C5 Forced Induction/Nitrous C5 Corvette Turbochargers, Superchargers, Centrifugal, Twin Screw & Roots Blowers, Twin Turbo Kits, Intercoolers, Wet & Dry Nitrous Injection, Meth
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Old Sep 20, 2012 | 12:34 PM
  #21  
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Originally Posted by Turbo-Geist
Race fuel at the track or on the street? What happens if the fuel pump fails during a run? I don't think there is a way to take that into account.
Both if you're going to be pushing the car to its limits.
There are ways to retarding boost when fuel pressure drops.
You have to have a fuel pump. You don't have to have a meth pump.
I've run meth for several years, although in the back of mind I know how easily a meth setup can fail.
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Old Sep 20, 2012 | 12:51 PM
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Originally Posted by Turbo-Geist
Race fuel at the track or on the street? What happens if the fuel pump fails during a run? I don't think there is a way to take that into account.
The new piggy back Haltech allows you log meth pessure and fuel pressure and build a safety table in case the pressure drops.

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Old Sep 20, 2012 | 12:54 PM
  #23  
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I already use the IAT table to pull timing in the upper flow/upper IAT area but I've been reluctant to use the IAT injector flow rate table to add fuel because it's just one row and I know I'll see ~120 degree IAT's in the summer while sitting in traffic. I suppose it's better to let it go rich in that situation and let the fuel trims fix it to add that additional safety level.
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Old Sep 20, 2012 | 01:01 PM
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Originally Posted by Turbo-Geist
I was searching for the Fuel Enrichment vs IAT and apparently I don't have that parameter in my 1999 operating system. I have the upgraded 3 bar OS but the IAT enrichment doesn't appear.

Is there anything that I can do to gain this option? I already pull a lot of timing if there are high IAT temps, but it would be nice to be able to add some fuel to make up for the loss of methanol.
Good point.

I don't think it's available in stock C5 PCM.

I guess Arun has some neat tricks to do it!
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Old Sep 20, 2012 | 01:16 PM
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Originally Posted by Pekka_Perkeles
Good point.

I don't think it's available in stock C5 PCM.

I guess Arun has some neat tricks to do it!
That table was available in 01. I am not sure about a 99 but on the 2000's I will flash in a 02 OS to get this table.

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Old Sep 20, 2012 | 01:31 PM
  #26  
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Originally Posted by Arun@CCP
That table was available in 01. I am not sure about a 99 but on the 2000's I will flash in a 02 OS to get this table.

Yes sir, that's right! Thanks for the tip!
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Old Sep 20, 2012 | 03:37 PM
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Originally Posted by robert miller
Man that is a ton of meth for that amount of time r a ton of in boost one...:Glad you can tune her now, wish I could take the time to take a class and do it. Then we cant blame any one but ourself.lol:
Had the f-1c at 24psi but just upgraded to the f-2. Just came back from a little tuning with new setup.With the f-1c at 6600rpm's i was at 24psi now with the f-2 at 5700rpm's i'm at 26psi of boost and started to poop my pants HOLYSH$T i should of upgraded along time ago. The way my car is hitting i don't thing i ever have to take it past 6k rpm to SH$T my pants. My meth turns on at 7psi duel 15 nozzles pinned at 8 on the alky dial.
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Old Sep 20, 2012 | 04:40 PM
  #28  
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Originally Posted by mdaniel
Both if you're going to be pushing the car to its limits.
There are ways to retarding boost when fuel pressure drops.
You have to have a fuel pump. You don't have to have a meth pump.
I've run meth for several years, although in the back of mind I know how easily a meth setup can fail.
I see what you are saying, but for me, meth and a wideband are non-negotiable. I typically drive 40 miles to the dragstrip so race gas is out and I don't care to spend the money on it. Doing a test hit watching the wideband has saved me many times. One time I was hitting some cells that I hadn't hit before and going lean and another time I didn't have enough fuel in the tank. I credit the extra fuel and octane from the methanol for keeping it alive.

Originally Posted by Arun@CCP
The new piggy back Haltech allows you log meth pessure and fuel pressure and build a safety table in case the pressure drops.

The Haltech is beginning to look more and more appealing.

Originally Posted by 5 Liter Eater
...I've been reluctant to use the IAT injector flow rate table to add fuel because it's just one row and I know I'll see ~120 degree IAT's in the summer while sitting in traffic.
You could use it at the track in a controlled condition, but your setup is already pretty well though out, so it may not be necessary.

Originally Posted by Pekka_Perkeles
Yes sir, that's right! Thanks for the tip!
I wonder if I can flash an 02 OS into a 99?
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Old Sep 21, 2012 | 09:27 AM
  #29  
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Originally Posted by Arun@CCP
That table was available in 01. I am not sure about a 99 but on the 2000's I will flash in a 02 OS to get this table.

What are you doing on C6s? No "Add vs IAT" table for those.
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Old Sep 21, 2012 | 10:03 AM
  #30  
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Safety measures in the tuning are paramount! I also like to hit the test button on my controller when I know the car will be driven hard.
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Old Sep 21, 2012 | 10:03 AM
  #31  
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Originally Posted by SargeZ06
What are you doing on C6s? No "Add vs IAT" table for those.
Injector Flow Rate Control / Flow Rate Mult. VS: IAT.

One thing to note is that if you have a scaled tune and/or are up against the IFR limit (63#/Hr) then any of the multipliers won't allow you to exceed that.
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Old Sep 21, 2012 | 08:12 PM
  #32  
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Originally Posted by 5 Liter Eater
Injector Flow Rate Control / Flow Rate Mult. VS: IAT.

One thing to note is that if you have a scaled tune and/or are up against the IFR limit (63#/Hr) then any of the multipliers won't allow you to exceed that.
Yep the car has 63.X across the IFR table already.
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Old Sep 22, 2012 | 10:35 AM
  #33  
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Originally Posted by Arun@CCP
Good to here Scotty, Bret, Kris and I tune the same way-we make power safely.
Is this a pure meth inj or 50/50 meth/water inj?

I understand that either one of those setups would cause @atasttrophic failure if it was to cut out.
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Old Sep 22, 2012 | 03:28 PM
  #34  
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First time at the track after replacing the S with a YSi and vacuum lines blew off on 3 consecutive runs (went from 13 psi peak to 25 psi.)
I already relocated the IAT sensor to the intake manifold and add timing starting at 130F and that worked.

3 Problems when the vac lines blew:
  • Meth fails because boost referenced
  • Fuel pressure drops because boost referenced and BAP dies too
  • No Brakes!
I tune my my car but have had help from many here; Bret and Arun for example - many thanks!
One recommendation: zip tie all vac line connections
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