carloselpavo

I have a Daily Driver 97 civic hatch-back with a JDM B18C-R complete swap. I went to run the ¼ mile 2 times; a year apart from each other. Both times I got the car dyno tune with different tuner each time. The first time (old stockish) set up made 187whp & the new set up 210whp that is corrected numbers. Times on the ¼ mile were:
187whp 14.5s@98mph 205/40/17 street tires @15psi launch @2500rpm no preloading
210whp 14.2s@94mph 22x8x15 mt slicks @10psi launch @8500rpm preloading


Old set up was: Skunk2 pro IM,68mm TB, 2.5in exhaust & magnaflow cat, 310cc RC injectors,3in cold air, act SPP 6 pad unsprung clutch, fidanza 7.5lbs flywheel, koni yellows & grown control coilovers 500F/400R suspension, walbro 255 fuel pump, everything else stock. Compression cyl. 1-259psi, 2-258psi, 3-257psi, 4-260psi


New set up: skunk2 pro1 cams with pro series valve springs & retainers, basic head port, new valve guides, seals, piston rings, crank bearings, RMF copy header, 2.5in test pipe, competition stage 2 clutch, everything else stayed the same as the old set up.

My question is: how is it possible that with more whp & slicks it run less mph & barely a better time?

NAH2B

slicks = better traction

better traction = lower mph

95dxsir2

wieght also, are you a hog?
you would think hype-r alone would break 13's
i ran 14.39 with drag radials stock b16

carloselpavo

what about the time? I went .4s faster with 23whp more & slicks

DC5TypeS02

this

carloselpavo

I weight 220lbs and that was my second time at the track so I do not have too much seating time

lohatch

you went faster because you were making more power and getting better traction. keep working on the ET.

SonicRacing1

210hp you should really be in the mid to low 13s i went 13.7 with 190hp 140tq on 22" slicks many summers ago sumthing is not right how much does ur car weight

logic factory

op
the correlation that "more power= less mph" will be inaccurate most of the time; gearing and power band can provide some of the exceptions.

op can you post up the time slips from both trips to help us better assess what may have gone wrong?

this is incorrect.

30psi_gst

Not always true. Most turbo cars going from street radials to slicks will pick up some MPH because they spin for so long and so violent. But even stock FWD cars can pick up MPH.

My car completely stock H22 swap minus a header that was cracked on every runner i might add(no downpipe part), ebay intake and a muffler. Stock cat, stock exhaust piping, stock resignator.

2.3 60ft 9.202@79.46mph

Slicks same setup.

1.82 60ft 8.58@81.22mph

This is 8th mile times.

carloselpavo

this are the two best times from the second time at the track. I do not have the first time slips but what I remember was:
60ft- 2.6s 1/4mi-14.5s@98mph

reaction360

I really don't think you should be comparing the numbers made on those two dynos, one being a dynojet and the other an old mustang dyno.

Cimburke23

plain and simple, your car is NOT making more power than it used to. dyno #'s dont really mean a whole lot, its just a number game really. have you had the car tuned by a reputable tuner with the new setup? the old setup was somewhat stock with bolt ons so tuning wasnt as big of an issue but with the mods you have now, a good tune will make for a big difference

Honda Bull

1. I wouldn't compare the dyno runs you had made a year apart, with a different tuner, on a different dyno.

2. I checked the almanac for your race conditions. You raced in 70% humidity. When was the previous run made when you went 98 mph?

3. Regardless of what the dyno read, you weren't making more actual power, or the trap speed would show it.

sleepinonacreeper

22's have hurt my mph bad in several of my cars. i still get good et's because the slicks do hook and make the car quick. the terrible 60's are from launching at 8500, thats way too high for that slick. i've never run 22's on 15's before but im at 8.5 psi and 6500rpm with a little clutch slip off the line and i go low 1.7's on 22x8-13.

NAH2B

LOL you obviously dont spend enough time driving at the track

NAH2B

your et dropped because of your 60'

less traction will give you higher mph w/ slower et

better traction will give you lower mph w/ quicker et

you said the street tire pass was 2.6 60's correct, well there you go.

that shows you were spinning your *** off then the slickes dropped you down to 2.0/1.9 = quicker et w/ less mph because you hooked up better

obviously there are alot of other variables such as 2 different dynos, weather and track conditions etc.

95dxsir2

true nah2b. try for a 1.6 60ft. this will help you out alot.
what are you launching at?

logic factory

op thank your for the slips. the da on that first pass was ~ -111ft below sea level and the second pass was ~ 166ft above sea level.
is there any chance you can find out what day you went to the track last year so we can compare the da's before moving forward.
here is the website i used for the data i provided above
http://www.dragtimes.com/da-density-...alculator.php?

i applaud you for asking the questions you have; the answer is more dynamic than many would like to believe. continue to be skeptical and always consider the source of information. if your mind is open there will be someone willing to enlighten.

SL0WEGG

I'm gonna guess you aren't making as much power as the dyno states. I made 196whp and ran 12.9@105, car weighs 2325ish with me in it. The only definite way to tell if you made more power is to take it back to original tuner. But you still have the variable of different day different conditions. I'd say something is def wrong here. But as nah2b said, mph drops when you get better traction.

carloselpavo

I went to weight my car today and it weights 2586ish with me in it. I am going to do some dyno runs on the first dyno in two days. I understand that is not the same day & conditions, but at least it will give me more info. to see where I'm at

logic factory

op
sorry for taking your thread off topic but this is in the best interest of helping the community

perpetuating preposterous information on a rudimentary concept is not in the best interest of the community and makes those ignorant lose credibility in the eyes of those with reason.

the notion that, lack of traction will net better acceleration should spend a little more time in the frontal lobes before its repeated again; think about it.

so how could so many people adopt this nonsense? id venture a guess and say it was started by the old drag racers that would put taller slicks on their cars to gain traction. when they passed on the advice that the slicks helped with traction the neglected to mention and/or consider the gearing that changed by using the taller tires hence the lower trap speeds. this erroneous correlation of lack of traction equates to better trap speed was repeated by the credulous crowd until reason stepped in.

op the change in tires should have only helped your acceleration(being they are much smaller diameter), which has me entertaining other variables that could explain your results.

after getting the da for last year when you went to the track and correcting your results to reflect your most recent conditions there is still a rather large disparity we need to logically explain. for those interested his da last year was approximately 560ft below sea level meaning his 14.5 at 98 was about a 14.55 at 97.50mph in similar da that he had this most recent trip.

maybe power/weight ratio was better last year than this year. this could mean your car is heavier now than last year, you make less power now or maybe you make more power now but the car is much heavier.

this problem is still too dynamic to isolate any couple variables, let alone one, that may have attributed to the less than expected results for a 2600lb car w/driver and 210whp. do you have any videos from the runs?

NAH2B

^^WOW you on the wrong forum buddy LOL

lohatch

this is the dumbest **** i have ever seen. go to the track and spin off the line. your ET will suck dick and your wheel speed will be up. it will show at the end of the track.
get the car to hook and the ET will improve even with a lower MPH. run that through your frontal lobe.

Cimburke23

yes, but not when you are making more power.