Gents,
I'd like to hear a few opinions...
I'm heading to my buddy's dyno shop in the am. The plan is to get a legit number on pump gas without tire slip. Last time, the drag radials were heating up and started to slip as soon as the car broke the 550-575whp mark.
This time I'll be running regular street tires, which will hopefully hold power and allow for a cleaner dyno pull.
I plan on doing a few pulls, one at 15, 18, 20 and 21-22psi on pump. Then, I'd like to do a few pulls with 100 octane. What's the max boost/whp you guys recommend with 100 octane?
Thanks,
Ryan
OLD
E30
636whp
1/4 mile: 10.91@144.38
http://www.youtube.com/watch?v=L_f7fUVqblI
NEW BUILD
335d
520whp
635wtq
120.51mph trap speed
It's hard to choose what is safe, because you don't really know until you get there. How big are the fans on the IC? How much CFM? Are you monitoring IATs? There are a ton of factors of what is safe on the dyno.
For reference, CES ran 27 psi with 100 octane + meth on their GTX35R car. I'd say 25-26 psi for sure no problem. Much above that, who knows?
I hit 28 psi on the dyno at peak torque with MS109 and no issues (101 motor octane)
What fuel specifically are you using, and will it be mixed or straight?
-Mike
IG: @mikevanshellenbeck
There are multiple fans. Not sure the CFM, although very high hp cars dyno/ are tuned there daily... I'm going to place an IAT probe post MAF and pre TB. I hope IAT's aren't a problem now, especially since the car has the 4" core. I'll be running the 93 octane that's in the tank, prob 4 gals total. After the pump gas pulls I'll either run the 93 out or pump if out. Then I'll add 5 gal of Sunoco 100 octane and turn up the boost.
I'd love to break 7's with 100...
Anyone ever bend/break eagles?
Last edited by futureroadracer; 12-14-2012 at 09:11 PM.
OLD
E30
636whp
1/4 mile: 10.91@144.38
http://www.youtube.com/watch?v=L_f7fUVqblI
NEW BUILD
335d
520whp
635wtq
120.51mph trap speed
How's the SOHC compare to the DOHC?
OLD
E30
636whp
1/4 mile: 10.91@144.38
http://www.youtube.com/watch?v=L_f7fUVqblI
NEW BUILD
335d
520whp
635wtq
120.51mph trap speed
Straight 100 Sunoco, crank it. Your turbo will support 700 easy.
If you're already running that much power and 22 psi on only 93 octane, I'm sure you can run 26-28 psi for sure on straight 100 (assuming IATs are in check at that power level)
Which specific sunoco fuel is it? What's the motor octane?
-Mike
Last edited by MikeE36; 12-14-2012 at 09:49 PM.
IG: @mikevanshellenbeck
Yeah, gotta watch MAF voltage...
-What IAT does the ECU pull timing?
-What is considered "in-check"
Honestly, I'm not sure what the motor octane is. The Sunoco station near my house has 100 unleaded and 110 leaded at the pump. I also have access to URT Advanced, which is 105 motor octane.
OLD
E30
636whp
1/4 mile: 10.91@144.38
http://www.youtube.com/watch?v=L_f7fUVqblI
NEW BUILD
335d
520whp
635wtq
120.51mph trap speed
I'm not too sure how the stock ECU works, but there should be a compensation table for X number of degrees IAT it pulls Y degrees timing. I don't know what temp is the lowest value.
I'd say "in-check" as in as low as possible. Maybe 110-120 F max. 150+ F and you're most likely in trouble. Drifting IATs are usually the worst around Ambient + 60 F, so 100 F day, 160 F IAT. Shoot for 110-120 or less if you're trying to go for big power. The lower the better. Ideally you'd have like 60-70 F or something on a cold day for the glory runs.
Higher the octane the better also, leaded or not when going for max power. 110 leaded would definitely give you some head room
Also, your torque is fairly low relative to your horsepower, (as is with big turbos usually) so you really have a TON of head room on the table. Only 488 ft-lbs on pump gas isn't really that big of a deal, but the horsepower up top is great due to the larger turbo. I'd say 600 ft-lbs on any of those fuels isn't unreasonable, and that would be 750+ hp.
Use the 110 and crank it
What was your peak MAF V on the 636 pull? What does it do at 22 psi? How much head room do you have?
-Mike
Last edited by MikeE36; 12-14-2012 at 10:53 PM.
IG: @mikevanshellenbeck
700whp or bust
150+ in the 1/4
RK tunes
^yea!
Yeah man, I'm tracking most of the info you posted. Just not sure why the IAT temps that everyone references is still such a mystery. Maybe the ECU doesn't do anything until 180* IAT's... especially if fuel quality is there. Who knows man.
