Raced Guy

I have a C5 with a D1SC at 9psi, tunned very rich at 10.5 degrees of timing at wot,60lb injectors,kb bap, and was thinking of putting a 50 shot on it just to help it out down low. Should it be okay?

Raced Guy

Hmmmm, anyone ???

kp

iTrader: (34)

I ran a 50 dry shot on a P1SC car but I had the MAF recalibrated where it would read at 8psi + the 50 shot and it worked very well. 1/2 a second and 5mph in the 1/4 or so. Putting a 50-75 wet shot on it should be no problem as long as your fuel system will keep up. I would be very careful and keep it rich if you have stock pistons though..

brad8266

iTrader: (23)

10.5 timing is a bitt much retard dont ya think?? Anyway a small shot helps a lot and it really cools down the charged air.

DeltaT

iTrader: (5)

Jeez, I'm running 7.5# at 24 degrees advance and 12.2 AFR. Yours seems too conservative, unless you are knocking all the time. My CR is 9.66:1.

Like brad said... but I think you should get a better tune before you add it. That is what I would call a lazy shop tune - make it work, make it safe, but no optimization.

If you add a shot, think about a MSD retard box that only is active when you are spraying. I use the MSD Multi-Step Retard tied to the NOS solenoids. I like to stick with the NOS recommendation of 2 degrees pulled out for every 50HP in nitrous. AFR target on spray of about 11.5:1.

Jim

My Site: http://home.mindspring.com/~jim_fisk/id1.html

kp

iTrader: (34)

I assumed he meant a rich 10.5 a/f not timing

A 50 shot wouldnt help much with 10 degrees of timing

DeltaT

iTrader: (5)

Either would explain his sagging bottom end!

Jim

BlwnTA

iTrader: (18)

SEE SIGNATURE...no problem here.

EPP

iTrader: (22)

Depending on what octane you have available, you should have no problems running 18 to 22 degrees of timing at wide open throttle, with no spark knock. This in itself would wake up your car. We set C5's up all the time with the timing in this range. Bob

TS6

iTrader: (41)

Wow, thats alot through a stock maf! I didn't think you could do that. I'll actually have an identical setup, but was going to go wet nitrous. Maybe I'll rethink it.....

Raced Guy

I had the scan tool hooked up and at wot the timing was at 10.5 degres, yes they tunned it safe and yes im am not to happy when i found that out, safe is one thing, choking it out is another. It is kind of laggy down low and that is why i wanted to do this.

muncie21

iTrader: (14)

My SC'd C5 runs around 15* at WOT on the top end. 11.2-11.5 AFR. Tried 10.5 AFR and it killed like 20 ft/lbs on the dyno

Raced Guy

So can i just tune it to say 15 deg. at wot and not have to play with the fuel curves, because i can get that done. I dont want to pay another $180 for throwing it on the dyno.

muncie21

iTrader: (14)

You don't have to worry about 'fuel curves' if all you are concerned about is WOT. If that's the case, dial in a sane (11-12) AFR and make sure you don't have any KR. Even then, I'd recommend you check it on a dyno. When I first dyno'd my car my commanded AFR was 12.1x, but my actual AFR was 13.6x. Not good

My opinion? Spend the money and get a good tune. Unless you add more parts, the tune won't go 'bad'.

Raced Guy

It already has a good tune mius the timing issue, it was on the dyno for about 2 hours getting pretty damn good and safe, just want more timing so i can wake it up a tad where its lazy.

muncie21

iTrader: (14)

For the timing, you need to find out what it's running versus the commanded timing. If you are running less than commanded then something's pulling timing on you (heat, KR, etc). If everything is fine, bump your WOT timing in increments of 2* until you see knock, and then back off.

markp03

iTrader: (4)

racd guy where do you live? and what color is your car ? =)

mahhddgtp

With that AFR, you should be able to add a lot more timing, I'd think. If you have a Scanmaster or a knock sensor setup to tell you when you're getting nasty knock on the spot, just go up in timing in increments of 2.

Raced Guy

Mark you know, its Ryan with the peweter C5