^ I've only read about people disabling LTFT's and running just on the ST's. How common is that or is that a good practice?

 

When you've tuned hundreds of cars and trucks you know when it is ok to do. And it can be done for troubleshooting purposes too.

 

^ Hmmm.. ok.. I've been doing some reading on the labyrinth that is tuning..

Anyway.. [/jack]

 

In running my GTO with a MAFless SD tune and no o2 sensors hooked to the pcm.... I did a lot of street tuning on it with my wideband and Hptuners to get the exact fuel and VE maps I wanted, then locked them in and just use the MAP and air intake temp for adders to hold everything where I need it. But this is in a 408 with a 255/263 .624/.624 115 lsa

 

which lifters are in the motor? I can't remember if its the 850s or the 875s, but one of them is a short travel lifter that needs .003-.005 preload, if you use the standard preload all the valves will hang opened

 

Stock 02 LS1 lifters. The heads have never been off.

 

Damn I thought I solved the problem with a quick brain storm......the new cam didn't collapse the lifters did it?

 

Your customer might want to stop working on their own vehicles. I'd personally never swap a cam & rockers without doing the pushrods & valve springs too.

 

The customer is fully capable of changing his own parts. He just relied on crappy parts recomendations from what he thought were two knowledgeable reps from Comp Cams who both recomended this cam. My first post states he used Comp 924 springs.

 

Took the car to 5800 rpm on the dyno today with no apparent PTV issues. Had to stop the tuning again because of fuel pressure issues. So I guess the TRex is not the biggest cam you can run without fly cutting.

 

What sort of power is it making?

 

So still no measurement on the ptvc...just take it on up to 7k an see if it hits

 

450 on a Mustang dyno. We multilply this dyno's numbers by 1.14 and get pretty close to Dynojet numbers. Only did 3 pulls. One to 4400 rpm, one to 5200 rpm and one to 5800 rpm. Fuel pressure dropped bad on the last pull so we stopped until the problem can be found The fuel pump has already been changed so there may be a leak in the tank and also a boost a pump is going to be installed. It is only making around 4 psi on the boost gauge though.

Chris, the rev limiter is at 6600.

 

We got the car back on the dyno today after fixing a fuel pump hose leak and adding a Kenne Bell BAP with pretty good results. The rest of the mods on the car are a Procharger P1SC-1, 63lb Siemens injectors, long tube headers into a ORY and a cat back. And of course, the big cam. The rear end is a 9 inch with 4.10 gears and the car is a M6. We pulled it 12 times taking it to 6600 every pull with no apparent PTV contact. Logging boost with the dyno equipment we saw a high of 7.8 #s after some belt tightening. The pull here was with the hat and filter pulled off the PC head unit. There was one pull where it went to 567 after a longer cool down but it was pretty consistant making 560 without much cool down. The power went down to 510 with the hat and filter back on. I've seen the filter restriction problem on several Procharged F-bodys.



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I know you guys were concerned about PTV contact, but...only 6600rpms? Any plans to re-dyno and take it any higher? It appears to still be pulling hard at that point...

 

Not without some bottom end work. This is a 100% stock original long block with cam and springs.