hooleyboy

Today I got my Evosport headers, and renntech airbox today are here are the results. I also ran a dyno with some race fuel. Rich the owner of Dyno-comp in AZ is a killer guy and hooked me up with a bunch of dyno runs. Install took abit longer than they thought and the airbox did not arrive until 3pm so there is no dyno with just the airbox. There was a 6.6% adjustment with the weather. and Rich the owner of Dyno-Comp says with "his" Dyno Dynamics Dyno driveline loss is 29% and that was agreed upon by all the shop techs. I would say I got some OK gains Was kinda hoping for more but it is what it is here they are....

Base dyno with Renntech ECU, Then Headers+airbox, then all parts with race fule


Renntech ECU, Renntech airbox, Evosport Headers,


All the above + Race fuel

hooleyboy

based on my car having 362 at the crank and my very first dyno i was at 291hp at the wheels few weeks ago. I picked up 40hp at the wheels. that brings my total to 402 if i add the crank hp to the amount i gained at the wheels so what do you think I have for power at the crank now? Dyno comp said some wear around 426 crank HP. Do you think thats about right?

DarkXerox

looks like their V8 headers actually do something. I'd give most of the credit to the ECU tune though, good numbers!

hooleyboy

My true baseline dyno was 291hp at the wheels then I did the ECU alone a week or so ago and got 18.5hp gain at the wheels and that put me at 309.9hp.

calimax

Daaaaamn boy!, looks like I got some competition on the block although you'll be smokin me around the block regardless, since my S/C clutch Finally took a dump. I've been driving around with it unplugged, and I get 27mpg @45mph, not bad, but now it's like I drive a C230,lol

FrankW

nice gain for sure, but 29% loss is bogus...because if you dynoed 339...29% loss would put you at 477 crank. Unless you had a typo...I'd say you had about 19-20% loss on that particular dyno which puts you around 420 ish crank with the race fuel.

hooleyboy

I believe the calculaton they used to estamate crank HP is 331x1.29=426.99... Rich at dyno comp is calling renntech to see if they will do a map for me free of charge for race fuel and when i head to the track I can just stop buy the shop and get the map loaded up and then returned to normal when im not racing.

My only gripe with the parts i got is the bang for the buck factor. i picked up 21hp with headers and airbox I was just hoping for a bit more.

alroumi

Impressive numbers, you've gained quit alot for boltons. Enjoy the added performance.

Biscuit

That's the downside of a normally aspirated engines is the bang-for-buck factor of bolton mods. The upside being you don't have to wait for anything to spool up to start making power.

I have to say though that those numbers are pretty impressive and you should be proud for sure. What's the next step for you? Cams maybe?

Enjoy the car!
Rich

Chazz

Looking good Hooleyboy! I wish I lived a little closer to Scottsdale. I would love to have Dyno-Comp re-run my numbers.

By the way, what's the labor cost of having headers installed? And how do they sound?

hooleyboy

I wish I had a scanner or even my digi cam thats on loan. with race fuel I picked up 20hp at redline. I'm not really sure were to go from here I want this car to be reliable as its my daily drive. I'm open to suggestions I want to get a safe 10-15 wheel hp more

mkonei

do you know of anyone running the AMS crank pulley? you might get some power there. as far as reliability, the diameter is the same as factory, so it wont affect your accessories.

hooleyboy

Its funny you say that because i'm on there website now.

wawy

hooleyboy,

As always, thanks for posting another informative thread. Just a few questions if you don't mind answering:

How difficult was the installation of the headers? Did they have to undo the engine mounts etc? How long of a job was it to finish?

Most importantly, how does the C55 "feel" now? Can you notice it's a bit quicker now? More low-end grunt or is it more noticeable higher up in the rpms?

mkonei

thats an easy mod too

c55asleep?

IMO headers are a great mod for a C55. Ams crank pulley ftw!

///AMG4EVER

Congrats on your project, great numbers hooleyboy!

Enjoy it!

hooleyboy

Install took 5 hours so it cost me $500 as far as i know The motor mounts were not removed the Dyno comp guys that do not sell evosport and sell renntech said the headers are nice and good quality. The headers look like they freed up some space from stock manifolds and i would think that would allow for better airflow around the header (keeping it cooler). To be honest this car is much faster its faster in in every way. At a rolling 10mph when you jump on it it just explodes with power. The back end slams down and you can see the front end come up and I'm gone. to be honest 100mph comes up faster than ever with he same pull of the lower gears (based on my butt dyno). its a new car that simple. for people just running stock you dont know what your missing. I picked up an extra 20HP at redline. Before Hp would taper off at high RPM's Now it just kinda keeps doing and the taper off effect in power is much less. Last night I went for a beat run and found a Ferrari 360 spider and messed around with him and we were neck and neck. I had a smile from ear to ear. Not saying that i can beat a Ferrari but he didnt get away.

hooleyboy

rather than start a new thread whats your thoughts on the AMS crank pulley?

hooleyboy

You got to get that fixed bro. so we can head to the drags. I think i might be going tonight to see what my time is.

AMGSC

Worth every penny. Car responds instantly when you hit the pedal. Extremely light and well made. I got mine for $550 a year back but probably available for$500 now. It takes some effort to get the crank bolt off but Vadim has the tools for that. You will also need a new bolt from the dealer too but don't cost much.

calimax

yeah, I know. With how fast the gas is climbing every day at the pump, it looks like im going to put off any more go-fast mods. Clutch sells for $900 @ the dealer. Brandon @ Code3performance said he will be offering rebuilt clutches, so we'll see. For now I can get a couple of more days of fuel usage driving like grandpa without the S/C! If you go let me know! I'd like to come with, just to watch.

hooleyboy

I'm going tonight sent you a PM.

c55asleep?

It does jump a little harder off the line (more torque). As for the tool ebay has it for about $40 dollars. When I replaced the crank pulley I also replaced the bolt and the top plastic idler pulley it had blown out the grease for the bearing and car only had 15,000 miles so keep an eye on that.

FishtailnZ

Great info hooleyboy, thanks!