My torque is not low, it was the dyno. Very small dynojet. The car has made 530ftlbs on the load bearing dyno and then is fell due to wheel slip. Torque will be higher as long as the tires don't slip...
I don't think I have enough timing to run 110 either. When I was running the URT, the car was falling on it's face until 23ish and I still don't think it was optimal.
I am all but certain she'd go 150+ with the 2.93's and the small intercooler. Car is so much faster now with the 2.93 gear.
Last edited by futureroadracer; 12-14-2012 at 10:44 PM. Reason: Automerged Doublepost
OLD
E30
636whp
1/4 mile: 10.91@144.38
http://www.youtube.com/watch?v=L_f7fUVqblI
NEW BUILD
335d
520whp
635wtq
120.51mph trap speed
I can't imagine it doesn't pull timing substantially earlier than that. Cars feel MUCH slower heat soaked than not, even in mild cases, and IAT is no where near that high.
I was just saying relative to horsepower, torque was low. My car doesn't make very good torque on a dynojet either. My road dynos show 590 + ft-lb, while the dynojet shows 490 ft-lb.
Either way, you've got head room.
-Mike
IG: @mikevanshellenbeck
I was not speaking literally. I was merely making a point... No one has posted the IAT tables nor has anyone shared any info... we all just assume arbitrarily. We all understand the effect, we just don't know at what temp or it's impact on fuel or timing. I wish I knew the significance and at what point. Ya know?
The dynojet I went to is weird, it's really small and didn't load the turbo enough. There is another AWD DJ that is very nice. I believe its load bearing too. I may hit that eventually.
Last edited by futureroadracer; 12-18-2012 at 11:48 PM.
OLD
E30
636whp
1/4 mile: 10.91@144.38
http://www.youtube.com/watch?v=L_f7fUVqblI
NEW BUILD
335d
520whp
635wtq
120.51mph trap speed
I don't think I've ever said this before. But i <3 your car. i think you know how to have lots of fun with your car and beat the piss out of it.
but Dynojet shows "comparable/standard" numbers.
Use the "gear ratio" on a dyno jet run file. too see if the tires are blowing off on the dyno and load it up with weight to get them to stick so you can get some true comparable wtq numbers.
Not saying your car doesnt make more torque then its showing. i just want to see how much you can lay on the rollers with perfect traction in comparsion to you dataloger.
RK tunes
i read that obd 1 ecus dont pull timing with iat.
Ecu pulls timing with coolant temp.
is it true?
Good luck today sir, hope we see some awesome news this evening!
~Ken~ '99 M coupe THE "original" TT Stage 3 - HTA3586R; 701 whp 672 wtq @ 26.5 psi ; NeverSell - CoupeCartel
My buddy canceled on me. Sorry for the delay, I'll try and reschedule something for this week.
OLD
E30
636whp
1/4 mile: 10.91@144.38
http://www.youtube.com/watch?v=L_f7fUVqblI
NEW BUILD
335d
520whp
635wtq
120.51mph trap speed
Ahhhh! what a tease! I'm awaiting the dyno results of your larger IC and Dadx2's 4" exhaust install to see If they both allow for big gains!
OLD
E30
636whp
1/4 mile: 10.91@144.38
http://www.youtube.com/watch?v=L_f7fUVqblI
NEW BUILD
335d
520whp
635wtq
120.51mph trap speed
Nooooo!!! Oh well I am sure you will set it up soon.
~Ken~ '99 M coupe THE "original" TT Stage 3 - HTA3586R; 701 whp 672 wtq @ 26.5 psi ; NeverSell - CoupeCartel
Yeah, it sucks... mtf though.
I do have some data though, so my boost controller has been reading 1.5-2.5psi high. So, when I've been figuring out my max boost pressure, I've just been using the profec's max boost recorded function. So, today, I figured I'd see if it's actually spiking etc. Sure enough, on low boost the gauge hits 17-17.5 and immediately settles to 15psi. This is pretty significant because my 636whp pull was at 22psi off the boost controller. So, in reality, I probably made that number @ 20psi or so... (with the small intercooler)
I suspected this was happening though, since the boost pressure wasn't matching my buddy's dyno. So, now I have to adjust the EBC settings and turn the boost to a true 22psi... Luckily I just ordered a 0-30psi boost gauge, which should make targeting boost pressure easier.
I'm pretty excited since my WHP/PSI numbers have been off...
Last edited by futureroadracer; 12-15-2012 at 11:30 PM.
OLD
E30
636whp
1/4 mile: 10.91@144.38
http://www.youtube.com/watch?v=L_f7fUVqblI
NEW BUILD
335d
520whp
635wtq
120.51mph trap speed
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