be happy with that.

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[phunk]

Running great so far. should be done exchanging logs and maps in a few days

 

[Dark Horse GT]

Very nice Charles I'm glad to see everything is finally coming together for you :cheers:

 

[phunk]

Thanks. Overall the project has gone pretty well... I am just a well known complainer/cry baby when things aren't going my way. I always end up working it out!

My new concerns are with the mt82. I love how inexpensive it is to get a built short block into this car compared to some of my past projects... But I am not used to having to spend 6g on a transmission conversion as a supporting mod!

 

[esacteksab]

Did anything ever come of you making your fuel system components publicly available?

 

[phunk]

I have been taking slow steps towards that in the background. I am in the middle of setting up as a dealer so that I can package the Fore modules with the system. When its all said and done I will have to either reach out to vendors on the forum here to carry the package, or I will have to sponsor the forum.

Its also nice to get to test it doing more work now, and its doing very well so far. I might try and get it on the dyno this weekend if we are able to finish my E85 tuning. Started raining just now as I was about to go out and do some logging with the 3.5" pulley.

 

[DarkSubRosa]

Thanks. Overall the project has gone pretty well... I am just a well known complainer/cry baby when things aren't going my way. I always end up working it out!

My new concerns are with the mt82. I love how inexpensive it is to get a built short block into this car compared to some of my past projects... But I am not used to having to spend 6g on a transmission conversion as a supporting mod!

Glad to see you sticking with the S550 and providing information for us here on the forum.

 

[phunk]

I'm sure everyone saw the thread.. But for the sake on continuity I will post my Lund e85 dyno results here. See attachment.

 

[phunk]

Time to pull the rear cradle out again. I think I need to replace the Torsen differential.

Nothing new actually, its done this for as long as I can remember. I just cant stand to listen to it anymore. You touch the gas pedal CLUNK, you let off the gas pedal CLUNK.

Now that I have the solid diff and cradle mounts, its become insanely annoying.

 

[mustang_guy]

Try going with a 3.31 differential. Itll be better for boost anyway. It seems mostly isolated to the 3.73 and the torsen itself. The track loks ive all driven dont seem to do it.

 

[phunk]

Ive got a video uploading to youtube ill link when its done in like 5 min. When I first pulled the differential out to change the ring and pinion, we found the turning torque so loose it would barely register 2 inch pounds. I was hoping that rebuilding the differential would make it go away... but nope. Must be occurring inside the Torsen.

Looks like insane backlash at first, but I set it to just under 9 thousandths and when I move the camera out you can see the axles are moving with the pinion pretty instantly, theres just this damn CLUNK inside there.

 

[phunk]

Here what do you think:

 

[mustang_guy]

Ive got a video uploading to youtube ill link when its done in like 5 min. When I first pulled the differential out to change the ring and pinion, we found the turning torque so loose it would barely register 2 inch pounds. I was hoping that rebuilding the differential would make it go away... but nope. Must be occurring inside the Torsen.

Looks like insane backlash at first, but I set it to just under 9 thousandths and when I move the camera out you can see the axles are moving with the pinion pretty instantly, theres just this damn CLUNK inside there.

Ive driven 3 autos one with the 3.55, other two 3.15s no clunk. Also 3 mt82s with the 3.31 and one with a 3.55. None have done it. I really believe its the torsen. The people i see complain about it mostly is PP owners. Btw Stange is making an S-trac differential to fit our super 8.8. Its a much better option then the wavetrac.

 

[phunk]

If other peoples Torsen is doing what mine is doing in the video I just posted... then I might put the exhaust back on and leave it for a while. But without other people telling me theirs is the same way etc, I cant stand to leave it like this

 

[mustang_guy]

Here what do you think:

:shocked::eyebulge: yours has it much worse then other PP ive seen. No wonder youre ready to rip it out. I can only imagine how much louder it is under load.

At first to be honest i thought you were exaggerating and thought it just had the slight clunk most are crying about. But that...thats bad.

I really think its the torsen and the 3.73 ratio coupled together. Go to the dealer tomorrow in your Z and test drive a brand new 3.31 mt82. Bet you wont hear it. Just a suggestion. Switching to a 3.31 will be better i feel. Longer gears are typically better for boost anyway.

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