T9ja

Recently, I just added new mods and tuning. Mods added were LT headers with 400 cell cat and just added 172 mm pulley on friday and re-tuned.
Previously, My best track time was 12.1 @ 115.75 mph before this mods were added. Added LT Headers with 400 cell cat, ran a best of 12.1, and 121.75 mph. Did a tune, mph dropped to 117 mph, especially on the 2nd 1/8 mile, lost 3~4 mph. 172 mm pulley added, and re-tuned the ECU. Still running 12.1 @ 117 mph. Is it safe to retry the first tune setup before this mods were added, which will be small s/c pulley and EC tune, HE, and bosch 010 pump?

Hulk

You are pulling timing most probably because of iats being high or you are getting knock retard
Are you logging?

T9ja

Didn't have that problem before It was tuned. No, not logging. I'm thinking it most likely, the new tune.
I had 9 runs at the track in < 3 hours after I installed the headers. First run, I trapped 120.41 mph, and last run of that day, I trapped 121.75 mph, so I don't see how it can be the IAT. The mph are consistent. No drastic drop observed. But after putting on the tune, I've lost ~4 mph at the 2nd half of the track.

Hulk

Adding that bigger pulleys adds heat. Everything is a balance.. So more boost needs more cooling

T9ja

This was before I added the 172 mm pulley. Just added the 172 mm pulley 2 days ago, and ran it today to see if there are any difference, but still running the same. I have the split cooling kit already, just waiting on instructions to install.

Hulk

What's your timing, what are your iats?

black06c230

All that and still on stock cooling??? Yeah losing power up too now. Check IATs and then address cooling.

T9ja

Doing just that. My concern is that the problem started after I re-tune. I thought headers suppose to help with cooling? Again, this started before I added the 172 mm pulley. I was just wondering if it's possible to go back to the old tuning before this recent mods were added?

Hulk

No the old tune doesn't account for the bigger pulley

e500slr

I agree, you're getting knock, retard :P

Seriously though cooling should be the first thing you should address before modifying these cars. If you don't do cooling then you'll be heat soaked as soon as your turn the damn thing on.

99lightning

do split cooling I jUst had a car on the dyno and street with only a upper pulley, and the heats was killing it without the split.

T9ja

This is what I gat for the split cooling kit. Do I suppose to have a 3/4" T? Didn't get installation instructions. Waiting on that. Have seen some couple of video, but didn't remember seeing the 3/4" T. Anyone have instructions for installing this kit? Gat it from BIP.
Attachment 308094

Hulk

Ask bip for the install instructions

chawkins2001

I would get it on a dyno, and get the air fuel graph and timing looked at. Send that file to your tuner, let him update the maps and re-upload the new tune.

Might as well also get a race gas tune, that is good for some extra HP. I will get some install instructions for you.

T9ja

I'm waiting on that. Thanks. Will a custom dyno help, since my tuner is EC, and I'm here in Maryland. How do I go about it?

Hulk

Better yet start logging!
Custom tune you can do on a dyno. You do pulls and you send the print out to EC and they adjust the tune. Logging is always much better to tune

T9ja

What brand is the best for data logging and cost effective?

Hulk

Zt2 with dashdaq(ndash)

Unfortunately it is not cheap

Crissus

400cell is stock since a decade in nearly all brand cars. I think maybe even the AMG metal cats are less. 400cell is Bad and restrictive.

T9ja

It's 3" mid pipe all the way to the stock resonato.

T9ja

Can I have yours as a gift? Will do a price search. Thanks for your input.

Hulk

No prob, nope not getting rid of it. For some reason mine went bad cause I dropped it and went off sporadically and had to get another because the repair was almost as much as a new one, my friend picked up the repaired one off me and I got another one.

T9ja

This what my dyno graph looks like before and after I installed the LT Headers.
Attachment 308096

Hulk

You added good power, just would add a little fuel