pump gas limits?
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From: winter springs, fl
Originally Posted by Pro Stock John
Thanks Stevie, good to know. I'm 8:1 and am running around 21 degrees of timing so I'll have to make some pump gas passes at some point.
Originally Posted by Got Me SOM
why is that?
Or lowering the compression to offset it?
The bigger bore, has to do with how well the mixture is distributed in the cylinder. In a smaller bore it spreads better and lights off more evenly. According to the internet anyway...
About lowering the compression, since quench isn't as big a deal on an FI application, you can easily lower the compression with a dished piston. In a NA application this in itself can create more detonation problems. But with FI you can get away with it, and then get further away from being right on the ragged edge of detonating. A little drop in compression can make a big difference, more difference than the bigger bore brought to the table.
Mine put out ~750/750 on 93. 370iron. GMR got 780 out of another TT trans am they did. At the crank we're talking 850-900hp on 93 no meth and FMIC. Ultimately it comes down to c.i. the bigger the motor the more power you'll make before detonation.
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Originally Posted by Got Me SOM
on 346 cubes I'm thinking 600 rwhp is attainable on pump with safety based on what members here have posted.
383-650
402-700-750
427-750-800
with the new lsx blocks coming out like the dart and gmpp who knows you're talking close to 500 cubes so maybe 900, that's crazy.
383-650
402-700-750
427-750-800
with the new lsx blocks coming out like the dart and gmpp who knows you're talking close to 500 cubes so maybe 900, that's crazy.
600 RWHP on a 347, are you being serious? I've made over 600 HP on a 4-wheel dynojet with a 2.6L (159 cubic inch) skyline motor on 93 octane. I have a friend making over 700 RWHP from a 331" ford motor with a non intercooled vortech blower on 93 octane and his car is a real driver with a 5-speed, AC, power steering, power windows, power locks, and 4 seats. My car went 134 MPH short shifting and spinning at 3600 pounds with 284". I'm thinking around 725-750 RWHP and I drive this car every single day to work, unless I need to haul something and then I'll take a truck. On my 91GT when it was still a street car I made well over 800 RWHP through a 5-speed on 93 octane from 360 cubic inches and an 88mm turbo.
Your numbers maybe sound right for a car running non-intercooled and an auto with a loose converter, but I think if you can't throw down 700+ RWHP on pump gas from any LS1 combination and do it with some degree of reliability you havn't really built it right.
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Eviltwins, when folks talk about max numbers on pump gas, there are a million different factors. If I could hit say 650rwhp on pump, I'd be the equivalent of like 700-750rwhp for an M6.
Originally Posted by Pro Stock John
Based on Stevie's info, I'm thinking I can run at least 145mph on pump, I don't really care what it dynos.
Dont lie John.... LOL
j/k
Originally Posted by eviltwins
Your numbers maybe sound right for a car running non-intercooled and an auto with a loose converter, but I think if you can't throw down 700+ RWHP on pump gas from any LS1 combination and do it with some degree of reliability you havn't really built it right.
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From: Loganville, GA
Originally Posted by Tiago
850 rwhp on 93 with 12 psi on a 347ci with M6 on only 12 degrees of timing at tq peak on up
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From: winter springs, fl
i dont care what my car dynos, as long as it traps and performs how i want it to. low 10's would be fun, but id preffer it to be a bad *** street car. all id want is a/c and a 140mph trap, but enough usable power to go to a autocross or road course and of course fill up at any mobil1, maybe on a t76 or something similar? im all ears.
Originally Posted by eviltwins
600 RWHP on a 347, are you being serious? I've made over 600 HP on a 4-wheel dynojet with a 2.6L (159 cubic inch) skyline motor on 93 octane. I have a friend making over 700 RWHP from a 331" ford motor with a non intercooled vortech blower on 93 octane and his car is a real driver with a 5-speed, AC, power steering, power windows, power locks, and 4 seats. My car went 134 MPH short shifting and spinning at 3600 pounds with 284". I'm thinking around 725-750 RWHP and I drive this car every single day to work, unless I need to haul something and then I'll take a truck. On my 91GT when it was still a street car I made well over 800 RWHP through a 5-speed on 93 octane from 360 cubic inches and an 88mm turbo.
Your numbers maybe sound right for a car running non-intercooled and an auto with a loose converter, but I think if you can't throw down 700+ RWHP on pump gas from any LS1 combination and do it with some degree of reliability you havn't really built it right.
Your numbers maybe sound right for a car running non-intercooled and an auto with a loose converter, but I think if you can't throw down 700+ RWHP on pump gas from any LS1 combination and do it with some degree of reliability you havn't really built it right.
guess you're the almighty guru when it comes to making pump gas engines, excuse me.
Originally Posted by Hennytime
i dont care what my car dynos, as long as it traps and performs how i want it to. low 10's would be fun, but id preffer it to be a bad *** street car. all id want is a/c and a 140mph trap, but enough usable power to go to a autocross or road course and of course fill up at any mobil1, maybe on a t76 or something similar? im all ears.