limit rpm

[nestoledo]

Somebody knows to where it is safe to up limits of rpm with ecuflash. maybe 6.500 - 7.000 rpm on 4g94 turbo'ed at 8 psi

[ambystom01]

Stock is 6500 already I think. There's no point in raising the limit since power drops off in the higher RPM range.

[cincy]

He is boosted not NA. Even a t28 is still making power at 6500 with only 8psi. Now if it was running 20psi, it would be dropping off like a mofo before 6k. There should be another 750-1k of useable power with a 16g at 8psi

[nestoledo]

ok! thank you, i will try up to 6.850 ( the stock is 6200 ) to see if boost still making power

[ambystom01]

Would the stock head become a restriction at the higher RPMs (ie. it can't flow enough air to continue making power)?

[cincy]

dont know the cfm of the head but the cars are still making power when they hit redline. Plus if you dont raise the rev limit, you cant run larger turbos since you wont have a useable powerband. If people port the head and add in a large plenium intake manifold there is way more power to be had and still at a moderate boost level

[Complink]

is it safe to increase the the rev on a stock g94 since it a sohc?

[ambystom01]

Originally Posted by Complink

is it safe to increase the the rev on a stock g94 since it a sohc?

There's no point stock since power plummets after 5000 RPM.

[Complink]

torque might but power doesn't till usually after 5500. but thats N/A and im turbo. i'm not necessarily concerned with loss in power but with the limits of a sohc vs. say a dohc. basically i'm wondering at what rpm will the safety of the cam and head be jeapardized (sp?), since dohc can be revved higher safer.

[ambystom01]

The problem isn't the fact it's SOHC, it's more a matter of simply not being able to flow enough at higher RPMs. I think the RRM reflash used to increase the rev limiter to 6700 or so.

[cincy]

The amount of cams doesnt play any role in how high you can rev, that belongs to the stroke length and the valve springs ability to handle the revs. Also the head will only limit the power gained, not the ability to still have usable power. I would talk to Rock @ rrm and see what they know there. Even if you can gain 500rpms, that could be a difference of 20whp for some people that are using larger turbos whos hp line is still going up when it hits the redline or just a longer powerband for those running a turbo since the are still holding 8-10psi easy.

[ambystom01]

I'm pretty sure 500 is possible since the RRM reflash used to raise the rev limiter to 6700-7000. After that i would think you'd need to upgrade the cam, valves and head or at least it would be a very good idea.

[Complink]

Originally Posted by cincy

The amount of cams doesnt play any role in how high you can rev, that belongs to the stroke length and the valve springs ability to handle the revs. Also the head will only limit the power gained, not the ability to still have usable power. I would talk to Rock @ rrm and see what they know there. Even if you can gain 500rpms, that could be a difference of 20whp for some people that are using larger turbos whos hp line is still going up when it hits the redline or just a longer powerband for those running a turbo since the are still holding 8-10psi easy.

cool thanks

[ambystom01]

7K Rev Limit ECU questions

[cincy]

Originally Posted by ambystom01

I'm pretty sure 500 is possible since the RRM reflash used to raise the rev limiter to 6700-7000. After that i would think you'd need to upgrade the cam, valves and head or at least it would be a very good idea.

You keep talking about head flow and not what makes the revving possible. The cams and head work will most deff pick up power in the mid to high rpms, but new springs should be all that is needed to rev higher. Not sure if someone is making upgraded springs and retainers with decent valves yet, but once they do and these cars can reach the 7500-8k redline, 300-400whp cars will be starting to pop up often

nice find on the redline also