Great! Can you post a dyno sheet?
What timing settings did you try with the 272 In / 264 Ex?
What setting gave maximum torque, with smoothest A/F data curve, etc.?
(No 4-whel dyno like yours over here, so that kind of data is VITAL to me.

Can you give an opinion about comparisons with 264 In / 264 Ex and the 272 In / 272 Ex set-ups? Dyno sheets / WHP@RPM / Torque curves / A/F data etc?

I need MINIMUM turbo lag with MAXIMUM low-end torque for AutoX.
I want to buy Vishnu kit, but I need this info first to select turbo, cams etc.

 

I still dont know why the smoothest AFR curve is needed but you should look into the 10.5 hotside and maybe talk to 4G63>0000 as he runs a very aggressive cam timing, ask him what he has to be careful of and how it affects his day in and out use of the car ect. See if thats something you can deal with. BTW check this thread out with Vishnu tuned national pro winners https://www.evolutionm.net/forums/sh...7&page=1&pp=15
https://www.evolutionm.net/forums/sh...ad.php?t=98460

 

Well, we've completed the dyno testing of the two different cam timing settings. I don't have the charts yet (Andrew?), but I will post them as soon as I get them. The results were interesting...

 

Retarding them makes a bit more power up top, but flattens the midrange. It has always been like that.

 

can you elaborate please?

Did you drive the car between cam setting changes / dyno runs?

Are you living & dying by the WOT dyno pulls?

 

Noize is correct.

After Shiv tweaked my car, I made back to back dyno comparisons between the -3/-3 and -4/-1.5 cam settings. The latter setting resulted in an idle quality that was at least as good as stock. However, the decrease in overlap from this setting reduces exhaust gas velocity in the midrange, which caused the turbo to spool ~200rpm or so later. The delay in the intake valve closing by retarding the intake cam increased the peak power by a nominal margin. While the higher peak numbers may seem attractive, the loss in midrange torque more than offset the increase.

 

Ted....I thought you had all the charts, I am sure I put them in your file did you leave them behind?
I will resend if needed

 

Maybe I did leave them? If you can send them, it would be great!

 

If/when you post the runs, could you post them with the AFRs?

I'm currently running a custom tuned 272/272 setup at -4/-1, so I'm very interested to see the differences on your car.

l8r)

 

When I post them, I will post them with the A/F and boost graphs.

 

im running straight 272's -4/-4 on AEM gears.

 

Ted b- are you currently running the -4/-1.5 set-up then? what is your drivability impression. did you see anyone else @ the dyno day with a simmilar set-up while using a different cam combo?

thanks

would like to see those dyno compare's!

 

No, I went back to the -3/-3 because I prefer the better midrange pop. Like I said, the -4/-1.5 gave a better idle and just a bit more peak power, but the drop in torque more than offset any benefits. I'll post all the charts as soon as I get them.

 

Thanks, I actually meant to type -3/-3, due to the tq gain. not only cant I communicate verbally, I cant even type what I mean too!

 

I will email them to you tomorrow Ted