I was told by my tuner not to go much over 400 whp on pump gas as you run the risk of detenation. I understand the need for race gas, but my question is this; If I make the set up more efficient, say swap my intake mani and cams, why would there be any problem making more power on the same amount of boost?

Another question, and just something I thought of. If your at the point of needing to run race gas with a smaller turbo and xxx amount of power, is it possible to run more power with a bigger turbo on pump gas? I would assume yes, because the air being compressed in the bigger turbo won't be as hot as the air comming out of the smaller turbo at the same power levels. This is just me guessing though, so hopefully some of you pros can chime in. Sorry if these are noob questions, but they are questions I don't know the answer to.

 

Bump.

 

yes and yes

its really up to each owner and tuner and what they are comfortable with

if your tuner is only comfortable with 400whp probably because he doesn't think the risk of ruining a motor is worth more than 400 especially on the street....400 is plenty for the street IMO
it also probably has to do with what all is done to the motor before he would be more comfortable with tuning for more power on pump gas

 

I agree it's up to you and the tuner on what you both feel comfortable with. I always heard the good rule of thumb 150wtq/liter = safeish and 175wtq/liter = pushing the limit.

 

i know to be safe on stock rods of b series motors you want to stay below300 wtq not sure about the rest of the internals and what whp or wtq

i think the amount of torque you have has more to do with how long a stock motor holds together

 

475 tops. I think street gas can handle power better now a days with it being 10% ethanol.

 

I agree 400 for the street is just fine, I am just curious as to why some tuners would want to stop making power at a certain whp vs. Another whp if the car could take it. When I went to go get tuned a while back, my tuner asked me what I was hoping for. I told him to tune it untill he couldn't make any more power safely. He told me not to go over 400 whp because I was only getting tuned for pump. He tuned me to 400 and that was it. I was under the impression that the car would let the tuner know when it was time to quit, not you hit this target whp and that's all. Especially with all dynos reading differently, 400 on one could be 375 on another and 415 on some other one. I figured the tuner would read the afr, iat, egt, Spark plugs and such to figure out how far to push the car safely.

Although 400 is just fine, like always, more power is just fun and I would like to see power gains from the mods that I put on, not just decreasing the amount of boost to hit the whp I'm already at. My AVCRs boost by gear works pretty well at controling my wheelspin (running Hoosier 225-50-15 drag radials full time doesn't hurt either) and I feel I could run a good amount more power in 3rd and 4th so I'd like to have more power if I'm able to.

 

Just really depends on how comfortable the tuner is like people have said. Pump gas is never the same so you just have to be conservative. We just did one 507whp on a dynojet on 93 octane and 19psi. Just the basics 6262, 2.0L LS/VTEC, CTR cams, AEM Series 2 low timing.

 

Made 530/360 here on my old setup, 18psi pump gas t3 t67 ho!

 

Pics? Vids? Also at what RPM was this?

 

I made 515/310 or so on 15lbs pump gas s372r, had to stop there because boost solenoid was acting up. Car was loving it though, was shooting for 600.

 

I wanna see some graphs!

 

making 522 on 20psi with S362 turbo. stock sleeves, nippon cast pistons 93 pump gas all day long..

 

I still want to see some graphs. Hitting a big number is great and all but a "One hit wonder" of an engine doesn't make the greatest street car. If you've posted or are going to post your power levels please mention at what RPM you made said power and include a graph if possible.

 

IMO no matter if you making 700+whp or not, still think 420-440whp is perfect for pump gas on the street.

 

What do you mean by one hit wonder? I made my peak power at 9k, it is a very linear power band which is to be expected with the large turbo, it does however outspool my old 57trim setup on my b16. I get 5lbs by 4800 wastegate opens at 5500 at which point I have 13lbs and it creeps to 15lbs by redline. The only reason we stopped was because I had the wrong boost solenoid. One pull it would be 12lbs and the next it would spike 20 by 5k rpm and we'd let off.

This is the only pic I have from my iphone and I have no idea how to rotate it.

 

Stock Type R motor with Rods and Pistons. powers on 20psi... did a couple pulls. same power everytime.!!

 

The better question to any of these people making high power on 91/93 octane is, do you actually run your car under those conditions or do you just do it for ***** and giggles on the dyno?

I bet more often than not, they lower their power to 400whp on 91/93. On a rare occasion run that high hp on 91/93, and when at the track, probably throw 100+ octane in the tank to be safe.

 

I can't make any less power than that so yeah I drive it all the time at that level.

 

Well I just meant in terms of having a smooth power band of course versus your power coming on right at some high RPM and a short range. It's all relative to spool and building boost of course.

Thanks for the graphs guys.

 

Thanks everyone for the input. I'll just keep doing what I've been doing and we'll see what happens.