Any updates on 280 + stock turbo??

Girlie

 

actually i already ordered it....apparently it was in backorder....but they told me that they shipped it this week, so hopefully i'll have it with me next week and install it and tune it that same week....i promise i'll post results as soon as it's done

 

finally here are the results......they are SAE corrected.....first, the previous TT tune was a little on the lean side.....we baselined at 12.8 A/F ratio.......so the previous whp numbers were changed to SAE and the results were 323.7 whp and 313.9 tq with 25.8 psi peak (tt tune).........new numbers after adding HKS 280 exhaust cam (with a 11.2 a/f ratio) and reflashed by Gadiel are 374.5 whp and 352 tq at 26.3 psi peak (93 oct and 112 oct mix) and 355.3 whp 325.9 tq at 23.4 psi peak (same a/f ratio)......so conclusive proof the 280 on the exhaust side works....ill post the dyno sheet tommorrow

 

Did you upgrade your valve springs and retainers?
I also added a 280 cam, but it seems my valves are floating being I made less hp than cars without the cam.
Any thoughts to this?

 

no i didn't upgrade springs and retainers. It doesn't seem I am getting any kind of valve float.....and the power band is mantained all the way to 7600rpm, so the exhaust cam makes a big difference

 

Are you a newbie???Any HKS EVO Cam no need valve spring.

 

thanks for the info and updating us with results..

 

When your old enough to drive anything besides a go-kart, let me know, till then I wouldnt be advising anyone here.
Not to mention, my evo 8 is making over 500whp with most of the work done by me.
Being there arent to many evo 9's running around with 280 cam, there isnt enough research yet to say that there isnt any valve float with the 9 valvesprings.
And my 9 seems to be demostating valve float, Which my tuner (Shiv) agrees.
I was hoping there where others with some experience with the 280 cam...

 

LOL. That kid is getting a little cocky.

 

im confused i see a chart of a stock turbo car,topic says adding hks 280 to evo 9.

yet i dont see a before, dyno chart.

i see what i assume is the after chart

then i read gt35? but dont know where that is

im confused.

 

haha burnt...

Statix I guess he doesn't check out socalevo.net?

 

do the 9s have stronger springs? i dont understand how a 280 wouldnt cause valve float.

 

Its not the cam itself, its the profile, and that the profile makes peak power further in the powerband, so they rev the car further than they would with the stock cams.

 

That is a good question.
Maybe there softer?
I was very iffy on putting in the 280 cam for that reason but it seemed to be a 50/50 shot cause half the people I talked to including HKS said "It should be fine" other shops said no.
Being there already seemed to be a couple people here running the 280 without any problems.
Ill post my dyno graph when I get it, by about 6000rpms my power band flatlines, not matter how much Shiv changed the tune the power curve wouldnt change, which made everyone there believe the valves where floating???
At the end of the day my 9 made 318hp/325trq with a TBE,test pipe,MBC,280cam.
Which is what they other 9's where making without a cam.

 

well, my mechanic and my tuner both agree that there was no valve float present. And I think the dynochart show convincing evidence that the 280 made a substantial change. In the dynochart you see 3 tunes. Bottom one was by TurboTrix. Middle one was with 280's with 93 oct and top one was 280's with 93 oct with about 2 gallons of C-12