Took the car to the dyno today and met up with ptatohed and the_wizard too. Dyno days take forever!! I got there at 9am and didn't get to dyno until almost 3pm. But, anyway here's the graph. Frankly, I'm surprised with the numbers (thought it would be lower).




VIDEO!
http://www.youtube.com/?v=rKvkUMh4QNU


264 whp / 249 wtq

powertrain/drivetrain mods:
V2 blower with 3.48" pulley
V1 plate (Stillen)
Blitz SS
Walbro 255 HP, stock injectors, stock kit Vortech FMU
BKR6E-11 1-step colder gapped to .040
Warpspeed Y (2.5inch)
HKS Sport exhaust (60mm)
Clutchnet stage 2 organic clutch
Raxles

Not all that impressive compared to the 300+ hp guys, but it's a work in progress. How's the A/F look? A bit lean?

 

Not too bad. Congratulations. Wish I could offer more insight...

 

AF is VERY lean IMO. You need to be closer to 12.1

 

wow nice #s eric....definitely has potential....haha remember we were talkin about u hittin only 235....haha congrats!

 

Thanks haha yeah I remember that. I was thinking about a VQ35 swap and keeping it N/A, but if I'm at 260hp now, then I'm not so sure I want to "downgrade" to ~215whp.

 

you should check your MAF voltage to see if your maxing out. You might want to upgrade to larger injectors also if you want more power

what psi are you boosting at?

btw, your car looked good at the performance meet

 

Thanks Larry, your car looked excellent as well with the new wheels. I need to fix some oil leaks first but the next stage would be:

370cc or 480cc injectors with afpr
Z32 MAF
3" charge pipe with CAI
b-pipe and cat

I'm at 8psi right now and don't plan on downsizing the pulley any time in the near future.

 

headers may help put down more power without downsizing the pulley are changing much of anything else

 

since you are boosting I think you are running too lean as well. What FMU disc are you running? You may want to bump up to a higher rate. IMO you are playing with fire with those AFRs.

 

It's whatever the V1 Stillen kit came with originally (6:1 or 8:1). I don't think I should be increasing the fuel pressure any higher than it already is. Wouldn't larger injectors be a wiser choice?

 

Hey man, I saw you there!
You actually looked kinda pissed off. lol
Did you think you were going to make way more?

I got there at 10:00 and dyno'ed right after you.
Your A/F looks fine in my opinion.

 

Oh, I probably looked pissed off because I got there soo early and had to wait the entire day to dyno.

I actually thought I was going to make much less...I was only expecting around 240whp.

 

damn those #'s are high

 

heh, same here.
It took almost 5 hours to dyno.

 

As it sits right now you have enough fuel upgrades to keep the monster fed. What are you usuing to tune the car, SAFC-II, E-manage........ Just richen up the system across the range and you should be fine. Just remember you don't want to be too lean, other wise you'll be doing the 3.5 swap before you thought. Try to get it between 12 to 11.5 or 11 to be really safe.
Choray

 

Are Apexi and Greddy the only two options as far as an electronic AFC goes?

 

ewuzh, i want S/C too. what should i do?

 

Go to the next size FMU disk or raise your base fuel pressure. Bring your AFR's down around 12.

You shouldn't be running too much fuel pressure and your not maxing out the MAF. You are getting close to maxing out the inejctors though. But your fine where your at.

Curve looks nice, congrats!

 

WOOOT!! Nice. Way to represent! That means I'm probably kicking *** with my 10psi pulley, lol.

Why would you need bigger injectors if you probably aren't maxing out your stock injectors or your maf??? If you don't plan on going down in pulley sizes you are wasting your money with the maf/injectors.

 

Yeah I think you're right on that. I beleive Jim's running stock injectors and he put down ~315whp on a 10 psi pulley

 

it's not that your injectors are not close to being maxed out, they are. It's that your using an FMU which increases fuel pressure which in turn makes your injectors flow more. 315whp is beyond what stock 240cc injectors are good for at a reasonable fuel pressure.

 

Or you could do the 3.5 swap and keep the supercharger

 

Congrats Eric. Nice numbers. It was great to catch up with you again. When's Stillen day this year? FTR, I am on stock injectors.

 

Eric thats about par. I'm at 7.6 psi and seeing 268whp.

 

Nice numbers. Thought I would here more of the SC. But that's because of the tires/drums.

 

Should be sometime in June like last year. That will definately be fun. Hopefully I'll have some more upgrades done by then. Gotta catch up to you

 

Before you go richening or leaning out your mixture how did they sample the AF ratio? Was the sensor a properly calibrated sensor placed in close proximity to the head? Does the shop use a different sensor for cars with leaded/race fuel vs unleaded fuel?

If not then ignore those radings. On forced induction cars these things need to be followed closely. If the sample was taken from the tailpipe it is probably off. Any exhaust leak and bad sensor can have a large effect on the reading.

I once proved this to someone who had the same issue. Thought he was lean based on a tailpipe sniffer. We then took the Zeitronix wideband and placed it just after motor in the exhaust stream. Turns out their wideband was over 1 full point off.... it was showing lean when in reality it was nearly perfect.

 

There are a few more options out there but those are the most popular around here.
Choray

 

A/F was sampled from the tailpipe. Isn't this where dyno shops take the readings from when tuning?

 

Tail pipe is OK if you have no cat and your sure there is no exhaust leaks

 

I agree totally, as long as the shop has a sensor that is worth a crap. 95% of all shops that I have experience with, that use a tailpipe sensor, I would nto trust them to tune from that reading.

Again just because they have a sensor and tell you something does not mean they are correct. I would ask them the questions I posed above and if they tell you it doesn't matter, I would not trust them for tuning or AF readings...

Probably sound like a skeptic but that has ben my experience with PLENTY of shops.