f1a
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
Definitely should be making a bit more then that. You SURE you are making a true 15 psi all the way up...? What KPA are you seeing in HPT?
What is the pulley combo?
15 psi on a stock motor making 700 isn't too bad.... But 15 psi on a 414 with decent heads and a cam should be quite a bit more... Like 800 ish...
Tons of variables affect all of this tho...
What is the pulley combo?
15 psi on a stock motor making 700 isn't too bad.... But 15 psi on a 414 with decent heads and a cam should be quite a bit more... Like 800 ish...
Tons of variables affect all of this tho...
Melting Slicks
Joined: Mar 2008
Posts: 2,412
Likes: 4
From: Houston/Dayton Texas
Sure you don't have a pb600 under there??? ill fall out of bed and make 700..on a stock motor with a p1.. you differently have something wrong... plus.. if you stopped at 6100..and you don't have a 0.75 pulley..your not even getting close to the RPM band of a F1a.. they require you to spin it at a much higher RPM then a normal blower... which is why a stroker motor sucks for a FI car..esp a F1a
Before adding just a pulley, read up on the characteristics of what you are actually putting on your car and learn what works together and why...not just throw a bunch of parts at it because others say it good..
Before adding just a pulley, read up on the characteristics of what you are actually putting on your car and learn what works together and why...not just throw a bunch of parts at it because others say it good..
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Melting Slicks
Joined: Nov 2003
Posts: 2,213
Likes: 134
From: In front!
My old numbers with a 390ci motor and 17.5 psi with a YSI made 793rwhp. BUT, I have a stock TB, stock Intake, puny 1 3/4 headers with a tiny leak, my cam is too small for my motor, and my compression ratio is just over 9.1:1. So, I know that I also should be making more power but, because of what I listed, it is what it is. I was also at only 15 degrees of timing and tuned very safe.
I list all of these to give you an idea of all the issues that can contribute to a low number. It also depends on dynos, Da, temp, etc.
Josh strokers are great for f.i. if they are built right. I will race you when I get there in March.
I list all of these to give you an idea of all the issues that can contribute to a low number. It also depends on dynos, Da, temp, etc.
Josh strokers are great for f.i. if they are built right. I will race you when I get there in March.
Thread Starter
Cruising
Joined: Sep 2014
Posts: 11
Likes: 0
I'm running a fast 92 setup and LG pro long tubs 3 inch x and s type cat back they told me today I was running out of octane on 91. It just doesn't seem right. Kinda new to corvettes but my old ysi cobra would fall on its face like this every time plugs went bad but there saying that's not it.
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
How confident are you in your tuner? Not all of them know what they are doing with FI. I had my 1st blower tune done by a WELL KNOWN tuner, and was disappointed in the #s after his tune, but he said that was all he could "safely get". I took it to the tuning school a few months later, and we got another 130rwhp. (mostly timing) I installed a meth kit and increased boost a couple and timing a couple, and picked up 70 more. There's a lot that can be left on the table.
Melting Slicks
Joined: May 2007
Posts: 2,014
Likes: 48
From: Dayton Ohio
91 is pretty low octane by itself and the lower compression wont help you there either.
Post up the graph. Meth or E85 should help alot with a good tune. More octane, more timing, and lower IATs FTW
Go to the Big Dawgs thread sticky section and look how many in the 700+ categories are running meth or E85.
Post up the graph. Meth or E85 should help alot with a good tune. More octane, more timing, and lower IATs FTW
Go to the Big Dawgs thread sticky section and look how many in the 700+ categories are running meth or E85.
Last edited by PEETYZ; Sep 26, 2014 at 12:35 PM.
Racer
Joined: Sep 2013
Posts: 469
Likes: 62
From: coconut creek, fl
I would look into what could be wrong before doing other changes that's low compression I don't think e85/meth is gonna solve the problem. Why does it stop pulling at only 6000? Maybe valve springs? 15 psi is pretty good and only revving to 6000
What size is your blower pulley?
What size is your blower pulley?
Melting Slicks
Joined: Mar 2008
Posts: 2,412
Likes: 4
From: Houston/Dayton Texas
Now.. I believe the issues is the setup as a whole.. poor compression-no meth-bad tuning unless the guy is smart enough to know he was going blow it if he kept going..
If i was to guess.. i believe your timing was probably only 10-12 degrees or so..that would make for very low numbers but higher boost levels... simply because your were detention because of no fuel..f1a comes in very fast in the high end and you need to have the ocetene to keep up with it..
Melting Slicks
Joined: Nov 2003
Posts: 2,213
Likes: 134
From: In front!
Defintly off. I was at 700 with a stock cube motor and P1 at 10lbs.
How confident are you in your tuner? Not all of them know what they are doing with FI. I had my 1st blower tune done by a WELL KNOWN tuner, and was disappointed in the #s after his tune, but he said that was all he could "safely get". I took it to the tuning school a few months later, and we got another 130rwhp. (mostly timing) I installed a meth kit and increased boost a couple and timing a couple, and picked up 70 more. There's a lot that can be left on the table.
How confident are you in your tuner? Not all of them know what they are doing with FI. I had my 1st blower tune done by a WELL KNOWN tuner, and was disappointed in the #s after his tune, but he said that was all he could "safely get". I took it to the tuning school a few months later, and we got another 130rwhp. (mostly timing) I installed a meth kit and increased boost a couple and timing a couple, and picked up 70 more. There's a lot that can be left on the table.
No offense dude but...what you just said is not possible...
easy... Its very easy to get fooled into thinking your fast when you live in Boise..home of tow fast corvettes and a ton of vtech powra!!! Don't come crying to me when you shift at 6300 and daddy goes right on by..btw..if your home..text me..
Now.. I believe the issues is the setup as a whole.. poor compression-no meth-bad tuning unless the guy is smart enough to know he was going blow it if he kept going..
If i was to guess.. i believe your timing was probably only 10-12 degrees or so..that would make for very low numbers but higher boost levels... simply because your were detention because of no fuel..f1a comes in very fast in the high end and you need to have the ocetene to keep up with it..
Now.. I believe the issues is the setup as a whole.. poor compression-no meth-bad tuning unless the guy is smart enough to know he was going blow it if he kept going..
If i was to guess.. i believe your timing was probably only 10-12 degrees or so..that would make for very low numbers but higher boost levels... simply because your were detention because of no fuel..f1a comes in very fast in the high end and you need to have the ocetene to keep up with it..
OP, what Josh said was probably spot on...without knowing the rest of your setup. My car, on that old setup that I told you about in the earlier post...is leaving 30-60whp on the table just in timing alone...