H/C/I C6 LS2 dyno #'s
Thread Starter
Racer
Joined: Oct 2010
Posts: 318
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From: Rosharon TEXAS
Hi Sean,
It's a good question you ask.
With 450 rwhp, I just checked my fastest scan and I'm at 91% duty cycle, but just touching it at peak HP, from 6700-6900. It's below there for the rest of the run. I have stock heads. I suspect that if I added TF heads and upped power to the 513/450 range I'd be at the limit of stock injectors or a little past.
You can reach 450 rwhp with stock heads, obviously. More like 460 if you have stock gears. You can likely keep your stock injectors if that's your goal.
I'd recommend thinner head gaskets if you get a cam, .040's increase compression to 11.4 and gives you back some low end you lose with a cam. I had 386/379 with bolts ons too, and I didn't lose anything down low with the increased compression. The FAST is also a great mod, worth every penny.
If you want bigger injectors my friend is selling a set of 42 lbers.
Hope to see you at the track or Towers.
OP, did you get bigger injectors with your setup?
It's a good question you ask.
With 450 rwhp, I just checked my fastest scan and I'm at 91% duty cycle, but just touching it at peak HP, from 6700-6900. It's below there for the rest of the run. I have stock heads. I suspect that if I added TF heads and upped power to the 513/450 range I'd be at the limit of stock injectors or a little past.
You can reach 450 rwhp with stock heads, obviously. More like 460 if you have stock gears. You can likely keep your stock injectors if that's your goal.
I'd recommend thinner head gaskets if you get a cam, .040's increase compression to 11.4 and gives you back some low end you lose with a cam. I had 386/379 with bolts ons too, and I didn't lose anything down low with the increased compression. The FAST is also a great mod, worth every penny.
If you want bigger injectors my friend is selling a set of 42 lbers.
Hope to see you at the track or Towers.
OP, did you get bigger injectors with your setup?
Tech Contributor
Joined: Jul 2002
Posts: 14,949
Likes: 263
From: St. Louis, MO
St. Jude Donor '08
Are you sure? With that power I'd bet you have 42lbrs. If I'm at 90% with 450 rwhp you must be out of injector with 513!
But EG would have scanned this and kept you safe. I sure would think you have new injectors.
A Meziere is an electric water pump. Worth 10 rwhp or so.
But EG would have scanned this and kept you safe. I sure would think you have new injectors.
A Meziere is an electric water pump. Worth 10 rwhp or so.
Le Mans Master
Joined: Oct 2006
Posts: 5,078
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From: Cumming, GA
Thread Starter
Racer
Joined: Oct 2010
Posts: 318
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From: Rosharon TEXAS
Yes sir,im absolutely positive my injectors are stock.
Thread Starter
Racer
Joined: Oct 2010
Posts: 318
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From: Rosharon TEXAS
Track Junky
Joined: Jun 2007
Posts: 4,074
Likes: 36
From: Orlando Area
Tech Contributor
Hey Joe,
I think I remember Jeremy from HPS telling me that the stock injectors could get you in the 500-525 rwhp range. He did cringe a bit with that info, so it seems that he didn't feel entirely comfortable about recommending that. I think I read a thread by Spin a while back that said he was making 500ish on his stock injectors at 97-98% duty cycle.
SouthTexasBully,
If you have a copy of your dyno, take a look at AFR. If it appears to be leaning out in the upper RPM band (ie, drifting up with a constant AFR demanded), I would think that the stock injectors can't keep up with the car's power. Something to consider.
Sean
I think I remember Jeremy from HPS telling me that the stock injectors could get you in the 500-525 rwhp range. He did cringe a bit with that info, so it seems that he didn't feel entirely comfortable about recommending that. I think I read a thread by Spin a while back that said he was making 500ish on his stock injectors at 97-98% duty cycle.
SouthTexasBully,
If you have a copy of your dyno, take a look at AFR. If it appears to be leaning out in the upper RPM band (ie, drifting up with a constant AFR demanded), I would think that the stock injectors can't keep up with the car's power. Something to consider.
Sean
Le Mans Master
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From: Somewhere in the Mid 9's TX
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Le Mans Master
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From: Cumming, GA
Melting Slicks
Joined: Sep 2007
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From: READING PA
St. Jude Donor '08-'09-'10
Thread Starter
Racer
Joined: Oct 2010
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From: Rosharon TEXAS
I didnt know to ask for that.i will next time.thank you for your help.i found out that im at 95% on my injectors.i'll be sharing results next week on some new mods to my n/a build..thanks bud,chris
Race Director
Joined: Dec 2006
Posts: 12,315
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From: Fort Worth, Texas
Great numbers, suprised to read a few of the guys with ~500rwhp are still on stock injectors. Depending on the weather when you logged them you could be over 100% in good air(ie -DA) I wouldn't want to risk it on a motor with that much money invested. IMHO, Chris
Race Director
Joined: Sep 2003
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From: Now in God's Country, the Big Sky, Montana!
Cruise-In 7-8-9-10 Veteran
St. Jude Donor '06-'07-'08-'09-'10-'11-'12
We always go with bigger injectors when adding heads.
