I'm new to FI and my car is currently in the shop getting an APS TT installed and I've read some comments from people with JWT Cams in twin turbo systems raving about how good of a combination this is.

I value the expertise of members here so I'm wondering if someone could explain to me the pros and cons (if any) of adding these cams to my project.

You can see in my signature what I'm getting installed. Is adding the JWT cams worth the money and would it benefit my setup?

Thanks.

 

If 40hp and 25ft lb trq sounds worth the extra labor and cost then go for it. My car made that much more than the same exact tune on another car with out cams. Sounds mean tooo.

 

Sounds very interesting, do you have the specs on the duration for both the inlet and exhaust cams and the valve lift?

Peter

 

was your previous dyno without the helix test pipes and stock cats? I think you were about 410HP or something?

 

from this thread

 

Yes, as stated by JeffesonM its the JWT S1 cams. Courtesy of zcargarage.

 

Most likely one would see even better gains with the Tomei 264s ; however, idle quality and low end TQ would be compromised a little. The JWTs are symmetric (260/200) hence mild enough to not degrade low end TQ noticeably and idle smooth after a slight idle rpm increase.

barthelb , what did Rob bump your idle up to?

 

I think my idle is about 1200 when I first turn it on then it idles around 700-900 can't really tell for sure

Yes with cats and nismo exhaust it was 410 395trq

 

I have the Greddy TT and the idle with JWT cams where set at 1000 rpm's... is a little high but when I put it in 900 at the dealer the car make the idle very bad so I put it back on 1000 rpm... is that normal?

 

Unless you mean 1000 rpm with defrost or AC activated , 1000 seems high given that JWT recommends a bump to 850 (AC/defrost off and warmed up).. You might have somthing else going on, like a leaky BOV, plenum gasket etc...

 

FYI

Checked mine yesterday and its around 850 then when I put on the AC it goes to just about 1000rpms.

 

I have the JWT S1 cams and love them on my NA setup... I've been told by a bunch of folks with experience on big HP VQ's to just keep the stock cams... umm, not sure what I'm going to do...

 

"Yes with cats and nismo exhaust it was 410 395trq"

I actually don't think the JWT cams gave you that extra 40 rwhp or 25 rftq. The more likely culprit was removing the cats and replacing them with the test pipes. For example, my car dynoed at 404 rwhp with the Borla TD exhaust and RT High Flow Cats. I switched out the cats for test pipes and went to the Greddy EVO II exhaust and the car dynoed at 444.5 rwhp with those changes alone. I'm sure the cams changed the power curve, but again don't think they are the items that gave you most of your increase.

By the way, to answer the poster's question, I'd buy forged pistons and rods and have them installed before I would install cams on this car. The car will run fine without the JWT cams. Forged pistons and forged rods are more important than the cams IMHO.

 

If you'd read the post properly you would have noticed that i said i made 40hp 25 ftlb or torque more than a car with the same equip and same tune. You can obviously tune a car different to gain more power. But when you put two cars side by side with the same timing and a/f and one makes more because of cams what would you conclude?

 

40hp and 25ft lb trq sounds a lot for just cams. I have heard that the stock cams are more then fine for some high hp.

 

Sure 410 with OEM cams would be considered "some high hp" in most books. But another ~40 is nothing to sneeze at either. The benefit of the mild cams with FI has not just been shown with TTs, It has also been demonstrated with SCs.

 

i wish i just had the cash to ask about getting cams with my tt

 

Hmm if I have a leak, the car put the Check Engine Ligth on?

btw my cams give the car 20 whp and 22 wtq on N/A and rigth now I'm around 20 whp more than the avg. whp with 5.6 psi so I know the cams make a difference.

 

Just a little odd, I've heard 3 cars with JWTs and idle set to ~850 and they all idle very smooth. Do you jave a vac/boost guage, if so what's you idle vac?

 

Its around 16 on vac... I will check again the idle in the dealer tomorow, just in case!