2.75 pulley, stock intake and exhaust dyno results...

[jordanvraptor]

Terminatrix had some warranty work so I had to return her to almost bone stock condition. Work is done so I am proceeding with a different buildup. I put the Kenne Bell 2.75 press on pulley on with a UPR tensioner idler pulley and a 74 inch Gates belt. That was coupled with the stock airbox and silencer with a drop in K&N filter and the stock catback. It netted me a dyno run of:

409 rwhp and 453 rwtq on a Dynojet with 83 degree temperature day.

I have the Predator's spark advance all the way to the right at plus 10% and am still only seeing 20 degrees at WOT near redline. Fuel was 20% added in the 2-4K range and 10% in the 4-7K range, it is still rich as the AF ratio measured wth a sniffer was 11 or below. It is a good safe tune though. I may add the JLT True Cold Air CAI or go with another cone filter like Steeda, etc. I'm looking at 3 inch catbacks with a future higher boost application in mind.

Just thought it might be of interest as to what a 2.75 will do with stock intake and exhaust...

 

[CobraBob]

Why did you elect to pulley your Cobra before changing the intake and exhaust. You should be reducing the intake and exhaust restrictions first. Then a pulley/tune can make more power. I'm confused why you went in this direction. ??

 

[HectorCobra03]

i also have a 2.75 with predator
but with intake and xpipe

could mi car be in the 450's

how much gain could i expect if i added a borla exaust?

 

[CobraBob]

With a Borla (or other) catback and your mods you should definitely be in the 450s. I had a 2.90 upper, catted X-pipe and Steeda (Borla) exhaust and I made 457rwhp. Had an Accufab TB/plenum, too, but that only added less than 10 hp. With your 2.75 you should be above what I was making.

 

[jordanvraptor]

Originally posted by CobraBob
Why did you elect to pulley your Cobra before changing the intake and exhaust. You should be reducing the intake and exhaust restrictions first. Then a pulley/tune can make more power. I'm confused why you went in this direction. ??

Terminatrix had some warranty work so I had to return her to almost bone stock condition. Work is done so I am proceeding with a different buildup.

It had previously had a 2.93, idler, 74 inch gates belt, powerstack air filter, and MAC 2.5 catback. I sold the filter and exhaust so I could proceed with a 3 inch catback and different CAI. Previously it made 440/460.