QV rev limiter

Whats the stock redline? 8500 seems awefully high for a 20 year old motor. Did you mod it?

 

If it has one is integral in the Marelli ignition box.

 

With basically a stock 308QV engine, while you can rev it up to 8500, you will not be making any more HP. There have been several dyno sheets posted here, and from them you will see the HP dropping off after 7K (if my memory serves me). Ckeck it out before you make any changes. Running the engine up to 8500 may not buy you anything expect a worn engine.

 

If it only makes power to just over 7k it would be pointless to rev to 8500, you wanna shift about 500 rpm after peak power

 

Unless you were racing the car and you didnt want to loose time having to change gear just before a corner..........please read all the posts its already been explained why the need for a higher limiter

The rev limiter is set by the control box's, if I get time I'll open up a spare and look for anything that can obviously changed....far easier with gt4's where you just have to "modify" the spring on the rotor arm

 

The Euro 308 here appears to have no limiter, and i KNOW the feeling if there was one. There is a section on this track i regular... same thing per se. Have to rev high on a downhill before a turn, hard brake, almost a u-turn to then go uphill. To shift up would mean shift up, fast brake soon thereafter and shift down to be back in rev range for the uphill. So that would be TWO 'extra' shifts just to do it without rev'ing high in third and be in third for the uphill.

Kill the rev limiter. Another option is to get straight cut gears and have fun regearing the car...

FYI for those curious. Below image shows the NHIS Loudon, NH (US) track and it is turn 6 specifically. From turn 5 to 6 is a downhill with turn 7 being uphill (a bowl in total as it were). Have tried going to fourth between turns 5 and 6 and stay there, but the 308 lacks torque and dogs out going to turn 7 (the uphill). This is with street tires (Mich Pilot Sport PS2) and with the coon to be mounted Mich Pilot Cup R-compound will see if i can get high enough grip to upshift to 4th between turn 5 and 6 and keep enough speed to swing her around and up to turn 7. Have seen various cars try going too fast and just shuttle off into the tire wall about 50 feet or so away past turn 6 as there is mainly loose gravel once you are off. So no 'real' grip (tarmac) before the wall if you go off.
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Would love to hear about it! If you have a track map to post that would be great too. For others, have edited a video of only turn 5, 6, and 7. In the beginning i am shifting from 2nd to 3rd gear.

http://www.ispexperts.com/nhis567.wmv

NOT to hijack (my apologies but trying to also prove your point walclare) If anyone has input i am all ears. Have tried various ways to take this 'bowl.' Please keep in mind this is with street rubber, am sure the R-compound will allow for faster entry/turn grip/exit speeds so will experiment accordingly on Thursday April 27.

 

My '83 euro has a limiter, (I found out by accident or being brain dead).

 

My '82 Euro QV has the $#@$%! @7600 rev limiter. Think it must only be on the early QVs.

Wouldn't mind it's protectoin except that it kills the ignition for several LOONNNGGGG seconds when I accidently bump into it.

Long enough so that when power returns, engine RPM has dropped way down, I've completed the shift into next gear & am still w/o power.

Annoying as heck if I've accidently tripped it on a down shift & need to power thru a turn, or have just come out of a turn & am trying to accelerate ...

It also seems to have a hair trigger. If I decide to upshift at 7000, by the time I can get my foot off of the throttle, I've tripped it (i know, i know, ageing reflexes ).

My Rx7 TurboII has a much better one, Gives a warning buzz before it cuts in. If I get off of the throttle as soon as I hear the buzz, it doesn't kick in. Downside is the Rx7 one works by killing injection to the front rotor, so you're risking detonation by running lean. One detonation at just the wrong time & you're rebuilding the engine.

 

Wow! Wish i could help but it is the way the car here came. Next time we are together you can peek inside the boxes if you want. i KNOW she has seen 8+k rpm here and there during straight acceleration... All i have seen are the outside of the boxes when i went to do the added grounding strap 'trick,' and saw the P.O. did it already.

 

My '84 USA model does not have a rev limiter...

 

Wow, hill climb looks like a blast. We used to have similar events in America in the 50's. I'm sure something to do with liability killed them.

I bet those hay bails against the trees and houses really work.

I don't recall ever hitting a rev limiter on my '83 308. Not that it did not have one, but reving north of 7000 and shifting I would think I would at least bump it??

 

Was yours an Euro or US?

Hmm, maybe we can bracket the build #s that had it.
My # is 43825 built in Oct '82, what was yours?
Chris Morse yours?

 

walclare,

Thanks for posting pics and details. Am familiair with hill climbs, but in America we have things called lawyers and liability laws... and so went such tings as public roadway hill climbs it seems.

WOW, pic 2 looks like fun, but if you go wide (right) the road just washes away offcamber it seems. STAY TO LEFT for sure! Wishout being there, driivng it (best bet) or at least seeing a video it would be hard to really *know* what to do. Guess you choose like me, stretch the gear out.

Have VAST DATA on the K-Jetronic system, large books from Ferrari with MANY service bullitins, parts book, etc, but no schematic of the control boxes.

i do see a "electro-valve for cut-off valve" in the Ferrari electrical diagrams. Will attach it here. Really do not see much else in my books that would add to this. Sorry
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