Delta Cams Dyno & 1320' runs (at altitude)

[farfrumwork]

Last winter I pulled my engine to do a TB job. While it was out I installed some Delta 220 cams, replaced the FW/clutch and replaced every single seal and gasket. I also installed a Crucial PnP stock exh manifold with highflow cross (and ceramic coating). I then heat wrapped the UP and DP and heat sleeved the AWIC lines.

(Edit - I also removed the AC (left the condenser for now) as it never worked in the 4+yrs I've owned the car and I don't need it. (weighed about 25lb iirc))


I have never seen dyno results from the Delta cams on a EJ22T so before I went to work I had a "baseline" dyno session. I then put about 4000mi on the setup and went back for another dyno.

Butt dyno had said: a bit softer under 3000rpms, but much better pull up top.

Here are the 3 pulls post cams/header (pretty damn consistent!!) This is with a peak of 13psi dropping to ~10 by 5000rpms.



**Remember this is at ~5500 feet above sea level** This is a Dyno Dynamics with 1.15 correction factor (would read a bit higher at sea level with 0 correction).


Here is the comparo to the pre-cams/header (pre dyno actually pushed about 1psi more accros the board too). Pink is with cams/header



You can see it is softer down low, the boost hits HARD, and it holds HP out to redline instead of tappering off. On the street it is much more fun to drive as it rewards you with staying in it, intead of falling on it's face. It also spools about 500rpms sooner with real load on the street.

Last Sunday I made it to Bandimere raceway (~5800' ASL) for a few runs - A few is right, as we got rained out after 2 runs and now the track is closed for the season.

Run 1 (bog slightly)
60' - 2.146
330' - 6.262
1/8 - 9.643 @ 73.55
1000' - 12.525
1/4 - 14.979 @ 92.37

Run 2 (lots of wheel spin)
60' - 2.009
330' - 6.015
1/8 - 9.373 @ 73.97
1000' - 12.247
1/4 - 14.693 @ 92.68



My last runs were 2 yrs ago (pre cams/header obviously)
60'------1/8ET------1/4
2.025 - 9.641 - 15.159 @ 89.97
2.072 - 9.607 - 15.071 @ 90.44
2.051 - 9.526 - 14.943 @ 91.27
2.053 - 9.567 - 15.080 @ 89.37
1.996 - 9.488 - 14.944 @ 90.03

1/8mi traps ~72.5mph

So while the dyno looks like there is not that much change - and perhaps a loss, the track agrees with my Butt dyno, that is to say FASTER I gained an average of 2.25mph in traps and dropped 0.3sec from my ET (and I'm sure I could have puleld a bit more out given a few more runs, but that's just my opinion....


Here are some relevant Subaru results from Bandi for comparison.
'08 WRX hatch Stock = 15.3-15.4 @ 86-88
'08 WRX hatch DP/tune = 14.6-14.8 @ 92
'09 WRX (265hp) hatch w/tune = ~14.2 @ 96

I love this car.
Now I NEED some EM. Rob chip or standalone.... I have StI yellow tops and a JEC's MAF waiting.


'93 5spd sedan
EJ22T
VF12
AWIC - custom
Delta 220 cams
Crucial Pnp stock exh manifold, hi-flow cross pipe
CES 3" TBE (catted)
Heat wrapped UP and DP
LW/UD Pulley
Joes MBC
RS 6-spokes with 205/50/16 falken FK451
A bunch of suspension stuff...

weighed in at 3010lb at the track with ~1/8tank gas.

[Legacy777]

Nice post! Thanks for sharing!

[Josh222]

How does yours run with the Delta cams? Mine has a lumpy idle and its only at about 15 In MG vacuum at idle. My mods are a 3" turbo back and 220 grind cams. When its driving it runs great but idle is a little lumpy.

[evolutionmovement]

That's pretty impressive. What kind of change to gas mileage?

[farfrumwork]

Thanks,

Yes the cams do give a lumpy idle. Not too bad, but definitely not stock. I actually like it, but I don't care for the gas smell that comes with it... My vacuum was always low compared to sea level; it was ~14inmg pre-cams, and is now ~10-11inmg. Some EM should help a bit as I should be able to raise the idle to 950rpm, which will increase vacuum and smooth out the lumpiness.

I have lost about 2mpg. I used to average 23mpg on my commute (mixed flat country roads), now it is about 21mpg. I attribute most of this to the idle condition, as my few hwy trips (not too long - just to Denver and back 75-80mph) have yielded 25-26mpg. I used to get 27mpg on mnt drives pre-cams.

Overall, the cams do change the car. Some may not be ale to live with the lumpy idle, or may not like the shift in the power band and loss of some low end torque. Personally it is exactly what I wanted power wise - more top end (and the low end change is not that drastic).

I don't want to do a DOHC head swap. I want to make good power with the stock "crappy" heads - kind of a challenge for me. Perhaps a PnP job on a set of spare heads I have, but I'm keeping the EJ22T heads. They certainly aren't as bad as many make them out to be (if you do a little work and if you're not looking to make >300whp)


The car is super fun, and it surprises cars that have way more power and cost significantly more$$ (Or cars that have ginormous engines, like the stock-ish early 70's Nova with 350 V8 I lined up with last Sunday - dropped it like a brick off the line and held 3-4cars on him all the way down the track )


-Chad

[gijonas]

What did the cams cost?,really leaning towards this option.

[farfrumwork]

I think they are $75 ea, or maybe $95... it was <$200, that much I know.

They have deals going on frequently, so I'd call and see what they can do for you.