This is in relation to some conversations I've had with GsuJeff, dsm95hybrid, and some of the Orlando crew (Aerocomp dyno) and was originally posted on our Dc Evo board...

After receiving Stinkapuss' dynographs and doing some analysis (not much to it, really), I wanted to share the results, since I think this will all be very useful to others...





1) Stinkapuss mods - Cone filter, 264/264, MBC@21, Mail-in Flash, SAFC2, 2.5" DP, 2.75" cat-back, 3" TP, Walbro 255, MR DV, 93oct (in September)
2) Warr mods - K&N panel filter, MBC@21psi, SAFC1, 3" cat-back, MR DV

Notice how our curves are almost identical except for his torque jump at low rpm, which gives him a big peak TQ difference, but then the hp/tq curves the rest of the way are within 20-30 for the most part. Also, his AFRs are more conservative, which is good for safety on the street and for avoiding timing pulls in hot weather. I tuned to 11.5 across the board, but didn't see an increase in power...just a smoother hp/tq curve that was much flatter than before, so the power held longer without dropping off.

At this level of modding and HP/TQ, I ran 107-108 traps (282whp) and Stinkapuss ran 111mph traps (315-320whp). On unleaded 104oct and increased boost (22-23) with aggressive SAFC tuning, I got up to HIS mph (111), which I had assumed was ~320whp. These dyno comparisons help to support that theory. Also, Stinkapuss went on to add 104oct and did the same thing (increased boost while removing fuel with the safc) and picked up 3-4mph in the traps (114-115), which would indicate a 30-40whp increase just like me. This would put him in the 350-360 range when tuned on race gas, but he doesn't have a dynograph under those conditions to prove that final part of the theory.

 

Nice comparison. Still, trap speeds involve a lot more than that peak HP number. Area under the curve and torque on the low end.

I bet there are plenty of outliars on this theory to say that there is more than a 30whp difference in one persons 112mph trap and another persons.

Also, i am a firm believer that each and every track is different....even if they were only 2 miles apart on the same day....still isn't A to A comparison.

For instance, Evil dylan, he traps 117 on 290 DD whp. It took my car atleast 315 DD whp to get that trap. For several reasons, one being driver, two being the track, three being the weather.

BTW, we dynoed on the same dyno, same calibration.

 

Yeah, you're definitely right about there being more factors than just what I listed, but what I posted is still good for a theoretical baseline. I ran my times at 3 different tracks in a 100-mile radius in the same conditions as when I dyno'd. The other car ran at local tracks, too, so I don' think those particular factors are coming into play.

I think the biggest factor is the PEAK hp/tq that everyone claims. My tq curve has no major spike when it peaks, so it appears as if I don't have good torque, whereas I actually have a nice, solid torque curve that stays flat right near 250 for a few thousand rpms rather than falling off directly after peaking like you normally see. Similar with my HP...it just steadily climbs and doesn't really spike, although I do have a spot after peak hp where the ECU pulls timing for a moment...that seemed to happen on every run combined with a puff of black smoke (weird, but it happened to all of us).

Are you sure Dylan hit 117mph traps on the same setup/conditions as when he hit 290 on the DD? You said you only hit 109mph on the 290whp DD setup...I don't think there is anyway to account for an 8mph difference there. I also don't think you'd go from 109 to 117 with a 25whp increase on the DD. Those numbers didn't make sense...

 

hey, thats what i said too.

i even lost a dollar through paypal on that deal. I dunno how he did it, i without a doubt believe he is making much more power than that. Smoggrunner ran an 11.96 @115 with a 1.65 short time on 332whp on a DD. I haven't dynoed the setup i ran 117 on, but i would say atleast had to be near what he dynoed.

I really don't understand the Dylan thing though....but he had someone from Dyno4mance vouch for him....and i don't think a buck was worth lying over. I dunno

 

Hmm, well Smogrunner's numbers look much more accurate. I don't know the details of the $1 bet or exactly what was going on when he dyno'd, but I would definitely not expect Smogrunner and Dylan to run on the same DD back-to-back, then go hit 115/117mph respectively after dyno'ing 332/290. There is obviously a big discrepancy in there somewhere, and all signs point to Dylan.

I find Smog's 11.96@115 quite interesting. How do you feel about my 12.22@109.19 on a 1.75 60' (vs his 1.65)? I am using it as proof of the advantages (up to 110) and disadvantages (after 110) of the 6spd. If you give me his 60', I would be right around a 12.10 at just under 111 (109 was from letting off when I hit the rev limiter). I don't think another 4mph would be needed to hit 11.96, yet Smog drove quite well...

 

well, his was actually 114.xx(not sure what the xx was). I think 9 times out of 10 1 tenth in the 60' equals 2 tenths at the end. ALSO, his quicker short time probably hurt his trap some.

I do feel that i should be running atleast 11.8x with a 117 trap, but, now that i have these new tires and the stock clutch is gone.....i should be able to dip into the 1.6x short times bringing my ET into the 11s, but my trap slightly lower as well.

My guess for my next trip out to the track is 11.89@116.5

But, who knows....

 

as a secondary data point, my evo8 went 114-115mph mph traps speeds very consistently with 351whp on 4wd dynojet. my AEM EMS logger shows between 340-355whp during these 114-115mph passes.

 

Excellent! Those are right on the money...