How far do you guys push 91 fuel?
How far do you guys push 91 fuel? I got a 71 nova, lq4 engine all stock other then ls9 gaskets, 224/224 112 cam, ls6 intake, has a gt45 76/77 turbo. Cr should be around 9.4. I ran the car in about 5k da, 85 degrees outside, ait stays at or below 130. It went 1.62 short time, 10.81@124 on 10psi of boost and 17ish degrees of timing, this is through a ptc converter, 4l80e, 3.08 gear, 3610 lbs. Now according to those number its around 530 to 540 rwhp real world, so maybe a little higher on a sae corrected dyno.
Question is how much harder do you all think I could push this thing on straight 91 fuel? Thought of maybe trying 13psi on like 15 degrees, but im sure the iat's will come up a little too right away.
Curious to see how far some of you have gone with pump fuel (and not blown it up) I do not want to hurt the engine just to try and run a number, I just want it to run the best it can
Question is how much harder do you all think I could push this thing on straight 91 fuel? Thought of maybe trying 13psi on like 15 degrees, but im sure the iat's will come up a little too right away.
Curious to see how far some of you have gone with pump fuel (and not blown it up) I do not want to hurt the engine just to try and run a number, I just want it to run the best it can
Last edited by Jake99; Jul 27, 2017 at 08:51 AM.
I got a 71 nova, lq4 engine all stock other then ls9 gaskets, 224/224 112 cam, ls6 intake, has a gt45 76/77 turbo. Cr should be around 9.4. I ran the car in about 5k da, 85 degrees outside, ait stays at or below 130. It went 1.62 short time, 10.81@124 on 10psi of boost and 17ish degrees of timing, this is through a ptc converter, 4l80e, 3.08 gear, 3610 lbs. Now according to those number its around 530 to 540 rwhp real world, so maybe a little higher on a sae corrected dyno.
Question is how much harder do you all think I could push this thing on straight 91 fuel? Thought of maybe trying 13psi on like 15 degrees, but im sure the iat's will come up a little too right away.
Curious to see how far some of you have gone with pump fuel (and not blown it up) I do not want to hurt the engine just to try and run a number, I just want it to run the best it can
Question is how much harder do you all think I could push this thing on straight 91 fuel? Thought of maybe trying 13psi on like 15 degrees, but im sure the iat's will come up a little too right away.
Curious to see how far some of you have gone with pump fuel (and not blown it up) I do not want to hurt the engine just to try and run a number, I just want it to run the best it can
I'm at 12 lbs. w/ a T7875 but I'm also at sea level for the most part.
I don't know what the timing is at and now that I think about it I've never pulled a plug either lol.
Some guys in here seem to think you can go a lot higher on pump only, I was recommended by my tuner not to go much higher than 12 lbs. on straight pump only.
I don't know what the timing is at and now that I think about it I've never pulled a plug either lol.
Some guys in here seem to think you can go a lot higher on pump only, I was recommended by my tuner not to go much higher than 12 lbs. on straight pump only.
http://i58.photobucket.com/albums/g2...pssng0ioxh.jpg
http://i58.photobucket.com/albums/g2...sdkrixtmw.jpeg
http://i58.photobucket.com/albums/g2...psek35oetq.jpg
http://i58.photobucket.com/albums/g2...sdkrixtmw.jpeg
http://i58.photobucket.com/albums/g2...psek35oetq.jpg
Last edited by Jake99; Jul 27, 2017 at 06:35 PM.
Yeah, it seem's to me that it's getting close to the edge, I am running a br7ef plug in it so that should help. I think im going to try 12psi once it cools down a bit. I put a 28in slick on the back to race it, im going to try and get a little tire up front and up the 2 step a little more, this was leaving on 2.5psi of boost at 2700 rpm. Id like to see if I get it running 10.50 on pump fuel. I drove the car 2.5 hours up there, raced it, and drove it home. Avg 16.8 mpg with the racing lol
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Verdad Gallardo Not if it's right lol, ill just have to work on the car to get the et down, I think I get can 10.50s with this power. I made 806rw with this same combo in a friend pickup, that was just e85 and 20psi, so if I want more ill just go that way, this is still on the factory tank and 5/16 fuel line, 255 pump and vett filter..
Problem is e10 91 is pretty much 87 with a little ethanol in it, without the octane being any higher I dout it would help any. You could probably tune it too 11.0af on 91 then put a gallon or two of e85 on top of the 91 which would get you better fuel and lean you up to 11.5af, but I feel like if im going through the hassle of that I might aswell run straight e85. But then id need to put a cage in it and trailer it.
I sure **** hope not. All we have up here is e10 and the stuff sucks. And for small engines over the winter? OMG. Weedwacker, lawn mower, blower..... I've cleaned and replaced quite a few carbs over the years.