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what is the redline on the sr16ve? does anyone know?
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nissan does nto make an oem ecu that maps over 8000rpm. the redline is actually a few rpm before 8000. do not take sr20ve above 7500. there is no power there and the valetrain is different from they sr16s. dammage can be caused.
Originally posted by bigtom nissan does nto make an oem ecu that maps over 8000rpm. the redline is actually a few rpm before 8000. do not take sr20ve above 7500. there is no power there and the valetrain is different from they sr16s. dammage can be caused.
Yes, But (ha ha). I have read you say that you took your ve much higher at the strip. I have the sr20ve on the way with the sr16 cams. I assume it should be fine to around 7800 rpm or so, with a power peak around 7500-7700 rpm. Am I wrong? The redline is the only thing I worry about because the dyno will till me what the power peak really is and hence the best pint to shift (ie 200-300 past the power peak).
my peak power was at 7200. shifting 200-300 rpm past the peak is not the way you want to get the fastest times. if i did that i would be running slower. the best way to do it is to integrate(its a calculus function) the hp curve and keep the revs in the highest part of the integrated curve. this also needs to factor the percent drop in gear ratio in each shift and corrected hp and corrected integral for each gear to determine the shift point in each gear. there is a bit of thinking to do about driving better, not just haul ass down the track. if you shift too soon or too late you can loose tents fast.
my ecu is very different, and im not gonna post how high i took the thing (if you only new) but i was really lucky it didnt blow up. this was a test and the fact is there is no power up there. DO NOT BOUNCE ON THE LIMITER UNLESS IT IS AN ACCIDENT. the power drops after 7200. my rev limit is at 7850 right now. that is the limiter i ran when i hit 12.8.
steve if you want help with your cars numbers take a floppy disk to the dyno with you. ask them to put all the data for your best tuned run on the disk ane email me the data. try to get the best precision as you can....10rpm steps is better than 100rpm steps. i can do the math for you and send you back the info on what shift point is good for each gear. drive smarter run faster.
Originally posted by bigtom my peak power was at 7200. shifting 200-300 rpm past the peak is not the way you want to get the fastest times.
DO NOT BOUNCE ON THE LIMITER UNLESS IT IS AN ACCIDENT. the power drops after 7200. my rev limit is at 7850 right now. that is the limiter i ran when i hit 12.8.
steve if you want help with your cars numbers take a floppy disk to the dyno with you. ask them to put all the data for your best tuned run on the disk ane email me the data. try to get the best precision as you can....10rpm steps is better than 100rpm steps.
I will defiantly do that. I know that you can do the math with the gear ratios and figure this stuff out. I am most concerned about strapping that thing to the dyno. I want to be sure NOT to do something stupid like overrev the engine. It sounds like the 7500 is a good guide for the stock sr20ve with stock cams. Once I dial everything (timing, cam triggers) I figure I would do a couple pulls to redline. I guess that means I should do the pulls to AT MOST 7850 or so to gather the data. I know if in some of the other pulls the power is falling away dramatically to NOT bother going higher. I just don't want to blow the engine. The other thing is our tach's are not accurate up that high so 7850 might read 8000 on our tachs. Correct? That is why I was going to do a pull to 7500 on my tach, look at the dyno graph and see what it what the power curve looked like and what it said I revved. Then do a pull to 7600, 7700, 7800 etc until I saw the power fall off. Once I see that I am about 300 rpm past the peak I would stop doing dyno pulls. Does all this make sense? I really appreciate your help.
It all made sense to me. So then if nissan doesnt make a ecu that reads past 8k then when does the rev limit kick in on the sr16ve. 8k?? peak hp is at 7800 so??
"This naturally aspirated, variable cam lift and duration, hyper strung, 8500 rpm revving engine pumps out 200 hp out of only 1600ccs! It also has an 11:1 compression ratio. We figured that if Nissan engineers thought that their naturally aspirated 11:1 motor needed piston coolers, we ought to put them into our naturally aspirated11:1 motor".
That's an awesome article! Where is the next one? I suppose I can go to SCC's website.
Well, learning a bunch about how to make high compression engines happy! When my warranty expires I'm planning on someday getting into the SR16VE w/SR20DE internals swap. One day...
the best way to do it is to integrate(its a calculus function) the hp curve and keep the revs in the highest part of the integrated curve.
yes, I figured that, but in order to integrate the function (power curve) you have to know the function, the variables, cofficients and powers that describe it. How would you go about determining a function that describes your power curve?
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fastNX i learned how to do it in college. you use the more detailed data from the disk you get from the dyno. most all dyno shops can offer you this service i think. the more precise the data is the more precise the function and the integral will be. if you have a grasp of upper mathmatics and advanced statistics you should be able to figure it out. the whole thing takes about 40-50 minutes to derive a function that hits every data set. and let me tell you they are really strange functions sometimes. maybe i can find the function and let you try to integrate it(hahaha). my guess is if you dont know how to find the function you wont know how to integrate such a complex function anyway. but thats the easy part just takes 5 minutes or so. if anyone is serious let me know...post or pm me, if you feel you are really going to use it to try to get better times at the trackand you are using slicks at the track(if you're spinning street tires down the track youre not putting the power to the ground very well and it throws the whole thing out of whack), but please dont waste my time, because it takes over 1 hour sometimes.
I think its awesome that you would do that for anyone. Do you think its possible to do a write up of the calculations and how-to's to figure it out for ourselves, instead of bothering you. Hopefully some of us will be smart enough to understand the math
Just out of curiousity do you think JWT or any other company will be making cams for the SR20VE or 16VE?
right now i think general opinion is that the sr16ve cams in a sr20ve are some great gains. IMO i don't think that JWT will put out cams for a motor that there are maybe 20 of in the states....but who knows. ;-)
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OK looks like it's tougher than I thought! No im not using slicks, and i havent even had my car dynoed, so dont worry about it, but it is refreshing to learn that all than calculus I learned can actually be put to use!!! I'm starting university this september, going heavy on the physics, maybe i'll learn it there
no there is no how to or DIY for the calculations available from me. i am willing to help anyone running slicks regularly, and dynoing thier car, and who is serious about racing and driving better.
more gains are on the way for my car. should be low 12s in a few weeks....maybe high 11s.
I know this won't be as accurate as using the HP curve in 10RPM interval but if someone who don't want to go through the calculation and just want some rough estimate, here's a site that has it in 1000RPM interval.
