Swapped Comp cams 272's for kelford 272's on stock turbo. Graphs inside.

[ssteve]

So let me first say that this was in no way a true comparison, however I figured I would share the results anyways. The only thing that was changed between the two toonz was the cams and we also crushed the Tomei bov a tid bit to try and hold a little more boost.

Heres the mod list

Its a 2003 Evo 8 gsr(so technically its not a stock turbo but you get the point) Oh and I am stevo8 spec btw lol.


STEVO8 Spec IX turbo
STEVO8 spec Exhaust mani&Intake mani
Kelford 272's
Blox cam gears +2/-1
Forge WGA
Tomei BOV
AEM intake tube W/Perrin filter & vibrant maf adapter
ETS uicp
AMS licp
Perrin fmic
Milspec 65mm TB
AMS fuel rail
RC1000
Titek V1 O2 housing
megan 3" DP
testpipe
3" catback with 16" resonator & muffler delete
GM 3port boost solenoid using ECU-controlled boost
Tephra Map switching on stock ECU



For reference on this dyno a couple IX's have hit 400/400 with E85 and run low 11's at 120+mph in full trim. After the first tune when I made 392/394 I was pretty stoked and overall was pretty happy, however I felt the top end was lacking. We already knew the turbo didnt have a whole ton left in it but I figured I would try some cams with more lift and see what happened. I didnt want to loose anything down low as its still my daily driver so I figured I would give the kelfords a shot since they are all the rage with the youngsters these days. The comps were great, great street manners and idled close to stock... The kelfords though idle pretty much like crap with the cam gears like they are(sounds cool as heck though lol) and possibly cause of the prolite flywheel and unsprung disc.(not real sure how much that actually effects it though). Now the top end could use a little more, and eventually I think a BBK will fix that issue for me, but for now Im very pleased with the results. The car feels much stronger as theres as much as a 20whp and 12ft lbs. difference in some places. Also temps in the dyno room were up a decent amount.

[AngryEvo8]

Guess they are all the rage now! Awesome cams, next on my mod list for sure.

[ssteve]

Yeah they are pretty sweet. A lot of people told me that I wouldnt get anything out of them on a stock turbo though so I was skeptical. Filled things in pretty nice and now I have room to play with when I want to throw more air at it later with a bbk or something. They for sure are not too big for a small turbo like many have said though. Ill give up a few rpm of spool to fill in that gap up top any day.

[evo<3]

ohhh yehhh i cant wait to get my kelfords in lookin good man

[Lazyfong]

Still on the stock valve springs? hence the 7k rpm run?

[ssteve]

yes but we cut it off cause theres no power up there on the stock turbo, you can see it falling off pretty hard, theres no reason to drag itout anymore. I shift out at about 67-6800. Rev limit is at 7500.

[evo<3]

hmm well i always hear about people saying to upgrade the springs and retainers but then people like you run on stock springs and are fine. i know its just peace of mind to upgrade them but well has anyone really had a problem with he stock ones?? have an input?

[ssteve]

If I was on a bigger turbo and reving it out I would for sure upgrade them, no doubt about it. I have friends that have run 11.0 lift cams in their track cars on stock springs to 7900rpm time and time again with no issues, so I dont see a street driven car reving to 7k tops being a problem. Next round of mods though will be some supertechs/ti retainers and a bbk full. Hopefully make some more power up top and make real use of these cams.

[Liqquid]

Originally Posted by evo<3

hmm well i always hear about people saying to upgrade the springs and retainers but then people like you run on stock springs and are fine. i know its just peace of mind to upgrade them but well has anyone really had a problem with he stock ones?? have an input?

Comp Cams 280+ and stock valve springs

Stock spring damage with Comp 280's. I wonder what the power difference between them on this setup is, and also how much was attributed to the crushing of the valve... nice to see this comparison though!

[4kinboost]

Originally Posted by ssteve

if i was on a bigger turbo and reving it out i would for sure upgrade them, no doubt about it. I have friends that have run 11.0 lift cams in their track cars on stock springs to 7900rpm time and time again with no issues, so i dont see a street driven car reving to 7k tops being a problem. Next round of mods though will be some supertechs/ti retainers and a bbk full. Hopefully make some more power up top and make real use of these cams.

+1 :d

[scheides]

a solid 400/400 on an IX turbo on this dyno is practically unheard of, great work! Did crushing the BOV actually let it hold more boost? How much are you running anyways?

If you love this setup you'll love the BBK Full even more, all the bottom end and your power band will hold all the way to 8k. I was iffy on doing springs when I did my kelfords, and now that I have my BBK I'm super glad I did.

[GST Motorsports]

Originally Posted by scheides

a solid 400/400 on an IX turbo on this dyno is practically unheard of, great work! Did crushing the BOV actually let it hold more boost? How much are you running anyways?

If you love this setup you'll love the BBK Full even more, all the bottom end and your power band will hold all the way to 8k. I was iffy on doing springs when I did my kelfords, and now that I have my BBK I'm super glad I did.

Crushing the bov helped it not open right at peak boost and hold a little more through the midrange. Up top it was the same however as the turbo just doesn't want to flow much more.

Just crushing the bov took peak boost before (30psi) to 33psi before I let off, at the same duty cycles, same everything. Of course, the duty cycles had to be tuned down to hit the same peak boost as before (30psi). What this shows is that the uncrushed BOV was opening at peak boost.

The car was tuned to 30psi peak.

[evo<3]

im installing my cams soon did you guys get new cam gears?? or are the stock ones good enough??

[ssteve]

They made great power at 0/0. Where I ended up was +2/-1 but it wasnt a drastic change in the curve at all really.

[racer135]

Any difference in idle between 0/0 and +2/-1?