Low Compression + Pump Gas... How Much Boost?
Heres the problem with that, a bad tank of gas or a really hot day the extra heat could cause it to detonate even though it didnt on the dyno. So you'll be depending on the knock sensors to pull timing and keep your motor alive. Get it at a happy medium with boost/timing and a/f and have fun with it. Pushing it to the limit on the dyno isnt gonna benefit you on the street imo.
Let's try it on yours!
You sound like a fairly dense individual... What you don't seem to understand is that some people have self control and are able to keep themselves from pushing the limits all the time. I AM one of those people, believe it or not. What I am asking is "Where is a logical point to draw the line? "
If you have any more negative comments rather than constructive please see your way out if this thread. Thanks for your previous input.
If you have any more negative comments rather than constructive please see your way out if this thread. Thanks for your previous input.
who's tuning the thing? They would be a good resource as to what is "safe" with what your goals are.
You could run low boost with more timing or run higher boost with safe timing. It's all relative really.
Let's say car A is running 600WHp @ 12psi and 15 degrees advanced, while car B is running 600WHp @ 16 psi but with 12 degrees advance. Both are same combos making the same power and are properly tuned with no detonation. One car may be more efficient in the compressor map, one may spool faster, etc.
That being said you dont know how it will react to added timing until you tune it as well. If you feel its safer with a lower psi and is making the Hp or desired performance, leave it.
I would think the pt88 would love more psi to get into it's efficiency range, so I would try to shoot higher psi while it gets tuned and then run it at lower boost settings 90% of the time, so when you do want to up it a bit, you can without getting it re-tuned.
So shoot for 15-17psi. If you feel running at 14 psi is all you need, then back it down and let it live a long life. Once you get used to the power level, you will want to turn it up more, its not a fact of if, but when.
JMO
You could run low boost with more timing or run higher boost with safe timing. It's all relative really.
Let's say car A is running 600WHp @ 12psi and 15 degrees advanced, while car B is running 600WHp @ 16 psi but with 12 degrees advance. Both are same combos making the same power and are properly tuned with no detonation. One car may be more efficient in the compressor map, one may spool faster, etc.
That being said you dont know how it will react to added timing until you tune it as well. If you feel its safer with a lower psi and is making the Hp or desired performance, leave it.
I would think the pt88 would love more psi to get into it's efficiency range, so I would try to shoot higher psi while it gets tuned and then run it at lower boost settings 90% of the time, so when you do want to up it a bit, you can without getting it re-tuned.
So shoot for 15-17psi. If you feel running at 14 psi is all you need, then back it down and let it live a long life. Once you get used to the power level, you will want to turn it up more, its not a fact of if, but when.
JMO
Understood... So say, theoretically, he gets it tuned in safe (for that days conditions) on 17, I only run 14-15 day to day, and if I ever did decide to turn it up (track day for example) to 17 I can throw a splash of 110 in. Would there be anything to be concerned about in that scenario?
On a low compression motor you will start to see a lot bigger gains by adding boost rather then timing.
who's tuning the thing? They would be a good resource as to what is "safe" with what your goals are.
You could run low boost with more timing or run higher boost with safe timing. It's all relative really.
Let's say car A is running 600WHp @ 12psi and 15 degrees advanced, while car B is running 600WHp @ 16 psi but with 12 degrees advance. Both are same combos making the same power and are properly tuned with no detonation. One car may be more efficient in the compressor map, one may spool faster, etc.
That being said you dont know how it will react to added timing until you tune it as well. If you feel its safer with a lower psi and is making the Hp or desired performance, leave it.
I would think the pt88 would love more psi to get into it's efficiency range, so I would try to shoot higher psi while it gets tuned and then run it at lower boost settings 90% of the time, so when you do want to up it a bit, you can without getting it re-tuned.
So shoot for 15-17psi. If you feel running at 14 psi is all you need, then back it down and let it live a long life. Once you get used to the power level, you will want to turn it up more, its not a fact of if, but when.
JMO
You could run low boost with more timing or run higher boost with safe timing. It's all relative really.
Let's say car A is running 600WHp @ 12psi and 15 degrees advanced, while car B is running 600WHp @ 16 psi but with 12 degrees advance. Both are same combos making the same power and are properly tuned with no detonation. One car may be more efficient in the compressor map, one may spool faster, etc.
That being said you dont know how it will react to added timing until you tune it as well. If you feel its safer with a lower psi and is making the Hp or desired performance, leave it.
I would think the pt88 would love more psi to get into it's efficiency range, so I would try to shoot higher psi while it gets tuned and then run it at lower boost settings 90% of the time, so when you do want to up it a bit, you can without getting it re-tuned.
So shoot for 15-17psi. If you feel running at 14 psi is all you need, then back it down and let it live a long life. Once you get used to the power level, you will want to turn it up more, its not a fact of if, but when.
JMO
I would like to do exactly what you said and run around 90% of the time on 13-14 psi, but not have to get it re-tuned (yet again) just to run a little more boost only 10% of the time if it can be dealt with the first time around. In fact, it is more likely that I would keep it in the 14 lb range closer to 95% of the time. lol
Anyways... I do know better than to just turn it up and have good faith that everything will go smoothly.
Understood. Thank you for answering my question. I knew I could learn at least one new thing today. haha
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Personally I recommend and limit myself to 12-14 psi on pump even with lower compression but we have 110 deg days in the summer and shitty 91 oct gas. Then again when I want to beat on it and go fast I'm not going to be risking it with pump gas anyways, way too volatile and the possibility of getting a bad tank of gas just isn't worth it when I can just put in good gas and be good.
well now that you are running E85, throw some timing in it and up boost. Its liquid gold i tell ya! But you should just buy HPT and save a bunch of different tunes.. one for low boost, one for high, another for whatever you want.
Why would you run two different tunes for low boost and high boost? One tune should be able to handle both... I could see having different tunes for pump gas and race gas, but I fail to see the purpose with e85.
yeah i meant for when you switch between types of gas if you werent going E85.
mpg will be fine. I have gotten 17mpg and expect to get better on the chevelle with E85, thats on a OLSD tune with the 80e and 3.73's with short 26.5 tall tires. Stay out of the gas and shouldn't be a issue.
Just adding some information to the original topic... I tuned a 5.3 with flat top pistons and 317 heads, came out to about 9.2:1. On the same shitty 91 octane Nic mentioned, I was able to push it to 18psi with 15 degrees of timing without seeing/hearing knock. I hardly felt comfortable pushing it that far, so I didn't try any higher. Was showing low 600s hp at the track though. 5300lb truck went 121mph with some 2.garbage 60.
Just adding some information to the original topic... I tuned a 5.3 with flat top pistons and 317 heads, came out to about 9.2:1. On the same shitty 91 octane Nic mentioned, I was able to push it to 18psi with 15 degrees of timing without seeing/hearing knock. I hardly felt comfortable pushing it that far, so I didn't try any higher. Was showing low 600s hp at the track though. 5300lb truck went 121mph with some 2.garbage 60.