Jump to content
TEAM SHELBY FORUM

Looking To Mod The Engine On My Kr


Bruce49

Recommended Posts

Q: It seems the CAI that comes with the S197 KR is 'sealed' at the bottom. That, and I'm afraid to go with another brand for fear of too much air being drafted from underneath as well as from the hood. I'm also concerned about the fit regarding the hood and the fixture around the filter itself (clearance issues/good seal). Anyone do this and have success or failure?

 

Next, want to swap pulley sizes and get a better tune. The only other thing I want would be some headers. I had Kooks but dang they were loud. But, bang for the buck, it turned my 09 GT500 into a beast. CAI, pulley, plugs, headers, h-pipe and tune netted 640HP at the flywheel.

 

So, has anyone swapped the CAI and pulley with a tune? Whatcha get? How's it drive?

 

 

Link to comment
Share on other sites

I've done the pulley/tune and later the TVS swap. I'll tell you right now, just skip the pulley swap and pick up the TVS with a good elbow and tb. The differences are dramatic. The TVS will outperform the pullied stock Eaton and not even work hard doing it. Costs for TVSs are very reasonable. As for the exhaust I've done the muffler deletes on my KRs and love them. If you've heard the sound clip of the new GT350 my cars sound a lot like that at start up. BTW, I'm still using the KR's cai and the TVS fits perfectly under the strut bar. HTH.

Link to comment
Share on other sites

 

^^This^^

 

Why bother will all of the other stuff when you gen get an additional 100 ponies just by this swap.

 

 

I can tell you why. Basically, the TVS is more efficient (and has more potential). At the higher boost pressure the stock Eaton generates a lot more heat than normal. When you upgrade to the TVS, the heat levels drop back down, but you still get the added boost and horsepower benefit. So, if all you do is spin the stock Eaton faster (keeping everything else the same) you are stressing the engine and cooling system more. This results in "heat soak" and the computer pulls timing to compensate, netting you less consistent power. If you plan on upgrading your cooling system to compensate for this phenomenon, why not also upgrade the TVS with a smaller pulley and get even more benefit? So, that's why.

Link to comment
Share on other sites

 

 

I can tell you why. Basically, the TVS is more efficient (and has more potential). At the higher boost pressure the stock Eaton generates a lot more heat than normal. When you upgrade to the TVS, the heat levels drop back down, but you still get the added boost and horsepower benefit. So, if all you do is spin the stock Eaton faster (keeping everything else the same) you are stressing the engine and cooling system more. This results in "heat soak" and the computer pulls timing to compensate, netting you less consistent power. If you plan on upgrading your cooling system to compensate for this phenomenon, why not also upgrade the TVS with a smaller pulley and get even more benefit? So, that's why.

 

Yes, it's common knowlege that the Eaton generates a lot of heat which leads to heat soak.

My recommendation for a TVS is what you stated plus more.

 

It's a simple swap. There's no need to mess around with the KR tune. As you're aware, the KR and GT500 have different tunes. I spoke with some techs at Shelby and they all say, you can bolt on a TVS (on a KR) and not have to make any changes to the KR tune.

The OP wants to swap pullies, install headers, fool around with the CAI, and mess with the tune. My suggestion is to skip all of that nonsense and simply swap to a TVS blower and be done with it.

Link to comment
Share on other sites

Well... since I'm the OP, there's an easy answer. Cost. You're looking at ~$3500 for a TVS compared to <$1,000 for a pulley, possibly a different CAI and a tune. It's a short term/more HP fix until such time I can break funds loose.

 

I can do the TVS now if someone helps pay for my kids tuition at TT... Or, you can adopt...

 

Note to self: change avatar!

Link to comment
Share on other sites

Well... since I'm the OP, there's an easy answer. Cost. You're looking at ~$3500 for a TVS compared to <$1,000 for a pulley, possibly a different CAI and a tune. It's a short term/more HP fix until such time I can break funds loose.

 

I can do the TVS now if someone helps pay for my kids tuition at TT... Or, you can adopt...

 

Note to self: change avatar!

 

My advice. Leave it be until you can get the TVS. I think prices are closer to $2500 but I could be wrong. I'm sure someone will come here soon and correct me.

 

In the meantime, you may want to think about "rotational mass". Carbon fiber driveshaft, drilled and slotted rotors, lighter rims....etc

Link to comment
Share on other sites

Yes, it's common knowlege that the Eaton generates a lot of heat which leads to heat soak.

My recommendation for a TVS is what you stated plus more.

 

It's a simple swap. There's no need to mess around with the KR tune. As you're aware, the KR and GT500 have different tunes. I spoke with some techs at Shelby and they all say, you can bolt on a TVS (on a KR) and not have to make any changes to the KR tune.

The OP wants to swap pullies, install headers, fool around with the CAI, and mess with the tune. My suggestion is to skip all of that nonsense and simply swap to a TVS blower and be done with it.

^

this

Link to comment
Share on other sites

Well... since I'm the OP, there's an easy answer. Cost. You're looking at ~$3500 for a TVS compared to <$1,000 for a pulley, possibly a different CAI and a tune. It's a short term/more HP fix until such time I can break funds loose.

 

I can do the TVS now if someone helps pay for my kids tuition at TT... Or, you can adopt...

 

Note to self: change avatar!

you forgot the price of the long tube headers too. that's gonna be at least 1000.is my guess plus labor if you have someone doing it.

Link to comment
Share on other sites

you may be able to use the stock KR (Ford Racing) tune, but you should confirm that to be sure. More importantly, you will NEED a new tune to get the most out of the TVS. even if the KR tune is identical to the FRPP TVS kit tune (which i personally don't believe), i can tell you from experience it is very conservative. anyway, what's the hurry? stock KR not good enough for a daily driver??

