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Discussion in 'S-197 Mustangs' started by Weather Man, Nov 19, 2015.
Appreciate that, good luck with your mods!
The car is driving very nicely and no worries. With that said, I have continued to think about how the car is meeting performance expectations with all the work that has been done and feedback provided by a variety of sources. There are a lot of clues that I was working back and forth and decided to go down to DB Performance and talk things over with Danny.
The primary clue was that the boost the car was making just didn't match expected HP and TQ on any comparable (as close as I could find) 4.6 mod motor. The boost curve itself was not matching and while belt slip might be part of it, did not seem like all of it.
Part of this puzzle is that I am probably Danny's most vexing customer I do listen to his input, but I am not afraid to tell him I want to go a certain way or use a certain part. He is willing to go along with this because I never bitch when I **** up and I always pay him, LOL.
Anyway, I was running over my concerns and he pulled up my dyno chart so we could look it over. I asked him if he could overlay any comparable 3V charts. He overlayed a stock cam and comp stage 2 cam 2.6 kenne bell.
I about ****ing fell over.
The problem, with absolutely no hard feelings to anyone, is that Crownaviation (1st buyer of a SPEC R who was killed in a car accident) never got a chance to make it to the dyno. The cam he had L&M design and build to aid streetability worked exactly as designed, it limited the bottom end TQ. I personally think Crown would have gone with another cam once he found out how badly this cam hurt TQ and HP. I ordered the same cam as my salute to Crown, no regret.
So, based on what Danny and I thought was the issue, Danny gave the owner of Bullet cams a call. He basically confirmed our suspicions and based off specs on my car he is building a set of cams that should perform quite a bit better, I hope.
So, waiting for cams to be built and Jason is fabbing up the pulley mounts so I can improve belt tension. When I have all the parts in hand, will try and slot into Danny's schedule and see what happens.
The red line is the stock cam 3V. The black line is the COMP stage 2 3V and the blue line all the way to 7,000 + RPM is mine (the worst performing).
Misc pics I did not add when I fixed PB crap.
Cam in and now on the way to Microblue for coating.
Off she goes, hopefully see what happens next month.
Under the knife. Everything looked good, but the chain guides looked a little distorted, so upgrading to MMR race guides. Hopefully have it buttoned back up by the end of next week, if parts show up.
Badly underestimated how Xmas would affect parts coming in. MMR race guides finally came in and now she can be assembled.
Car is buttoned back up and idles fine on the current tune. Danny actually thinks it idles better than on the old cam. Now Danny and LITO schedules need to sync up next week hopefully since Danny is gone the week after that.
The mechanic who did most of the DOB install moved on, so John who did the turbo work did this work. One of the dash 20 fittings developed a small leak, he had to buy a new wrench, LOL.
Belt wrap improved also.
Lookin' good man! I don't think you could get that belt to wrap any more now lol And is that a 12 rib belt now?
Still 10 rib, I do have a slightly bigger idler pulley, but it had a smaller diameter post, so went with the one that would be less likely to be torqued to the side.
On a side note, tech thought the MMR chain guides reduced chain play significantly better than the plastic guides. The plastic guides were definitely deforming, so good to have addressed it I think.
Boy that is a sharp looking unit.
Nice work man
Appreciate that, a lot of thought, ****ups (on my part) and rethinking, LOL.
Cool, I bet they would work even better if you removed the MMR name off the front of them haha
I hear you, LOL. Individual parts you can inspect are fairly safe I think. There are a few other providers, but Danny just doesn't do much business with them.
Yea I get your philosophy, it's just like buying tools from Harbor Freight lol. I'm just messin' with you, heck I might even order a set of those next time I have my motor apart.
Yea I get your philosophy, it's just like buying tools from Harbor Freight, as long as it's a simple hand tool that doesn't do anything critical it's probably okay lol. I'm just messin' with you, heck I might even order a set of those next time I have my motor apart.