Disregarding the head, how high can a stock gsr block rev to reliably? Anyone here with cams and raised rev limiters please let me know your experiences/problems.

 

You can't disregard the head...but to answer your question I believe that any increase of the stock redline will also increase engine wear. This assumes you actually rev higher of course. That said if your engine breathes well enough to make power that high then it might be worthwhile to rev to 9k. Mine is currently set to 9.3k, though the dyno showed my peak hp around 8800, so I'll either lower it with Hondata or use a soft limit around 9k.

 

the key is mostly in the head.

more revving = more wear

the main reason to increase redline is if you'll make power up there.

 

I take mine up to 9k at times

 

The reason why i said "disregarding the head" is because my head is built to handle the higher revs. If i make power to say 8600-8800, would it be wise to set my rev limiter at 8800?

 

Just set it to 9k if you rev it to 8800 rpm.What cam set up do you have may I ask?

 

Toda B. I'm thinking it will probably peak around 8500, but i won't know til i get it tuned on the dyno.

 

Yeah 9k is fine. I'm favoring a 9k rev limit on the Hondata/P28 and a 8800 limit on a digital 6 MSD. Sounds good bro, good luck.

 

well over 10k. When I missed a shift the tach jumped way up there. I bent valves, but the bottom end was fine, no sign of abnormal wear. Limiting factor is valve float.

 

I see. Well you also do have an ITR block. Slightly different then the gsr block because you have lighter/stronger rods and your bearings are different too i believe?

 

that is one time by accident. he was asking how high it can rev to RELIABLY. insert hammer here I plan on revving up to around 9k daily driven, on a stock block. (jdm b18cR) no need to rev any higher...maybe not even to 9k. wherever the power peaks at .

 

Yeah reliability is key here. For a daily driven car, would 8.7k sound safe for a stock block (gsr)? I know a few you guys have already said you hit 9k a few times. Well i don't know if its just me, but every now and then i like to have fun with my car, and i punch it to redline through 1st-3rd gear. I want to beable to do the same thing when i get my car hondata tuned with a raised red line.

Sorta OT, but does the Hondata S200 have a built in shift light like the previous Stage 2 did?

 

Yes the stock b18c1 can handle the occasional romp to 9k. It will increase wear however.

Nope.

 

*just a thought*
wouldnt you wanna rev a little past your 'peak power' so when you get into gear and step on it again youll be in a beefier part of the power band...?
example:
peak hp is at 8.1k
(depends on the power curve but)
rev to about 9k
(i doubt this is accurate..also depending on gear your in)
when your back in gear (lets say) 7k
then yourll be closer to the peak and itll pull harder then if you were to shift at 8.2k and end up at 6k.........but at 6k youll still be inVTEC and its a lower rpm and a little more torque..so it probably pull down there too...hmm...let me go test my car a little and ill get back to this....



[Modified by 10K2HVN, 3:22 PM 2/16/2003]

 

Great, thats what i was hoping to hear. Just as long as i don't break a rod or something terrible.

 

The rod bolts will be under tremendous stress at that RPM. If you plan to do this routinely then at the very least get some ARP rod bolts. The GSR rod bolts are strong, but they're not intended to live at 9k.

 

How labor intensive is it to change the rod bolts?

 

even if that were true, the extremely minimal gain would not be worth adding any more stress to your motor.

 

if your peak power was at 8.1k, and you shifted at 9 just to be at a higher rev in the gear that you shift to, i would think, depending on the setup of the engine, that you would be slower than if you shifted a little past 8.1k and started back at say 6200. if your peak power was at 8.1, but you didnt make barely any power past it, then your car would stop pulling hard after 8.1 up until 9 when you shift. whereas if you shifted just past 8.1, your revs would fall to a point (say 6200)where they dont pull as hard as they do at 8.1, but your engine would increasingly pull harder up until there. does that make sense? thats just my theory.

 

hmm..heres a random dyno that i got from http://www.importreview.com

..peak power is 7.9k-8.1k rpm
..dyno stoped recording at 8.5 but if power were to keep droping at that same rate..power should be about 154hp at 9k
..now lets say a gear shift is 2k rpm drop...
..if your were to shift at 8.8k which is about 164hp (if power were to drop at the same rate)
..then that would land you 6.8k (on the next gear) at 164hp
..wouldnt that be better then to shift at 8.3k 175hp and end up at 6.3k which is 151hp
..espeacially after a gear change you decelerate quite a bit and wouldnt you want more power to get you going again...? this would be more like driving your car according to your power curve (if you wanted to win a race..not for reliablity) to try to stay closest to the top of the hill of your power band..if you would consider your power band to be a two-dimentional hill.........

 

The old drag racing adage is that you want to shift at peak power and end up at peak torque.