so i want to raise my rev limiter

[sprayed346ss]

Currently its set to 6700 but it still makes power! I think the last time i got it tuned the tuner just wanted to play it safe so he set it there. I was thinking of raising it to 7000-7100. Now should i be worried about reving it this high? I know its a gamble with a stock short block, but i want to rev the car. I've got HPT pro so i can log. But is there anything i should check out on the upper end? Timing? AFR? (im new to tuning) thanks

[eficalibrator]

...with a stock short block... But is there anything i should check out on the upper end?

Yeah, check out how well a failed stock rod bolt helps to ventilate the block.

[willyfastz]

Yeah, check out how well a failed stock rod bolt helps to ventilate the block.


I've actually seen the rist pins bend before the rod bolts broke. I've seen some broken rod bolts on toke though.

[sprayed346ss]

Yeah, check out how well a failed stock rod bolt helps to ventilate the block.
OK greg, would u rather me spend $500 so i can learn "how to tune"? Cause i was under the impression 01+ have revised rod bolts and could handle more RPM.

[sprayed346ss]

I've actually seen the rist pins bend before the rod bolts broke. I've seen some broken rod bolts on toke though.

well my motor has 38k on it, and wouldnt be spun to 7k EVERY DAY. I was curious of moving the limiter up, not spinning it that high every time i get in the car. Id prob set my shift light at 6800 and hopefully get shifts in by 6900 when im racing

[eficalibrator]

OK greg, would u rather me spend $500 so i can learn "how to tune"? Cause i was under the impression 01+ have revised rod bolts and could handle more RPM.
Lighten up, Francis. I don't recall giving you a sales pitch here. I'm just pointing out that the stresses on reciprocating components go up exponentially with RPM. There are two things that usually kill engines, knock and RPM. You came in here asking how much of one you could add and I recommended against it.

I don't care what AFR and spark you tune it to; at some elevated RPM, something will eventually let go. The factory parts were designed to tolerate a certain level of stress. Excessive RPM raises these stress levels MUCH faster than cylinder pressure increases from power adders (provided you're not getting knock). I guess you get to decide just how much safety margin you think is in the stock rod/bearing/wrist pin/piston combination...

[Goatkart]

dumb question...... but i always thought predetonation actually caused reduced cylinder pressures... but wavey looking and unstable...


i think your book actually has a picture of it greg LOL...


maybe im just remembering it wrong...

[sprayed346ss]

Lighten up, Francis. I don't recall giving you a sales pitch here. I'm just pointing out that the stresses on reciprocating components go up exponentially with RPM. There are two things that usually kill engines, knock and RPM. You came in here asking how much of one you could add and I recommended against it.

I don't care what AFR and spark you tune it to; at some elevated RPM, something will eventually let go. The factory parts were designed to tolerate a certain level of stress. Excessive RPM raises these stress levels MUCH faster than cylinder pressure increases from power adders (provided you're not getting knock). I guess you get to decide just how much safety margin you think is in the stock rod/bearing/wrist pin/piston combination...

ha.. well if its any consolation i just bought your book on amazon. But isn't the point of racing to win by all means? even if it comes to exploding your motor? My names Joseph.. FYI Greg.

[eficalibrator]

dumb question...... but i always thought predetonation actually caused reduced cylinder pressures... but wavey looking and unstable... i think your book actually has a picture of it greg LOL...
I can guarantee you that my book doesn't have any pictures of "predetonation." There are some of knock (abnormal combustion) though. ;) Look closely and you'll see that max cylinder pressures of the knocking cylinders is noticably greater than that of the cylinders in normal combustion. I only included shots of "mild" knock because I didn't want to ruin a $1,000,000.00 prototype engine when I recorded those. :icon_eek[

ha.. well if its any consolation i just bought your book on amazon. But isn't the point of racing to win by all means? even if it comes to exploding your motor? My names Joseph.. FYI Greg.The quote was from the movie Stripes. (Perhaps before your time? Definitely worth a rental instead of seeing the crappy editted version on TBS.) Regardless, thank you for the support. I can only hope your winning doesn't come at the cost of one engine per race. Be careful out there.

[Goatkart]

I can guarantee you that my book doesn't have any pictures of "predetonation." There are some of knock (abnormal combustion) though. ;) Look closely and you'll see that max cylinder pressures of the knocking cylinders is noticably greater than that of the cylinders in normal combustion. I only included shots of "mild" knock because I didn't want to ruin a $1,000,000.00 prototype engine when I recorded those. :icon_eek[




lol, are you suggesting that some of your material was gathered while doing "work related" testing ROFLOL....

none the less, your right, went back and took a looky loo at the diagram in your book.........:notooth[1