Link to comment
Share on other sites

you may be able to use the stock KR (Ford Racing) tune, but you should confirm that to be sure. More importantly, you will NEED a nee tune to get the most out of the TVS. even if the KR tune is identical to the FRPP TVS kit tune (which i personally don't believe), i can tell you from experience it is very conservative. anyway, what's the hurry? stock KR not good enough for a daily driver??

 

We've been through this before about the KR tune. It's different from the "Ford Racing" tune and you do not need to adjust the tune to get the most out of the TVS. I don't have the time to look for several links on this very subforum explaining such.

 

Hoping Gary [shelby_pt] chimes in.

Link to comment
Share on other sites

I've spoken with BJ over at VMP about this and contrary to popular belief, the KR tune will not work with a pulley/tune/CAI mod. It's not the same. If you want a solid answer go over to www.FordGT500.com and speak with him about it or call him at VMP Tuning (321-206-9369 ext 112). In order to get that big HP you're looking for it's going to require the TVS, exhaust, larger injectors and a few other things. VMP's price is around $3K for the TVS I believe.

 

Good luck.

 

AK.

Link to comment
Share on other sites

 

We've been through this before about the KR tune. It's different from the "Ford Racing" tune and you do not need to adjust the tune to get the most out of the TVS. I don't have the time to look for several links on this very subforum explaining such.

 

Hoping Gary [shelby_pt] chimes in.

 

Nope. How is it different? I recall the last discussion I read concluded it was in fact the same. Shelby American didn't do anything to the FRPP tune that comes with the FRPP CAI kit that was used on the KRs.

Link to comment
Share on other sites

 

Nope. How is it different? I recall the last discussion I read concluded it was in fact the same. Shelby American didn't do anything to the FRPP tune that comes with the FRPP CAI kit that was used on the KRs.

 

Again, waiting for 2 people to chime in about this. I'm 99.9% certain the FRPP and the KR tune are different.

Link to comment
Share on other sites

I don't know, maybe it wasn't the MAF, but I can tell you that my KR felt a helluva lot stronger than my previous 08 model. It made around 60 more hp and I'm sure the 3:73 gears and better suspension also helped.

Link to comment
Share on other sites

like you said, probably a function the combination of upgrades... rear gearing, cold-air intake, tighter suspension, quicker short-throw shifter, revised throttle mapping... even the louder exhaust adds to the experience.

Yep, the 07-09 models should have been what the KRs were performance wise.

Link to comment
Share on other sites

Yep, the 07-09 models should have been what the KRs were performance wise.

 

Yeah, but thankfully all that stuff was available from Ford Racing and Shelby American. I think Ford was being conservative when they released the GT500. There were no modern-day pony/muscle cars to contend with or test the market against in 2007, aside from the 2 year head start of the 2005-06 Mustang GT. The Pontiac GTO was as close as you got. Everything else was high-dollar sports cars or European exotics. Anyway, the KRs are great cars. If I had unlimited funds, I'd get one.

Link to comment
Share on other sites

No, it was because Eaton couldn't produce enough of them at the time to meet production.

Hmmm, that's a new one. Never heard that one before. Doesn't make sense. They could have done a KB instead then.

 

My discussions with Amy at the time and Roger S. made clear it was Ford that nixed it.

Link to comment
Share on other sites

Per the book "The Ford Shelby GT500" written by Larry Edsal in 2007, (there is a section in the book about the KR) Ford Engineer Jamal Hameedi said that his GT500 team wanted to use the screw-type supercharger but very late learned that the supplier couldn't produce the rotor set in the quantity needed so they had to use a traditional Roots blower. And, they also found out from their supplier there was a patent issue with the supercharger they were supplying and had to go with a different design. That fact may or may not have applied to the KR but the TVS wasn't used until the 2013 model year. It's possible Amy and Roger didn't know why Ford didn't or couldn't use it. The book only says they used the Ford Racing Power Upgrade Pack on the KR. Shelby and Ford engineers designed the upgrades for the KR.

Link to comment
Share on other sites

So the President of SAI and their top execs were clueless of the real reason the KR didn't get the TVS? Ok, that makes perfect sense. What about the fact that they themselves told me specifically why and they were involved in the project with Carroll?

 

First, there were only 800 KRs per year. Second, based on those numbers other options were available like KB and Lysholm (even if TVS couldnt meet that small demand). Both made SCs for the 5.4.

 

It took until 2014 for the GT500 to reach 640hp and with a 5.8. Yeah,... Ford was not enthused about a Shelby pre titlle GT500 sold off their dealer floors that would over shadow their GT500 for the next 6-7 years and mess up there marketing progression.

Link to comment
Share on other sites

Ok, I've been off of this forum for a long time, but here is the deal. The KR tune is 99.9% identical to the Pro-Cal tune. If you upgrade to a TVS and drop your pulley size down to 2.6" The KR tune will work flawlessly, even with a FRPP throttle body. I've been running this for 4 to 5 years.

I would not waste any amount of money on a new CAI and tune. It's a waste of your time for a KR. That's a GT500 upgrade. Put Kooks on and now your having problems with passing inspection, at least here in NY. You can buy a TVS with a couple thousand miles on it for $1,500, bolt it on and increase your power by anywhere from 110-130 horsepower. It's a quick, easy, and amazing swap.

Recently, I went from a FRPP throttle body to L&M throttle body and it still stays within parameters. The computer can adjust. What you look for when you are data logging is that your MAF voltage stays below 5V. Just took out a ZR1 about three weeks ago from a roll.... Nice!!!!

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

×
×
  • Create New...
...